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GCN Circular 20915

Subject
GRB 170318A: RATIR Optical and NIR Observations
Date
2017-03-18T22:08:37Z (7 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 (UVI), Eleonora
Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes��s
Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey Moseley (GSFC), John
Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:

We observed the field of GRB 170318A (Sbarufatti, et al., GCN 20904) 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 2017/03 18.51 to 2017/03 18.53 UTC (3.0 to
27.6 minutes after the BAT trigger), obtaining a total of 0.24 hours
exposure in the r and i bands and 0.11 hours exposure in the Z, Y, J, and H
bands.

We do not detect a source within the Swift-XRT error circle (Evans, et al.,
GCN 20907).  In comparison with the USNO-B1 and 2MASS catalogs, we obtain
the following upper limits (3-sigma):

 r > 23.39
 i > 22.82
 Z > 21.72
 Y > 21.56
 J > 21.12
 H > 20.73

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  We note that this field suffers
large Galactic extinction (A_V~3).

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