TITLE: GCN CIRCULAR NUMBER: 13429 SUBJECT: GRB 120709A: Fermi GBM detection DATE: 12/07/10 23:19:36 GMT FROM: Sylvain Guiriec at UAH Sylvain Guiriec (GSFC), Valerie Connaughton (UAH) and Michael Briggs (UAH) report on behalf of the Fermi GBM Team: "At 21:11:40.37 UT on 09 July 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120709A (trigger 120709883 / 120709.883). The on-ground calculated location, using the GBM trigger data, is RA = 320.02, DEC = -47.87 (J2000 degrees, equivalent to 21h20m04, -47d52'12), with an uncertainty of 1.70 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 22 degrees. The burst was also seen by the LAT (Kocevski et al., GCN 13423) The GBM light curve consists of 3 intense peaks with a duration (T90) of about 30 s (50-300 keV). The time-averaged spectrum from T0 s to T0+41s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.22 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 449 +/- 55 keV The event fluence (10-1000 keV) in this time interval is (1.43 +/- 0.04)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+11.65 s in the 10-1000 keV band is 11.4897 +/- 0.2869 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."