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GCN Circular 21959

Subject
GRB 171001A: RATIR Optical and NIR Observations
Date
2017-10-02T15:46:07Z (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 (U. Wash.), and Vicki Toy (UMD) report:

We observed the field of GRB 171001A (Lien, et al., GCN 21946) 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 2017/10 2.17 to 2017/10 2.51 UTC (9.63 to
17.69 hours after the BAT trigger), obtaining a total of 5.31 hours
exposure in the r and i bands and 2.24 hours exposure in the Z, Y, J, and H
bands.

We do not detect a source within the XRT error region (Evans, et al., GCN
21952) or at the position of the Nanshan optical transient (Tan, et al.,
GCN 21957).  In comparison with the USNO-B1 and 2MASS catalogs, we obtain
the following upper limits (3-sigma):

 r > 24.15
 i > 23.98
 Z > 22.96
 Y > 22.77
 J > 22.43
 H > 22.03

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.
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