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GCN Circular 1151

GRB011121: fading behavior
2001-11-22T08:04:55Z (23 years ago)
Krzysztof Z. Stanek at CfA <>
K. Z. Stanek (Harvard-Smithsonian CfA), P. M. Garnavich (Notre Dame)
and Lukasz Wyrzykowski (Warsaw University Observatory) report:

Further R-band observations of the possible optical afterglow of the
GRB011121 carried out with the OGLE 1.3m telescope (+8kx8k OGLE-III
mosaic) 12.5 hours after the burst, indicate a fading behavior of the
new source at 11:34:30.38, -76:01:41.3 (J2000) reported by Wyrzykowski
et al. (GCN 1150):

HJD-2450000         UT           R_c       exp
2235.71890    011122 05:19  18.31+-0.03  200 sec
2235.80322    011122 07:20  18.64+-0.03  200 sec

Errors in the magnitudes are statistical only.  The R-band magnitudes
are relative to star "A" (11:34:18.9, -76:01:38.1, J2000), assuming
its magnitude R=17.4 (see GCN 1150).

Inspection of the Digitized Sky Survey shows a faint object 0.5" to
the northeast of the OT. The source, possibly the host galaxy has a
magnitude of approximately R=20.4 based on the assumed brightness of
star A.

We have also obtained BVI observations of the afterglow, reductions
of which are under way.

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