STScI Preprint #1205
The Gamma Ray Bursts GRB970228 and GRB970508: What have we learnt?
Kailash C. Sahu1,
F. Duccio Macchetto1,
Jan van Paradijs3,4,
Paul J. Groot3,
Titus J. Galama3
We examine what we regard as key observational results on GRB 970228
and GRB 970508 and show that the accumulated evidence strongly
suggests that -ray bursts (GRBs) are cosmological fireballs.
We further show that the observations suggest that GRBs are not
associated with the nuclear activity of active galactic nuclei, and
that late-type galaxies are more prolific producers of GRBs.
We suggest that GRBs can be used to trace the cosmic history of the
star-formation rate. Finally, we show that the GRB locations with
respect to the star-forming regions in their host galaxies and the
total burst energies can be used to distinguish between different
theoretical models for GRBs.
- Appeared in: Huntsville Symposium on Gamma-Ray Bursts 4:483-488, 1998
Space Telescope Science Institute
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Baltimore, MD 21218
Instituto di Technologie e Studio delle Radiazioni Extraterrestri
C.N.R., Via Gobetti 101, I-40129 Bologna, Italy
Astronomical Institute "Anton Pannekoek",
University of Amsterdam, & Center for High Energy Astrophysics,
Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
University of Alabama in Huntsville, Huntsville, AL 35899, USA
Universities Space Research Association,
NASA Marshall Space Flight Center, ES-84, Huntsville, AL 35812, USA
Last updated, December 18, 1997