GCN Circular 11613
Subject
GRB 110128A: TAROT-Calern refined analysis
Event
Date
2011-01-28T15:49:13Z (15 years ago)
From
Bruce Gendre at ASDC <bruce.gendre@asdc.asi.it>
Laas-Bourez M. (UWA/ICRAR), Gendre B. (ASDC), Atteia J.L. (IRAP-OMP),
Klotz A. (IRAP-OMP), and Boer M. (OHP-OAMP) report:
following the detection of the optical afterglow by de Ugarte Postigo
et al. (GCN 11605), we re-analyzed the TAROT data reported in Klotz et
al. (GCN 11604). At the position of the afterglow, an object is
marginally detected (2.6 sigma confidence level) within the stack of
the first two images (73.7s -> 178.6s), with R = 18.0. A stack of the
following 4 images (193.7s -> 359.2s) gave only an upper limit of R <
18.7.
Combined with the NOT observation, this gives an optical decay index
of at least 1.6 during the initial part of the light curve, that could
indicate the presence of a reverse shock.
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
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