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Title: On the nature of the short-duration GRB 050906
Authors: Levan, A. J.
Tanvir, N. R.
Jakobsson, P.
Chapman, R.
Priddey, R. S.
Jarvis, M.
Jakobsson, P.
Hjorth, J.
Fynbo, J. P. U.
Jensen, B. L.
Watson, D.
Hurley, K.
Johnson, R.
Gorosabel, J.
Castro-Tirado, A. J.
Wiersema, K.
First Published: 21-Feb-2008
Publisher: Royal Astronomical Society (RAS)
Citation: Monthly Notices of the Royal Astronomical Society, 2008, 384 (2), pp. 541-547
Abstract: We present deep optical and infrared (IR) observations of the short-duration GRB 050906. Although no X-ray or optical/IR afterglow was discovered to deep limits, the error circle of the gamma-ray burst (GRB) (as derived from the Swift Burst Alert Telescope, or BAT) is unusual in containing the relatively local starburst galaxy IC328. This makes GRB 050906 a candidate burst from a soft gamma-ray repeater (SGR), similar to the giant flare from SGR 1806−20. The probability of chance alignment of a given BAT position with such a galaxy is small (≲1 per cent), although the size of the error circle (2.6 arcmin radius) is such that a higher z origin cannot be ruled out. Indeed, the error circle also includes a moderately rich galaxy cluster at z= 0.43, which is a plausible location for the burst given the apparent preference that short-duration GRBs have for regions of high mass density. No residual optical or IR emission has been observed, in the form of either an afterglow or a later time emission from any associated supernova-like event. We discuss the constraints these limits place on the progenitor of GRB 050906 based on the expected optical signatures from both SGRs and merging compact object systems.
DOI Link: 10.1111/j.1365-2966.2007.11953.x
ISSN: 0035-8711
eISSN: 1365-2966
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

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