GRB 190701B

D.Gotz (CEA, Saclay), S.Mereghetti (INAF, IASF-Milano), C.Ferrigno,
E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC,
Versoix) and J.Borkowski (CAMK, Torun) report:

a gamma ray burst lasting about 23 s has been detected by IBAS in the
IBIS/ISGRI data at 10:04:58  UT of July 1st, 2019.

The refined coordinates (J2000) are:

R.A.= 350.4091 deg
DEC.= +64.3457 deg
with an uncertainty of  1.1 arcmin (90% c.l.).

The burst had a peak flux of 0.1  photons/cm2/s (20-200 keV, 1-s integration  time) 
and a fluence in the same energy range of about 5.e-8 erg/cm2.

A plot of the light curve will  be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html

A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks,
M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline
on behalf of the Konus-Wind team, report:

The long-duration GRB 190701B (IBAS detection: Gotz et al., GCN 24936
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triggered Konus-Wind at T0=36303.292 s UT (10:05:03.292).

The burst light curve shows a multi-peaked structure
which starts at ~T0-3.3 s and has a total duration of ~13 s.
The emission is seen up to ~1.3 MeV.

As observed by Konus-Wind, the burst
had a fluence of 3.51(-0.46,+0.70)x10^-6 erg/cm2,
and a 64-ms peak energy flux, measured from T0-0.072 s,
of 1.39(-0.63,+0.68)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-integrated spectrum of the burst
(measured from T0 to T0+16.640 s)
is best fit in the 20 keV - 1.3 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with�� alpha = -1.43(-0.33,+0.41),
and Ep = 112(-30,+64) keV (chi2 = 48/60 dof).
Fitting by the GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index:
beta < -2.17 (chi2 = 48/59 dof).

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB190701_T36303/

All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.