[vsnet-grb-info 10694] GRB 110708A: Liverpool Telescope observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12117
SUBJECT: GRB 110708A: Liverpool Telescope observations
DATE:    11/07/09 09:27:11 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi at fe.infn.it>

Z. Cano (Liverpool JMU), C. Guidorzi (U. Ferrara),
R.J. Smith (Liverpool JMU) report on behalf of a
large collaboration:

On 2011 July 08 at 04:46:10 UT the 2-m Liverpool Telescope
automatically began observing the INTEGRAL GRB 110708A
(Gotz et al., GCN Circ. 12112) using the gri filters,
corresponding to 168 s after the burst trigger time.

Inside the XRT error circle (D'Elia et al. GCN Circ. 12115)
we do not detect any uncatalogued source. In particular,
we do not detect the possible optical counterpart
mentioned by Perley et al. (GCN Circ. 12116) down to
the following limiting magnitudes:

Mid time from    Total Exp   Filter    Magnitude
trigger (min)    (s)
------------------------------------------------
20.1               30        i > 20.1
34.7              300        i > 20.4
33.0              360        r > 21.2
------------------------------------------------

Magnitudes have been calibrated from the nearby USNOB-1
star 1439-0418943 (RA=340.114656, Dec=+53.964514,
R2=16.51 mag, I=15.85 mag).