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GCN Circular 29864

Subject
GRB 210420B: RATIR Optical and NIR Observations
Date
2021-04-21T15:03:09Z (3 years ago)
From
Nat Butler at Az State U <natbutler@asu.edu>
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 210420B (Moss, et al., GCN 29844Not found
 
 
) 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 2021/04 21.39 to 2021/04 21.49 UTC (13.73 to 16.08 hours
after the BAT trigger), obtaining a total of 1.47 hours exposure in the r
and i bands and 0.55 hours exposure in the Z, Y, J, and H bands.

We detect the source reported by Oksanen (GCN 29846Not found
 
 
), Lipunov et al. (GCN
29845Not found
 
 
), Leonini et al. (GCN 29851Not found
 
 
), de Ugarte Postigo et al. (GCN 29852Not found
 
 
),
Watson et al. (GCN 29858Not found
 
 
), Zheng et al. (GCN 29861Not found
 
 
), and Breeveld et al.
(GCN 29862Not found
 
 
).  In comparison with the SDSS DR9 and 2MASS catalogs, we obtain:

  r = 19.98 +/- 0.02
  i = 19.77 +/- 0.02
  Z = 19.70 +/- 0.03
  Y = 19.48 +/- 0.05
  J = 19.31 +/- 0.05
  H = 19.26 +/- 0.08

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.