[vsnet-grb-info 10409] GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11846
SUBJECT: GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations
DATE:    11/03/30 21:38:38 GMT
FROM:    Andrew Levan at U.of Leicester  <A.J.Levan at warwick.ac.uk>

A.J. Levan (U. Warwick), N.R. Tanvir (U. Leicester), A. Morgan, 
J. Bloom, S.B. Cenko (U.C. Berkeley) report for a larger collaboration:

"We obtained IR observations of GRB 110328A using both UKIRT/WFCAM
and Gemini-N/NIRI on 30 March 2011, beginning at ~13:00 UT.
Observations were obtained in J and H with UKIRT and in K with NIRI.
The source is detected in all filters, and confirms the very red
colour of the counterpart suggested by Morgan et al (GCN 11845).

Comparison of these images with those taken with PAIRITEL provides
maginal evidence for brightening between the PAIRITEL observations
and those obtained with UKIRT and Gemini. Formally Delta_K = 0.52
+/- 0.21 and Delta_H = 0.73 +/- 0.35 mag. However, we caution that
the difference between instruments, coupled with slightly different
filter responses, may impact these results, and hence at present we
cannot establish variability with high confidence.

Further observations are planned"