[AAVSO-HEN] GRB 070704 : 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:  6602
SUBJECT: GRB 070704 : Liverpool Telescope Observations
DATE:    07/07/06 12:50:15 GMT
FROM:    Andrea Melandri at Liverpool John Moores U  <axm at astro.livjm.ac.uk>

A. Melandri (Liverpool JMU), E. Rol, N. Tanvir (U. Leicester)
report on behalf of the RoboNet GRB collaborationon:


We observed the field of GRB 070704 (trigger=283791, Sakamoto
et al., GCN 6594) with the 2-m Liverpool Telescope about 4.2
hours after the trigger time.

At the revised XRT position (Godet & Sakamoto, GCN 6598) we do
not detect any new object in stacked images down to:


Filter    t_mid (hr from GRB)    Tot_Exp (s)       Lim
--------------------------------------------------------------
   r'           4.26                 1800           23.0
   i'           5.10                 1800           23.3
--------------------------------------------------------------


Magnitudes were calibrated vs R2 and I USNO-B1 magnitude for
few selected stars.