Detection of the optical afterglow of GRB 000630: Implications for dark bursts
Astronomy and AstrophysicsPublished 1 April 2001Open access
J. P. U. Fynbo, B. L. Jensen, J. Gorosabel, J. Hjorth, H. Pedersen, P. Møller
Citations131
SJR quartileQ1
SJR score1.97
SNIP1.43
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Abstract
We present the discovery of the optical transient of the long-duration\ngamma-ray burst GRB000630. The optical transient was detected with the Nordic\nOptical Telescope 21.1 hours after the burst. At the time of discovery the\nmagnitude of the transient was R = 23.04+-0.08. The transient displayed a\npower-law decline characterized by a decay slope of alpha = -1.035+-0.097. A\ndeep image obtained 25 days after the burst shows no indication of a\ncontribution from a supernova or a host galaxy at the position of the\ntransient. The closest detected galaxy is a R=24.68+-0.15 galaxy 2.0 arcsec\nnorth of the transient.\n The magnitudes of the optical afterglows of GRB980329, GRB980613 and\nGRB000630 were all R>=23 less than 24 hours from the burst epoch. We discuss\nthe implications of this for our understanding of GRBs without detected optical\ntransients. We conclude that i) based on the gamma-ray properties of the\ncurrent sample we cannot conclude that GRBs with no detected OTs belong to\nanother class of GRBs than GRBs with detected OTs and ii) the majority (>75%)\nof GRBs for which searches for optical afterglow have been unsuccessful are\nconsistent with no detection if they were similar to bursts like GRB000630 at\noptical wavelengths.\n
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