TITLE:   GCN CIRCULAR
NUMBER:  17437
SUBJECT: GRB 150211A: RATIR Optical and NIR Observations
DATE:    15/02/11 13:41:02 GMT
FROM:    Owen Littlejohns at Az State U  <olittlej@asu.edu>

Owen Littlejohns (ASU), Nat Butler (ASU), Alan M. Watson (UNAM),
Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer
(UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska
(UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora
Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM),
Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga
(UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:

We observed the field of GRB 150211A (Starling, et al., GCN 17434)
with the Reionization and Transients Infrared Camera (RATIR;
www.ratir.org) on the 1.5m Harold Johnson Telescope at the
Observatorio Astronómico Nacional on Sierra San Pedro Mártir from
2015/02 11.50 to 2015/02 11.53 UTC (0.05 to 1.29 hours after the
BAT trigger), obtaining a total of 1.07 hours exposure in the r, i
and z bands.

For a source within the Swift-XRT error circle (Campana, et al.,
GCN 17435), in comparison with USNO-B1 and 2MASS, we obtain the
following upper limits (3-sigma):

  r     > 23.34
  i     > 23.71
  z     > 20.21

These magnitudes are in the AB system and are not corrected for
Galactic extinction in the direction of the GRB. These upper
limits are consistent with observations by the Swift-UVOT (Chester,
et al, GCN 17436) and MASTER II robotic telescope (Ivanov, et al,
GCN 17433).

We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.