{
  "bibcode": "2010GCN.10714....1T",
  "body": "Dave Tierney (UCD) and Sheila McBreen (UCD/MPE) \nreport on behalf of the Fermi GBM Team: \n\n\"At 13:18:03.89 UT on 03 May 2010, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 100503A (trigger 294585485 / 100503554).\n\nThe on-ground calculated location, using the GBM trigger \ndata, is RA = 147.5, DEC = 4.0 (J2000 degrees, \nequivalent to 09 h 50 m, 4 d 0 '), with an uncertainty \nof 1.5 degrees (radius, 1-sigma containment, \nstatistical only; there is additionally a systematic\nerror which is currently estimated to be 2 to 3 degrees).\n�\nThe angle from the Fermi LAT boresight is 63 degrees.\n\nThe GBM light curve consists of multiple peaks\nwith a duration (T90) of 129.5 +/- 9.9 s (50-300 keV). \nThe time-averaged spectrum from T0-4 s to T0+52 s is \nbest fit by a power law function with an exponential\nhigh energy cutoff. The power law index is -0.99 (+0.06/-0.05)\nand the cutoff energy, parameterized as Epeak, \nis 211.60 (+18.30/-15.50) keV (Cstat 877 for 601 d.o.f.).\n\nThe event fluence (10-1000 keV) in this time interval is \n(1.23 +/- 0.03)E-5 erg/cm^2. The 1-sec peak photon flux measured \nstarting from T0+46.5 s in the 10-1000 keV band \nis 5.8 +/- 0.2 ph/s/cm^2.\n\nA Band function fits the spectrum equally well \n(Cstat 871 for 600 d.o.f.) with Epeak= 162.60 (+21.60/-17.00) keV, \nalpha = -0.85 (+0.09/-0.09) and beta = -2.24 (+0.13/-0.21). \n\n\nThe spectral analysis results presented above are preliminary; \nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 10714,
  "createdOn": 1273006866000,
  "email": "david.tierney@ucd.ie",
  "subject": "GRB 100503A: Fermi GBM detection",
  "submitter": "David Tierney at UCD  <david.tierney@ucd.ie>",
  "eventId": "GRB 100503A"
}