TITLE:   GCN CIRCULAR
NUMBER:  16914
SUBJECT: GRB 141015A: RATIR Optical Upper Limits
DATE:    14/10/15 18:40:51 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), Jos�� A. de Diego (UNAM), Leonid
Georgiev (UNAM), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM),
Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:

We observed the field of GRB 141015A (Troja, et al., GCN 16909) with the
Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the
1.5m Harold Johnson Telescope at the Observatorio Astron��mico Nacional on
Sierra San Pedro M��rtir from 2014/10 15.39 to 2014/10 15.53 UTC (0.05
to 3.59 hours after the BAT trigger), obtaining a total of 2.44 hours
exposure in the r and i bands.

For a source within the Swift/XRT error circle (Troja, et al., GCN 16910),
we obtain the following upper limits (3-sigma):

  r     > 23.07
  i     > 22.48

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.

We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.