TITLE: GCN CIRCULAR NUMBER: 12800 SUBJECT: Konus-Wind observation of GRB 120102A DATE: 12/01/03 13:53:11 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long GRB 120102A (Swift-BAT trigger=510922: Marshall et al., GCN 12794; Markwardt et al., GCN 12799) triggered Konus-Wind at T0=8181.530 s UT (02:16:21.530). The burst light curve shows a single pulse with a duration of ~15 s. There is a weak precursor marginally seen at ~T0-30 s. As observed by Konus-Wind the burst had a fluence of 1.75(-0.26,+0.30)x10^-5 erg/cm2, and a 256-ms peak flux measured from T0+3.536 s of 5.56(-1.02, +1.12)x10^-6 erg/cm2/s (both in the 20 keV - 4 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+16.640 s) is well fitted (in the 20 keV - 4 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with alpha = -1.47(-0.07, +0.09), and Ep = 805(-180, +288) keV (chi2 = 68.4/73 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and only an upper limit on the high energy photon index: beta < -2.04. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120102_T08181/