{
  "bibcode": "2015GCN.18727....1T",
  "body": "Kilian Toelge (MPE) and Elisabetta Bissaldi (Politecnico di Bari) \nreport on behalf of the Fermi GBM Team: \n\n\n\"At 05:13:48.86 UT on 27 December 2015, the Fermi Gamma-Ray Burst Monitor \ntriggered and located GRB 151227B (trigger 472886032 / 151227218). \nThe on-ground calculated location, using the GBM trigger data, \nis RA = 287.9, DEC = 31.9 (J2000 degrees, \nequivalent to 19h 11m, 31d 54'), with an uncertainty \nof 1 degree (radius, 1-sigma containment, \nstatistical only; there is additionally a systematic error \nwhich we have characterized as a core-plus-tail model, with 90% of \nGRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg \nsystematic error. [Connaughton et al. 2015, ApJS, 216, 32] ). \n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 90 degrees. \n\nThe GBM light curve consists of three pulses \nwith a duration (T90) of about 43.0 s (50-300 keV). \nThe time-averaged spectrum from T0+20.0 s to T0+49.7 s \nis best fit by a Band function with Epeak = 310 +/- 21 keV, \nalpha = -1.27 +/- 0.02, and beta = -2.17 +/- 0.08. \n\nThe event fluence (10-1000 keV) in this time interval \nis (8.94 +/- 0.09)E-6 erg/cm^2. The 1-sec peak photon flux measured \nstarting from T0+29.8 s in the 8-1000 keV band \nis 36.1 +/- 0.5 ph/s/cm^2.\n\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 18727,
  "createdOn": 1451232337000,
  "email": "Elisabetta.Bissaldi@uibk.ac.at",
  "subject": "GRB 151227B: Fermi GBM detection",
  "submitter": "Elisabetta Bissaldi at U.Innsbruk/IAPP  <Elisabetta.Bissaldi@uibk.ac.at>",
  "eventId": "GRB 151227B"
}