GCN Circular 6923
Subject
GRB 071010B: TLS 3rd Epoch - finally a break??
Event
Date
2007-10-16T14:53:51Z (18 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann, U. Laux & R. Filgas (TLS Tautenburg) report:
We observed the afterglow (Oksanen, GCN 6873) of GRB 071010B (Markwardt et
al., GCN 6871) with the Tautenburg 1.34m Schmidt telescope under mediocre
conditions (low transparency), obtaining 12 600 second images in the Rc
band at 5.3 days after the GRB. The afterglow is faintly detected in all
frames. We create a stacked image and, using the same comparison stars as
Kann, Hoegner & Filgas (GCN 6918), we derive the following magnitude:
Date Mid-Time Rc dRc
16.09041 5.22528 21.293 0.045
In comparison with earlier data (see Kann, Hoegner & Filgas, GCN 6918, for
references, and adding Kocevski et al., GCN 6919; Im, Lee & Urata, GCN
6920), we find the afterglow to be 0.3 magnitudes fainter than the
extrapolation of the earlier decay. This may indicate that a break has
occured.
Inclement weather and an instrument switch will probably not allow us to
obtain another epoch. Further follow-up at other northern facilities is
strongly encouraged to check the validity of the break.
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