[vsnet-grb-info 15768] GRB 141109A: NOT r-band observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17056
SUBJECT: GRB 141109A: NOT r-band observation
DATE:    14/11/10 21:27:58 GMT
FROM:    Zach Cano at U of Iceland  <zewcano at gmail.com>

​Z. Cano (U. Iceland), D. Malesani (DARK/NBI), K. Nilsson (FINCA), T.
Kangas (U. Turku), P. Jakobsson (U. Iceland) report on behalf of a larger
collaboration:

We observed the field of GRB 141109A (D'Avanzo et al., GCN Circ. 17037)
with the 2.5-m Nordic Optical Telescope (NOT) with ALFOSC starting at 04:39
UT on 10-Nov-2014.  We obtained 3x300 s frames in the SDSS r-band filter.

We clearly detect the optical afterglow of GRB 141109A (Covino, GCN Circ.
17039; Xu et al., GCN Circ. 17040; Graham et al., GCN Circ. 17041; Im et
al., GCN Circ. 17042; Xin et al., GCN Circ. 17053), which has an apparent
magnitude of r=22.1 +- 0.1 at a mid exposure time of +22.8 hr.  The
magnitude is not corrected for foreground extinction, and is calibrated
using several nearby SDSS stars in the FOV.​