GCN Circular 7696
Subject
GRB 080506: TLS 2nd Epoch - possible light curve break
Date
2008-05-08T03:18:02Z (16 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann, C. Hoegner, and S. Ertel (TLS Tautenburg) report:
We observed the afterglow of Swift GRB 080506 (Baumgartner et al., GCN
7685) with the Tautenburg 1.34m Schmidt telescope 1.33 days after the GRB,
again in good conditions. We obtained a four 300 sec exposures in the Rc
band before twilight shut us down. The afterglow is faintly detected in
the stacked image.
Using the same comparison star as Kann et al. (GCN 7688), we find:
time (days) Rc dRc
1.3346 22.23 0.33
An extrapolation of the decay in the first 0.4 days (~0.63, Kann et al.,
GCN 7688, de Ugarte Postigo et al., GCN 7690) yields an expected magnitude
of Rc ~ 21.8 at 1.33 days after the GRB. Our measured value lies below the
extrapolation, indicating a break (possibly a jet break) may have occured.
We caution that the detection is rather marginal and the high sky
background may falsify the measurement.
This message may be cited.