[vsnet-grb-info 27497] GRB 210306A: LCO Optical Afterglow Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Mar 6 16:42:07 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29600
SUBJECT: GRB 210306A: LCO Optical Afterglow Detection
DATE: 21/03/06 07:40:57 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 210306A (D'Elia et al., GCN 29597) with the LCO 1-m Sinistro instrument at the McDonald Observatory, Texas, USA site, on March 6, from 06:49 to 07:06 UT (corresponding to 2.93 to 3.22 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 4x120s 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 (D'Elia et al., GCN 29597), in agreement with other optical afterglow detections (Watson et al., GCN 29598; Romanov, GCN 29599). Using the USNO-B.1 catalog as reference, we calculate the following magnitudes:
R = 19.00 +/- 0.02
I = 17.70 +/- 0.03
These magnitudes are not corrected for galactic extinction. The fainter R magnitude could indicate a moderately high redshift.
R.S. is funded by NSF AST grant #1831682
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