TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1048 SUBJECT: Chandra Observations of SGR 1900+14 DATE: 01/04/24 22:07:48 GMT FROM: Chryssa Kouveliotou at MSFC C. Kouveliotou, A. F. Tennant, M. C. Weisskopf, NASA/MSFC, report on behalf of a larger SGR collaboration: We have examined our overlapping Chandra/RXTE observations of SGR 1900+14 (RXTE TOO, P. Woods, PI). We cannot verify the burst reported in GCN #1047. The source was occulted by the earth at the time in question. We confirm the burst in the Chandra data at approximately 7:15:25 UT. The burst duration appeared to be 0.35 seconds during which 14 counts were recorded (ignoring pile-up). Thus the peak count rate was 65 times the quiescent rate. Adopting the quiescent source spectrum (GCN # 1046), we estimate the peak flux in the 2-10 keV band to be 7.2 x 10^-10 ergs/cm^2 s (2.9 x 10^-9 ergs/cm^2 s in 0.5-10.0 keV). We would like to add a clarification regarding the persistent source flux values in the two GCNs (1046, 1047). Our flux estimates are for the 2-10 keV band to facilitate comparison with data from other satellites; when we expand the energy range to 0.5-10 keV (as in GCN 1047) we find similar values for the quiescent flux. This message can be cited. _____________________________________________ Chryssa Kouveliotou NSSTC, SD-50, Rm 2057 320 Sparkman Drive, Huntsville, AL 35805 tel: 256 961 7604 fax: 256 961 7215