[vsnet-grb-info 20603] GRB 180510B: GROND detection in all bands
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri May 11 20:12:36 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 22701
SUBJECT: GRB 180510B: GROND detection in all bands
DATE: 18/05/11 11:12:06 GMT
FROM: Patricia Schady at MPE/Swift <pschady at mpe.mpg.de>
P. Schady (MPE, Garching) reports:
We observed the field of GRB 180510B (Swift trigger 831816; Tohuvavohu et
al., GCN #22696) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla
Observatory (Chile).
Observations started at 23:14 UT on 10th May, 3.0 hours after the GRB
trigger. They were performed at an average seeing of 1.3" and at an
average airmass of 1.8.
A single point source is present within the 1.5" Swift-XRT error circle
reported by Beardmore et al. (GCN #22698) at
RA (J2000.0) = 05:11:52.66
DEC (J2000.0) = -62:19:26.4
with an uncertainty of 0.2" in each coordinate.
Based on 6.6 min of total exposures in g'r'i'z' and 6 min in JHK, the
estimated AB magnitudes are
g' = 20.5 +/- 0.1 mag
r' = 20.0 +/- 0.1 mag
i' = 19.8 +/- 0.1 mag
z' = 19.6 +/- 0.1 mag
J = 18.8 +/- 0.1 mag
H = 18.5 +/- 0.1 mag
K = 18.0 +/- 0.1 mag
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)=0.02 in the direction
of the burst (Schlafly & Finkbeiner 2011).
I would like to thank Markus Rabus for his excellent support from La Silla.
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