TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3316 SUBJECT: GRB 050422: Swift-BAT refined analysis DATE: 05/04/22 15:31:54 GMT FROM: Louis M Barbier at NASA/GSFC/Swift M. Suzuki (Saitama), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), J. Cannizzo (GSFC/UMBC), M. Ajello (MPE), M. Chester (PSU) on behalf of the Swift/BAT team: At 07:52:39 UT Swift-BAT detected GRB 050422 (trigger= 115214) (GCN Circ 3314, Barbier et al.). The refined BAT ground position is (RA,Dec) = 324.454, 55.798, [deg; J2000] +- 3 arcmin, (95% containment). The partial coding was 98%. The light curve shows multiple peaks, with the main peak starting about T+42 seconds after the trigger and with another hard peak at T+102 seconds. T90 (15-350 keV) is (59.2 +- 0.3) seconds (estimated error including systematics). The photon index of the time-averaged spectrum is 1.4 +- 0.2. The fluence in the 15-350 keV band is (1.2 +- 0.2) x 10^-6 erg/cm2. The 1-s peak photon flux measured from T0+53.1 seconds in the 15-350 band is (0.7 +- 0.1 ) ph/cm2/s. All the quoted errors are at the 90% confidence level.