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GCN Circular 14334

Subject
GRB 130327A: RATIR Optical and NIR Observations
Date
2013-03-27T04:56:14Z (11 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), Chris Klein (UCB),
Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino
Cucchiara (UCSC), 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 130327A (Ukwatta, et al., GCN 14331) 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 2013/03 27.12 to 2013/03
27.17 UTC (1.16 to 2.17 hours after the BAT trigger), obtaining a
total of 0.82 hours exposures in the r' and i' bands and 0.35 hours of
exposure in the Z, Y, J, and H bands.

We detect one uncatalogued source within the XRT error region (GCN
14331), at a position RA , DEC: = 92.03875,  55.71504 (+/-0.5 ",
J2000).  This is 2.7" from the center of the XRT error circle.  In
comparison with USNO-B1 and 2MASS, we derive the following detections
and upper limit (3-sigma) in the AB magnitude system:

r'    21.22 +/- 0.10
i'    21.17 +/- 0.09
Z    20.09 +/- 0.14
Y    19.98 +/- 0.17
J    19.98 +/- 0.23
H     > 20.08

We also detect a second uncatalogued source just outside the XRT error
circle (3.9" from the center) at RA , DEC: 92.03822,  55.71326 (+/-0.5
", J2000):

r'    21.61 +/- 0.14
i'    20.36 +/- 0.05
Z    19.15 +/- 0.06
Y    18.72 +/- 0.06
J    18.70 +/- 0.07
H    18.53 +/- 0.09

We note that this second source has a brightness consistent with the
earlier PAIRITEL measurement (Morgan; GCN 14333).

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