GCN Circular 5392
Subject
GRB 060801: no variability of optical sources
Date
2006-08-03T15:13:42Z (18 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
S. Piranomonte (INAF-OARm), S. Covino (INAF-OABr), D. Malesani
(SISSA/ISAS), G. Tagliaferri (INAF/OABr), G. Chincarini (Univ.
Milano-Bicocca), and L. Stella (INAF-OARm) report on behalf of the
MISTICI collaboration:
We observed again the field of GRB 060801 (Racusin et al., GCN 5378,
5382; Sato et al., GCN5381) with the ESO VLT equipped with the FORS2
instrument. Standard star fields were observed in order to get a
reliable flux calibration. We find a significant mismatch (more than 1
mag) with respect to the USNO calibration. Adopting the naming
introduced by Castro-Tirado et al. (GCN 5384) and Piranomonte et al.
(GCN 5386), we find the following magnitudes for the four sources close
to the XRT position:
A: R = 21.95
B: R = 23.71 (extended)
C: R = 23.90
D: R = 24.62 (extended)
Between the night of Aug 1 (mean time Aug 2.026 UT) and Aug 2 (mean time
Aug 2.991 UT) we find no variability of any of the above sources up to
~0.1 mag.
We acknowledge the excellent support from the ESO staff, in particular
Oliver Hainaut.
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