LIGO/Virgo S200115j: upper limits from AGILE/GRID observations

In response to the LIGO-Virgo GW event S200115j at T0 = 2020-01-15 04:23:09.753 UTC a preliminary analysis of the AGILE exposure at T0 shows that the Gamma-Ray Imaging Detector (GRID) exposure covered less than 10% of the 90% c.l. localization region (LR) (46% of 90% c.l. localization region (LR) is occulted by Earth). We performed an analysis of the GRID data in the energy range 50 MeV - 10 GeV over time intervals before and after T0, where good exposure of the S200115j 90% c.l. LR was available. No candidate gamma-ray transient was detected. The following preliminary GRID values of 3-sigma upper limit (UL) are obtained: from 1.2e-07 to 3.6e-07 erg cm^-2 s^-1, with exposure of about 34% of the LR over the time interval ( T0 - 200s ; T0 - 100s ); from 3.9e-08 to 8.7e-06 erg cm^-2 s^-1, with exposure of about 32% of the LR over the time interval ( T0 + 200s ; T0 + 300s ). These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress.