GCN Circular 2503
Subject
GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
Date
2003-12-29T19:55:03Z (20 years ago)
From
Angelo Antonelli at Obs. Astro. di Roma <angelo@coma.mporzio.astro.it>
L.A. Antonelli, V. Testa (INAF-OAR, Rome), D. Fugazza (INAF-OABr, Merate),
M. Pedani (INAF-TNG, La Palma), L. Piro (INAF-IASF, Rome), S. Covino
(INAF-OABr, Merate), N. Masetti, (INAF-IASF, Bologna), D. Malesani
(Sissa, Trieste) on behalf of the larger Italian GRB Collaboration
report:
"On 28 Dec. we imaged the field of the X-ray rich GRB031220
(HETE trigger 2976) with the Telescopio Nazionale Galileo and
DOLORES instrument operated in imaging mode. The observation
started at 00:54 UT and the field was imaged for a total exposure
time of 1 hour in the R-band. Seeing varied during the observation
from 1.1'' to 1.4''.
At the position consistent with four of the X-ray sources observed
by Chandra and reported by De Pasquale et al. (GCN 2502) we found
the following optical counterparts:
Chandra
ID# RA DEC Rmag Err(mag)
6 4 39 46.49 7 22 19.30 20.61 0.05
27 4 40 03.71 7 20 55.98 19.42 0.05
17 4 39 54.82 7 21 49.05 23.10 0.07
7 4 39 46.13 7 22 56.26 23.48 0.11
(for errors on positions we assume a conservative value of 0.6")
For the other two sources detected by Chandra (#2 and #1 see GCN 2502)
we did not find evidence of optical counterparts. We derived a 3 sigma
limiting magnitude of R>24 for both sources.
Source #37 (CXOU J043857.1+072449) is out of the field of view.
A further NIR observation of this field is planned at TNG.
We thank the personnel of TNG for their enthusiastic effort
to the GRB program.
This message may be cited"
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