GCN Circular 20595
Subject
GRB 170202A: RATIR Optical and NIR Observations
Event
Date
2017-02-03T16:56:06Z (8 years ago)
From
Nat Butler at UC berkeley <natxbutler@gmail.com>
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), Neil Gehrels (GSFC), Harvey
Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy
(UMD) report:
We observed the field of GRB 170202A (Racusin, et al., GCN 20575) 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 2017/02 3.18 to 2017/02 3.57 UTC (9.92 to
19.17 hours after the BAT trigger), obtaining a total of 3.98 hours
exposure in the r and i bands and 1.68 hours exposure in the Z and Y bands.
For a source within the Swift-XRT error circle (Osborne, et al., GCN
20586), in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the
following detections:
r = 20.68 +/- 0.01
i = 20.83 +/- 0.02
Z = 20.84 +/- 0.07
Y = 20.50 +/- 0.06
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.