ASTRONOMYANDASTROPHYSICS Detection of the optical afterglow of GRB 000630: Implications for dark bursts ⋆
ASTRONOMYANDASTROPHYSICS Detection of the optical afterglow of GRB 000630: Implications for dark bursts ⋆
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天文学和天体物理学 GRB 000630 光学余辉的检测：对暗爆发的影响 ⋆
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通讯作者：
G. Nucera
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作者：
O S Ilesanmi;F. Chirico;A. Afolabi;G. Nucera
. We present the discovery of the optical transient of the long–duration gamma-ray burst GRB 000630. The optical transient was detected with the Nordic Optical Telescope 21.1 hours after the burst. At the time of discovery the magnitude of the transient was R = 23.04 ± 0.08. The transient displayed a power-law decline characterized by a decay slope of α = − 1.035 ± 0.097. A deep image obtained 25 days after the burst shows no indication of a contribution from a supernova or a host galaxy at the position of the transient. The closest detected galaxy is a R=24.68 ± 0.15 galaxy 2.0 arcsec north of the transient. The magnitudes of the optical afterglows of GRB 980329, GRB 980613 and GRB 000630 were all R & 23 less than 24 hours from the burst epoch. We discuss the impli-Send cations of this for our understanding of GRBs without detected optical transients. We conclude that i) based on the gamma-ray properties of the current sample we cannot conclude that GRBs with no detected OTs belong to another class of GRBs than GRBs with detected OTs and ii) the majority ( & 75%) of GRBs for which searches for optical afterglow have been unsuccessful are consistent with no detection if they were similar to bursts like GRB 000630 at optical wavelengths.
