Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 15346

GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
2013-10-16T22:34:10Z (11 years ago)
Eleonora Troja at GSFC <>
Eleonora Troja (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), Antonino Cucchiara (ORAU/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 reobserved the field of GRB 131014A (Fitzpatrick, et al., GCN 15332;
Desiante, et al., GCN 15333) with the Reionization and Transients Infrared
Camera (RATIR; on the 1.5m Harold Johnson Telescope at
the Observatorio Astron�mico Nacional on Sierra San Pedro M�rtir from
2013/10 16.36 to 2013/10 16.52 UTC (51.38 to 55.33 hours after the
GBM trigger), obtaining a total of 2.11 hours exposure in the r and i bands
and 0.88 hours exposure in the Z, Y, J, and H bands.

We do not detect the source reported in Troja et al. (GCN 15340).
In comparison with SDSS DR9 and 2MASS, we obtain the following upper
limits (3-sigma):

   r   >23.8
   i   >23.4
   Z   >22.4
   Y   >21.7
   J   >21.4
   H   >20.9

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.

We note that the source reported in Troja et al. (GCN 15340) lies within 
XRT localization reported in Kennea et al. (GCN 15335), but is ~4 arcsec
offset from the XRT enhanced position (Evans et al., 15339).
However, the source shows evidence of fading in our latest exposures
(>3 sigma level, i band; 2-sigma level, r and Y band), suggesting that
it is associated with GRB131014A.

We thank the staff of the Observatorio Astron�mico Nacional in San Pedro
Looking for U.S. government information and services? Visit