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Search for GRB X-ray afterglows in the ROSAT all-sky survey | | J. Greiner
; D.H. Hartmann
; W. Voges
; Th. Boller
; R. Schwarz
; S. Zharikov
; | | Date: |
15 Oct 1999 | | Subject: | astro-ph | | Affiliation: | Astrophys. Inst. Potsdam, Germany), D.H. Hartmann (Clemson, USA), W. Voges, Th. Boller (both MPE Garching, Germany), R. Schwarz (AIP, Germany), S. Zharikov (SAO, Russia | | Abstract: | We describe a search for X-ray afterglows from gamma-ray bursts using the ROSAT all-sky survey (RASS) data. If the emission in the soft X-ray band is significantly less beamed than in the gamma-ray band, we expect to detect many afterglows in the RASS. We found 23 afterglow candidates, where about 4 detections are predicted. However, follow-up spectroscopy of several counterpart candidates strongly suggests a flare star origin of the RASS events in many cases. We conclude that the RASS data are consistent with comparable beaming angles in the X-ray (within a few hours of the burst) and gamma-ray bands. However, models predicting a large amount of energy emerging as a nearly isotropic X-ray component of the early afterglow are severely constrained by the ROSAT data. In particular, a so far undetected class of ``dirty fireballs’’ and delayed ``rebursts’’ are constrained. | | Source: | arXiv, astro-ph/9910300 | | Services: | Forum | Review | PDF | Favorites | |
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