Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 26197

ZTF19abvizsw: Upper limits from Konus-Wind observations
2019-11-07T08:18:07Z (5 years ago)
Anna Kozlova at Ioffe Institute <>
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks,
M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline
on behalf of the Konus-Wind team, report:

Konus-Wind (KW) was observing the whole sky during a day before
discovery of ZTF19abvizsw (2019-09-02 04:19:12 UTC;
Kool et al., GCN Circ. 25616) including the time of TESS detection
(2019-09-02 03:15 UTC, hereafter T0; Fausnaugh et al., GCN Circ. 25982)

One triggered and one waiting-mode KW events were detected during
~1-day interval before T0. The burst localizations are inconsistent
with the ZTF19abvizsw.

For the interval excluding the KW events, we estimate
an upper limit (90% conf.) on the 20 - 1500 keV fluence to
6.3x10^-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 1.3x10^-7 erg/cm^2/s (20 - 1500 keV, 2.944 s 

Assuming the redshift z=1.26 (Burdge et al. GCN circ. 25639)
and a standard cosmology model with H_0 = 67.3 km/s/Mpc,
Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014),
we estimate an upper limit on a long GRB peak luminosity L_iso ~
1.3x10^51 erg/s.

All the quoted values are preliminary.
Looking for U.S. government information and services? Visit