LIGO/Virgo S200225q: Upper limits from Konus-Wind observations
Abstract
Konus-Wind (KW) was observing the whole sky at the time of the LIGO/Virgo event S200225q (2020-02-25 06:04:21.397 UTC, hereafter T0; LIGO/Virgo Collaboration GCN Circ. 27193). No triggered KW GRBs happened between ~1 day before and ~2 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 5.6x10^-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 1.6x10^-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.27485....1R