GCN Circular 4810
Subject
GRB 060218: rebrightening
Event
Date
2006-02-22T03:48:28Z (20 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
P. D'Avanzo (INAF/OABr), D. Malesani (SISSA/ISAS), M. Della Valle
(INAF/OAA), D. Fugazza (INAF/OABr), N. Masetti, E. Palazzi (INAF/IASF
Bo), E. Pian (INAF/OATs), L.A. Antonelli, V. D'Elia, F. Fiore, S.
Piranomonte, L. Stella (INAF/OAR), S. Campana, G. Chincarini, S. Covino,
G. Tagliaferri (INAF/OABr), L. Di Fabrizio (INAF/TNG), report:
We observed again the optical counterpart of GRB 060218 (Moretti et al.
GCN 4775; Marshall et al., GCN 4779) with the TNG telescope. Comparison
between our previous photometry (taken on Feb 20.85 UT) and the new
observations (Feb 21.84 UT) reveals a rebrightening by 0.20+-0.05 mag in
both the V and R filters.
Following the earlier decay (e.g. Marshall et al., GCN 4800; Berger et
al., GCN 4808), this behaviour may mark the emergence of the underlying
SN 2006aj already suggested on spectroscopic grounds (Masetti et al.,
GCN 4803; Soderberg et al., IAUC 8674; Fugazza et al., GCN 4807, CBET
410; Mirabal et al., CBET 409; Fatkhullin et al., GCN 4809). The
rebrightening may also suggest that the SN is still before its maximum.
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