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GCN Circular 16504

GRB 140703A: BOOTES-2 and OSN optical observations
2014-07-03T03:30:45Z (10 years ago)
Alberto Castro-Tirado at Astro. de Andalucia <>
R. Cunniffe, A. Gonzalez-Rodriguez, V. Casanova, M. Jelinek, S. Jeong, O.
Lara-Gil, S. R. Oates, R. Sanchez-Ramirez, J. C. Tello (IAA-CSIC Granada),
P. Kubanek (IP-ASCR, Prague), J. Gorosabel (IAA-CSIC, UPV-EHU) and A. J.
Castro-Tirado (IAA-CSIC, ISA-UMA), report:

Following the detection of GRB 140703A by Swift (Kocevski et al., GCNC
16503), the 0.6m TELMA robotic telescope at the BOOTES-2 astronomical
station Malaga (Spain), responded to the GRB location starting at 00:38:02
UT (i.e. 45s postburst, in the clear filter, 5s integrations). In the
longer exposures (i'-band, 60s) starting at 00:47:30 (i.e. 10 min
postburst), a faint optical source is barely detected in the images, at
the outskirts of the XRT position, which is confirmed by the 1.5m OSN
images at Sierra Nevada Observatory starting at 00:54 UT (I-band), with a
magnitude of about 20, which does not seem to be present in the DSS-2. The
preliminary position (+/- 1") is:

RA(J2000) = 00 51 59.05, Dec (J2000) = +45 06 06.

The source is detected in all optical filters. Additional observations
(imaging and spectroscopy) are ongoing.

[GCN OPS NOTE(03jul14): Per author's request, the starting time was changed
from 00:30:02 to 00:38:02 (ie 8 min later), and the characterset represenation
for the i'-band specification was changed to plain-text.]
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