TITLE:   GCN CIRCULAR
NUMBER:  25189
SUBJECT: LIGO/Virgo S190728q: SPI-ACS/INTEGRAL data analysis
DATE:    19/07/28 09:26:53 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

P. Minaev (IKI), A. Pozanenko (IKI),  I. Chelovekov (IKI), S. Grebenev 
(IKI)  on behalf of IKI GRB FuN collaboration report:

Using SPI-ACS/INTEGRAL public  data  we performed a search for 
counterpart of S190728q (LVC, GCN 25187).  We found significant excesses 
at +/- 100 sec around event time T0=2019-07-28T06:45:10.567644:

time after T0, duration, significance, fluence, assumed Eiso
-11.5, 1 s, 4.2 sigma,  (1.7 +/- 0.4)*10e-7 erg/sm, (1.1 +/-0.3)*10e49 erg
42.5 s, 1 s, 3.5 sigma, (1.4 +/- 0.4)*10e-7 erg/sm2, (0.88+/-0.26)*10e49 erg

The fluence of the excesses is calculated for the angle of 74 degrees 
toward most probable area of localization (LVC, GCN 25187). Eiso is 
calculated assuming luminosity distance of 795   Mpc (LVC, GCN 25187).

The light curve of SPI-ACS can be found at 
http://grb.rssi.ru/S190728q/S190728q_SPI-ACS_1sec_LC.png