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GCN Circular 15438

Subject
GRB131031A: RATIR Optical and NIR Observations
Date
2013-11-02T00:56:18Z (11 years ago)
From
Antonino Cucchiara at UCSC/UCO Lick <acucchia@ucolick.org>
A. Cucchiara (ORAU/GSFC), 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), 
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), 
and Harvey Moseley (GSFC) report:

We observed the field of GRB 131031A (Cummings et al., GCN 15421) 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 2013/11 1.21 to 2013/11 1.48 UTC (17.44
to 23.99 hours after the BAT trigger), obtaining a total of 4.47 hours
exposure in the r and i bands and 1.81 hours exposure in the Z,
Y, J, and H bands.

The source within the XRT error circle (Gompertz et al., GCN 15424) and 
confirmed by Gorosabel et al. (GCN 15426) is clearly detected. 
In comparison with the SDSS DR9 and 2MASS, we
obtain the following detections and upper limits (3-sigma):

 r	22.38 +/- 0.07
 i	22.34 +/- 0.09
 Z	21.89 +/- 0.14
 Y	> 21.81
 J	> 21.36 
 H	> 20.69 

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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