{
  "bibcode": "2015GCN.18321....1S",
  "body": "D. Svinkin, D. Frederiks, and V. Pal'shin,\non behalf of the Konus-Wind team, report:\n\nIt was suggested by Levan et. al. (GCN 18263) that the short-duration,\nhard-spectrum, bright GRB 150906B (Golenetskii et al. GCN 18259) might\nbe connected with the NGC 3313 galaxy group. Continuing the discussion\non the possible origin of GRB 150906B (Ruffini et al. GCN 18296 and\nF. Zhang et al. GCN 18298) we present a further analysis of the KW data\nfor this GRB.\n\nAmong ~300 bursts from the Konus catalog of short GRBs\n(Svinkin et al., in preparation), GRB 150906B is within top 25%\nin the terms of 16-ms peak energy flux and within top 3% in the terms\nof the total energy fluence, both in the 20 keV - 10 MeV range.\nIn the terms of Epeak (CPL model), the burst is within 25% hardest\nGRBs in the sample.\n\nHowever, the burst duration is rather long T50=0.952+/-0.036 s\n(T90 = 1.642+/-0.076 s). The position of the GRB 150906B in\nthe hardness-duration diagram (logT50-logHR32) of 1143 KW bright GRBs\ncannot exclude that the burst comes from the long GRB population.\nThe figure showing the hardness-duration diagram is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB150906_T31340/GRB150906B_T50HR.png\nThe contours denote the 1, 2, and 3 sigma confidence regions for\ntwo-dimensional Gaussian distributions. The HR32 is the ratio of counts\nin the 200-760 keV and 50-200 keV bands accumulated during burst\nduration. The vertical dashed line at T50=0.6 s marks the boundary used\nby Svinkin et al. to distinguish between short and long KW GRBs.\n\nThe spectral lag calculated between the KW 400-1500 keV and 25-100 keV\nband light curves (tau = 70+/-40 ms, 68% confidence level)\nis consistent, within 68% CL, with the KW lag distributions\nfor both short and long GRBs.\n\nThus, being hard enough, GRB 150906B cannot be unambiguously\nclassified as a short/hard from the KW data.",
  "circularId": 18321,
  "createdOn": 1442410388000,
  "email": "svinkin@mail.ioffe.ru",
  "subject": "GRB 150906B: Further analysis of the Konus-Wind data",
  "submitter": "Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>",
  "eventId": "GRB 150906B"
}