Similarity and difference in GRB-associated SN Ic 1998bw and other type Ib/c supernovae

Keiichi Maeda, Koji Kawabata, Masaomi Tanaka, Paolo A. Mazzali, Ken'ichi Nomoto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Type Ic supernova SN 1998bw is a prototype of a supernova (SN) associated with a Gamma-Ray Burst (GRB). In this paper, we present similarities and differences in SN 1998bw and other SNe Ib/c. SN 1998bw is shown to be a highly bipolar explosion viewed from the polar direction, based on comparisons between multi-dimensional radiation transfer calculations and various optical observations. The explosion energy is estimated to be ∼ 10 times that of normal SNe Ib/c, even if the viewing angle effect on the estimate of the energy is taken into account. The typical explosion geometry of other SNe Ib/c are derived based on late-time spectra taken by the SUBARU and VLT telescopes. They are shown to be in general asymmetric as well, likely sharing the similar bipolar geometry. The degree of the asymmetry is shown to be on average smaller in normal SNe Ib/c than in SN 1998bw, indicating the intrinsically different explosion mechanisms.

Original languageEnglish
Title of host publicationDeciphering the Ancient Universe with Gamma-Ray Bursts
Number of pages3
Publication statusPublished - 2010
EventInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts" - Kyoto, Japan
Duration: 2010 Apr 192010 Apr 23

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


ConferenceInternational Symposium "Deciphering the Ancient Universe with Gamma-Ray Bursts"


  • Gamma-ray bursts
  • Radiation transfer
  • Supernovae


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