GCN Circular 11863
Subject
GRB 110402A: further NOT observations
Event
Date
2011-04-02T08:44:59Z (15 years ago)
From
Giorgos Leloudas at Dark Cosmology Centre <giorgos@dark-cosmology.dk>
G. Leloudas (DARK/NBI), D. Xu (WIS), J. Hjorth (DARK/NBI), P.
Jakobsson (U. Iceland), M. Bayliss (U. Chicago/KICP), report on behalf
of a larger collaboration:
We re-observed the field of GRB 110402A (Ukwatta et al., GCN 11857)
with the Nordic Optical Telescope (La Palma, Spain) equipped with
MOSCA. We obtained two more 600 s R-band exposures starting at 02:38
UT and 04:24 UT.
In the table below we summarize all photometry obtained at the NOT,
where we have also re-calibrated the photometry in Leloudas et al.
(GCN 11859) based on several USNO B1.0 stars in the field:
t_start (min) R (mag)
83.1 21.15 +- 0.06
96.6 21.10 +- 0.08
145.5 21.10 +- 0.06
251.6 21.50 +- 0.07
The source has faded significantly between our last two observations
confirming its transient nature.