[AAVSO-HEN] GRB 090515: MMT/MMIRS NIR Upper Limit

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  9370
SUBJECT: GRB 090515: MMT/MMIRS NIR Upper Limit
DATE:    09/05/15 22:59:17 GMT
FROM:    Grant Williams at Steward Observatory  <ggwilli at gmail.com>

B. McLeod (CfA), G. Williams (MMTO) on behalf of the MMIRS
commissioning team report:

We observed the field of GRB 090515 (Beardmore et al. 2009, GCN 9356)
with the MMIRS instrument on the 6.5-m MMT telescope.  Observations
began at 06:44 UT, approximately 119 minutes after the Swift trigger.
We obtained 27 x 30 second exposures in the K-band.  We do not detect
any afterglow candidate in the XRT error circle in the combined image
to the following 5-sigma limiting magnitude determined using nearby
2MASS stars:

t_start (UT)     exp t (s)     t_start-t_0     Limit
-----------------------------------------------------------
06:44        27x30              119 min      K > 19.3