[vsnet-grb-info 25356] GRB 200325B: LCO Optical Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Mar 28 00:27:47 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 27456
SUBJECT: GRB 200325B: LCO Optical Detection
DATE: 20/03/27 15:26:37 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 Fermi GRB 200325A (Fermi GBM Team, GCN 27441) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on March 27, from 12:08 to 12:48 UT (corresponding to 45.25 to 45.92 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x240s exposures in R and I. We detect a source consistent with other optical detections (Lipunov et al., GCN 27446, Pozanenko et al., GCN 27452) in stacked images. Using the USNO-B.1 catalog as reference, we obtain the following magnitudes:
R = 21.36 +/- 0.11
I = 20.52 +/- 0.13
These magnitudes are not corrected for Galactic Extinction.
R.S. is funded by NSF AST grant #1831682
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