[vsnet-grb-info 20440] GRB 180325A: prompt REM optical/NIR detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Mar 25 12:50:42 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 22536
SUBJECT: GRB 180325A: prompt REM optical/NIR detection
DATE: 18/03/25 03:50:18 GMT
FROM: Paolo D'Avanzo at INAF-OAB <paolo.davanzo at brera.inaf.it>
P. D'Avanzo, A. Melandri, S. Covino, D. Fugazza (INAF/OAB) report on behalf of the REM team:
We observed the field of the GRB 180325A (Troja et al., GCN 22532) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile).
The observations started on 25-03-2018 at 01:53:52 UT, 50s after the burst, and were carried in the g, r, i, z, J, H and K bands.
A preliminary analysis shows that the optical counterpart (Troja et al., GCN 22532; Guidorzi et al. GCN 22534; Heintz et al. GCN 22535) is well detected
and at a mid time of 123 seconds after the burst it was:
r = 17.2 +/- 0.2 (AB)
H = 12.7 +/- 0.1 (Vega)
Magnitudes are calibrated against the SDSS (optical) and 2MASS (NIR) catalogues.
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