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GCN Circular 15463

Subject
GRB 131030A: RATIR Optical and NIR Upper Limits
Date
2013-11-07T21:36:11Z (11 years ago)
From
Owen Littlejohns at Az State U <olittlej@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), 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 again observed the field of GRB 131030A (Troja, et al., GCN
Circ. 15402Not found
 
 
) 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 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. 15462Not found
 
 
).

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

[GCN OPS NOTE(07nov13): Per operator's desire, I removed some email header detritus.]