GRB 170514A: Fermi GBM detection
Abstract
"At 04:18:38.88 UT on 14 May 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170514A (trigger 516428323 / 170514180). The on-ground calculated location, using the GBM trigger data, is RA, Dec = 122.10, -25.30 (J2000 degrees, equivalent to 08h 08m, -25d 18'), with an uncertainty of 2.2 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error [Connaughton et al. 2015, ApJS, 216, 32]). The angle from the Fermi LAT boresight at the GBM trigger time is 58 degrees. The GBM light curve shows two distinct emission episodes with a duration (T90) of about 104 s (50-300 keV). The time-averaged spectrum from T0 s to T0+30 s and from T0+75 s to T0+100 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.53 +/- 0.02 and the cutoff energy, parameterized as Epeak, is 150 +/- 7 keV. The event fluence (10-1000 keV) in this time interval is (2.26 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+83.4 s in the 10-1000 keV band is 13.0 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
- Publication:
-
GRB Coordinates Network
- Pub Date:
- May 2017
- Bibcode:
- 2017GCN.21094....1B