[vsnet-grb-info 8255] GRB 090812: WIRO NIR upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9780
SUBJECT: GRB 090812: WIRO NIR upper limit
DATE:    09/08/12 20:06:03 GMT
FROM:    Jay Norris at U. of Denver  <jaypnorris at gmail.com>

Alexander Kutyrev (CRESST/UMCP/GSFC), Jay Norris (U. Denver),
report on behalf of the Goddard/U. Wyoming NIR camera collaboration.

We observed the afterglow position of GRB 090812 as reported by Cenko
(GCN Circ. 9769) with the 2.3-meter WIRO telescope and the Goddard
NIR camera, commencing 10:28 UT, 4.4 hrs after the Swift trigger
(Stamatikos et al., GCN Circ. 9768).

Using stacked J-band images with a total exposure time of 1360 s,
via comparison with two adjacent 2-MASS stars, we derive the following
3 sigma upper limit for the afterglow:

       Tmid (UT)    Mag

        10:46     J-band > 21.2