GCN Circular 27456
Subject
GRB 200325B: LCO Optical Detection
Date
2020-03-27T15:26:37Z (4 years ago)
From
Robert Strausbaugh at U. of the Virgin Islands <robert.strausbaugh@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