TITLE: GCN CIRCULAR NUMBER: 6132 SUBJECT: GRB 070223, Swift-BAT refined analysis DATE: 07/02/23 14:30:37 GMT FROM: Scott Barthelmy at NASA/GSFC G. Sato (GSFC/ISAS), 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), T. Sakamoto (GSFC/ORAU), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), L. Vetere (PSU) on behalf of the Swift-BAT team: Using the data set from T-240 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070223 (trigger #261664) (Vetere, et al., GCN Circ. 6125). The BAT ground-calculated position is RA, Dec = 153.453, 43.132 deg which is RA(J2000) = 10h 13m 48.6s Dec(J2000) = 43d 07' 55.4" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%. The mask-weighted lightcurve starts at ~T-20 sec and then rises to two main peaks at T+15 and T+35 sec with a long decaying profile out to T+150 sec. T90 (15-350 keV) is 89 +- 2 sec (estimated error including systematics). The time-averaged spectrum from T-3.4 to T+98.5 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.12. The fluence in the 15-150 keV band is 1.7 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+34.35 sec in the 15-150 keV band is 0.7 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The initial series of GCN Notices were delayed by ~460 sec because the trigger occurred during a Malindi telemetry downlink pass when the TDRSS messages are buffered on-board until the transmitter becomes available.