GCN Circular 926
Subject
GRB010126, TNG R-band observations
Date
2001-01-29T16:53:29Z (24 years ago)
From
Nicola Masetti at ITeSRE,CNR,Bologna <masetti@tesre.bo.cnr.it>
N. Masetti, E. Palazzi (ITeSRE, CNR, Bologna), M. Pedani, A. Magazzu,
F. Ghinassi (TNG) and E. Pian (OATs, Trieste), on behalf of a larger
collaboration, report:
"We acquired optical R-band images of the central part of the
GRB010126 Ulysses/Konus/RXTE error box (Hurley et al., GCN #922)
on 2001 Jan. 27.26 and 28.27 UT (i.e. 21 and 45 hours after the GRB)
with TNG+Dolores. The total exposure time was 10 minutes for each epoch.
Seeing was 1.3 and 1.7 arcsec on the two epochs, respectively.
The images covered about 60% of the GRB error box.
Photometric calibration was performed using the USNO-A2.0 catalog star
U1350_08031829, with magnitude R = 17.9 and coordinates (J2000)
RA = 11 57 10.29; Dec = +49 46 58.9.
The comparison between the two epochs does not reveal any object
with significant brightness variation down to a 3-sigma limiting
magnitude R ~ 23.5 .
The object reported by Bartolini et al. (GCN #924) is well detected on
both epochs and is constant within the measurement errors at magnitude
R = 21.29 +- 0.05 (excluding zero-point calibration uncertainties).
This is consistent with the findings by Pedersen et al. (GCN #925).".
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