TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2391
SUBJECT: GRB 030913, optical candidate
DATE:    03/09/20 02:12:37 GMT
FROM:    Alberto Castro-Tirado at LAEFF-INTA  <ajct@laeff.esa.es>

GRB 030913, possible optical counterpart
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S. Guziy, A. de Ugarte Postigo, 
A.J. Castro-Tirado, J.Gorosabel (IAA-CSIC/STScI), 
P. Amado, Antonio Herrería (IAA-CSIC),
Pilar Ruiz-Lapuente (Univ. Barcelona), 
Javier Méndez (ING, La Palma),
J. M. Castro Cerón (STScI),
and A. Zurita (ING, La Palma)

report:

"On Sep 18.04 UT (4.25 days after the burst) we imaged 80% 
of the HETE-II error box for GRB 030913 (Suzuki et al., 
GCNC 2383) with WHT at La Palma trough Johnson V filter. 
We detected an uncatalogued point like source of 
20.9 +/- 0.1 at the following coordinates +/- 2":
  RA(J2000) = 20:58:46.5
  DEC(J2000)= -02:20:59
On Sept 19.87 UT we imaged again the same field from the 1.5m
telescope at Sierra Nevada Observatory (OSN, Granada) and
detected an object at V mag = 23.6 +/- 0.5 on an equivalent
position.
Images of the field are posted on:
http://www.iaa.es/~deugarte/GRBs/GRB030913/
Further images in R and B bands have been obtained that 
confirm the detection. Other observations are encouraged 
to confirm the relation of this object with GRB030913"

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