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GCN Circular 26121

GRB 191031D: RATIR Optical and NIR Observations
2019-11-01T04:40:51Z (5 years ago)
Alan M Watson at UNAM <>
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H.
Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska
(UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen
Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes��s Gonz��lez (UNAM), Carlos
Rom��n-Z����iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou
(U. Wash.), and Vicki Toy (UMD) report:

We observed the field of GRB 191031D (Fermi GBM Team, GCN Circ. 26111; D'Elia et
al., GCN Circ. 26112) 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 2019/11 1.09 to 2019/11
1.12 UTC (4.65 to 5.49 hours after the BAT trigger), obtaining a total of 0.56
hours exposure in the r and i bands, 0.23 hours exposure in the Z and Y
bands, and 0.06 hours exposures in the J and H bands.

For a source within the Swift-XRT error circle, in comparison with the USNO-B1
and 2MASS catalogs, we obtain the following upper limits (3-sigma):

  r	> 22.94
  i	> 23.17
  Z	> 21.50
  Y	> 21.40
  J	> 19.44
  H	> 19.33

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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