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- Gamma-ray burst (12)
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- Dust (5)
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- Cosmology (2)
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- BL Lacertae objects (1)
- Brazil (1)
- Circumstellar matter (1)
- Conformal collineations (1)
- Covid-19 pandemic (1)
- Data science (1)
- Deep learning (1)
- GRB 080413B (1)
- GRB 080928 (1)
- GRB 081029 (1)
- GRB 090323 (1)
- GRB 090426 (1)
- GRB 091127 (1)
Articles 1 - 30 of 32
Full-Text Articles in Physical Sciences and Mathematics
Lstm-Sdm: An Integrated Framework Of Lstm Implementation For Sequential Data Modeling[Formula Presented], Hum Nath Bhandari, Binod Rimal, Nawa Raj Pokhrel, Ramchandra Rimal, Keshab R. Dahal
Lstm-Sdm: An Integrated Framework Of Lstm Implementation For Sequential Data Modeling[Formula Presented], Hum Nath Bhandari, Binod Rimal, Nawa Raj Pokhrel, Ramchandra Rimal, Keshab R. Dahal
Arts & Sciences Faculty Publications
LSTM-SDM is a python-based integrated computational framework built on the top of Tensorflow/Keras and written in the Jupyter notebook. It provides several object-oriented functionalities for implementing single layer and multilayer LSTM models for sequential data modeling and time series forecasting. Multiple subroutines are blended to create a conducive user-friendly environment that facilitates data exploration and visualization, normalization and input preparation, hyperparameter tuning, performance evaluations, visualization of results, and statistical analysis. We utilized the LSTM-SDM framework in predicting the stock market index and observed impressive results. The framework can be generalized to solve several other real-world time series problems.
Conformal Symmetries Of The Energy–Momentum Tensor Of Spherically Symmetric Static Spacetimes, Ugur Camci, Khalid Saifullah
Conformal Symmetries Of The Energy–Momentum Tensor Of Spherically Symmetric Static Spacetimes, Ugur Camci, Khalid Saifullah
Arts & Sciences Faculty Publications
Conformal matter collineations of the energy–momentum tensor of a general spherically symmetric static spacetime are studied. The general form of these collineations is found when the energy–momentum tensor is non-degenerate, and the maximum number of independent conformal matter collineations is 15. In the degenerate case of the energy–momentum tensor, it is found that these collineations have infinite degrees of freedom. In some subcases of degenerate energy– momentum, the Ricci tensor is non-degenerate, that is, there exist non-degenerate Ricci inheritance collineations.
Physical Significance Of Noether Symmetries, Asghar Qadir, Ugur Camci
Physical Significance Of Noether Symmetries, Asghar Qadir, Ugur Camci
Arts & Sciences Faculty Publications
In this paper, we will trace the development of the use of symmetry in discussing the theory of motion initiated by Emmy Noether in 1918. Though it started with its use in classical mechanics, and has been heavily used in engineering applications of mechanics, it came into its own in relativity, and quantum theory and their applications in particle physics and field theory. It will be beyond the scope of this article to explain the quantum field theory applications in any detail, but the base for understanding it will be provided here. We will also go on to discuss an …
Covid-19 Pandemic Analysis By The Volterra Integral Equation Models: A Preliminary Study Of Brazil, Italy, And South Africa, Yajni Warnapala, Emma Dehetre, Kate Gilbert
Covid-19 Pandemic Analysis By The Volterra Integral Equation Models: A Preliminary Study Of Brazil, Italy, And South Africa, Yajni Warnapala, Emma Dehetre, Kate Gilbert
Arts & Sciences Faculty Publications
The COVID-19 pandemic has affected many people throughout the world. The objective of this research project was to find numerical solutions through the Gaussian Quadrature Method for the Volterra Integral Equation Model. The non-homogenous Volterra Integral Equation of the second kind is used to capture a broader range of disease distributions. Volterra Integral equation models are used in the context of applied mathematics, public health, and evolutionary biology. The mathematical models of this integral equation gave valid convergence results for the COVID-19 data for 3 countries Italy, South Africa and Brazil. The modeling of these countries was done using the …
Illuminating The Darkest Gamma-Ray Bursts With Radio Observations, B.A. Zauderer, E. Berger, R. Margutti, A.J. Levan, F. Olivares E., D.A. Perley, W. Fong, A. Horesh, Adria Updike, J. Greiner, N.R. Tanvir, T. Laskar, R. Chornock, A.M. Soderberg, K.M. Menten, E. Nakar, J. Carpenter, P. Chandra, A.J. Castro-Tirado, M. Bremer, J. Gorosabel, S. Guziy, D. P´Erez-Ram´Irez, J.M. Winters
Illuminating The Darkest Gamma-Ray Bursts With Radio Observations, B.A. Zauderer, E. Berger, R. Margutti, A.J. Levan, F. Olivares E., D.A. Perley, W. Fong, A. Horesh, Adria Updike, J. Greiner, N.R. Tanvir, T. Laskar, R. Chornock, A.M. Soderberg, K.M. Menten, E. Nakar, J. Carpenter, P. Chandra, A.J. Castro-Tirado, M. Bremer, J. Gorosabel, S. Guziy, D. P´Erez-Ram´Irez, J.M. Winters
Arts & Sciences Faculty Publications
No abstract provided.
The Unusual Afterglow Of The Gamma-Ray Burst 100621a, J. Greiner, T. Krühler, M. Nardini, R. Filgas, A. Moin, C. De Breuck, F. Montenegro-Montes, A. Lundgren, S. Klose, P.M.J. Fonso, F. Bertoldi, J. Elliott, D.A. Kann, F. Knust, K. Menten, A. Nicuesa Guelbenzu, F. Olivares E., A. Rau, A. Rossi, P. Schady, S. Schmidl, G. Siringo, L. Spezzi, V. Sudilovsky, S.J. Tingay, Adria Updike, Z. Wang, A. Weiss, M. Wieringa, F. Wyrowski
The Unusual Afterglow Of The Gamma-Ray Burst 100621a, J. Greiner, T. Krühler, M. Nardini, R. Filgas, A. Moin, C. De Breuck, F. Montenegro-Montes, A. Lundgren, S. Klose, P.M.J. Fonso, F. Bertoldi, J. Elliott, D.A. Kann, F. Knust, K. Menten, A. Nicuesa Guelbenzu, F. Olivares E., A. Rau, A. Rossi, P. Schady, S. Schmidl, G. Siringo, L. Spezzi, V. Sudilovsky, S.J. Tingay, Adria Updike, Z. Wang, A. Weiss, M. Wieringa, F. Wyrowski
Arts & Sciences Faculty Publications
Aims. With the afterglow of GRB 100621A being the brightest detected so far in X-rays, and superb GROND coverage in the optical/near-infrared during the first few hours, an observational verification of basic fireball predictions seemed possible. Methods. In order to constrain the broad-band spectral energy distribution of the afterglow of GRB 100621A, dedicated observations were performed in the optical/near-infrared with the 7-channel Gamma-Ray Burst Optical and Near-infrared Detector (GROND) at the 2.2mMPG/ESO telescope, in the sub-millimeter band with the large bolometer array LABOCA at APEX, and at radio frequencies with ATCA. Utilizing also Swift X-ray observations, we attempt an interpretation …
Grb 091024a And The Nature Of Ultra-Long Gamma-Ray Bursts, F.J. Virgili, C.G. Mundell, V. Pal’Shin, C. Guidorzi, R. Margutti, A. Melandri, R. Harrison, S. Kobayashi, R. Chornock, A. Henden, Adria Updike, S.B. Cenko, N.R. Tanvir, I.A. Steele, A. Cucchiara, A. Gomboc, A. Levan, Z. Cano, C.J. Mottram, N.R. Clay, D. Bersier, D. KopaˇC, J. Japelj, A.V. Filippenko, W. Li, D. Svinkin, S. Golenetskii, D.H. Hartmann, P.A. Milne, G. Williams, P.T. O’Brien, D.B. Fox, E. Berger
Grb 091024a And The Nature Of Ultra-Long Gamma-Ray Bursts, F.J. Virgili, C.G. Mundell, V. Pal’Shin, C. Guidorzi, R. Margutti, A. Melandri, R. Harrison, S. Kobayashi, R. Chornock, A. Henden, Adria Updike, S.B. Cenko, N.R. Tanvir, I.A. Steele, A. Cucchiara, A. Gomboc, A. Levan, Z. Cano, C.J. Mottram, N.R. Clay, D. Bersier, D. KopaˇC, J. Japelj, A.V. Filippenko, W. Li, D. Svinkin, S. Golenetskii, D.H. Hartmann, P.A. Milne, G. Williams, P.T. O’Brien, D.B. Fox, E. Berger
Arts & Sciences Faculty Publications
We present a broadband study of gamma-ray burst (GRB) 091024A within the context of other ultra-long-duration GRBs. An unusually long burst detected by Konus–Wind (KW), Swift, and Fermi, GRB 091024A has prompt emission episodes covering ∼1300 s, accompanied by bright and highly structured optical emission captured by various rapid-response facilities, including the 2 m autonomous robotic Faulkes North and Liverpool Telescopes, KAIT, S-LOTIS, and the Sonoita Research Observatory.We also observed the burst with 8 and 10mclass telescopes and determine the redshift to be z = 1.0924 ± 0.0004. We find no correlation between the …
The Fast Evolution Of Sn 2010bh Associated With Xrf 100316d, F. Olivares E., J. Greiner, P. Schady, A. Rau, S. Klose, T. Krühler, P.M.J. Afonso, Adria Updike, M. Nardini, R. Filgas, A. Nicuesa Guelbenzu, C. Clemens, J. Elliott, D.A. Kann, A. Rossi, V. Sudilovsky
The Fast Evolution Of Sn 2010bh Associated With Xrf 100316d, F. Olivares E., J. Greiner, P. Schady, A. Rau, S. Klose, T. Krühler, P.M.J. Afonso, Adria Updike, M. Nardini, R. Filgas, A. Nicuesa Guelbenzu, C. Clemens, J. Elliott, D.A. Kann, A. Rossi, V. Sudilovsky
Arts & Sciences Faculty Publications
No abstract provided.
A Deep Search For The Host Galaxies Of Gamma-Ray Bursts With No Detected Optical Afterglow, A. Rossi, S. Klose, P. Ferrero, J. Greiner, L.A. Arnold, E. Gonsalves, D.H. Hartmann, Adria Updike, D.A. Kann, T. Krühler, E. Palazzi, S. Savaglio, S. Schulze, P.M.J. Afonso, L. Amati, A.J. Castro-Tirado, C. Clemens, R. Filgas, J. Gorosabel, L.K. Hunt, A. Küpcü Yoldas, N. Masetti, M. Nardini, A. Nicuesa Guelbenzu, F.E. Olivares, E. Pian, A. Rau, P. Schady, S. Schmidl, A. Yoldas, A. De Ugarte Postigo
A Deep Search For The Host Galaxies Of Gamma-Ray Bursts With No Detected Optical Afterglow, A. Rossi, S. Klose, P. Ferrero, J. Greiner, L.A. Arnold, E. Gonsalves, D.H. Hartmann, Adria Updike, D.A. Kann, T. Krühler, E. Palazzi, S. Savaglio, S. Schulze, P.M.J. Afonso, L. Amati, A.J. Castro-Tirado, C. Clemens, R. Filgas, J. Gorosabel, L.K. Hunt, A. Küpcü Yoldas, N. Masetti, M. Nardini, A. Nicuesa Guelbenzu, F.E. Olivares, E. Pian, A. Rau, P. Schady, S. Schmidl, A. Yoldas, A. De Ugarte Postigo
Arts & Sciences Faculty Publications
No abstract provided.
Bl Lacertae Objects Beyond Redshift 1.3 – Uv-To-Nir Photometry And Photometric Redshift For Fermi/Lat Blazars, A. Rau, P. Schady, J. Greiner, M. Salvato, M. Ajello, E. Bottacini, N. Gehrels, P.M.J. Afonso, J. Elliott, R. Filgas, D.A. Kann, S. Klose, T. Krühler, M. Nardini, A. Nicuesa Guelbenzu, F. Olivares E., A. Rossi, V. Sudilovsky, Adria Updike, D.H. Hartmann
Bl Lacertae Objects Beyond Redshift 1.3 – Uv-To-Nir Photometry And Photometric Redshift For Fermi/Lat Blazars, A. Rau, P. Schady, J. Greiner, M. Salvato, M. Ajello, E. Bottacini, N. Gehrels, P.M.J. Afonso, J. Elliott, R. Filgas, D.A. Kann, S. Klose, T. Krühler, M. Nardini, A. Nicuesa Guelbenzu, F. Olivares E., A. Rossi, V. Sudilovsky, Adria Updike, D.H. Hartmann
Arts & Sciences Faculty Publications
Context. Observations of the γ-ray sky with Fermi led to significant advances towards understanding blazars, the most extreme class of active galactic nuclei. A large fraction of the population detected by Fermi is formed by BL Lacertae (BL Lac) objects, whose sample has always suffered from a severe redshift incompleteness due to the quasi-featureless optical spectra. Aims. Our goal is to provide a significant increase of the number of confirmed high-redshift BL Lac objects contained in the 2 LAC Fermi/LAT cataloge.Methods. For 103 Fermi/LAT blazars, photometric redshifts using spectral energy distribution fitting have been obtained.The photometry includes 13 broad-band filters …
Supersolar Metal Abundances In Two Galaxies At Z ∼ 3.57 Revealed By The Grb 090323 Afterglow Spectrum, S. Savaglio, A. Rau, J. Greiner, T. Kruhler, S. Mcbreen, D.H. Hartmann, Adria Updike, R. Filgas, S. Klose, P. Afonso, C. Clemens, A. Kupcu Yoldas, F. Olivares E., V. Sudilovsky, G. Szokoly
Supersolar Metal Abundances In Two Galaxies At Z ∼ 3.57 Revealed By The Grb 090323 Afterglow Spectrum, S. Savaglio, A. Rau, J. Greiner, T. Kruhler, S. Mcbreen, D.H. Hartmann, Adria Updike, R. Filgas, S. Klose, P. Afonso, C. Clemens, A. Kupcu Yoldas, F. Olivares E., V. Sudilovsky, G. Szokoly
Arts & Sciences Faculty Publications
No abstract provided.
The Late-Time Afterglow Of The Extremely Energetic Short Burst Grb 090510 Revisited, A. Nicuesa Guelbenzu, S. Klose, T. Krühler, J. Greiner, A. Rossi, D.A. Kann, F. Olivares, A. Rau, P.M.J. Afonso, J. Elliott, R. Filgas, A. Küpcü Yoldas, S. Mcbreen, M. Nardini, P. Schady, S. Schmidl, V. Sudilovsky, Adria Updike, A. Yoldas
The Late-Time Afterglow Of The Extremely Energetic Short Burst Grb 090510 Revisited, A. Nicuesa Guelbenzu, S. Klose, T. Krühler, J. Greiner, A. Rossi, D.A. Kann, F. Olivares, A. Rau, P.M.J. Afonso, J. Elliott, R. Filgas, A. Küpcü Yoldas, S. Mcbreen, M. Nardini, P. Schady, S. Schmidl, V. Sudilovsky, Adria Updike, A. Yoldas
Arts & Sciences Faculty Publications
No abstract provided.
Multi-Color Observations Of Short Grb Afterglows: 20 Events Observed Between 2007 And 2010, A. Nicuesa Guelbenzu, S. Klose, J. Greiner, D.A. Kann, T. Krühler, A. Rossi, S. Schulze, P.M.J. Afonso, J. Elliott, R. Filgas, D.H. Hartmann, A. Küpcü Yoldas, S. Mcbreen, M. Nardini, F. Olivares E., A. Rau, S. Schmidl, P. Schady, V. Sudilovsky, Adria Updike, A. Yoldas
Multi-Color Observations Of Short Grb Afterglows: 20 Events Observed Between 2007 And 2010, A. Nicuesa Guelbenzu, S. Klose, J. Greiner, D.A. Kann, T. Krühler, A. Rossi, S. Schulze, P.M.J. Afonso, J. Elliott, R. Filgas, D.H. Hartmann, A. Küpcü Yoldas, S. Mcbreen, M. Nardini, F. Olivares E., A. Rau, S. Schmidl, P. Schady, V. Sudilovsky, Adria Updike, A. Yoldas
Arts & Sciences Faculty Publications
No abstract provided.
Grb071028b, A Burst Behind Large Amounts Of Dust In An Unabsorbed Galaxy, C. Clemens, J. Greiner, T. Krühler, D. Pierini, S. Savaglio, S. Klose, P.M.J. Afonso, R. Filgas, F.E. Olivares, A. Rau, P. Schady, A. Rossi, A. Küpcü Yoldas, Adria Updike, A. Yoldas
Grb071028b, A Burst Behind Large Amounts Of Dust In An Unabsorbed Galaxy, C. Clemens, J. Greiner, T. Krühler, D. Pierini, S. Savaglio, S. Klose, P.M.J. Afonso, R. Filgas, F.E. Olivares, A. Rau, P. Schady, A. Rossi, A. Küpcü Yoldas, Adria Updike, A. Yoldas
Arts & Sciences Faculty Publications
No abstract provided.
Spitzer 24Μm Survey For Dust Disks Around Hot White Dwarfs, You-Hua Chu, Kate Y.L. Su, Jana Bilikova, Robert A. Gruendl, Orsola De Marco, Martin A. Guerrero, Adria Updike, Kevin Volk, Thomas Rauch
Spitzer 24Μm Survey For Dust Disks Around Hot White Dwarfs, You-Hua Chu, Kate Y.L. Su, Jana Bilikova, Robert A. Gruendl, Orsola De Marco, Martin A. Guerrero, Adria Updike, Kevin Volk, Thomas Rauch
Arts & Sciences Faculty Publications
No abstract provided.
Monster In The Dark: The Ultraluminous Grb 080607 And Its Dusty Environment, D.A. Perley, A.N. Morgan, Adria Updike, F. Yuan, C.W. Akerlof, A.A. Miller, J.S. Bloom, S.B. Cenko, W. Li, A.V. Filippenko, J.X. Prochaska, D.A. Kann, N.R. Tanvir, A.J. Levan, N.R. Butler, P. Christian, D.H. Hartmann, P. Milne, E.S. Rykoff, W. Rujopakarn, J.C. Wheeler, G.G. Williams
Monster In The Dark: The Ultraluminous Grb 080607 And Its Dusty Environment, D.A. Perley, A.N. Morgan, Adria Updike, F. Yuan, C.W. Akerlof, A.A. Miller, J.S. Bloom, S.B. Cenko, W. Li, A.V. Filippenko, J.X. Prochaska, D.A. Kann, N.R. Tanvir, A.J. Levan, N.R. Butler, P. Christian, D.H. Hartmann, P. Milne, E.S. Rykoff, W. Rujopakarn, J.C. Wheeler, G.G. Williams
Arts & Sciences Faculty Publications
We present early-time optical through infrared photometry of the bright Swift gamma-ray burst (GRB) 080607, starting only 6 s following the initial trigger in the rest frame. Complemented by our previously published spectroscopy, this high-quality photometric data set allows us to solve for the extinction properties of the redshift 3.036 sightline, giving perhaps the most detailed information to date on the ultraviolet continuum absorption properties of any sightline outside our Local Group. The extinction properties are not adequately modeled by any ordinary extinction template (including the average Milky Way, Large Magellanic Cloud, and Small Magellanic Cloud curves), partially because the …
Grb 090426: Discovery Of A Jet Break In A Short Burst Afterglow, A. Nicuesa Guelbenzu, S. Klose, A. Rossi, D.A. Kann, T. Krühler, J. Greiner, A. Rau, F. Olivares E., P.M.J. Afonso, R. Filgas, A. Küpcü Yoldas, S. Mcbreen, M. Nardini, P. Schady, S. Schmidl, Adria Updike, A. Yoldas
Grb 090426: Discovery Of A Jet Break In A Short Burst Afterglow, A. Nicuesa Guelbenzu, S. Klose, A. Rossi, D.A. Kann, T. Krühler, J. Greiner, A. Rau, F. Olivares E., P.M.J. Afonso, R. Filgas, A. Küpcü Yoldas, S. Mcbreen, M. Nardini, P. Schady, S. Schmidl, Adria Updike, A. Yoldas
Arts & Sciences Faculty Publications
Context. The link between the duration of GRBs and the nature of their progenitors remains disputed. Short bursts (with durations of less than ∼2 s) are less frequently observed, technically more difficult to localize, and exhibit significantly fainter afterglows. Aims. It is of critical importance to establish whether the burst duration can reliably distinguish the different GRB population models of collapsars and compact stellar mergers. The Swift GRB 090426 provides an unique opportunity to address this question. Its duration (T90 = 1.28 s) places GRB 090426 firmly in the short burst population, while the high redshift (z = 2.609), host …
Grb 091127: The Cooling Break Race On Magnetic Fuel, R. Filgas, J. Greiner, P. Schady, T. Krühler, Adria Updike, S. Klose, M. Nardini, D.A. Kann, A. Rossi, V. Sudilovsky, P.M.J. Afonso, C. Clemens, J. Elliott, A. Nicuesa Guelbenzu, F. Olivares E., A. Rau
Grb 091127: The Cooling Break Race On Magnetic Fuel, R. Filgas, J. Greiner, P. Schady, T. Krühler, Adria Updike, S. Klose, M. Nardini, D.A. Kann, A. Rossi, V. Sudilovsky, P.M.J. Afonso, C. Clemens, J. Elliott, A. Nicuesa Guelbenzu, F. Olivares E., A. Rau
Arts & Sciences Faculty Publications
No abstract provided.
On The Nature Of The Extremely Fast Optical Rebrightening Of The Afterglow Of Grb 081029, M. Nardini, J. Greiner, T. Krühler, R. Filgas, S. Klose, P. Afonso, C. Clemens, A. N. Guelbenzu, F. Olivares E., A. Rau, A. Rossi, Adria Updike, A. Küpcü Yoldas, A. Yoldas, D. Burlon, J. Elliott, D. A. Kann
On The Nature Of The Extremely Fast Optical Rebrightening Of The Afterglow Of Grb 081029, M. Nardini, J. Greiner, T. Krühler, R. Filgas, S. Klose, P. Afonso, C. Clemens, A. N. Guelbenzu, F. Olivares E., A. Rau, A. Rossi, Adria Updike, A. Küpcü Yoldas, A. Yoldas, D. Burlon, J. Elliott, D. A. Kann
Arts & Sciences Faculty Publications
Context. After the launch of the Swift satellite, the gamma-ray burst (GRB) optical light-curve smoothness paradigm has been questioned thanks to the faster and better sampled optical follow-up, which has unveiled a very complex behaviour. This complexity is triggering the interest of the whole GRB community. The GROND multi-channel imager is used to study optical and near-infrared (NIR) afterglows of GRBs with unprecedented optical and near-infrared temporal and spectral resolution. The GRB 081029 has a very prominent optical rebrightening event and is an outstanding example of the application of the multi-channel imager to GRB afterglows. Aims. Here we exploit the …
Photometric Redshifts For Gamma-Ray Burst Afterglows From Grond And Swift/Uvot, T. Krühler, P. Schady, J. Greiner, P. Afonso, E. Bottacini, C. Clemens, R. Filgas, S. Klose, T. S. Koch, A. Küpcü-Yoldas, S. R. Oates, F. Olivares E., M. J. Page, S. Mcbreen, M. Nardini, A. Nicuesa Guelbenzu, A. Rau, P. W.A. Roming, A. Rossi, Adria Updike, A. Yoldas
Photometric Redshifts For Gamma-Ray Burst Afterglows From Grond And Swift/Uvot, T. Krühler, P. Schady, J. Greiner, P. Afonso, E. Bottacini, C. Clemens, R. Filgas, S. Klose, T. S. Koch, A. Küpcü-Yoldas, S. R. Oates, F. Olivares E., M. J. Page, S. Mcbreen, M. Nardini, A. Nicuesa Guelbenzu, A. Rau, P. W.A. Roming, A. Rossi, Adria Updike, A. Yoldas
Arts & Sciences Faculty Publications
No abstract provided.
The Nature Of “Dark” Gamma-Ray Bursts, J. Greiner, T. Krühler, S. Klose, P. Afonso, C. Clemens, R. Filgas, D. H. Hartmann, A. Küpcü Yoldas, M. Nardini, F. Olivares E., A. Rau, A. Rossi, P. Schady, Adria Updike
The Nature Of “Dark” Gamma-Ray Bursts, J. Greiner, T. Krühler, S. Klose, P. Afonso, C. Clemens, R. Filgas, D. H. Hartmann, A. Küpcü Yoldas, M. Nardini, F. Olivares E., A. Rau, A. Rossi, P. Schady, Adria Updike
Arts & Sciences Faculty Publications
Context. Thirteen years after the discovery of the first afterglows, the nature of dark gamma-ray bursts (GRB) still eludes explanation: while each long-duration GRB typically has an X-ray afterglow, optical/NIR emission is only seen for 40–60% of them. Aims. Here we use the afterglow detection statistics of the systematic follow-up observations performed with GROND since mid-2007 in order to derive the fraction of “dark bursts” according to different methods, and to distinguish between various scenarios for “dark bursts”. Methods. Observations were performed with the 7-channel “Gamma-Ray Optical and Near-infrared Detector” (GROND) at the 2.2 m MPI/ESO telescope. We used the …
The Seds And Host Galaxies Of The Dustiest Grb Afterglows, T. Krühler, J. Greiner, P. Schady, S. Savaglio, P. M.J. Afonso, C. Clemens, J. Elliott, R. Filgas, D. Gruber, D. A. Kann, S. Klose, A. Küpcü-Yoldas, S. Mcbreen, F. Olivares, D. Pierini, A. Rau, A. Rossi, M. Nardini, A. Nicuesa Guelbenzu, V. Sudilovsky, Adria Updike
The Seds And Host Galaxies Of The Dustiest Grb Afterglows, T. Krühler, J. Greiner, P. Schady, S. Savaglio, P. M.J. Afonso, C. Clemens, J. Elliott, R. Filgas, D. Gruber, D. A. Kann, S. Klose, A. Küpcü-Yoldas, S. Mcbreen, F. Olivares, D. Pierini, A. Rau, A. Rossi, M. Nardini, A. Nicuesa Guelbenzu, V. Sudilovsky, Adria Updike
Arts & Sciences Faculty Publications
No abstract provided.
The Swift/Fermi Grb 080928 From 1 Ev To 150 Kev, A. Rossi, S. Schulze, S. Klose, D. A. Kann, A. Rau, H. A. Krimm, G. Jóhannesson, A. Panaitescu, F. Yuan, P. Ferrero, T. Krühler, J. Greiner, P. Schady, S. B. Pandey, L. Amati, P. M.J. Afonso, C. W. Akerlof, L. A. Arnold, C. Clemens, R. Filgas, D. H. Hartmann, A. Küpcü Yoldas, S. Mcbreen, T. A. Mckay, A. Nicuesa Guelbenzu, F. E. Olivares, B. Paciesas, E. S. Rykoff, G. Szokoly, Adria Updike, A. Yoldas
The Swift/Fermi Grb 080928 From 1 Ev To 150 Kev, A. Rossi, S. Schulze, S. Klose, D. A. Kann, A. Rau, H. A. Krimm, G. Jóhannesson, A. Panaitescu, F. Yuan, P. Ferrero, T. Krühler, J. Greiner, P. Schady, S. B. Pandey, L. Amati, P. M.J. Afonso, C. W. Akerlof, L. A. Arnold, C. Clemens, R. Filgas, D. H. Hartmann, A. Küpcü Yoldas, S. Mcbreen, T. A. Mckay, A. Nicuesa Guelbenzu, F. E. Olivares, B. Paciesas, E. S. Rykoff, G. Szokoly, Adria Updike, A. Yoldas
Arts & Sciences Faculty Publications
We present the results of a comprehensive study of the gamma-ray burst 080928 and of its afterglow. GRB 080928 was a long burst detected by Swift/BAT and Fermi/GBM. It is one of the exceptional cases where optical emission had already been detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 s simultaneous optical, X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. In particular, we show that the SED during the main prompt emission phase agrees with synchrotron radiation.We constructed …
The Two-Component Jet Of Grb 080413b, R. Filgas, T. Krühler, J. Greiner, A. Rau, E. Palazzi, S. Klose, P. Schady, A. Rossi, P. M.J. Afonso, L. A. Antonelli, C. Clemens, S. Covino, P. D’Avanzo, A. Küpcü Yoldas, M. Nardini, A. Nicuesa Guelbenzu, F. Olivares, Adria Updike, A. Yoldas
The Two-Component Jet Of Grb 080413b, R. Filgas, T. Krühler, J. Greiner, A. Rau, E. Palazzi, S. Klose, P. Schady, A. Rossi, P. M.J. Afonso, L. A. Antonelli, C. Clemens, S. Covino, P. D’Avanzo, A. Küpcü Yoldas, M. Nardini, A. Nicuesa Guelbenzu, F. Olivares, Adria Updike, A. Yoldas
Arts & Sciences Faculty Publications
Aims. The quick and precise localization of GRBs by the Swift telescope allows the early evolution of the afterglow light curve to be captured by ground-based telescopes. With GROND measurements we can investigate the optical/near-infrared light curve of the afterglow of gamma-ray burst 080413B in the context of late rebrightening. Methods. Multi-wavelength follow-up observations were performed on the afterglow of GRB 080413B. X-ray emission was detected by the X-ray telescope onboard the Swift satellite and obtained from the public archive. Optical and near-infrared photometry was performed with the seven-channel imager GROND mounted at the MPG/ESO 2.2 m telescope and additionally …
A Very Metal-Poor Damped Lyman-Α System Revealed Through The Most Energetic Grb 090926a, A. Rau, S. Savaglio, T. Kr¨ Uhler, P. Afonso, J. Greiner, S. Klose, P. Schady, S. Mcbreen, R. Filgas, F. Olivares E., A. Rossi, Adria Updike
A Very Metal-Poor Damped Lyman-Α System Revealed Through The Most Energetic Grb 090926a, A. Rau, S. Savaglio, T. Kr¨ Uhler, P. Afonso, J. Greiner, S. Klose, P. Schady, S. Mcbreen, R. Filgas, F. Olivares E., A. Rossi, Adria Updike
Arts & Sciences Faculty Publications
No abstract provided.
The Afterglows Of Swift-Era Gamma-Ray Bursts. I. Comparing Pre-Swift And Swift-Era Long/Soft (Type Ii) Grb Optical Afterglows, D. A. Kann, S. Klose, B. Zhang, D. Malesani, E. Nakar, A. Pozanenko, A. C. Wilson, N. R. Butler, P. Jakobsson, S. Schulze, M. Andreev, L. A. Antonelli, I. F. Bikmaev, V. Biryukov, M. B¨Ottcher, R. A. Burenin, J. M. Castro Cer´On, A. J. Castro-Tirado, G. Chincarini, B. E. Cobb, S. Covino, P. D’Avanzo, V. D’Elia, M. Della Valle, A. De Ugarte Postigo, Yu Efimov, P. Ferrero, D. Fugazza, D. Fugazza, J. P.U. Fynbo, M. Gålfalk, F. Grundahl, J. Gorosabel, S. Gupta, S. Guziy, B. Hafizov, J. Hjorth, K. Holhjem, M. Ibrahimov, M. Im, G. L. Israel, M. Je´Linek, B. L. Jensen, R. Karimov, I. M. Khamitov, U. KizilogˇLu, E. Klunko, P. Kuba´Nek, A. S. Kutyrev, P. Laursen, A. J. Levan, F. Mannucci, C. M. Martin, A. Mescheryakov, N. Mirabal, J. P. Norris, J. -E. Ovaldsen, D. Paraficz, E. Pavlenko, S. Piranomonte, A. Rossi, V. Rumyantsev, R. Salinas, A. Sergeev, D. Sharapov, J. Sollerman, B. Stecklum, L. Stella, G. Tagliaferri, N. R. Tanvir, J. Telting, V. Testa, Adria Updike, A. Volnova, D. Watson, K. Wiersema, D. Xu
The Afterglows Of Swift-Era Gamma-Ray Bursts. I. Comparing Pre-Swift And Swift-Era Long/Soft (Type Ii) Grb Optical Afterglows, D. A. Kann, S. Klose, B. Zhang, D. Malesani, E. Nakar, A. Pozanenko, A. C. Wilson, N. R. Butler, P. Jakobsson, S. Schulze, M. Andreev, L. A. Antonelli, I. F. Bikmaev, V. Biryukov, M. B¨Ottcher, R. A. Burenin, J. M. Castro Cer´On, A. J. Castro-Tirado, G. Chincarini, B. E. Cobb, S. Covino, P. D’Avanzo, V. D’Elia, M. Della Valle, A. De Ugarte Postigo, Yu Efimov, P. Ferrero, D. Fugazza, D. Fugazza, J. P.U. Fynbo, M. Gålfalk, F. Grundahl, J. Gorosabel, S. Gupta, S. Guziy, B. Hafizov, J. Hjorth, K. Holhjem, M. Ibrahimov, M. Im, G. L. Israel, M. Je´Linek, B. L. Jensen, R. Karimov, I. M. Khamitov, U. KizilogˇLu, E. Klunko, P. Kuba´Nek, A. S. Kutyrev, P. Laursen, A. J. Levan, F. Mannucci, C. M. Martin, A. Mescheryakov, N. Mirabal, J. P. Norris, J. -E. Ovaldsen, D. Paraficz, E. Pavlenko, S. Piranomonte, A. Rossi, V. Rumyantsev, R. Salinas, A. Sergeev, D. Sharapov, J. Sollerman, B. Stecklum, L. Stella, G. Tagliaferri, N. R. Tanvir, J. Telting, V. Testa, Adria Updike, A. Volnova, D. Watson, K. Wiersema, D. Xu
Arts & Sciences Faculty Publications
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to 2009 September, for a total of 76 GRBs, and present an additional three pre-Swift GRBs not included in an earlier sample. Furthermore, we publish 840 additional new photometry data points on a total of 42 GRB afterglows, including large data sets for GRBs 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A, and 080810. We analyzed the light curves of all GRBs in the sample and derived spectral energy distributions for the sample with the best data quality, allowing …
Evidence For Supernova-Synthesized Dust From The Rising Afterglow Of Grb071025 At Z ∼ 5, Daniel A. Perley, J. S. Bloom, C. R. Klein, S. Covino, T. Minezaki, P. Wo´Zniak, W. T. Vestrand, G. G. Williams, P. Milne, N. R. Butler, Adria Updike, T. Kr¨Uhler, P. Afonso, A. Antonelli, L. Cowie, P. Ferrero, J. Greiner, D. H. Hartmann, Y. Kakazu, A. K¨Upc¨U Yoldas¸, A. N. Morgan, P. A. Price, J. X. Prochaska, Y. Yoshii
Evidence For Supernova-Synthesized Dust From The Rising Afterglow Of Grb071025 At Z ∼ 5, Daniel A. Perley, J. S. Bloom, C. R. Klein, S. Covino, T. Minezaki, P. Wo´Zniak, W. T. Vestrand, G. G. Williams, P. Milne, N. R. Butler, Adria Updike, T. Kr¨Uhler, P. Afonso, A. Antonelli, L. Cowie, P. Ferrero, J. Greiner, D. H. Hartmann, Y. Kakazu, A. K¨Upc¨U Yoldas¸, A. N. Morgan, P. A. Price, J. X. Prochaska, Y. Yoshii
Arts & Sciences Faculty Publications
No abstract provided.
The Bright Optical/Nir Afterglow Of The Faint Grb 080710 – Evidence Of A Jet Viewed Off-Axis, T. Krühler, J. Greiner, P. Afonso, D. Burlon, C. Clemens, R. Filgas, D. A. Kann, S. Klose, A. Küpcü Yolda¸, S. Mcbreen, F. Olivares, A. Rau, A. Rossi, S. Schulze, G. P. Szokoly, Adria Updike, A. Yolda¸S
The Bright Optical/Nir Afterglow Of The Faint Grb 080710 – Evidence Of A Jet Viewed Off-Axis, T. Krühler, J. Greiner, P. Afonso, D. Burlon, C. Clemens, R. Filgas, D. A. Kann, S. Klose, A. Küpcü Yolda¸, S. Mcbreen, F. Olivares, A. Rau, A. Rossi, S. Schulze, G. P. Szokoly, Adria Updike, A. Yolda¸S
Arts & Sciences Faculty Publications
Aims. We investigate the optical/near-infrared light curve of the afterglow of GRB 080710 in the context of rising afterglows. Methods. Optical and near-infrared photometry was performed using the seven-channel imager GROND and the Tautenburg Schmidt telescope. X-ray data were provided by the X-ray Telescope onboard the Swift satellite. We construct an empirical light curve model using the available broadband data, which is well-sampled in the time and frequency domains. Results. The optical/NIR light curve of the afterglow of GRB 080710 is dominated by an initial increase in brightness, which smoothly turns over into a shallow power law decay. At around …
Polarization Of The Sri Lankan Polity: An Analysis Of Presidential Elections (1982 – 2005), Yajni Warnapala, Zufni Yehiya
Polarization Of The Sri Lankan Polity: An Analysis Of Presidential Elections (1982 – 2005), Yajni Warnapala, Zufni Yehiya
Arts & Sciences Faculty Publications
Sri Lanka is a multi-ethnic, multi-religious developing country that has enjoyed continuous universal adult franchise since 1931. Under a new constitution enacted in 1978, Sri Lanka moved to a presidential system of government. Since 1982 five presidential elections were conducted. This paper analyzes voter behavior by looking at all the five presidential elections. This study shows that all the winners of the presidential elections (except in 2005) won them by appealing across racial and religious boundaries with a popular mandate. In 2005, there was a shift; the winner was able to secure victory by promoting a hard-line pro-Sinhala nationalistic platform. …
A Photometric Redshift Of Z = 1.8+0.4 -.3 For The Agile Grb 080514b, A. Rossi, A. De Ugarte Postigo, P. Ferrero, D. A. Kann, S. Klose, S. Schulze, J. Greiner, P. Schady, R. Filgas, E. E. Gonsalves, A. Küpcü Yolda¸S, T. Krühler, G. Szokoly, A. Yolda¸S, P. M.J. Afonso, C. Clemens, J. S. Bloom, D. A. Perley, J. P.U. Fynbo, A. J. Castro-Tirado, J. Gorosabel, P. Kubánek, Adria Updike, D. H. Hartmann, A. Giuliani, S. T. Holland, L. Hanlon, M. Bremer, J. French, G. Melady, D. A. García-Hernández
A Photometric Redshift Of Z = 1.8+0.4 -.3 For The Agile Grb 080514b, A. Rossi, A. De Ugarte Postigo, P. Ferrero, D. A. Kann, S. Klose, S. Schulze, J. Greiner, P. Schady, R. Filgas, E. E. Gonsalves, A. Küpcü Yolda¸S, T. Krühler, G. Szokoly, A. Yolda¸S, P. M.J. Afonso, C. Clemens, J. S. Bloom, D. A. Perley, J. P.U. Fynbo, A. J. Castro-Tirado, J. Gorosabel, P. Kubánek, Adria Updike, D. H. Hartmann, A. Giuliani, S. T. Holland, L. Hanlon, M. Bremer, J. French, G. Melady, D. A. García-Hernández
Arts & Sciences Faculty Publications
The AGILE gamma-ray burst GRB 080514B is the first detected to have emission above 30 MeV and an optical afterglow. However, no spectroscopic redshift for this burst is known.We report on our ground-based optical/NIR and millimeter follow-up observations of this event at several observatories, including the multi-channel imager GROND on La Silla, supplemented by Swift UVOT and Swift XRT data. The spectral energy distribution (SED) of the optical/NIR afterglow is found to decline sharply bluewards to the UV bands, which can be utilized in estimating the redshift. Fitting the SED from the Swift UVOT uvw2 band to the H band, …