[vsnet-grb-info 4255] GRB 070125: further AAVSO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6051
SUBJECT: GRB 070125: further AAVSO optical observations
DATE:    07/01/29 14:54:17 GMT
FROM:    AAVSO GRB Network at AAVSO  <aavso at aavso.org>

D.T. Durig (Cordell-Lorenz Observatory, University of the South)
reports on behalf of the AAVSO International High Energy Network
on further optical observations of GRB070125 (GCN #6024, Hurley
et al.):

D.T. Durig reports the following unfiltered (CR) magnitude:

2007 Jan 29, 07:39:56 UT: 21.5 (CR)

Note that this is a marginal detection, with an estimated SNR
of 3.1.

Details of these observations are available from the AAVSO at
ftp://ftp.aavso.org/grb , and full details of the observation
are available at the following URL:

http://www.aavso.org/pipermail/aavso-hen/2007-January/006947.html

-----------------------------

Observer: D. T. Durig (CLW01)

Report: I had to stack 148 images, but I finally got the SNR to 3.1. I
could clearly see it in stacks of 60, 90 and 120 but the SNR was only
between 2.5 and 2.8. I lost two images to wind, so only added the best
148 frames.  Position 07 51 17.70 +31 09 04.3 GIF image posted to
http://arthur.sewanee.edu/obsv/view.php