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Articles 151 - 159 of 159
Full-Text Articles in Physical Sciences and Mathematics
An Overview Of First Results From Comptel, V. Schonfelder, H Aarts, K Bennett, H Bloemen, H Deboer, M Busetta, W Collmar, A Connors, R Diehl, J W. Den Herder, W Hermsen, L Kuiper, G G. Lichti, J Lockwood, John R. Macri, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, G. Simpson, J G. Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, W Webber, C Winkler
An Overview Of First Results From Comptel, V. Schonfelder, H Aarts, K Bennett, H Bloemen, H Deboer, M Busetta, W Collmar, A Connors, R Diehl, J W. Den Herder, W Hermsen, L Kuiper, G G. Lichti, J Lockwood, John R. Macri, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, G. Simpson, J G. Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, W Webber, C Winkler
Space Science Center
COMPTEL is the first imaging telescope to explore the MeV gamma-ray range (0.7 to 30 MeV). At present, it is performing a complete sky survey. Targets of special interest in the COMPTEL energy range are radio pulsars, X-ray binaries, novae, supernovae, supernova remnants, mulecular clouds, the interstellar medium within the Milky Way, active galactic nuclei, and the diffuse cosmic background radiation. The data from the first half year of the mission have demonstrated that COMPTEL performs as expected. The Crab is clearly seen at its proper position in the first images of the anticenter region of the galaxy. The Crab …
Gamma‐Ray Burst Studies By Comptel During Its First Year Of Operation, C Winkler, K Bennett, L O. Hanlon, O R. Williams, W Collmar, R Diehl, V Schonfelder, H Steinle, M Varendorff, J W. Den Herder, W Hermsen, L Kuiper, B Swanenburg, C De Vries, A Connors, D J. Forrest, R M. Kippen, Mark L. Mcconnell, James M. Ryan
Gamma‐Ray Burst Studies By Comptel During Its First Year Of Operation, C Winkler, K Bennett, L O. Hanlon, O R. Williams, W Collmar, R Diehl, V Schonfelder, H Steinle, M Varendorff, J W. Den Herder, W Hermsen, L Kuiper, B Swanenburg, C De Vries, A Connors, D J. Forrest, R M. Kippen, Mark L. Mcconnell, James M. Ryan
Space Science Center
During the first year of Compton GRO operations, more than 20 cosmic gamma‐ray burst‐detected by the BATSE instrument ‐ occurred inside the 1 sr field of view of the imaging gamma‐ray telescope COMPTEL. Using COMPTEL’s primary mode of operation (the telescope mode) direct images (with ∼1° GRB location accuracy) and event spectra (0.7 MeV – 30 MeV) with spectral resolution better than 10% FWHM have been obtained. In its secondary mode of burst operations, COMPTEL has recorded time resolved spectra (0.1 MeV – 10 MeV) from its large NaI detectors. This paper summarises the results on cosmic GRB sources obtained …
The Design Of A Gamma‐Ray Burst Polarimeter, Mark L. Mcconnell, D J. Forrest, K Levenson, W T. Vestrand
The Design Of A Gamma‐Ray Burst Polarimeter, Mark L. Mcconnell, D J. Forrest, K Levenson, W T. Vestrand
Space Science Center
The study of the polarization properties of the gamma‐ray bursts is the one remaining unexplored avenue of research which may help to answer some of the fundamental problems regarding the nature of these mysterious objects. We have designed an instrument to measure linear polarization in cosmic gamma‐ray bursts at energies ≳50 keV. Here we describe the design of this instrument, which we call the Gamma‐ray Burst Polarimeter Experiment (GRAPE).
Comptel Observations Of The Inner Galaxy, H Bloemen, H Deboer, R Van Dijk, J W. Den Herder, W Hermsen, L Kuiper, B Swanenburg, C De Vries, W Collmar, R Diehl, G G. Lichti, V Schonfelder, H Steinle, A W. Strong, Mark L. Mcconnell, A Connors, D Morris, G Stacy, K Bennett
Comptel Observations Of The Inner Galaxy, H Bloemen, H Deboer, R Van Dijk, J W. Den Herder, W Hermsen, L Kuiper, B Swanenburg, C De Vries, W Collmar, R Diehl, G G. Lichti, V Schonfelder, H Steinle, A W. Strong, Mark L. Mcconnell, A Connors, D Morris, G Stacy, K Bennett
Space Science Center
This paper presents a first global study of COMPTEL observations of the inner Galaxy in the energy range 0.75–10 MeV. Preliminary findings demonstrate COMPTEL’s capabilities for mapping the observed gamma radiation and disentangling the contributions from point sources and diffuse emission.
Initial Results From Comptel—An Overview, V Schonfelder, W Collmar, R Diehl, G G. Lichti, H Steinle, A W. Strong, M Varendorff, H Bloemen, H Deboer, R Vandijk, J W. Den Herder, W Hermsen, L Kuiper, B Swanenburg, C De Vries, A Connors, D J. Forrest, Mark L. Mcconnell, D Morris, James M. Ryan, G Stacy, K Bennett, C Winkler, B G. Taylor
Initial Results From Comptel—An Overview, V Schonfelder, W Collmar, R Diehl, G G. Lichti, H Steinle, A W. Strong, M Varendorff, H Bloemen, H Deboer, R Vandijk, J W. Den Herder, W Hermsen, L Kuiper, B Swanenburg, C De Vries, A Connors, D J. Forrest, Mark L. Mcconnell, D Morris, James M. Ryan, G Stacy, K Bennett, C Winkler, B G. Taylor
Space Science Center
COMPTEL is presently completing the first full sky survey in MeV gamma‐ray astronomy (0.7 to 30 MeV). An overview of initial results from the survey is given: among these are the observations of the Crab and Vela pulsars with unprecedented accuracy, the observation of the black hole candidates Cyg X‐1 and Nova Persei 1992, an analysis of the diffuse Galactic continuum emission from the Galactic center region, the broad scale distribution of the 1.8 MeV line from radioactive 2 6Al, upper limits on gamma‐ray line emission from SN 1991T, observations of the three quasars 3C273, 3C279 and PKS 0528+134 …
Comptel Observations Of Gamma-Ray Bursts - Imaging And Localization, A Connors, H Aarts, K Bennett, H Bloemen, H Deboer, M Busetta, W Collmar, R Diehl, R Van Dijk, L O. Hanlon, J W. Den Herder, W Hermsen, R M. Kippen, L Kuiper, A. Klumper, G G. Lichti, J Lockwood, John R. Macri, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, V. Schonfelder, G. Simpson, J G. Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, W Webber, O R. Williams, C Winkler
Comptel Observations Of Gamma-Ray Bursts - Imaging And Localization, A Connors, H Aarts, K Bennett, H Bloemen, H Deboer, M Busetta, W Collmar, R Diehl, R Van Dijk, L O. Hanlon, J W. Den Herder, W Hermsen, R M. Kippen, L Kuiper, A. Klumper, G G. Lichti, J Lockwood, John R. Macri, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, V. Schonfelder, G. Simpson, J G. Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, W Webber, O R. Williams, C Winkler
Space Science Center
The COMPTEL experiment on GRO images 0.7-30 MeV celestial gamma-radiation that falls within its 1 steradian field of view. During the first eleven months of orbit, preliminary lozalizations from BATSE triggers indicated that about 1 in 6 cosmic events could have fallen within COMPTEL's field of view. WE present COMPTEL positions for four of the brighter of these gamma-ray bursts.
Comptel Observations Of Gamma-Ray Bursts - Time Profiles And Spectra, W Collmar, K Bennett, H Bloemen, H Deboer, M Busetta, A Connors, R Diehl, J Greiner, L O. Hanlon, J W. Den Herder, W Hermsen, L Kuiper, G G. Lichti, J Lockwood, John R. Macri, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, V. Schonfelder, J G. Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, W Webber, O R. Williams, C Winkler
Comptel Observations Of Gamma-Ray Bursts - Time Profiles And Spectra, W Collmar, K Bennett, H Bloemen, H Deboer, M Busetta, A Connors, R Diehl, J Greiner, L O. Hanlon, J W. Den Herder, W Hermsen, L Kuiper, G G. Lichti, J Lockwood, John R. Macri, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, V. Schonfelder, J G. Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, W Webber, O R. Williams, C Winkler
Space Science Center
The COMPTEL experiment aboard CGRO is designed to image celestial gamma-radiation in the energy range from 0.7-30 MeV, and also to accumulate time-resolved NaI detector spectra (0.1-10 MeV) upon receipt of a BATSE burst trigger signal. During the early phases of the GRO mission several bursts have been observed. In this paper we present time profiles and first results from spectral analysis for GRB 910425, GRB 910601, and GRB 910814.
Comptel Observations Of Cosmic Gamma‐Ray Bursts, C Winkler, K Bennett, H Bloemen, H Deboer, W Collmar, A Connors, R Diehl, L O. Hanlon, J W. Den Herder, W Hermsen, L Kuiper, R M. Kippen, G G. Lichti, J Lockwood, Mark L. Mcconnell, D Morris, James M. Ryan, V Schonfelder, G Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, O R. Williams, M Busetta
Comptel Observations Of Cosmic Gamma‐Ray Bursts, C Winkler, K Bennett, H Bloemen, H Deboer, W Collmar, A Connors, R Diehl, L O. Hanlon, J W. Den Herder, W Hermsen, L Kuiper, R M. Kippen, G G. Lichti, J Lockwood, Mark L. Mcconnell, D Morris, James M. Ryan, V Schonfelder, G Stacy, H Steinle, A W. Strong, B Swanenburg, B G. Taylor, M Varendorff, C De Vries, O R. Williams, M Busetta
Space Science Center
The imaging γ‐ray telescope COMPTEL on board NASA’s Compton Gamma‐Ray Observatory (GRO) has observed many cosmic gamma‐ray bursts during the early mission phase of GRO. COMPTEL records time‐resolved burst spectra over 0.1 MeV to 10 MeV energies, and, for the first time, produces direct single‐telescope gamma‐ray images (0.8–30 MeV) of cosmic gamma‐ray bursts occurring in its 1 sr field of field.
Comptel Images Locations Of Gamma‐Ray Bursts, M Varendorff, K Bennett, H Deboer, M Busetta, H Bloemen, W Collmar, A Connors, R Diehl, J W. Den Herder, W Hermsen, R M. Kippen, L Kuiper, G G. Lichti, J Lockwood, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, V Schonfelder, G Stacy, H Steinle, A W. Strong, B Swanenburg, C De Vries, C Winkler
Comptel Images Locations Of Gamma‐Ray Bursts, M Varendorff, K Bennett, H Deboer, M Busetta, H Bloemen, W Collmar, A Connors, R Diehl, J W. Den Herder, W Hermsen, R M. Kippen, L Kuiper, G G. Lichti, J Lockwood, Mark L. Mcconnell, D Morris, R Much, James M. Ryan, V Schonfelder, G Stacy, H Steinle, A W. Strong, B Swanenburg, C De Vries, C Winkler
Space Science Center
The γ‐ray telescope COMPTEL onboard GRO has so far located 6 gamma‐ray bursts which occurred in its ∼1 sr field of view. The positions of the sources were derived by the maximum‐entropy method. Systematic and statistical uncertainties for the four strongest bursts are approximately 1° to 2° and can be reduced in future analysis.