[vsnet-grb-info 27328] GRB 210207B: LCO Optical Afterglow Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Feb 9 01:57:04 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29431
SUBJECT: GRB 210207B: LCO Optical Afterglow Detection
DATE: 21/02/08 16:56:16 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 210207B (Lien, GCN 29420) with the LCO 1-m Sinistro instrument at the McDonald Observatory, Texas, USA site, on February 8, from 11:23 to 11:34 UT (corresponding to 13.30 to 13.48 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x60s exposures in R and I. We clearly detect an optical source in R and I band in stacked images at a location consistent the initial UVOT detection (Lien, GCN 29420). Using the USNO-B.1 catalog as reference, we calculate the following magnitudes:
R = 20.24 +/- 0.13
I = 20.56 +/- 0.24
These magnitudes are not corrected for galactic extinction. A quick catalog search found no galaxies at this brightness at this location. Further observations are encouraged.
R.S. is funded by NSF AST grant #1831682
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