[vsnet-grb-info 19340] GRB 170424A: LCO Observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Apr 26 05:24:22 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 21037
SUBJECT: GRB 170424A: LCO Observations
DATE: 17/04/25 20:23:46 GMT
FROM: Antonino Cucchiara at UVI <antonino.cucchiara at uvi.edu>
A. Cucchiara, D. Morris (U. of Virgin Islands), C. Guidorzi
(U. Ferrara), B. Gendre (U. of Virgin Islands),
reports on behalf of a larger collaboration:
"On April 25.12 UT (T_0 +14.5h) we began observing the center
of the field of LAT GRB 170424A (Omodei et al. GCN #21032)
using the Las Cumbres Observatory 1m Sutherland facility.
We covered 30% of the LAT error region and we obtained a series
of observations in R and I band for a total of 6 minutes on sky in
each filter.
We identified no optical counterpart within the center of Swift-XRT
tile #20753 (Evans et al. GCN #21034), out to a radius of ~13 arcmin,
at the following 3-sigma limits:
R > 21.2 mag
I > 20.8 mag
These magnitude are calibrated against nearby USNO-B1 sources,
and are not corrected for Galactic Extinction."
Antonino Cucchiara, PhD
Assistant Professor
Physics and Astronomy
University of the Virgin Islands
Phone: 340-693-1688
College of Science and Mathematics
#2 Brewers Bay road
St. Thomas, USVI 00802
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