TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2633 SUBJECT: Ongoing activity of SGR 1806-20 DATE: 04/07/29 17:31:04 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks on behalf of Konus-Wind and Helicon/Coronas-F teams, T. Cline on behalf of the Konus-Wind team, and A. Rau, A. von Kienlin, G. Lichti on behalf of the INTEGRAL SPI-ACS GRB team report: Since last SGR burst 040615, listed in GCN 2611, Konus-Wind has detected seven SGR-like bursts in the trigger mode: Date Time, Duration, Fluence, Peak Flux, kT* s UT s (20-200 keV) (20-200 keV) keV ergs/cm2 ergs/cm2 s ----------------------------------------------------------------------- 040617 48377.157 0.104 (1.16 +/- 0.04)E-6 (2.28 +/- 0.14)E-5 23+/-3 040622 70209.587 0.332 (5.49 +/- 0.09)E-6 (3.59 +/- 0.18)E-5 17+/-1 040623 81361.257 0.440 (2.49 +/- 0.07)E-6 (1.74 +/- 0.13)E-5 17+/-2 040707 17546.478 0.696 (7.65 +/- 0.12)E-6 (1.86 +/- 0.10)E-5 18+/-1 040719 45188.316 0.264 (3.81 +/- 0.07)E-6 (2.44 +/- 0.21)E-5 20+/-2 040723 42259.178 0.192 (7.51 +/- 0.11)E-6 (5.63 +/- 0.19)E-5 20+/-1 040728 544.709 0.328 (4.36 +/- 0.09)E-6 (2.64 +/- 0.13)E-5 15+/-2 ------------------------------------------------------------------------ * - the last column contains the values of spectral parameter kT for the OTTB spectral model: dN/dE ~ E^{-1} exp(-E/kT) The last burst was also detected by INTEGRAL SPI-ACS at 539.761 s UT. We have triangulated it to an annulus centered at RA(2000) = 302.741 deg, Decl(2000) = -19.181 deg, whose radius is 28.900 +/- 0.478 deg (3 sigma). As the center line of this annulus passes 0.14 degrees from the position of SGR 1806-20, we believe that it is the source of this event. The Konus ecliptic latitude response indicates that the source of the remaining bursts is near ecliptic plane, so we suppose, that they are also originated from SGR 1806-20.