TITLE: GCN CIRCULAR NUMBER: 8913 SUBJECT: Ongoing activity of AXP/SGR 1E1547.0-5408 DATE: 09/02/22 16:55:58 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov and T. Cline, on behalf of the Konus-Wind team, report: Two very bright SGR bursts triggered Konus-Wind at 2009-02-21 T0=55653.101 s UT (15:27:33.101) and 2009-02-22 T0=1694.689 s UT (00:28:14.689). The first was also detected by Fermi/GBM (trigger 256922856). The GBM location is consistent with the AXP/SGR 1E1547.0-5408 position. The Konus ecliptic latitude response indicates that the source of these bursts is in the south ecliptic hemisphere. So, we believe they originated from AXP/SGR 1E1547.0-5408. Preliminary estimations yields for the first burst a fluence of ~1.6x10^-5 erg/cm2, a peak flux on 2ms time scale of ~2.3x10^-4 erg/cm2/s (both in the 20-300 keV), and Ep ~50 keV for the time-integrated spectrum, and for the second burst a fluence of 4.3x10^-6 erg/cm2, a peak flux on 2ms time scale of ~1.4x10^-4 erg/cm2/s (both in the 20-300 keV), and Ep ~40 keV for the time-integrated spectrum. The Konus-Wind light curves of these bursts are available at http://www.ioffe.ru/LEA/SGRs/090221_T55653/ and http://www.ioffe.ru/LEA/SGRs/090222_T01694/ Since January 29 (Golenetskii et al., 8863) seven bright bursts from the AXP/SGR 1E1547.0-5408 have triggered Konus-Wind: ------------------------------------ Date T0, s UT ------------------------------------ 2009-02-03 8722.534 (02:25:22.534) 2009-02-03 70382.351 (19:33:02.351) 2009-02-04 73637.930 (20:27:17.930) 2009-02-12 43144.456 (11:59:04.456) 2009-02-14 70303.255 (19:31:43.255) 2009-02-21 55653.101 (15:27:33.101) 2009-02-22 01694.689 (00:28:14.689) ------------------------------------