[vsnet-grb-info 18932] GRB 170111A: SMARTS optical/IR observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20432
SUBJECT: GRB 170111A: SMARTS optical/IR observations
DATE:    17/01/11 20:41:35 GMT
FROM:    Bethany Cobb at GWU  <bcobb at gwu.edu>

B. E. Cobb (GWU) reports:

Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained optical/IR imaging of the error region of GRB 170111A
(GCN 20423, Beardmore et al.) with a mid-exposure time of about
1 hour post-burst (2017-01-11 01:36 UT). Total summed exposure
times amounted to 36 minutes in I and 30 minutes in J.

No source is detected at the position of the X-ray
afterglow (GCN 20424, Evans et al.) in either I or J,
to an approximate 3-sigma limiting magnitude of I > 21.9
(calibrated using USNO-B1.0 stars).