GRB 180624A: NOT optical counterpart
Abstract
We observed the optical afterglow (Guidorzi, GCN #22839; Schady, GCN #22840; Rossi et al., GCN #22845; Watson et al., GCN #22846; Guidorzi et al., GCN #22858) of GRB 180624A (Gibson et al., GCN #22832) with the 2.5-m Nordic Optical Telescope (NOT) equipped with StanCam. Observations were carried out in the Bessel R filter, but calibrated against Pan-STARRS r-band local photometry, using the transformations of Lupton (2005). An optical afterglow is detected at a position consistent with previous reports. At a mid time 11.0 hr after the BAT trigger, we measure for the counterpart R = 20.10 +- 0.04 (Vega). This measurement has not been corrected for Milky Way extinction (A_V = 0.13). Due to the vicinity of the nearby galaxy noted by Schady (GCN #22840), Guidorzi et al. (GCN #22858), and Rossi et al. (GCN 22845), we cannot exclude some minor contamination from this object to the afterglow photometry.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- June 2018
- Bibcode:
- 2018GCN.22867....1S