[vsnet-grb-info 21404] GRB181201A: GOTO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23503
SUBJECT: GRB181201A: GOTO optical observations
DATE:    18/12/04 14:09:38 GMT
FROM:    Danny Steeghs at U.of Warwick/GOTO  <dsteeghs at gmail.com>

G.Ramsay (Armagh O.), J.Lyman, K.Ulaczyk, D.Steeghs, K.Wiersema
(U. Warwick), M.Dyer (U. Sheffield), B.Gompertz, A.Levan, R.Cutter
(U. Warwick) K. Ackley, D.Galloway, E.Rol (Monash U.), V.Dhillon
(U. Sheffield), P.O'Brien, R.Starling (U. Leicester), S.Poshyachinda
(NARIT), D.Pollacco (U. Warwick), E.Thrane (Monash U.), E.Palle (IAC)

report on behalf of the GOTO collaboration:

The Gravitational-wave Optical Transient Observer observed the field
of the long duration GRB 181201A (Mereghetti et al. GCN Circ. 23469,
Page et al. GCN Circ. 23474) from Roque de los Muchachos Observatory.

We report two optical photometric detections, both made using a
combined L-band image (400-700nm passband), each with a total exposure
time of 300s.  The resulting preliminary magnitudes are based on a
comparison to Panstarrs g-band calibrators and include a systematic
error component due to the calibration uncertainty.

midpoint                 time elapsed since burst   g
2018-12-01 19:33:18 UT   0.705 days                 17.74+/-0.10 mag
2018-12-03 19:41:21 UT   2.711 days                 19.48+/-0.15 mag

GOTO is operated at the La Palma observing facilities of the
University of Warwick on behalf of a consortium including the
University of Warwick, Monash University, Armagh Observatory, the
University of Leicester, the University of Sheffield, the National
Astronomical Research Institute of Thailand (NARIT) and the Instituto
de Astrofisica de Canarias (IAC) (https://goto-observatory.org/)