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GCN Circular 18898

GRB 160117B: further NOT optical observations of the afterglow
2016-01-19T15:16:17Z (8 years ago)
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <>
D. Malesani (DARK/NBI), D. Xu (NAOC/CAS), C.E. Martinez-Vazquez 
(IAC-ULL), and P. Jakobsson (Univ. Iceland) report on behalf of a larger 

We observed again the optical counterpart of GRB 160117B (Sonbas et al., 
GCN 18875), using the NOT equipped with the AlFOSC camera. Our 
observation was carried out in the R band and was composed of 4x300 s 
exposures, with mean time January 19.10 UT (1.52 days after the GRB).

Compared to our previous observation (Malesani et al., GCN 18884), we 
find a decay slope alpha = 1.10 +- 0.05 (assuming a single power-law 
decay F propto t^-alpha). This decay is steeper than what reported at 
early time by Kruehler et al. (GCN 18878).
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