{
  "bibcode": "2010GCN.10431....1T",
  "body": "Dave Tierney (UCD) \nreports on behalf of the Fermi GBM Team: \n\n\"At 04:38:45.93 UT on 18 February 2010, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 100218A (trigger 288160727 / 100218194).\n\nThe on-ground calculated location, using the GBM trigger \ndata, is RA = 206.6, DEC = -11.9 (J2000 degrees, \nequivalent to 13 h 46 m, -11 d 54 '), with an uncertainty \nof 2.2 degrees (radius, 1-sigma containment, \nstatistical only; there is additionally a systematic\nerror which is currently estimated to be 2 to 3 degrees).\nThe angle from the Fermi LAT boresight is 37 degrees.\n\nThe GBM light curve consists of a single pulse\nwith a duration (T90) of about 30.8 +/- 1.6 s (8-1000 keV). \nThe time-averaged spectrum from T0-4.1 s to T0+28.67 s \nis best fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -0.50 (+0.28/-0.25) and\nthe cutoff energy, parameterized as Epeak, is 184.20 (+52.40/-29.70) keV\n(cstat 845 for 485 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is \n(2.58 +/- 0.21)E-6 erg/cm^2. The 1-sec peak photon flux measured \nstarting from T0+4.7 s in the 8-1000 keV band \nis 1.4 +/- 0.2 ph/s/cm^2.\n\nA Band function fits the spectrum equally well (cstat 840 for 484 d.o.f.) \nwith Epeak= 131.60 (+32.70/-21.70) keV, alpha = -0.14 (+0.41/-0.33) \nand beta = -2.00 (+0.18/-0.30). \n\n\nThe spectral analysis results presented above are preliminary; \nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 10431,
  "createdOn": 1266598135000,
  "email": "david.tierney@ucd.ie",
  "subject": "GRB 100218A : Fermi GBM detection",
  "submitter": "David Tierney at UCD  <david.tierney@ucd.ie>",
  "eventId": "GRB 100218A"
}