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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1956 SUBJECT: GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC DATE: 03/03/25 21:33:01 GMT FROM: Don Lamb at U.Chicago <lamb@oddjob.uchicago.edu> C. Graziani, Y. Shirasaki, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, M. Suzuki, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, T. Donaghy, Y. Nakagawa, D. Takahashi, R. Satoh, and Y. Urata, on behalf of the HETE WXM Team; G. Ricker, J-L Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf of the HETE Science Team; R. Vanderspek, J. Villasenor, G. Crew, J. Doty, G. Monnelly, N. Butler, T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; M. Boer, J-F Olive, J-P Dezalay, C. Barraud and K. Hurley on behalf of the HETE FREGATE Team; write: At 21:56:57.60 UTC (79017.60 s UT) on 23 Mar 2003, the HETE FREGATE, WXM, and SXC instruments detected event H2460, a faint, long GRB. Ground analysis of the WXM data produced a localization which was reported in a GCN Notice at 02:55:11 UT on 24 Mar, about 5 hours after the burst. The WXM localization SNR was 6. The WXM localization can be expressed as a 90% confidence circle that is 18 arcminutes in radius and is centered at WXM: RA = +11h 06m 54s, Dec = -21d 51' 00" (J2000). Ground analysis of the SXC data for the burst produced a more accurate location which was reported in a GCN Notice at 05:28:51 UT on 24 Mar, about 7 1/2 hours after the burst. The SXC localization can be expressed as a 90% confidence trapezoid, whose base and top are 24.5 and 11 arcminutes, whose height is 4 arcminutes, and whose area is 71 square arcminutes. The center of the trapezoid lies at RA = +11h 06m 06s, Dec = -21d 54' 20" (J2000), and its corners lie at RA = +11h 05m 59.0s, Dec = -21d 48' 43" RA = +11h 05m 56.6s, Dec = -21d 59' 46" RA = +11h 06m 12.5s, Dec = -22d 06' 43" RA = +11h 06m 17.8s, Dec = -21d 42" 11" (J2000). The SXC localization is trapezoidal because its sides are defined by the WXM error circle. The t_90 duration of the burst in the 30-400 keV band was 26 s. The fluence of the burst was 1.1 x 10-6 ergs cm-2 and the peak flux in 1.2 sec was ~1.2 x 10-9 ergs cm-2 s-1 (i.e., ~ 0.05 x Crab flux) in the same energy band. A light curve and skymap for GRB030323 is provided at the following URL: http://space.mit.edu/HETE/Bursts/GRB030323
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