Observations of an extremely X-ray rich GRB detected by Integral

Details Observations of an extremely X-ray rich GRB detected by Integral Observations of an extremely X-ray rich GRB detected by Integral

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1629k&link_type=abstract

Chandra Proposal ID #05508188

Physics

Chandra Proposal Id #05508188

Scientific paper

Integral has observed an extremely X-ray rich GRB, the richest seen in 3-40 keV. The event was detected with IBIS; it was also the first ever seen in the Jem-X FOV. The IBIS spectrum is very soft, with a spectral index of 2.5 and a flux of 1.4e-8 erg/cm^2 s (15-40 keV). It becomes very faint after 40 keV and is not detectable above 100 keV. The Jem-X peak flux (3-20 keV) is 0.5 Crab (~1.4 e-8 erg/cm^2 s); most of this flux comes below 10 keV! This event is thus a prime example of an XRR GRB, which may be either a classical GRB seen off axis, or a yet different class considered to be intrinsically subenergetic GRBs. There are 3 such bursts observed to date, all associated with SNe. We have approved ESO observations; these, along with information of the source position, energetics, and spectrum, as early as possible, would be crucial in understanding the nature of XRR GRBs and may open a new window in the field, by probing their early properties with the superb CXO capabilities.

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