GCN Circular 12047
J. Michael Burgess (UAH) and Sylvain Guiriec (UAH) report on behalf of the Fermi GBM Team: "At 00:48:42.87 UT on 29 May 2011, the Fermi Gamma-Ray Burst Monitor triggered and located the very bright and short GRB 110529A (trigger 110529034 / 110529034). The on-ground calculated location, using the GBM trigger data, is RA = 118.33, DEC = 67.91 (J2000 degrees, equivalent to 7h 53m, +67d 54'), with an uncertainty of 1.5 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 30 degrees. This GRB was also observed by Konus-Wind (GCN 12045). The GBM light curve consists of two short bright peaks with a duration (T90) of about 0.41s (50-300 keV). The time-averaged spectrum from T0-0.0 s to T0+.44s is adequately fit by a Band function with Epeak = 1161 +/- 265 keV, alpha = -0.88 +/- 0.06, and beta = -2.05+/- 0.15 The event fluence (10-1000 keV) in this time interval is (2.32 +/- 0.01)E-6 erg/cm^2. The 0.256-sec peak photon flux measured starting from T0+0.00 s in the 10-1000 keV band is 23.6826 +/- 0.68 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."