[vsnet-grb-info 2726] GRB 060121: I-band Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Jan 23 02:26:08 JST 2006
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 4563
SUBJECT: GRB 060121: I-band Limits
DATE: 06/01/22 17:23:55 GMT
FROM: Melissa Nysewander at UNC,Chapel Hill <mnysewan at physics.unc.edu>
M. Nysewander, J. Kirschbrown, D. Reichart, P. Holvorcem, M. Schwartz
report on behalf of the UNC GRB Team:
We began imaging the error circle of GRB 060121 (Arimoto et al., GCN 4550)
at 03:58:17 UT, 5.6 hours after the burst, with the Tenagra II 32-inch
Telescope in the I filter. The images are calibrated to 5 transformed
I-band magnitudes derived from the photometry of the SDSS (Cool et al., GCN
4554).
In a stack of 12 x 300s exposures, we do not see the optical afterglow
(Malesani et al., GCN 4561; Levan et al., GCN 4562) down to a 3-sigma
limiting magnitude of I = 20.9 at a mean time of 6.1 hours after the burst.
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