[vsnet-grb-info 21650] GRB 190114C: COATLI Optical Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23749
SUBJECT: GRB 190114C: COATLI Optical Detection
DATE:    19/01/17 17:53:43 GMT
FROM:    Alan M. Watson at Instituto de Astronomia UNAM  <alan at astro.unam.mx>

Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Diego
González (UNAM), William H. Lee (UNAM), Margarita Pereyra (UNAM), Carlos
Román-Zúñiga (UNAM), Alexander Kutyrev (GSFC), and Eleonora Troja
(GSFC) report:

We observed the field of GRB 190114C (Gropp et al., GCN Circ. 23688)
with the COATLI 50-cm telescope and interim imager at the Observatorio
Astronómico Nacional on the Sierra de San Pedro Mártir
(http://coatli.astroscu.unam.mx) from 2019-01-17 02:25 to 2019-01-17
07:56 (from 53.7 to 59.2 hours after the trigger), obtaining a total of
2.93 hours of exposure in the w filter.

We detect a source coincident with the enhanced XRT position (Osborne et
al., GCN Circ. 23704) and possible host galaxy (de Ugarte Postigo et
al., GCN Circ. 23692) with w = 20.32 +/- 0.07.

Our w magnitudes are calibrated against the USNO-B1 catalog (adjusted to
an approximate AB system) and are not corrected for Galactic extinction
in the direction of the GRB.

We thank the COATLI technical team (Fernando Ángeles, Oscar Chapa,
Salvador Cuevas, Alejandro Farah, Jorge Fuentes, Rosalía Langarica,
Fernando Quirós, and Carlos Tejada) and the staff of the Observatorio
Astronómico Nacional.