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GCN Circular 15849

Subject

GRB 140215A: Continued RATIR Optical and NIR Observations

Date

2014-02-16T17:45:42Z (10 years ago)

From

Owen Littlejohns at Az State U <olittlej@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), 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 again observed the field of GRB 140215A (Markwardt, et al.,
GCN 15837Not found
 
 
) with the Reionization and Transients Infrared Camera
(RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the
Observatorio Astron�mico Nacional on Sierra San Pedro M�rtir from
2014/02 16.20 to 2014/02 16.36 UTC (24.65 to 28.57 hours after the
BAT trigger), obtaining a total of 2.18 hours exposure in the r and
i bands and 0.88 hours exposure in the Z, Y, J, and H bands.

We continue to detect the previously reported source in all bands, at
fainter magnitudes than the previous epoch of RATIR observations (Butler
et al., GCN 15841Not found
 
 
). In comparison with 2MASS, we obtain the following
detections:

  r     21.51 +/- 0.11
  i     21.19 +/- 0.10
  Z     21.37 +/- 0.24
  Y     20.68 +/- 0.21
  J     20.69 +/- 0.16
  H     20.43 +/- 0.18

These magnitudes are in the AB system and are not corrected for
Galactic extinction in the direction of the GRB. In comparison to the
previous epoch of RATIR observations the source has faded with
approximate power-law index of t^-1 in all bands.

We thank the staff of the Observatorio Astron�mico Nacional in San Pedro
M�rtir.