[vsnet-grb-info 7534] GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9092
SUBJECT: GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
DATE:    09/04/05 00:34:01 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct at iaa.es>

P. Yock (Auckland Univ.), B. Allen (Vintage Lane Obs., Blenheim), , A. de
Ugarte Postigo (ESO Santiago), P. Kubánek (GACE, Univ. of Valencia), A.
Sota and A. J. Castro-Tirado (IAA-CSIC Granada), on behalf of a larger
collaboration, report:

"Following the detection by Swift of GRB 090404 (Ziaeepour et al. GCNC
9086), the 0.6-m Yock-Allen robotic telescope at the BOOTES-3 astronomical
station in Blenheim (New Zealand) responded automatically, under
non-favourable conditions (very high airmass). The first i'-band images
taken 185s after the trigger time (15:59:35 UT) set a limiting magnitude
of i' = 15 at this time. Follow-up observations at the 1.5-m telescope at
Observatorio de Sierra Nevada in Granada have been obtained starting at
21:46 UT. No optical afterglow in the I-band is detected at the Swift/XRT
enhanced position (Beardmore et al. GCNC 9088) down to the DSS2-infrared
limit.  A more detailed analysis is in progress."

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