[vsnet-grb-info 14149] GRB 131030A: RATIR Optical and NIR Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15463
SUBJECT: GRB 131030A: RATIR Optical and NIR Upper Limits
DATE:    13/11/07 21:36:11 GMT
FROM:    Owen Littlejohns at Az State U  <olittlej at asu.edu>

---------- Forwarded message ----------
From: Owen Littlejohns <olittlej at asu.edu>
Date: 7 November 2013 13:23
Subject: GRB 131030A: RATIR Optical and NIR Upper Limits
To: Owen Littlejohns <olittlej at asu.edu>


Owen Littlejohns (ASU), 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 (ORAU/GSFC),
Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), José A. de
Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM),
Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey
Moseley (GSFC) report:

We again observed the field of GRB 131030A (Troja, et al., GCN
Circ. 15402) with the Reionization and Transients Infrared Camera
(RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the
Observatorio Astronómico Nacional on Sierra San Pedro Mártir from
2013/11 7.09 to 2013/11 7.33 UTC (173.34 to 178.87 hours after the
BAT trigger), obtaining a total of 3.40 hours exposure in the r
and i bands and 1.41 hours exposure in the Z, Y, J, and H bands.

For a source within the Swift-XRT error circle, in comparison
with the SDSS DR9 and 2MASS, we obtain the following upper limits
(3-sigma):

  r     > 23.52
  i     > 23.11
  Z     > 22.69
  Y     > 22.17
  J     > 21.87
  H     > 21.35

These magnitudes are in the AB system and are not corrected for
Galactic extinction in the direction of the GRB. The upper limits
obtained in the r and i bands are consistent with the reported
decay from previous epochs of RATIR observations (Littlejohns, et
al., GCN Circ. 15462).

We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.