Journal Article

Where are <i>Swift</i> γ-ray bursts beyond the ‘synchrotron deathline’?

V. Savchenko and A. Neronov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 2, pages 935-945
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14747.x
Where are Swift γ-ray bursts beyond the ‘synchrotron deathline’?

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We study time-resolved spectra of the prompt emission of Swiftγ-ray bursts (GRB). Our goal is to see if previous BATSE claims of the existence of a large amount of spectra with the low-energy photon indices harder than 2/3 are consistent with Swift data. We perform a systematic search of the episodes of the spectral hardening down to the photon indices ≤2/3 in the prompt emission spectra of Swift GRBs. We show that the data of the Burst Alert Telescope (BAT) instrument on board of Swift are consistent with BATSE data, if one takes into account differences between the two instruments. Much lower statistics of the very hard spectra in Swift GRBs are explained by the smaller field of view and narrower energy band of the BAT telescope.

Keywords: radiation mechanisms: non-thermal; gamma-rays: bursts; gamma-rays: observations

Journal Article.  8669 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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