GCN Circular 16611

J. Bolmer, F. Knust, K. Valera and J. Greiner (all MPE Garching)
report on behalf of the GROND team:

We observed the field of GRB 140719A (Swift trigger 605612; Cummings et al.,
GCN 16606
Not found
 
 
) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.  2008,
PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla
Observatory (Chile).

Observations started at 22:59 UT on July 19, 2014, 16.8 hrs after
the GRB trigger. They were performed at an average seeing of 1.1��� and 
at an average airmass of 1.5.

We find a faint source inside the XRT error circle given in Evans et al.
(GCN 16607
Not found
 
 
) at coordinates RA, Dec = 171.60123, -50.13466, which is 
equal to:

RA  (J2000):  11:26:24.3
Dec (J2000): -50:08:04.8

with an uncertainty of 0.5 arcsec in each coordinate.

Based on a total exposures of 3000 seconds in g'r'i'z' and 1200 seconds 
in JHK, at a mid-time of 18.4 hrs after the burst, we measure the 
following preliminary magnitudes (all in AB):

g' > 25.3,
r' = 23.7 +/- 0.2,
i' = 22.9 +/- 0.2,
z' > 23.8,
J  > 21.4,
H  > 20.9 and
K  > 19.5.

At present we cannot confirm whether the source is fading.

Given magnitudes are calibrated against GROND zeropoints as well as
2MASS field stars and are not corrected for the expected Galactic
foreground extinction corresponding to a reddening of E_(B-V) = 0.12 mag
in the direction of the burst (Schlegel et al. 1998).

[GCN OPS NOTE(20jul14): Per author's request, the author list was added
and the arcsec symbol was replaced.]