Progentiors of GRBs: Massive Stars

Largest Explosions in the Universe May Come from the Death of Massive Stars

In a scientific paper to appear in Nature on 30 September 1999, our team argues that at least some gamma-ray bursts, some of the brightest explosions in the Universe, originate from the death of massive stars. Please read the Caltech Press Release.
Note: This is EMBARGOED to the general press until 29 September 1999.

Visit the Caltech Media Relations Web site at:

Click HERE for the press release on the paper:

"The unusual afterglow of the gamma-ray burst of 26 March 1998 as evidence for a supernova connection"
J. S. Bloom, S. R. Kulkarni, S. G. Djorgovski, A. C. Eichelberger, P. Côté, J. P. Blakeslee, S. C. Odewahn, F. A. Harrison, D. A. Frail, A. V. Filippenko, D. C. Leonard, A. G. Riess, H. Spinrad, D. Stern, A. Bunker, A. Dey, B. Grossan, S. Perlmutter, R. A. Knop, I. M. Hook, M. Feroci

Illustrations of a massive star explosion, pictures of the fading source from the Keck 10-meter telescope, and a schematic diagram of what was detected can be found HERE.
See an animated gif movie of the fading optical source HERE
  • Robert Tindol, Caltech Media Relations, +1-626-395-3631 (
  • Joshua S. Bloom, Caltech Astronomy, +1-626-695-1243 (
  • Prof. Shrinivas R. Kulkarni, Caltech Astronomy, +1-626-395-4010 (
  • Prof. S. George Djorgovski, Caltech Astronomy, +1-626-395-4415 (
  • Andrew Perala, W.M. Keck Observatory, +1-808-885-7887 (

This page and in-house links were created and maintained by Joshua Bloom (