GCN Circular 7631

A. Henden (AAVSO) reports:

While the field of GRB080310 has been observed by SDSS, we have also
obtained a four-night BVRcIc field calibration using the 35cm robotic
telescope at Sonoita Research Observatory.  The calibration file
has a limiting magnitude around V=17, with good standards brighter
than V=11 or so.  The file is available at
ftp://ftp.aavso.org/public/calib/grb/grb080310.dat

This calibration is based on numerous Landolt standards, and has
an external zeropoint error of about 0.02mag. Our system is available
for any other bright BVRI calibrations (4<V<19) for this field or any
other field; contact the author for such requests.

The AAVSO thanks the Curry Foundation for their continued support of the
AAVSO International High Energy Network, and to John Gross of SRO for
providing setup assistance for this field.