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GCN Circular 7984

Subject
GRB 080714: GROND confirmation of the optical/NIR afterglow
Date
2008-07-16T06:43:03Z (16 years ago)
From
Thomas Kruehler at MPE/MPI <kruehler@mpe.mpg.de>
T. Kruehler, J. Greiner, C. Clemens, A. Yoldas (all MPE Garching), A.
Kupcu Yoldas (ESO) and G. Szokoly (Eoetvoes Univ., Budapest) report on
behalf of the GROND team: 

We observed the field of GRB 080714 (Swift trigger 316910; M. Perri et
al., GCN #7978) in two epochs, simultaneously in g'r'i'z'JHK with GROND
(Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope
at La Silla Observatory (Chile). 

We detect the optical afterglow reported by Marshall & Perri (GCN #7982) at 

RA (J2000.0) = 13h 32m 25.49s
DEC (J2000.0) = -60d 16' 39.3" 

with an absolute uncertainty of 0.6". 

Preliminary photometry yields the following magnitudes against USNO-B1 and
2MASS field stars in stacked images: 


Band  T_mid(h)     Exp(min)   Mag 

g'    6.4058       50         > 24.3
g'    30.3847      32         > 23.4
r'    6.4058       50         22.76 +- 0.08
r'    30.3847      32         > 23.6
i'    6.4058       50         21.15 +- 0.07
i'    30.3847      32         22.68 +- 0.24
z'    6.4058       50         20.39 +- 0.06
z'    30.3847      32         21.82 +- 0.29
J     6.2827       40         18.58 +- 0.11
J     30.2958      30         20.00 +- 0.16
H     6.2827       40         17.25 +- 0.14
H     30.2958      30         18.52 +- 0.24 

not corrected for the expected Galactic foreground reddening of around
E(B-V) =  1.15 mag (Schlegel et al., 1998).
Given the high foreground extinction, the non detection in g' is
consistent with the powerlaw slope of the broad band SED derived from r to
H and does not necessarily imply a high redshift. 

Additionally, we note the presence of a nearby, faint (r'~ 24.1 +- 0.2)
source at 

RA (J2000.0) = 13h 32m 25.60s
DEC (J2000.0) = -60d 16' 37.7" 

roughly 1.8" away from the afterglow, which may influence the photometry
in the second epoch.
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