[vsnet-grb-info 28087] GRB 210610B: RATIR Optical and NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30190
SUBJECT: GRB 210610B: RATIR Optical and NIR Observations
DATE:    21/06/11 05:42:17 GMT
FROM:    Rosa Leticia Becerra Godinez at Inst. de Astronoma,UNAM  <rbecerra at astro.unam.mx>

Rosa L. Becerra (UNAM), Alan M. Watson (UNAM), Nat Butler (ASU), 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), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM),
Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and
Vicki Toy (UMD) report:

We observed the field of GRB 210610B (K.L. Page, et al., GCN 30170 and J.P.
Osborne, et al., GCN 30189)
with the
Reionization and Transients Infrared Camera (RATIR) on the 1.5m Harold
Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San
Pedro Mártir from 2021/06 11.16 to 2021/06 11.18 UTC (7.91 to 8.38
hours after the BAT trigger), obtaining a total of 0.33 hours exposure
in the r and i bands and 0.15 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 catalogs, we obtain the following detections and upper
limits (3-sigma):

  r = 18.03 +/- 0.01
  i = 17.86 +/- 0.01
  Z = 17.65 +/- 0.01
  Y = 17.47 +/- 0.02
  J = 17.55 +/- 0.03
  H = 17.43 +/- 0.03

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

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