//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1071 SUBJECT: IPN detection of SGR1900+14 DATE: 01/06/26 22:54:32 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf of the Ulysses and Konus - Wind GRB teams, and E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, report: Ulysses and Konus observed a burst on 2001 June 25 at 51801 s UT (Earth crossing time) whose origin is probably SGR1900+14. It had a duration of ~2 s, a 25-100 keV fluence of 2.8 x 10^-6 erg/cm^2, and a peak flux over 0.25 s of 3.9x10^-6 erg/cm^2 s. Triangulation gives an annulus centered at RA(2000), Decl(2000) = 17.530 deg, +33.050 deg, with radius 85.548 +/- 0.027 deg. The center line of this annulus passes ~0.018 deg from SGR1900+14. In addition, the Konus data indicate that the source of this event is located in the north ecliptic hemisphere, which is consistent with the location of SGR1900+14, and the spectrum of the burst is soft. This may signal a resurgence of activity from this SGR. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1073 SUBJECT: SGR1900+14: A Burst Localized by HETE DATE: 01/06/28 03:23:44 GMT FROM: George Ricker at MIT SGR1900+14: A Burst Localized by HETE G. Ricker, D. Lamb, and S. Woosley on behalf of the HETE Science Team; R. Vanderspek, G. Crew, J. Doty, G. Monnelly, J. Villasenor; N. Butler, T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Pizzichini, and G. Prigozhin, on behalf of the HETE Operations and HETE Optical-SXC Teams; N. Kawai, M. Matsuoka, Y. Shirasaki, T. Tamagawa, K.Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, and C. Graziani, on behalf of the HETE WXM Team; J-L Atteia, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf of the HETE FREGATE Team; write: At 23:24:18.3 UT (84253.3s UT) on 27 June, the HETE FREGATE and WXM instruments detected and localized an intense burst from SGR1900+14, a soft gamma-ray repeater. This event is the second burst localized from this source in the past week, indicating that it may have resumed an active state. (The first burst was reported in GCN Circular #1071.) The coordinates (J2000) of the 27 June burst are: R.A. = 286.947 (19h07m47s.2) Dec. = +9.362 (+9:21:41) The error circle for this localization is 12 arcmin in radius. SGR1900+14 lies 4.6 arcmin from the HETE position. The burst duration in the 8-40 keV band was <200 ms. A total of 1084 counts above background were detected during that interval, corresponding to a fluence of ~2 x 10-7 ergs cm-2 . The peak flux was >3 x 10-6 ergs cm-2 s-1 (ie >100 x Crab flux). Follow-up observations of this transient are encouraged. Additional information on this burst detection (including light curves), as well as for the HETE mission, will be available at: http://space.mit.edu/HETE/ Acronyms: HETE=High Energy Transient Explorer FREGATE=French Gamma Ray Telescope WXM=Wide Field X-ray Monitor SXC=Soft X-ray Camera This message is citeable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1074 SUBJECT: SGR1900+14: Second Burst Localized by HETE DATE: 01/06/28 16:30:28 GMT FROM: George Ricker at MIT SGR1900+14: A Burst Localized by HETE G. Ricker, D. Lamb, and S. Woosley on behalf of the HETE Science Team; R. Vanderspek, G. Crew, J. Doty, G. Monnelly, J. Villasenor; N. Butler, T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Pizzichini, and G. Prigozhin, on behalf of the HETE Operations and HETE Optical-SXC Teams; N. Kawai, M. Matsuoka, Y. Shirasaki, T. Tamagawa, K.Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, and C. Graziani, on behalf of the HETE WXM Team; J-L Atteia, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf of the HETE FREGATE Team; write: At 15:06:36.51 (54396.51s) UTC on 28 June, the HETE FREGATE and WXM instruments detected and localized an intense burst from SGR1900+14, a soft gamma-ray repeater. This event is the third burst reported from this source in the past week, and the second one reported by HETE on 28 June. (The previous HETE burst was reported in GCN Circular #1073.) The coordinates (J2000) of the burst localized by HETE are: R.A. = 286.803 deg. (19h07m12s.62) Dec. = +9.340 deg. (+9:20:22) The error circle for this localization is 24 arcmin in radius. SGR1900+14 lies 6.2 arcmin from the HETE position. The burst duration in the 8-40 keV band was ~400 ms. A total of 4700 counts above background were detected during that interval, corresponding to a fluence of ~8 x 10-7 ergs cm-2 . The peak flux was ~4 x 10-6 ergs cm-2 s-1 (ie >150 x Crab flux) during a 5 ms interval. Follow-up observations of this transient are encouraged. Additional information on this burst detection (including light curves), as well as for the HETE mission, will be available at: http://space.mit.edu/HETE/ Acronyms: HETE=High Energy Transient Explorer FREGATE=French Gamma Ray Telescope WXM=Wide Field X-ray Monitor SXC=Soft X-ray Camera This message is citeable.