LIGO/Virgo S190630ag: No counterpart candidates in INTEGRAL SPI-ACS prompt observation. Coleiro, A. ; Onori, F. ; Savchenko, V. ; Ferrigno, C. ; Rodi, J. ; Mereghetti, S. Abstract Publication: GRB Coordinates Network Pub Date: 2019 Bibcode: 2019GCN.24925....1C