Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/26286
Title: Swift captures the spectrally evolving prompt emission of GRB 070616
Authors: Starling, R. L. C.
O'Brien, P. T.
Willingale, R.
Page, K. L.
Osborne, J. P.
De Pasquale M.
Kuin, N. P. M.
Page, M. J.
Nakagawa, Y. E.
Onda, K.
Kodaka, N.
Norris, J. P.
Ukwatta, T. N.
Markwardt, C. B.
Ukwatta, T. N.
Burrows, D. N.
Kennea, J. A.
Perri, M.
Markwardt, C. B.
First Published: 21-Feb-2008
Publisher: Royal Astronomical Society (RAS)
Citation: Monthly Notices of the Royal Astronomical Society, 2008, 384 (2), pp. 504-514
Abstract: The origins of gamma-ray burst (GRB) prompt emission are currently not well understood and in this context long, well-observed events are particularly important to study. We present the case of GRB 070616, analysing the exceptionally long-duration multipeaked prompt emission, and later afterglow, captured by all the instruments on-board Swift and by Suzaku Wide-Band All-Sky Monitor (WAM). The high-energy light curve remained generally flat for several hundred seconds before going into a steep decline. Spectral evolution from hard to soft is clearly taking place throughout the prompt emission, beginning at 285 s after the trigger and extending to 1200 s. We track the movement of the spectral peak energy, whilst observing a softening of the low-energy spectral slope. The steep decline in flux may be caused by a combination of this strong spectral evolution and the curvature effect. We investigate origins for the spectral evolution, ruling out a superposition of two power laws and considering instead an additional component dominant during the late prompt emission. We also discuss origins for the early optical emission and the physics of the afterglow. The case of GRB 070616 clearly demonstrates that both broad-band coverage and good time resolution are crucial to pin down the origins of the complex prompt emission in GRBs.
DOI Link: 10.1111/j.1365-2966.2007.12763.x
ISSN: 0035-8711
eISSN: 1365-2966
Links: http://hdl.handle.net/2381/26286
http://mnras.oxfordjournals.org/content/384/2/504
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2008 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

Files in This Item:
File Description SizeFormat 
MNRAS-2008-Starling-504-14.pdfPublished (publisher PDF) 792.4 kBAdobe PDFView/Open


Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.