{
  "bibcode": "2021GCN.30838....1R",
  "body": "A. Ridnaia, S. Golenetskii, D. Frederiks, M. Ulanov,\nD. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline\non behalf of the Konus-Wind team, report:\n\nSince the last KW GCN on the ongoing SGR 1935+2154 activity\n(Ridnaia et al., GCN 30803) the instrument triggered on\nfour bright bursts from the source.\n\nThe following is a list of the Konus-Wind triggers with preliminary\nestimates of the burst fluences and peak fluxes.\n------------------------------------------------------------------\n#  Date       T0(KW) s UT                  Fl*           PF**\n------------------------------------------------------------------\n1 20210911 54406.825 s UT(15:06:46.825)  5.38 +/-0.15  22.6 +/-1.6\n2 20210911 61274.025 s UT(17:01:14.025)  7.84 +/-0.21  18.5 +/-1.4\n3 20210912 24677.185 s UT(06:51:17.185)  4.96 +/-0.14  26.6 +/-1.7\n4 20210912 28904.121 s UT(08:01:44.121)  1.25 +/-0.02  17.0 +/-1.4\n------------------------------------------------------------------\n*  -  Fluence (20-500 keV) in units of 1e-6 erg/cm2\n\n** - Peak Flux (20-500 keV) on 16-ms time scale\n        in units of 1e-6 erg/cm2/s\n\nThe time-averaged spectra of the bursts are well fit in the\n20 - 200 keV range by a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with the following parameters:\n------------------------------------------------------------------\n#   T100   Tbeg-Tend         alpha            Ep(keV)    chi2/dof\n------------------------------------------------------------------\n1  0.392   0 - 0.256    0.47(-0.32,+0.33)    42(-2,+2)     30/20\n2  1.243   0 - 8.448    0.40(-0.37,+0.39)    37(-2,+1)     36/28\n3  0.452   0 - 0.256    0.20(-0.35,+0.37)    38(-2,+2)     17/19\n4  1.600   0 - 8.448   -0.10(-0.21,+0.22)    35(-1,+1)     43/29\n------------------------------------------------------------------\nThe emission in all bursts is seen up to ~200 keV.\n\nThe Konus-Wind light curves of the bursts are available at\nhttp://www.ioffe.ru/LEA/SGRs/210911_T54406/\nhttp://www.ioffe.ru/LEA/SGRs/210911_T61274/\nhttp://www.ioffe.ru/LEA/SGRs/210912_T24677/\nhttp://www.ioffe.ru/LEA/SGRs/210912_T28904/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 30838,
  "createdOn": 1631555797000,
  "email": "ridnaia@mail.ioffe.ru",
  "subject": "Konus-Wind observation of the recent SGR 1935+2154 activity",
  "submitter": "Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>",
  "eventId": "SGR 1935+2154"
}