TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1104 SUBJECT: GRB010923 as seen by BeppoSAX GRBM DATE: 01/10/01 19:01:06 GMT FROM: Cristiano Guidorzi at Phys.Dept, U.of Ferrara(Italy) E. Montanari, C. Guidorzi and F. Frontera, Physics Dept, University of Ferrara; L. Amati, ITESRE, CNR, Bologna, on behalf of the GRBM BeppoSAX team, report: The gamma-ray burst GRB010223 reported by the HETE team (GCN/HETE_POSITION H1764, GCN 1102) was also detected by the BeppoSAX GRBM (units 1 and 4) with onset at 09:24:29 UT of September 23, 2001. The event was classified (GCN 1102) as short (<1 s) GRB. However, on the basis of the GRBM data, in addition to the double peak structure reported by HETE, the 40-700 keV time profile shows another peak starting 2 s after the burst onset, and lasting ~2 s. The time duration in terms of T90 is thus found to be ~4 s. The FWHM of the first two peaks also detected by HETE are estimated about 200 ms and 350 ms, respectively. The total counts collected during the event are 2680, with 540 cts in the first peak, 1600 cts in the second one and 540 cts in the last peak. A preliminary spectral analysis shows that the total fluence in the 80-600 keV range is about 2.5 x 10-6 ergs cm-2. The spectral hardness, as estimated from the ratio between the 100-700 keV counts and those in the 40-100 keV band, looks softer than typical short bursts. From GRBM data we derived the following rough position: R.A. = 312 deg, Decl.= +17 deg, with an error radius of 25 deg (inclusive of 10 deg systematics). In summary, GRBM data suggest that GRB010923 is more likely to be an "intermediate" burst, both for its time duration and its spectral hardness. This message can be cited.