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GCN Circular 4785

Subject
Brightening of the Optical Counterpart of the Possible GRB 060218
Date
2006-02-19T06:07:32Z (18 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F. Marshall (GSFC), S. Immler (GSFC/USRA) and G. Cusumano (IASF-Pa INAF)
report on behalf of the Swift team:

Continuing UVOT observations of the possible GRB 060218 show that
the candidate optical afterglow reported by Cusumano et al. (GCN 4775)
and Marshall et al. (GCN 4779) has brightened by a factor of about 5
in the 10 hours since the BAT trigger. Consequently, this source is unlikely
to be the optical afterglow of a GRB. This brightening, the extended emission
detected with BAT, and the possible BAT detection a month earlier
(Barbier et al. GCN 4780) suggest that the UVOT source is the optical
counterpart of a hard X-ray transient.
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