TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1021 SUBJECT: GRB010324: BeppoSAX/GRBM data DATE: 01/03/26 17:32:41 GMT FROM: Filippo Frontera at ITESRE CNR C. Guidorzi, E. Montanari and F. Frontera, Physics Dept. University of Ferrara; F. Calura, Dept of Physics University of Trieste; L. Amati, Istituto TESRE, CNR, Bologna; and M. Feroci, Istituto Astrofisica Spaziale, CNR, Roma; on behalf of the BeppoSAX/GRBM Team, and K. Hurley on behalf of the Ulysses GRB Team, report: GRB010324 (GCN/RXTE ASM Burst Position Notice of Sat. 24 Mar 01 and GCN 1011) triggered the BeppoSAX/GRBM at 11h32m46s UT, 285.4 s before the ASM trigger. From the GRBM 40-700 keV light curve, the actual onset time is about 80 s before the GRBM trigger time. The event shows a multi-peak behavior with an outstanding peak occurring 10 s after the GRBM trigger time and a peak flux of 1100 cts/s, corresponding to ~1x10^-6 erg/cm^2 s. The trigger time of ASM occurs in correspondence of the tail of the last peak of the burst, whose centroid is ~360 s after the onset time and its peak flux is a factor 8 lower than that of the main peak. This message can be cited.