X-ray Counterparts Search for the Extremely Bright Gamma-Ray Burst on 1993 January 31
Abstract
The gamma-ray burst of January 31, 1993 (GRB930131) was detected with BATSE, EGRET, COMPTEL on board CGRO together with the GRB detector on Ulysses spacecraft. It was the brightest burst recorded by BATSE in the 3rd burst catalog. Its position was determined to narrow annulus by the 3rd Inter-Planetary Network (IPN). We report on a search for an X-ray counterpart to this bright burst with ASCA on 1996 January 9, and detected only one X-ray source in the IPN annulus. Its position coincides with an X-ray source found with ROSAT, which have been identified with the normal F-type star HR4657 at 34 pc. The flux and spectrum obtained with ASCA are consistent with those for an F-type star, and we confirm that the detected X-ray emission comes from HR4657. Although this source is in the IPN annulus, a galactic F-type star is unlikely to be a site of energetic gamma-ray burst phenomena because of their isotropic distribution and remarkably large fluence. Hence we may conclude that quiescent X-ray emissions from the burst counterpart is weaker than ~1 times 10^{-13} erg cm^{-2} s^{-1} which is the detection threshold for the current ASCA search.
- Publication:
-
All-Sky X-Ray Observations in the Next Decade
- Pub Date:
- 1997
- Bibcode:
- 1997asxo.proc..195S