Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1617k&link_type=abstract
Chandra Proposal ID #05508167
Other
Chandra Proposal Id #05508167
Scientific paper
GRB03120, a seemingly typical burst was localized to a 5-arcmin region by Integral. XMM found a source with initial flux of 3E-13 erg/cm2/s which faded as t^{-0.4} during t=0.25 to 6 days. Separately, we detected a slowly fading radio counterpart. The X-ray/radio source is coincident with a bright, z=0.105 galaxy. Relative to other afterglows, the fading of the radio/X-ray is unusually slow. Furthermore, the 1E+43 erg/s X-ray luminosity and the 1E+29 erg/s/Hz radio luminosity are 10 - 1000 times less than for typical afterglows, yet comparable to those observed for GRB980425/SN1998bw. Most curiously, there is no optical afterglow or hint of an underlying supernova. Keck host spectrum rules out an AGN origin for the X-ray source. We conclude that GRB 031203 is a new type of cosmic explosion with some parallels. As argued below, our continued VLA campaign complemented by the proposed Chandra observations offer us the best chance to decipher the nature of this mysterious source.
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