[vsnet-grb-info 23850] GRB 191004B: Optical Afterglow Detection with LCO
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Oct 5 08:57:01 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 25949
SUBJECT: GRB 191004B: Optical Afterglow Detection with LCO
DATE: 19/10/04 23:55:39 GMT
FROM: Robert Strausbaugh at U. of the Virgin Islands <robert.strausbaugh at 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 observed Swift GRB 191004B (Palmer et al., GCN 25947) with
the LCO 1-m Sinistro instrument on September 4, from 21:50 to 22:07 UT
(corresponding to 0.11 to 0.4 hours from the GRB trigger time)
with the Bessel R filter.
We performed a series of 5x180s exposures, and we detect a source not present in either USNO-B1.0 or 2MASS surveys consistent with the optical afterglow location (Palmer et al., GCN 25947
) with the following magnitude:
R = 18.07 +/- 0.02
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.
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