TITLE: GCN CIRCULAR NUMBER: 6025 SUBJECT: RHESSI Spectrum of GRB070125 DATE: 07/01/26 00:47:31 GMT FROM: Eric Bellm at UCB/SSL E. Bellm, M. Bandstra, S. Boggs, C. Wigger, W. Hajdas, D. M. Smith, and K. Hurley on behalf of the RHESSI team report: As observed by RHESSI, GRB070125 (Hurley et al., GCN 6024) had a duration of ~70s starting at about T0=07:20:42 UT. The preliminary fit to the time-integrated RHESSI spectrum from T0 - T0+69s between 30 keV and 10 MeV is a cutoff power law with alpha = -1.33 +0.11/-0.09 E0 = 1450. +710/-450. keV Epeak = 980. +/-300. keV (90% confidence levels). The 30 keV-10 MeV fluence is 1.5 E-4 erg/cm^2. The RHESSI data show two main periods of GRB emission. The first, from T0 - T0+13s, had a fluence of 4.6 E-5 erg/cm^2 and an Epeak of 950 +/-300 keV. A second, multi-peaked emission period occurred from T0+30s - T0+50s and had a fluence of 7.2 E-5 erg/cm^2 and an Epeak of 675 +/-175 keV.