GCN Circular 22718
Subject
GRB 180512A: LBT optical detection
Date
2018-05-13T13:13:01Z (6 years ago)
From
Andrea Rossi at INAF <a.rossi@iasfbo.inaf.it>
A. Rossi and E. Palazzi (INAF-OAS) report on behalf of the CIBO
colaboration:
We observed the field of GRB180512A (Swift trigger 832119; Deich et
al., GCN #22710) simultaneously in r' and z' bands with the LBC imager
mounted on LBT (Mt Graham, AZ, USA). Observations started at 04:05 UT on
2018-05-13, 6 hrs after the GRB trigger and finished at 04:27 UT and
allowed us to obtain 20min of exposure in each band.
Image inspection reveals a faint source within the Swift/XRT enhanced
error circle (Evans et al., GCN 22715) with coordinates:
RA(J2000) = 13:27:45.130
Dec(J2000)= +21:24:13.39
with an uncertainty of 0.2" in each coordinate.
The source is detected only r'-band and has magnitude r' = 25.0 mag
+-0.3 (AB), calibrated against r'-band SDSS field stars. No statement
about the variability can be made at this point. Further observations
are planned.
No correction for the expected Galactic foreground extinction
corresponding to a reddening of E_(B-V)=0.02 mag in the direction of the
burst (Schlafly & Finkbeiner 2011) has been applied.
We acknowledge the excellent support from the LBT-INAF staff,
particularly F. Cusano and A. Gargiulo in obtaining these observations.