[AAVSO-HEN] GRB 090313: Ongoing plateau phase

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  8992
SUBJECT: GRB 090313: Ongoing plateau phase
DATE:    09/03/13 23:39:20 GMT
FROM:    Antonio Deugarte at IAA-CSIC  <deugarte at iaa.es>

A. de Ugarte Postigo (ESO), J. Gorosabel, A. Sota, A.J. Castro-Tirado
(IAA-CSIC) report on behalf of a larger collaboration:

We have observed the field of GRB 090313 (Mao et al. GCNC 8980)
with the 1.5m OSN telescope (Granada, Spain) starting on  22:29 UT
(13.4 hours after the burst). Our I-band images show that the optical
afterglow reported by Chornock et al. (GCNC 8979) is still bright.
Preliminary photometry yields I=17.7+/- 0.3. This would imply that the
plateau phase reported by Perley et al. (GCN 8985) is still ongoing,
half a day later.

Further observations are encouraged