GCN Circular 4857
Subject
GRB 060306: SOAR Ks Observations
Event
Date
2006-03-10T20:39:30Z (20 years ago)
From
Melissa Nysewander at UNC,Chapel Hill <mnysewan@physics.unc.edu>
M. Nysewander, D. Reichart, A. Oliveira, P. Ugarte, and A. Alvarez report
on behalf of the UNC team of the FUN GRB collaboration:
We observed the localization of GRB 060306 (Angelini et al., GCN 4848) with
the SOAR infrared imager, OSIRIS, beginning at 00:31:56 UT on March 7th,
1.0 days after the burst. We detect no new source down to a 3-sigma
limiting magnitude of Ks = 18.2 based on six stars from the 2MASS
catalogue.
If one assumes minimal extinction in the Ks band and uses the extrapolated
to 24 hours, unabsorbed X-ray flux of Page et al. (GCN 4850), this suggests
a NIR to X-ray spectral index that is shallower than -0.7.
The source in the XRT error circle which is also in the DSS-Red plate (as
noted by Price et al., GCN 4854) is at Ks = 17.3 +/- 0.2 mag.
SOAR is currently being commissioned.