Clocchiatti 2011 SN 1998bw/GRB 980425的光变曲线

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Title:		The Ultimate Light Curve of SN 1998bw/GRB 980425
Authors:		Clocchiatti, Alejandro; Suntzeff, Nicholas B.; Covarrubias, Ricardo; Candia, Pablo
Affiliation:		AA(Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile aclocchi@astro.puc.cl), AB(Department of Physics and Astronomy, Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA ; Staff astronomers, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation. nsuntzeff@tamu.edu), AC(Australian Astronomical Observatory, P.O. Box 296, Epping, NSW 1710, Australia ; Staff astronomers, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation. ricardo@aao.gov.au), AD(Gemini Observatory, Casilla 603, La Serena, Chile ; Staff astronomers, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation. pcandia@gemini.edu)
Publication:		The Astronomical Journal, Volume 141, Issue 5, article id. 163 (2011). (AJ Homepage)
Publication Date:		05/2011
Origin:		IOP
AJ Keywords:		gamma-ray burst: general, supernovae: general, supernovae: individual: SN 1998bw
DOI:		10.1088/0004-6256/141/5/163
Bibliographic Code:		2011AJ....141..163C

Abstract

We present multicolor light curves of SN 1998bw which appeared in ESO184-G82 in close temporal and spatial association with GRB 980425. The light curves are based on observations conducted at Cerro Tololo Inter-American Observatory (CTIO) and data from the literature. The CTIO photometry reaches ~86 days after the gamma-ray burst (GRB) in U and ~160 days after the GRB in BV(RI) _C . The observations in U extend the previously known coverage by about 30 days and determine the slope of the early exponential tail. We calibrate a large set of local standards in common with those of previous studies and use them to transform published observations of the supernova (SN) to our realization of the standard photometric system. We show that the photometry from different sources merges smoothly and we provide a unified set of 300 observations of the SN in five bands. Using the extensive set of spectra in the public domain, we compute extinction and K-corrections and build quasi-bolometric unreddened rest-frame light curves. We provide low-degree piecewise spline fits to these light curves with daily sampling. They reach ~86 rest-frame days after the GRB with U-band coverage and ~498 rest-frame days after the GRB without U.

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