TITLE:   GCN CIRCULAR
NUMBER:  3297
SUBJECT: GRB 050421: Optical observations at the INT
DATE:    05/04/21 07:43:55 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct@iaa.es>

A. de Ugarte Postigo (IAA-CSIC), J. Furnes, R. Corradi (ING, La Palma),
M. Jelinek, J. Gorosabel and A. J. Castro-Tirado (IAA-CSIC Granada),

report:

"Following the detection by SWIFT/BAT of GRB 050421 (Barbier et al. GCN
Circ. 3296), we started observations at the 2.5m Isaac Newton Telescope at
Observatorio del Roque de los Muchachos in La Palma. The first 120-s image
(in the Sloan i-band filter), started on Apr 21.1858 UT (i.e. 15.7 min 
after the
event).  We do not see any object within the reported SWIFT/XRT position.
Further analysis of additional i-band images is in progress."

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