TITLE: GCN CIRCULAR NUMBER: 11879 SUBJECT: GRB 110402A: Konus-Wind spectral lags and detailed energetics DATE: 11/04/04 17:05:29 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks and D. Svinkin on behalf of the Konus-Wind team, report: 1. The further analysis of the Konus-Wind detection (GCN 11869) of GRB 110402A (GCN 11857, 11866) confirms the zero spectral lag in the initial hard pulse reported with the Swift-BAT data (Barthelmy and Norris, GCN 11870). The following lag values between the Konus-Wind light curves are obtained: ------------------------------------------------------------- LC1(keV) LC2(keV) Search Interval(s) Scale Lag(ms) ------------------------------------------------------------- G2(70-300) G1(18-70) -0.512:+0.320 8 ms +3.5 ± 12.5 G3(300-1160) G1(18-70) -0.512:+0.280 8 ms +3.2 ± 12.3 G3(300-1160) G2(70-300) -0.340:+0.320 4 ms -0.3 ± 4.8 ------------------------------------------------------------- The errors are given on 1 sigma level. 2. The total burst fluence S=(1.6 ± 0.5)x10-5 erg/cm2 reported in GCN 11869 is divided between the hard initial pulse and the softer extended emission as follows: T0(-0.512 : +2.816) -> S1=(5.7 ± 1.9)x10-6 erg/cm2 (initial pulse) T0(2.816 : +65.792) -> S2=(9.9 ± 2.9)x10-6 erg/cm2 (extended emission) The K-W spectrum of the latter part (measured from T0+8.448s to T0+65.792s) can be fitted in the 20-5000 keV range by the simple power law function with the index of (1.81 ± 0.13), chi2 = 93.4/78 The errors are given on 90% confidence level. All times are given relative to K-W T0=781.989s UT.