[vsnet-grb-info 3990] GRB 061110B: NOT optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5807
SUBJECT: GRB 061110B: NOT optical observations
DATE:    06/11/11 01:02:28 GMT
FROM:    Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr  <cthoene at astro.ku.dk>

Christina C. Thoene, Daniele Malesani, Johan P. U. Fynbo (DARK Cosmology
Centre), Christina Henriksen (DARK, NOT) and Dimitri Sharapov (NOT)
report:

We observed the OT of GRB061110B (GCN 5804) starting Nov. 10, UT 23:20 (1h
after the burst), with ALFOSC at the NOT on La Palma in R and i.

>From two sets of 3x300s stacked images, we determined magnitudes of R=22.0
and i=21.5 using preliminary photometric zeropoints from the NOT webpages.
Compared to the R-band magnitude reported in GCN 5804, the OT has faded
with a temporal decay index of alpha~2.3.