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GCN Circular 18988

Subject
GRB 160131A: RATIR Optical Observations
Date
2016-02-04T16:54:53Z (8 years ago)
From
Nat Butler at Az State U <natbutler@asu.edu>
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William
H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier
Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI),
Eleonora Troja (GSFC), Owen Littlejohns (ASU), 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), Harvey Moseley (GSFC),
John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:

We observed the field of GRB 160131A (Page, et al., GCN 18951) 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 2016/02 4.10 to 2016/02 4.36 UTC (89.96 to
96.25 hours after the BAT trigger), obtaining a total of 4.60 hours
exposure in the r, i, and z bands.

For a source within the Swift-XRT error circle (Osborne, et al., GCN
18958), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the
following detections and upper limit (3-sigma):

  r = 21.64 +/- 0.05
  i = 21.41 +/- 0.03
  z > 20.48

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  We note that there is a faint,
possible source present in the DSS near this source which could be the GRB
host galaxy.

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