Gamma-Ray Burster Counterparts: HST Blue and Ultraviolet Data

Abstract

The surest solution of the Gamma Ray Burst (GRB) mystery is to find an unambiguous low-energy quiescent counterpart. However, to date no reasonable candidates have been identified in the x-ray, optical, infrared, or radio ranges. The Hubble Space Telescope (HST) has now allowed for the first deep ultraviolet searches for quiescent counterparts. This paper reports on multiepoch ultraviolet searches of five GRB positions with HST. We found no sources with significant ultraviolet excesses, variability, parallax, or proper motion in any of the burst error regions. In particular, we see no sources similar to that proposed as a counterpart to the GRB970228. While this negative result is disappointing, it still has good utility for its strict limits on the no-host-galaxy problem in cosmological models of GRBs. For most cosmological models (with peak luminosity 6X10^50 erg/s), the absolute B magnitude of any possible host galaxy must be fainter than -15.5 to -17.4. These smallest boxes for some of the brightest bursts provide the most critical test, and our limits are a severe problem for all published cosmological burst models.

15 pages, 2 ps figures, accepted for publication in the Astrophysical Journal

Cited by in corpus (7)

• Gamma-Ray Bursts and the Fireball Model
• Gamma Ray Bursts and Bursters
• A Statistical Treatment of the Gamma-Ray Burst "No Host Galaxy" Problem: I. Methodology
• Gravitational Lensing Limits on the Average Redshift of Gamma-Ray Bursts
• Severe New Limits on the Host Galaxies of Gamma Ray Bursts
• A ROSAT Deep Survey of Four Small Gamma-Ray Burst Error Boxes
• A model independent lower limit on the number of Gamma Ray Burst hosts from repeater statistics