Search for X-ray Afterglows from Gamma-Ray Bursts in the RASS

Details Search for X-ray Afterglows from Gamma-Ray Bursts in the RASS Search for X-ray Afterglows from Gamma-Ray Bursts in the RASS

1999-12-07

arxiv.org/abs/astro-ph/9912125v1

Astronomy and Astrophysics

Astrophysics

5 pages, LATEX with aipproc.sty, incl. 1 ps-Fig., Proc. of the 5th Huntsville Gamma Ray Burst Symposium, Oct. 1999, ed. R.M. K

Scientific paper

10.1063/1.1361566

We report on 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. Our search procedure generated 23 afterglow candidates, where about 4 detections are predicted. Follow-up spectroscopy of several counterpart candidates strongly suggests a flare star origin of the RASS events in many, if not all, cases. Given the small number of events we conclude that the data are consistent with comparable beaming angles in the X-ray and gamma-ray bands. Models predicting a large amount of energy emerging as a nearly isotropic X-ray component, and a so far undetected class of ``dirty fireballs'' and re-bursts are constrained.

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