[vsnet-grb-info 25659] GRB 200519A: LCO Optical Afterglow Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27759
SUBJECT: GRB 200519A: LCO Optical Afterglow Detection
DATE:    20/05/19 17:04:42 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 200519A (Sbarufatti et al., GCN 27756) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory Australia site, on May 9, from 12:39 to 13:02 UT (corresponding to 1.05 to 1.38 hours from the GRB trigger time) with the Bessel R and I filters.

We performed a series of 5x120s exposures in R and I. We detect an optical source in stacked images at the UVOT afterglow candidate position position.  Using the USNO-B.1 catalog as reference, we calculate the following magnitudes:

R = 17.07 +/- 0.02

I = 16.69 +/- 0.02

These magnitudes are not corrected for galactic extinction.

R.S. is funded by NSF AST grant #1831682