GCN Circular 3538
Subject
GRB050607: refined analysis of prompt REM observations
Date
2005-06-08T12:42:48Z (19 years ago)
From
Vincenzo Testa at INAF/Astro. Obs. of Rome <testa@mporzio.astro.it>
V. Testa, E. Palazzi, P. D'Avanzo, L.A. Antonelli, E. Molinari, D. Fugazza,
S. Covino, S. Campana, F.M. Zerbi, G. Chincarini, M. Rodono', G. Tosti,
P. Conconi, G. Cutispoto, L. Nicastro, F. Vitali, E. Meurs, P. Goldoni,
on behalf of the REM/ROSS Team
We refined the analysis of the field of GRB050607 observed with the REM
telescope (GCN 3523) in fully automated mode simultaneously in the near
infrared and in the optical. Two R-band 3s exposures and five H-band 10s
exposures have been re-analyzed to search for new objects at the positions
reported by Rhoads (GCN 3527) and Pagani et al. (GCN 3528). We confirm
the non-detection reported in GCN 3523 and derived upper limits at 3 sigma
level (see the table below). The UT differences between optical and IR
acquisitions are due to different overheads and observing strategies adopted
by the two instruments.
Filter Instrument UT t_exp Time_from_burst Mag. Upper Limit
--------------------------------------------------------------------------
R ROSS 09:14:49 6s 207s 17.1
H REMIR 09:14:34 50s 192s 16.0
Observations were performed under moderate seeing conditions, the La Silla
DIMM giving an instantaneous value of 1.5 arcsec, and in photometric
conditions. Magnitudes have been calibrated with a set of stars around the
position of the optical detection (GCN 3527) extracted from the 2MASS catalog
for the H filter and from the USNO B1.0 catalog for the R filter.
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