LIGO/Virgo S200311bg: Upper limits from Konus-Wind observations
Abstract
Konus-Wind (KW) was observing the whole sky at the time of the LIGO/Virgo event S200311bg (2020-03-11 11:58:53.398 UTC, hereafter T0; LIGO/Virgo Collaboration GCN Circ. 27358). No triggered KW GRBs happened between ~3 hours before and ~1.5 days after T0. Using waiting-mode data within the interval T0 +/- 100 s, we found no significant (> 5 sigma) excess over the background in both KW detectors on temporal scales from 2.944 s to 100 s. We estimate an upper limit (90% conf.) on the 20 - 1500 keV fluence to 8.2x10^-7 erg/cm^2 for a burst lasting less than 2.944 s and having a typical KW short GRB spectrum (an exponentially cut off power law with alpha =-0.5 and Ep=500 keV). For a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the corresponding limiting peak flux is 2.4x10^-7 erg/cm^2/s (20 - 1500 keV, 2.944 s scale). All the quoted values are preliminary.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2020
- Bibcode:
- 2020GCN.27487....1R