TITLE: GCN CIRCULAR NUMBER: 6141 SUBJECT: GRB 070224, Swift-BAT refined analysis DATE: 07/02/25 00:34:25 GMT FROM: Scott Barthelmy at NASA/GSFC J. Tueller (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), A. Parsons (GSFC), J. L. Racusin (PSU), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU) on behalf of the Swift-BAT team: Using the data set from T-239 to T+482 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070224 (trigger #261880) (Racusin, et al., GCN Circ. 6137). The BAT ground-calculated position is RA, Dec = 178.987, -13.356 deg which is RA(J2000) = 11h 55m 57.0s Dec(J2000) = -13d 21' 20.1" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted lightcurve shows two overlapping peaks starting at ~T-20 sec and decaying back to background at ~T+50 sec. T90 (15-350 keV) is 34 +- 1 sec (estimated error including systematics). The time-averaged spectrum from T-13.8 to T+24.3 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.42 +- 0.30. The fluence in the 15-150 keV band is 3.1 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-13.76 sec in the 15-150 keV band is 0.3 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.