TITLE: GCN CIRCULAR NUMBER: 6822 SUBJECT: Recent SGR1806-20 Activity DATE: 07/09/24 20:45:04 GMT FROM: Kevin Hurley at UCBerkeley/SSL S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov and T. Cline, on behalf of the Konus-Wind and Konus-A teams, D. Palmer, S. Barthelmy, J. Cummings, N. Gehrels, and H. Krimm, on behalf of the Swift-BAT team, K. Hurley, A. von Kienlin, G. Lichti, A. Rau, D. Gotz, and S. Mereghetti, on behalf of the INTEGRAL GRB team, M. Feroci, P. Soffitta and Y. Evangelista, on behalf of the AGILE team, K. Yamaoka, M. Ohno, Y.E. Nakagawa, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada, T. Murakami, and K. Makishima, on behalf of the Suzaku WAM GRB team, report: SGR1806-20 has become very active since September 14 (Barthelmy et al. GCN 6804). The following is a partial list of bursts observed by some of the IPN spacecraft (some weaker IBIS events did not trigger the INTEGRAL Burst Alert Service). "Loc" means that the burst was localized by triangulation to at least a relatively narrow annulus, or by the Swift BAT or by IBIS. A "no" in this column means that the event has only been localized to a relatively wide ecliptic latitude band. INTEGRAL (GCN 6815) and Chandra target of opportunity observations of this source are planned, and we encourage supporting observations at all wavelengths. Date Time Fluence Observed by Loc 20-200 (at least) keV ------------------------------------------------------------------- 20070914 10:46:02 8.2E-7 BAT,IBIS,KW y 20070914 14:54:47 1.6E-5 KW,KA,SA y 20070914 14:58:44 1.0E-6 KW no 20070914 19:57:57 2.8E-6 BAT,KA y 20070914 21:03:36 4.5E-7 KW no 20070916 07:08:38 6.5E-7 IBIS,KW y 20070916 09:48:08 1.0E-6 IBIS,KW y 20070918 17:08:50 1.6E-5 KW,SA,SPI-ACS,SUZ y 20070919 10:01:51 1.5E-6 IBIS,KW y 20070919 15:13:04 6.5E-7 KW no 20070919 16:01:13 2.4E-6 BAT,KA,KW y 20070919 16:54:44 9.6E-7 KW no 20070919 19:34:50 9.0E-7 IBIS,KW y 20070919 20:45:10 ? BAT,IBIS y 20070920 04:30:11 1.9E-6 IBIS,KW y 20070921 07:11:59 1.4E-6 IBIS,KW y 20070921 11:45:35 4.0E-7 KW no 20070923 12:46:15 2.6E-6 KW,KA no ------------------------------------------------------------------ Some Abbreviations: BAT: Swift Burst Alert Telescope IBIS: Imager on Board the INTEGRAL Satellite KA: Konus-A (Cosmos 2421) KW: Konus-Wind SA: Super-AGILE SPI-ACS: Anticoincidence System of the INTEGRAL Spectrometer SUZ: Suzaku WAM