Long and faint GRBs in archival BeppoSAX-WFC data

Details Long and faint GRBs in archival BeppoSAX-WFC data Long and faint GRBs in archival BeppoSAX-WFC data

2003-05-20

arxiv.org/abs/astro-ph/0305361v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures (last one in color), to be published in Proc. "GRBs in the afterglow era: 3rd Rome workshop (2002)", eds. L

Scientific paper

In an ongoing effort to search for X-ray transients on diverse time scales in the data archive of the BeppoSAX Wide Field Cameras we have identified four GRBs that are long (between 540 and at least 2550 s) and faint (with 3 events having peak fluxes below 7X10^-9 erg/s/cm2 in 2-10 keV). Three of the events were covered and detected by BATSE, suggesting that there may be a substantial number of bursts still hidden in the BATSE database. A spectral analysis of the three events shows that, although soft, they are not typical X-ray flashes. The fourth event (not covered by BATSE) is within 3' coincident with a double-lobed radio galaxy. The chance probability is estimated at 0.001. If real, the association would be remarkable.

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