The ultimate light curve of SN 1998bw/GRB 980425

Alejandro Clocchiatti, Nicholas B. Suntzeff, Ricardo Covarrubias, Pablo Candia

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number163
JournalAstronomical Journal
Issue number5
StatePublished - May 2011
Externally publishedYes


  • gamma-ray burst: general
  • supernovae: general
  • supernovae: individual (SN 1998bw)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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