GCN Circular 25977
Subject
GRB 191004B: Continued Optical Afterglow Monitoring with LCO
Event
Date
2019-10-07T20:11:14Z (7 years ago)
From
Robert Strausbaugh at U. of the Virgin Islands <robert.strausbaugh@uvi.edu>
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We obtained a second epoch (first epoch, GCN 25949) of Swift GRB 191004B (Palmer et al., GCN 25947) data with
the LCO 1-m Sinistro instrument at the Sutherland Site (SAAO) on September 5, from 2:40 to 3:03 UT
(corresponding to 4.95 to 5.3 hours from the GRB trigger time)
with the Bessel R and I filters.
We performed a series of 5x240s exposures, and we detect the afterglow with the following magnitudes:
R = 21.01 +/- 0.08
I = 19.91 +/- 0.08
This flux is calibrated against several USNO-B1.0 objects near the GRB location but is not corrected for Galactic Extinction.
These observations were possible thanks to the USVI NASA-EPSCoR
Research Infrastructure Development (RID) grant NNX16AL44A.