3rd Interplanetary Network Localization, Time History, Fluence, Peak Flux, and Distance Lower Limit of the February 28, 1997 Gamma-Ray Burst

Astronomy and Astrophysics – Astrophysics

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11 pages, postscript, 2 figures. Accepted for publication in ApJ Letters

Scientific paper

10.1086/310808

The gamma-ray burst of 1997 February 28 was localized using the arrival-time analysis method with the Ulysses, BeppoSAX, and WIND spacecraft. The result is a plus-or-minus 31.5 arcsec (3 sigma) wide annulus of possible arrival directions which intersects both the position of the burst determined independently by the SAX Wide Field Camera, and the position of a fading X-ray source detected by the SAX focussing X-ray telescopes, and reduces these source location areas by factors of 7 and 1.5 respectively. The combination of the annulus and the SAX locations, a 0.76 square arcminute error box, is consistent with that of an optical transient source and an extended object, possibly a galaxy. We also present the time history, peak flux, and fluence of this event, and derive a model-independent lower limit to the source distance of ~11000 AU.

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