[vsnet-grb-info 10082] GRB 110106B: Liverpool Telescope observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11537
SUBJECT: GRB 110106B: Liverpool Telescope observations
DATE:    11/01/07 11:12:06 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi at fe.infn.it>

C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB),
I.A. Steele, C.G. Mundell, S. Kobayashi (Liverpool JMU),
A. Gomboc (U. Ljubljana) on behalf of a large collaboration report:

The 2-m Liverpool Telescope automatically began observing
GRB 110106B (Sbarufatti et al. GCN Circ. 11525) on January 06,
21:35:46 UT, 9.5 minutes from the GRB trigger time with the
SDSS filters riz.
Within the enhanced XRT error circle (Beardmore et al. GCN Circ. 11532)
we do not find any source down to the following limiting magnitudes.

Mid time from      Tot Exposure    Filter   Limiting Magnitude
trigger (s)           (s)
------------------------------------------------------------
2594                  720           z > 20.4
2300                  720           i > 21.4
2620                 1260           r > 22.5
------------------------------------------------------------

Calibration is against some nearby SDSS stars.
The non-detection of the extended object mentioned by Levan et
al. (GCN Circ. 11534) with i~22.5 is consistent with our limit.