[AAVSO-HEN] GRB 091202: Liverpool Telescope observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  10241
SUBJECT: GRB 091202: Liverpool Telescope observations
DATE:    09/12/03 15:15:05 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi at fe.infn.it>

C. Guidorzi (U. Ferrara), C.G. Mundell, D. Bersier, Z. Cano,
N.R. Clay, S. Kobayashi, A. Melandri, C.J. Mottram, R.J. Smith,
I.A. Steele (Liverpool JMU), A. Gomboc (U. Ljubljana) report
on behalf of a large collaboration:

On 2009 December 3 at 00:11:21 UT the 2-m Liverpool Telescope
automatically began observing the INTEGRAL GRB 091202
(Mereghetti et al., GCN Circ. 10234; Mundell GCN Circ 10235)
using the r', i' and z' filters, corresponding to 1.02 hours
after the burst.

Inside the XRT error circle (Vetere et al. GCN Circ. 10239)
we do not detect any source at the following limiting
magnitudes:

Mid time from    Total Exp   Filter    Magnitude
trigger (hr)     (s)
------------------------------------------------
1.48             360         z'        > 19.0
1.61             720         i'        > 20.7
1.49             720         r'        > 20.4
------------------------------------------------

Magnitudes have been calibrated from the following nearby
SDSS stars:

RA            Dec         z'       i'      r'
-----------------------------------------------
138.81006    +62.53208   15.16    15.24   15.41
138.82579    +62.53708   18.73    18.73   18.90
-----------------------------------------------