TITLE: GCN CIRCULAR NUMBER: 7778 SUBJECT: Konus-Wind observation of reactivation of SGR 1627-41 DATE: 08/05/29 09:40:04 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: On May 28, SGR 1627-41 has resumed its activity (Palmer et al. GCN 7777, ATel #1548). Konus-Wind observed in the waiting mode a number of SGR-like bursts (short and soft) on this day. The most intense burst triggered Konus-Wind at T0=38088.659 s UT (10:34:48.659). The burst lc shows a single pulse with a duration of ~270 ms. As observed by Konus-Wind the burst had a fluence of (1.60 +/- 0.10)x10^-6 erg/cm2, and a 2-ms peak flux measured from T0-0.004 s of (3.94 +/- 0.60)x10^-5 erg/cm2 (both in the 20-200 keV range). The spectrum of the burst (from T0 to T0+0.128 s) is well fitted (in the 20-200 keV range) by the OTTB spectral model: dN/dE ~ E^{-1} exp(-E/kT) with kT = 19.9(-1.5, +1.6) keV (chi2 = 11.9/12 dof). The burst demonstrates a significant spectral evolution which is typical for SGR 1627-41 (see the Konus catalog of SGR activity (Aptekar et al. 2001, ApJSS, 137, 227): http://www.ioffe.rssi.ru/LEA/SGR/Catalog/). The Konus-Wind light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/SGRs/080528_T38088/ The following is a list of the most intense bursts observed in the waiting mode on May 28. The source of these short soft bursts is in the south ecliptic latitude, so likely all of them originated from SGR 1627-41 (most of them were detected and localized by the Swift-BAT). -------------------------------------------------------------------- Time Fluence 20-200 keV ------------------------------------------------------------------- 08:21:50 1.6E-7 09:53:06 2.8E-7 10:02:49 2.4E-7 10:12:23 1.2E-7 10:14:27 2.2E-7 10:15:31 2.4E-7 10:19:21 1.8E-7 10:19:33 3.0E-7 10:19:39 2.1E-7 10:19:47 7.7E-7 10:20:32 1.0E-6 18:26:47 2.3E-7 ------------------------------------------------------------------ The last burst from SGR 1627-41 to trigger Konus-Wind was on July 12, 1998 (http://www.ioffe.rssi.ru/LEA/SGR/Catalog/Data/1627/980712.htm).