Gamma-ray bursts' spectra and synchro-curvature mechanism
نویسندگان
چکیده
منابع مشابه
The spectra of short Gamma–Ray Bursts
We present the results of the spectral analysis of a sample of short bright γ–ray bursts (GRB) detected by BATSE and compare them with the average and time resolved spectral properties of long bright bursts. While the spectral parameters of short GRBs confirm, as expected from previous works based on the hardness ratio, that they are harder than long events, we find that this difference is main...
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We extend a previous work on the intrinsic spectral properties and energetics of GRBs with known redshift based on 12 BeppoSAX events by including in the sample a total of 10 more events detected either by BATSE, BeppoSAX or HETE–2. An indication of a trend of the total isotropic equivalent radiated energy, Erad, with redshift is found and, remarkably, the previously found relationship between ...
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We compare the spectral properties of 79 short and 79 long Gamma–Ray Bursts (GRBs) detected by BATSE and selected with the same limiting peak flux. Short GRBs have a low–energy spectral component harder and a peak energy slightly higher than long GRBs, but no difference is found when comparing short GRB spectra with those of the first 1–2 sec emission of long GRBs. These results confirm earlier...
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In three years of operation, COMPTEL has measured the locations (mean accuracy 1 ) and spectra (0.75{30 MeV) of 18 gamma-ray bursts and continues to observe new events every 1{2 months. The existing COMPTEL bursts have been analyzed as a group to study the smallscale angular distribution and MeV emission properties. Furthermore, measurements of individual strong bursts like GRB 930131 and GRB 9...
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As a result of spherical kinematics, temporal evolution of received gammaray emission should demonstrate signatures of curvature from the emitting shell. Specifically, the shape of the pulse decay must bear a strict dependence on the degree of curvature of the gamma-ray emitting surface. We compare the spectral evolution of the decay of individual GRB pulses to the evolution as expected from cu...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20041514