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GCN Circular 11170

GRB 100901A - NOT optical observation
2010-09-02T03:09:25Z (14 years ago)
Annalisa De Cia at U of Reykjavik,Science Inst. <>
A. De Cia, P.M. Vreeswijk and P. Jakobsson (University of
Iceland) report:

We observed the field of GRB 100901A (Immler et al., GCN 11159)
with the NOT equipped with ALFOSC in good weather conditions.
Observations were carried out in the R filter for 15 minutes,
with mean time 12.13 hours after the GRB trigger.

We measure R=17.3 for the afterglow, not corrected for Galactic
extinction, calibrated against the USNO-B1.0 1127-0027231
reference star (R=15.37) used by Andreev et al., GCN 11166 and
GCN 11168.

 time after trigger       exposure (s)         R mag

     12.13 hours            3 x 300             17.3

We acknowledge the careful assistence of the NOT staff, in
particular Tapio Pursimo.
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