TITLE: GCN CIRCULAR
NUMBER: 11234
SUBJECT: GRB 100901A: ISON-NM optical observations
DATE: 10/09/06 17:30:05 GMT
FROM: Leonid Elenin at ISON
L. Elenin, I. Molotov (ISON) and A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We continue observation of the Swift GRB 100901A (Immler et al. GCN Circ.
11159) with 0.45-m telescope of ISON-NM observatory on Sep. 04 (UT) 09:04:35 -
10:06:19, Sep. 05 (UT) 08:45:52 - 09:50:20 and Sep. 06 (UT) 09:36:57 - 11:14:22.
The afterglow (Immler et al., GCN 11159; Guidorzi et al., GCN 11160; Ivanov
et al., GCN 11161; Klunko et al., GCN 11162) is well detected on stacked images
for three epochs.
Preliminary photometry of unfiltered image against USNO-B1.0 1127-0027229,
assuming R=16.16 is following:
T-T0 filter exposure mag. mag. error
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2.8336 W 12x300 19.78 +/- 0.25
3.8206 W 12x300 20.38 +/- 0.20
4.8700 W 20x300 20.97 +/- 0.22
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The images of GRB100901A is available at:
http://www.spaceobs.org/images/GRB1000901A-3epochs.jpg