TITLE: GCN CIRCULAR NUMBER: 10171 SUBJECT: GRB 091117A Detected in ground analysis of BAT data and IPN triangulation DATE: 09/11/18 20:41:05 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/CRESST), V. Pal'shin (Ioffe Inst.), K. Yamaoka (Aoyama Gakuin U.), P. Evans (U. Leicester) on behalf of the Swift-BAT, Konus-Wind, and Suzaku-WAM teams The Suzaku WAM alerted the IPN to a short hard burst that occurred at 17:44:29 UT on November 17th. The burst was seen in detector rates with Suzaku, Konus-Wind, INTEGRAL SPI ACS, and Swift-BAT. A source was found in ground analysis of BAT data (trigger 376211) at 12% coding. The BAT ground position was RA, Dec 30.945, -16.944, which is RA (J2000) 02h 03m 46.9s Dec (J2000) -16d 56' 38.0" with an estimated 90% containment radius of 2.6 arcmin. As seen in BAT, the burst had a weak precursor at T0, and the main spike at T+2.7 sec. The precursor was about 0.12 sec and the main spike was about 0.4 seconds long. The BAT peak count rate was about 700 counts/0.064 sec in the 15-350 keV band. There is an AGN 2.5 arcmin from this position, 2MASX J02035665-1656585 at z = 0.092. The BAT position is inside the error box of a triangulation performed using Konus-Wind, BAT, Suzaku-WAM, and INTEGRAL-SPI-ACS data. A Swift TOO observation has been requested and approved.