TITLE:   GCN CIRCULAR
NUMBER:  7558
SUBJECT: GRB 080319B: TORTORA light curve (Correction)
DATE:    08/04/01 11:21:31 GMT
FROM:    Sergey Karpov at SAO RAS  <karpov@sao.ru>

S. Karpov, G. Beskin (SAO RAS, Russia), S. Bondar (RIPI, Russia), C. Bartolini,
G. Greco, A. Guarnieri, A. Piccioni (Astronomy Department of Bologna
University, Italy), D. Nanni, F. Terra (Second University of Roma "Tor
Vergata", Italy), E. Molinari, G. Chincarini, F.M. Zerbi, S. Covino, V. Testa
(Osservatorio Astronomico di Brera, Italy), G. Tosti (Universita di Perugia,
Italy), F. Vitali, L.A. Antonelli (Osservatorio Astronomico di Roma, Italy),
P. Conconi, G.  Cutispoto (Osservatorio Astronomico di Catania, Italy),
G. Malaspina (Osservatorio Astronomico di Brera, Italy), L. Nicastro (Istituto
di Astrofisica Spaziale e Fisica Cosmica, Palermo, Italy), E. Palazzi (Istituto
di Astrofisica Spaziale e Fisica Cosmica, Bologna, Italy), E. Meurs (Dunsink
Observatory, Ireland), P.  Goldoni (APC, SAp/CEA, Paris)

report on behalf of TORTOREM team:

We performed additional analysis of Tortora data on early optical
transient of GRB 080319B (GCN 7427, Racusin et al.)  reported by us in
GCN 7502 and found the systematic error of 6.1 s in the time zero
point. To compensate it, all data points have to be shifted 6.1 s to
earlier times. The modified light curve, also including minor
photometric adjustments, is available at

http://vo.astronet.ru/~karpov/grb080319b_lc_10_shifted.gif

We apologize for any inconvenience this may have caused.