GCN Circular 26977
Subject
GRB 200131A: Further RATIR Optical Observations
Date
2020-02-03T19:22:08Z (4 years ago)
From
Nat Butler at Az State U <natbutler@asu.edu>
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC),
William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J.
Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI),
Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz
(UCSC), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey
Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki
Toy (UMD) report:
We observed the field of GRB 200131A (Sbarufatti et al., GCN 26953) with
the Reionization and Transients Infrared Camera (RATIR; www.ratir.org)
on the 1.5m Harold Johnson Telescope at the Observatorio Astron��mico
Nacional on Sierra San Pedro M��rtir from 2020/02 2.10 to 2020/02 2.17
UTC (27.70 to 29.45 hours after the BAT trigger), obtaining a total of
1.42 hours exposure in the r and i bands, and from 2020/02 3.10 to
2020/02 3.12 UTC (51.69 to 52.28 hours after the BAT trigger), obtaining
a total of 0.49 hours exposure in the r and i bands.
The optical transient (Lipunov et al., GCN Circ. 26954, Butler et al.,
GCN Circ. 26957, Strausbaugh et al., GCN Circ. 26959, Gokuldass et al.,
GCN Circ. 26960, Pozanenko et al., GCN Circ. 26964 & 26965) is detected
on 2020/02/02 with:
r = 21.39 +/- 0.11
i = 21.39 +/- 0.07
and on 2020/02/03 with:
r = 22.26 +/- 0.29
i = 22.45 +/- 0.35
These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.