TITLE: GCN CIRCULAR NUMBER: 14484 SUBJECT: GRB 130427A: SPI-ACS/INTEGRAL observations DATE: 13/04/28 06:38:27 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Pozanenko (IKI), P. Minaev (IKI), A. Volnova (IKI) report: The SPI-ACS detector (> 80 keV) of INTEGRAL observatory was triggered by the Swift GRB 130427A (Maselli et al., GCN 14448) on (UT) T0=07:47:06.36. Light curve of the GRB 130427A (http://www.isdc.unige.ch/integral/ibas/cgi-bin/ibas_acs_web.cgi) consists of the first peak of ~ 1 s duration which coincides with bright optical emission detected by RAPTOR (Wren et al., GCN 14476). This peak is also clearly visible in the BAT light curve at ~T0_BAT-51 s ( http://gcn.gsfc.nasa.gov/notices_s/554620/BA/ ). Following the first peak extremely intense emission was detected coinciding with BAT/Swift and Fermi-LAT detection (Zhu et al., GCN 14471). The emission in SPI-ACS detector is significantly detectable at least up to 100 s after T0. The SPI-ACS light curve can be also found at http://grb.rssi.ru/GRB130427A/GRB130427A_SPI-ACS.png