TITLE: GCN CIRCULAR NUMBER: 5725 SUBJECT: GRB 061007: RHESSI Spectral Fit DATE: 06/10/09 22:36:02 GMT FROM: Eric Bellm at UCB/SSL C. Wigger, E. Bellm, M. Bandstra, S. Boggs, W. Hajdas, D. M. Smith, and K. Hurley on behalf of the RHESSI team report: As observed by RHESSI, GRB061007 (Schady et al., GCN 5707; Markwardt et al., GCN 5713) had a duration of ~73s starting at about T0=10:08:08 UT. The preliminary fit to the time-integrated RHESSI spectrum of the main period of emission from (T0+27s) - (T0+64s) between 34 keV and 6 MeV is a Band function with alpha = -0.90 +0.27/-0.23 beta = -3.07 +0.40/-1.68 Epeak = 391 +58/-52 keV (90% confidence levels). The 20 keV-10 MeV fluence is 1.85 +0.12/-0.10 E-4 erg/cm^2.