GCN Circular 2642
Subject
GRB040812, optical/IR observations
Event
Date
2004-08-13T18:06:44Z (22 years ago)
From
Charles Bailyn at Yale/Astro <bailyn@astro.yale.edu>
B. E. Cobb and C. D. Bailyn (Yale), part of the larger SMARTS
consortium, report:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained optical/IR imaging of the error region of GRB 040812
(Gotz et al. GCN 2640) beginning ~18.4 hours post-burst
(2004-08-13 00:25 UT). Optical imaging in B,V,R and I has a
field of view of 6'x6' and, therefore, covers the entire GRB
error circle. IR imaging in J, H, K and Y has a smaller field
of view and covers a region totalling 3 square arcminutes in
the middle of the quoted error region. Several dithered images
were obtained in each filter, with total summed exposure times
of 180s in each of BRIYJK and 120s in each of H and V.
Preliminary visual comparison of the optical images to the SDSS
and the IR images to 2MASS frames does not reveal any new sources
to the limit of the comparison frames.