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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2187 SUBJECT: IPN triangulation of GRB030501 (IBIS event; annulus) DATE: 03/05/01 19:01:18 GMT FROM: Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu> K. Hurley, on behalf of the Ulysses GRB team, and A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, report: Ulysses and INTEGRAL (SPI-ACS) also observed this burst (GCN 2183). As observed by Ulysses, it had a duration of approximately 75 seconds, a 25-100 keV fluence of approximately 1.1E-06 erg/cm2, and a peak flux of approximately 4.9E-07 erg/cm2 s over 0.25 seconds. Because this event was quite weak, these parameters are uncertain by a factor of about 2. We have triangulated it to a preliminary annulus centered at RA, Decl(2000)= 332.536, -37.604 degrees, whose radius is 61.259 +/- 0.294 degrees (3 sigma ). This annulus is consistent with, but does not constrain, the IBIS localization given in GCN 2183. This annulus may be improved.
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