[vsnet-grb-info 4675] GRB 070518: TNG observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6426
SUBJECT: GRB 070518: TNG observations
DATE:    07/05/20 21:23:06 GMT
FROM:    Stefano Covino at Brera Astronomical Observatory  <stefano.covino at gmail.com>

S. Covino, G. Tagliaferri, G. Chincarini (INAF/OABr), L.A. Antonelli,  
G.L. Israel (INAF/Rome), G. Andreuzzi, A. Garcia de Gurtubai Escudero  
(INAF/TNG) on behalf of the CIBO collaboration, report:

We observed the field of GRB070518 (GCN 6415, Guidorzi et al.) with  
the Italian Telescopio Nazionale Galileo (TNG) equipped with Dolores  
in the R band at about 10 and 35 hours from the burst. We clearly  
detected the optical afterglow (GCN 6415, Guidorzi et al.; GCN 6418,  
Jelinek et al.; GCN 6419, Cucchiara et al.).

At about 35 hours from the burst the afterglow magnitude was R ~  
23.3. The decay index between the two epochs was about 0.5,  
significantly shallower than what reported at earlier times by  
Cucchiara et al. (GCN 6419). At about 2.5 arcsec NE of the afterglow  
we also detect a fainter source with no evidence of extended emission.


Further observations are in progress.

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