TITLE: GCN CIRCULAR NUMBER: 7549 SUBJECT: GRB 080330, Swift-BAT refined analysis DATE: 08/03/30 16:39:37 GMT FROM: Scott Barthelmy at NASA/GSFC C. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), J. Mao (INAF-OAB), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. 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 080330 (trigger #308041) (Mao, et al., GCN Circ. 7537). The BAT ground-calculated position is RA, Dec = 169.278, 30.607 deg, which is RA(J2000) = 11h 17m 06.7s Dec(J2000) = +30d 36' 24.1" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%. The mask-weighted light curve shows an initial set of 3 overlapping peaks (the brightest first) starting at ~T_zero, and the 3rd ending at ~T+15 sec, then it returns to baseline. A 4th peak starts at roughly T+50 sec and ends at roughly T+70 sec. T90 (15-350 keV) is 61 +- 9 sec (estimated error including systematics). The time-averaged spectrum from T-0.5 to T+71.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.53 +- 0.45. The fluence in the 15-150 keV band is 3.4 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.44 sec in the 15-150 keV band is 0.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/308041/BA/ We note that the fluence ratio in a simple power-law fit between the 25-50 keV band and the 50-100 keV band is 1.44. This fluence ratio is larger than 1.32 which can be achieved in the Band function of alpha=-1.0, beta=-2.5, and Epeak=30 keV. Thus, preliminary analysis shows that Epeak of the burst is very likely around or below 30 keV. Therefore the burst can be classified as an X-ray flash (e.g. Sakamoto et al. ApJ in press, arXiv:0801.4319).