[vsnet-grb-info 3278] Konus-Wind observation of GRB 060510A

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5113
SUBJECT: Konus-Wind observation of GRB 060510A
DATE:    06/05/11 13:39:12 GMT
FROM:    Valentin Pal'shin at Ioffe Inst  <val at mail.ioffe.ru>

S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and
T. Cline on behalf of the Konus-Wind team report:

The long GRB 060510A (Swift-BAT trigger #209351;
Krimm et al., GCN 5095; Barbier et al., GCN 5108)
triggered Konus-Wind at 27796.301 s UT (07:43:16.301).

As observed by Konus-Wind it had a duration of ~25 s,
fluence 2.55(-0.22,+0.07)x10^-5 erg/cm2,
and the 64-ms peak flux measured from T0+7.488 s
4.29(-0.72, +0.63)x10^-6  erg/cm2/s
(both in the 20 keV - 1 MeV energy range).
The burst shows a strong hard-to-soft spectral evolution.

Fitting the time-integrated spectrum of the burst
(from T0 to T0+24.064 s; in the 20 keV - 1 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ E^(-alpha)*exp(-E*(2-alpha)/Ep)
yields alpha = 1.661(-0.076, +0.072)
and Ep = 184 (-24, +36) keV (chi2 = 63/48 dof).

All the quoted errors are at the 90% confidence level.

The K-W light curve is available at
  http://www.ioffe.rssi.ru/LEA/GRBs/GRB060510_T27796/