Levan, A. J., Tanvir, Nial R., Jakobsson, Páll, Chapman, R. (Robert), Hjorth, J. (Jens), Priddey, Robert S., Fynbo, J. P. U., Hurley, K., Jensen, B. L., Johnson, R., Gorosabel, Javier, Castro-Tirado, A. J. (Alberto J.), Jarvis, Matt J., Watson, Darach and Wiersema, K.. (2008) On the nature of the short-duration GRB 050906. Monthly Notices of the Royal Astronomical Society, Volume 384 (Number 2). pp. 541-547. ISSN 0035-8711

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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 (less than or similar to 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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Gamma ray bursts
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley
ISSN:	0035-8711
Date:	21 February 2008
Volume:	Volume 384
Number:	Number 2
Number of Pages:	7
Page Range:	pp. 541-547
Identification Number:	10.1111/j.1365-2966.2007.11953.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Spain. Ministerio de Educación y Ciencia (MEC), Danmarks Grundforskningsfond [Danish National Research Foundation], Sixth Framework Programme (European Commission) (FP6)
Grant number:	AYA2004-01515, ESP2005-07714-C03-0 (MEC), MEIF-CT-2006-042001 (FP6)
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URI:	http://wrap.warwick.ac.uk/id/eprint/30611

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