{
  "bibcode": "2017GCN.21776....1S",
  "body": "M. Stanbro (UAH), E. Bissaldi (Politecnico & INFN Bari)\nand C. Meegan (UAH) report on behalf of the Fermi GBM Team:\n\n\n\"At 03:14:01.95 UT on 30 August 2017, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 170830A (trigger 525755646 / 170830135).\nThis trigger is likely associated with the transient source\nreported by MAXI/GSC (Yoneyama et al., GCN 21761), which was also detected\nby AstroSat (Bhalerao et al., GCN 21773).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is\n\nRA = 275.9, DEC = -4.0,\n\nwith an uncertainty of 2.6 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which 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 100 degrees.\n\nThe GBM light curve shows two peaks\nwith a duration (T90) of about 110 s (50-300 keV).\nThe time-averaged spectrum from T0 to T0+92 s is\nadequately fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -1.54 +/- 0.07 and\nthe cutoff energy, parameterized as Epeak, is 180 +/- 40 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.20 +/- 0.11)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0 in the 10-1000 keV band\nis 4.6 +/- 0.4 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": 21776,
  "createdOn": 1504199068000,
  "email": "Elisabetta.Bissaldi@uibk.ac.at",
  "subject": "GRB 170830A: Fermi GBM observation",
  "submitter": "Elisabetta Bissaldi at U.Innsbruk/IAPP  <Elisabetta.Bissaldi@uibk.ac.at>",
  "eventId": "GRB 170830A"
}