[AAVSO-HEN] GRB 080207: Optical limits from Gemini-South

[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:  7276
SUBJECT: GRB 080207:  Optical limits from Gemini-South 
DATE:    08/02/08 22:42:28 GMT
FROM:    Antonino Cucchiara at PSU  <cucchiara at astro.psu.edu>

A. Cucchiara and D. B. Fox (PSU) reports on behalf of a larger
collaboration:

"We have imaged the field of GRB 080207 (Racusin et al., GCN 7264)
with the Gemini South + GMOS in griz bandds starting at 0.41 days
after the trigger.

We took a sequence of 5x 180s images in each band (total exposure
900s).  Our co-added images do not reveal any source inside the XRT
refined error circle (Beardmore et al., GCN 7265).  Using three
objects from the SDSS catalog to establish photometric zero-points, we
calculate the following 2-sigma upper limits on the emission of any
optical afterglow + host galaxy: g > 24.1 mag, r > 24.5 mag, i > 24.2
mag, z > 25.0 mag."