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Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
Page(s) 477 - 478
Published online 15 September 1999
DOI: 10.1051/aas:1999317

Astron. Astrophys. Suppl. Ser. 138, 477-478

Severe new limits on the host galaxies of Gamma-Ray Bursts

B.E. Schaefer

Department of Physics, Yale University, New Haven, CT 06520-8121, U.S.A.

Received December 29, 1998; accepted June 9, 1999


Most burst models require bursters to reside in normal host galaxies with peak luminosities of $L = 1 \ 10^{57}$ photon s-1 or $L = 2\
10^{58}$ photon s-1. These models can be directly tested by looking for host galaxies in small GRB error boxes in either of two data sets: (1) 8 optical transients detected for SAX bursts and (2) 23 of the all-time bright bursts. If the hosts are normal galaxies, then analysis of either data set shows $L\gt 6\ 10^{58}$ photon s-1. This result strongly rejects both luminosity cases provided bursters appear in normal host galaxies, with the bright burst sample being free of problems relating to galaxy evolution. In conclusion, bursters are either more distant than allowed for in the star-formation-rate scenario or they are not in normal galaxies.

Key words: gamma-rays: bursts

Copyright The European Southern Observatory (ESO)

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