[vsnet-grb-info 14856] GRB 140423A: RATIR Optical and NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16170
SUBJECT: GRB 140423A: RATIR Optical and NIR Observations
DATE:    14/04/24 17:13:50 GMT
FROM:    Owen Littlejohns at Az State U  <olittlej at 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), José A. de
Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM),
Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey
Moseley (GSFC) report:

We observed the field of GRB 140423A (Sonbas, et al., GCN 16142) with
the Reionization and Transients Infrared Camera (RATIR; www.ratir.org)
on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico
Nacional on Sierra San Pedro Mártir from 2014/04 24.29 to 2014/04
24.49 UTC (22.48 to 27.13 hours after the BAT trigger), obtaining a
total of 2.56 hours exposure in the r and i bands and 1.07 hours
exposure in the Z, Y, J, and H bands.

We detect the previously reported optical counterpart candidate
(Elenin, et al., GCN 16143; Chester, et al., GCN 16147; Chester, et
al., GCN 16157). For a source within the UVOT error circle (Chester,
et al., GCN 16147), in comparison with the SDSS DR9 and 2MASS, we
obtain the following detections:

  r     21.90 +/- 0.08
  i     21.79 +/- 0.07
  Z     21.65 +/- 0.19
  Y     21.39 +/- 0.17
  J     20.98 +/- 0.20
  H     21.33 +/- 0.26

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 Astronómico Nacional in San
Pedro Mártir.