{
  "bibcode": "2020GCN.27883....1T",
  "body": "A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks,\nM. Ulanov, D. Svinkin, A. Lysenko, A. Ridnaia and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe long-duration, soft-spectrum GRB200528A\n(Swift detection: Ambrosi et al., GCN 27832;\nBarthelmy et al., GCN 27839;\nFermi GBM Observation: Fletcher, von Kienlin & Meegan, GCN 27841;\nCALET Gamma-Ray Burst Monitor detection: Pal'shin et al., GCN 27855)\ntriggered Konus-Wind at T0=37675.256 s UT (10:27:55.256).\n\nThe burst light curve shows a complex structure\nwhich starts at ~T0-33.8 s, with a total duration of~60.0 s,\nand comprises two double-peaked emission episodes.\nThe emission is seen up to ~1 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 2.12(-0.07,+0.07)x10^-5 erg/cm2,\nand a 64-ms peak energy flux, measured from T0+1.696 s,\nof 2.38(-0.35,+0.35)x10^-6 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum of the burst\n(measured from T0 to T0+33.024 s)\nis best fit in the 20 keV - 1 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith�� alpha = -1.41(-0.14,+0.14),\nand Ep = 64(-5,+5) keV (chi2 = 50/60 dof).\nFitting by the GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index:\nbeta < -2.89 (chi2 = 49/59 dof).\n\nThe spectrum near the peak count rate\n(measured from T0+0.256 to T0+8.448 s)\nis best fit in the 20 keV - 1 MeV range\nby the power law with exponential cutoff model\nwith�� alpha = -1.14(-0.15,+0.16),\nand Ep = 75(-4,+5) keV (chi2 = 52/60 dof).\nFitting by the GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index:\nbeta < -3.03 (chi2 = 51/59 dof).\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB200528_T37675/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 27883,
  "createdOn": 1591088801000,
  "email": "tsvetkova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB200528A",
  "submitter": "Anastasia Tsvetkova at Ioffe Institute  <tsvetkova@mail.ioffe.ru>",
  "eventId": "GRB 200528A"
}