AGILE prompt follow-up of the LIGO/Virgo GW trigger event S190408an

In response to the first public LIGO/Virgo gravitational wave (GW) alert of the on-going osservative run O3, with trigger event named S190408an at T0 = 2019-04-08 18:18:02 (UT), the AGILE Team performed a quick look follow-up analysis of the AGILE data.
No gamma-ray counterpart candidates were found within the analyzed time intervals around T0, and preliminary flux upper limits were estimated for both the MCAL and the GRID instruments.

The results have been promptly published in 3 GCN CIRCULARS (F. Lucarelli et al.):

GCN #24063: LIGO-Virgo S190408an: AGILE MCAL observations
GCN #24071: LIGO-Virgo S190408an: AGILE GRID observations
GCN #24080: LIGO-Virgo S190408an: further AGILE GRID observations after T0

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