The late afterglow and host galaxy of GRB 990712

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dc.creatorHjorth, Jens
dc.creatorHolland, Stephen
dc.creatorCourbin, Frederic
dc.creatorDar, Arnon
dc.creatorOlsen, Lisbeth F.
dc.creatorScodeggio, Marco
dc.date2000-03-24
dc.date2000-03-28
dc.date.accessioned2026-07-07T01:52:54Z
dc.date.available2026-07-07T01:52:54Z
dc.descriptionWe present deep HST imaging, as well as ground-based imaging and spectroscopy, of the optical afterglow associated with the long-duration gamma-ray burst GRB 990712 and its host galaxy. The data were obtained 48--123 days after the burst occurred. The magnitudes of the host (R = 21.9, V = 22.5) and optical afterglow (R = 25.4, V = 25.8, 47.7 days after the burst) favor a scenario where the optical light follows a pure power-law decay with an index of alpha ~ -1.0. We find no evidence for a contribution from a supernova like SN1998bw. This suggests that either there are multiple classes of long-duration gamma-ray bursts, or that the peak luminosity of the supernova was > 1.5 mag fainter than SN1998bw. The HST images and EFOSC2 spectra indicate that the gamma-ray burst was located in a bright, extended feature (possibly a star-forming region) 1.4 kpc from the nucleus of a 0.2 L^*_B galaxy at z = 0.434, possibly a Seyfert 2 galaxy. The late-time afterglow and host galaxy of GRB 990712 bear some resemblance to those of GRB 970508.
dc.description7 pages, 2 figures, to appear in ApJL (last author name corrected in revised version)
dc.identifierhttps://arxiv.org/abs/astro-ph/0003383
dc.identifierhttp://arxiv.org/abs/astro-ph/0003383
dc.identifierAstrophys.J. 534 (2000) L147-L150
dc.identifierdoi:10.1086/312683
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/778
dc.subjectAstrophysics
dc.titleThe late afterglow and host galaxy of GRB 990712
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