[AAVSO-HEN] GRB 070612A: MDM 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:  6526
SUBJECT: GRB 070612A: MDM Observations
DATE:    07/06/13 04:38:28 GMT
FROM:    Nestor Mirabal at Columbia U  <mirabal at astro.columbia.edu>

N. Mirabal, I. D. McGreer, J. P. Halpern (Columbia U.),
M. Dietrich, B. M. Peterson (Ohio State U.) report on
behalf of the MDM GRB follow-up team:

"We observed the candidate optical afterglow of Swift
GRB 070612A (Updike et al. GCN 6515, Cenko et al.
GCN 6525) using the MDM 2.4m telescope. Preliminary
calibration with respect to USNO magnitudes
of nearby stars yields r' ~ 19.0 +/- 0.3 on June 13 03:59 UT
and i' ~ 18.4 +/- 0.2 on June 13 03:49 UT respectively.
These measurements indicate that the afterglow
has faded with respect to previous reports."