GCN Circular 3686
Subject
GRB050709: Second Epoch Chandra Observation
Event
Date
2005-07-27T01:26:13Z (21 years ago)
From
Angelo Antonelli at Obs. Astro. di Roma <a.antonelli@mporzio.astro.it>
L.A. Antonelli, M.L. Conciatore (INAF/OAR), D. Malesani (SISSA), S.
Covino, P. D'Avanzo, S. Campana, G. Tagliaferri (INAF/OABr), M. Della
Valle (INAF/OAA), F. Fiore, G.L. Israel, L. Stella (INAF/OAR), G.
Chincarini (Univ. Milano-Bicocca), report on behalf of the MISTICI
collaboration:
The Chandra X-ray observatory observed a second time the field of the
GRB 050709 (Butler et al., GCN 3570; Boer et al., GCN 3653). The
observation, performed with ACIS, started on 2005 Jul 25.86234 UT and
ended on 2005 Jul 26.09042, for a total exposure time of 18284 s. The
X-ray source reported by Fox et al. (GCN 3585) and coincident with the
proposed optical counterpart (Jensen et al., GCN 3589; Price et al.,
GCN 3612) is still marginally detected in the second epoch.
We obtained for this source a count rate of (8.4+/-3.5)E-4 cts/s in the
(0.3-8.0 keV) band.
This count rate compared to the one obtained in the previous
observation in the same band (1.2+/-0.2)E-3 cts/s (Fox et al., GCN
3585) does not allow us to firmly establish any variability for the
proposed X-ray afterglow.
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