[vsnet-grb-info 5851] GRB 080319B: TORTORA light curve

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7502
SUBJECT: GRB 080319B: TORTORA light curve
DATE:    08/03/21 19:54:17 GMT
FROM:    Sergey Karpov at SAO RAS  <karpov at 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 (Observatori Astronomic - Universitat de
Valencia Edificio de Institutos de Investigacion, Spain)

report on behalf of TORTOREM team:

Following GCN 7452 we publish a preliminary light curve of GRB 080319b with
reduced temporal resolution (10 frames time binning, 1.3 seconds effective
exposure, no gaps between frames). The photometry is performed in instrumental
system and calibrated towards the V magnitudes of nearby Tycho2 stars. The
light curve is available online at

http://vo.astronet.ru/~karpov/grb080319b_lc_10.gif

The light curve shows fast (~5 seconds) uprise towards the peak V=5.5 at T+23,
complex multi-peak structure till T+50 and featureless decay then. In total,
the transient has been visible for ~65 seconds; 6 seconds in the T+30 - T+36
interval are currently excluded from the analysis due to repointing of REM
telescope at that time.

The light curve is consistent with the one published by Pi of the Sky (Cwiok et
al, GCN 7445).

The video sequence of the data is available at

http://vo.astronet.ru/~karpov/grb080319b.avi

and with reduced temporal resolution at

http://vo.astronet.ru/~karpov/grb080319b_lowres.avi

The results of analysis of full-resolution (0.13s exposure) data will be
published later.