{
  "bibcode": "2006GCN..4946....1G",
  "body": "S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks and\nT. Cline on behalf of the Konus-Wind team, report:\n\nKonus-Wind triggered twice on March 29 due to SGR 1900+14 activity.\nThe first trigger occurred at 5282.959 s UT (01:28:02.959).\nThis burst was detected and located by Swift BAT (Moretti et al., GCN\n4933). It was an ordinary single spike SGR burst with a duration of\n~0.07 sec. It had a fluence 7.21(-1.46,+0.91)x10^-7 erg/cm2 (in the\n20-200 keV range). Its spectrum is well fitted by OTTB model with\nkT=18.3(-3.1,+3.7) keV. All the quoted errors are at the 90% confidence\nlevel.\n\nMuch more interesting event triggered Konus-Wind at T0=9928.369 s UT\n(02:45:28.369). It was a series of bursts. The trigger part of the\nseries contains seven intense bursts and several substantially weaker\nbursts. The fluences of the intense bursts vary from ~10^-7 to\n1.5x10^-6 erg/cm2 (in the 20-200 keV range).\nAt this time Swift was in SAA and did not detect these bursts.\n\nAfter the end of the Konus-Wind trigger record and during data\nread-out much more intense cluster of the bursts (observed and located\nby Swift-BAT (Romano et al., GCN 4934) was detected by Konus-Wind at\nT-T0=458 s (02:53:08) with coarse time resolution of 3.96 sec.\nAs observed by Konus-Wind the cluster had a duration of ~25 sec.\nFortunately, the multichannel spectra were accumulated by Konus-Wind\nduring this cluster of bursts.\nWe conservatively estimate the cluster fluence to be\n(1-2)10^-4 erg/cm2 (in the 20-200 keV range).\nThis value can be refined.\n\nIt is worth to notice that the reactivation of SGR 1900+14 in 1998\nstarted with several single bursts, which were shortly followed by a\nseries of bursts on 1998 May 30.\n(http://www.ioffe.rssi.ru/LEA/SGR/Catalog/Data/1900/980530a.htm ;\nAptekar et al., ApJSS, 137, 227 (2001))\nThis series occurred 89 days before the 27 August 1998 giant flare.\nThe first burst series from SGR 1806-20 was detected on 2004 October 5\nby INTEGRAL-IBIS/ISGRI (Mereghetti et al., GCN 2763;\nGotz, Mereghetti, and Mirabel, GCN 2764)\nand Konus-Wind (Golenetskii et al., GCN 2769),\n83 days before the 27 December 2004 giant flare from this SGR.\nOther two series from SGR 1806-20 were detected by Konus-Wind on 2004\nDecember 21 and 25.\n\nThe March 29 series, considered here, resembles the burst series\nmentioned above, and has several times greater fluence.\n\nWe conclude that at present time SGR 1900+14 demonstrates a behavior\nsimilar to pre-giant flare state. So we may expect a further increase\nactivity of SGR 1900+14 and a repeated (!) giant flare from this SGR at \nthe latter half of June.",
  "circularId": 4946,
  "createdOn": 1144076584000,
  "email": "val@mail.ioffe.ru",
  "subject": "Konus-Wind observation of the recent SGR 1900+14 activity.  Will",
  "submitter": "Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>"
}