TITLE: GCN CIRCULAR NUMBER: 6656 SUBJECT: GRB 070724, Swift-BAT refined analysis of a short burst DATE: 07/07/24 15:31:04 GMT FROM: Ann M. Parsons at NASA/GSFC/Swift A. Parsons (GSFC), L. Barbier (GSFC), S.D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU), H. Ziaeepour (UCL-MSSL) (i.e. the Swift-BAT team): Using the data set from T-310 to T+ 310 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070724 (trigger #285948) (Ziaeepour, et al., GCN Circ. 6654). The BAT ground-calculated position is RA, Dec = 27.824, -18.610 deg which is RA(J2000) = 1h 51m 17.9s Dec(J2000) = -18d 36' 35" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 91%. The mask-weighted light curve for GRB 070724 consists of a single spike peaking at T+0.2 sec. Upon inspection of the mask weighted light curve out to T + 310 sec we find no evidence for extended emission. T90 (15-350 keV) is 0.4 +- 0.04 sec (estimated error including systematics). The time-averaged spectrum from T-0.0 to T+0.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.81 +- 0.33. The fluence in the 15-150 keV band is 3.0 +- 0.7 x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.30 sec in the 15-150 keV band is 1.0 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.