[vsnet-grb-info 27356] GRB 210210A: LCO Optical Afterglow Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Feb 11 01:26:30 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29459
SUBJECT: GRB 210210A: LCO Optical Afterglow Detection
DATE: 21/02/10 16:24:44 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 210210A (Laha, GCN 29444) with the LCO 1-m Sinistro instrument at the McDonald Observatory, Texas, USA site, on February 10, from 11:31 to 12:02 UT (corresponding to 9.52 to 10.04 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x180s 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 (Laha, GCN 29444). Using the USNO-B.1 catalog as reference, we calculate the following magnitudes:
R = 19.62 +/- 0.05
I = 19.10 +/- 0.06
These magnitudes are not corrected for galactic extinction.
R.S. is funded by NSF AST grant #1831682
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