TITLE: GCN CIRCULAR NUMBER: 23278 SUBJECT: INTEGRAL detections of the prompt gamma-ray emission of GRB 180914B DATE: 18/09/28 11:05:12 GMT FROM: Volodymyr Savchenko at ISDC,U of Geneve J. Rodi, A. Bazzano, P. Ubertini, L. Natalucci (IAPS-Roma) C. Ferrigno, V. Savchenko (ISDC, University of Geneva, CH) E. Kuulkers (ESTEC/ESA, The Netherlands) We have analyzed the public INTEGRAL data of IBIS/PICsIT (200 - 2600 keV) and SPI-ACS(>75 keV) in coincidence with the long, bright GRB 180914B, which was initially reported by AGILE/MCAL (GCN 23226), AGILE/GRID (GCN 23231), and Fermi/LAT(GCN 23232). The INTEGRAL orientation was 98.4 degrees from the GRB location and implies a near optimal response for SPI-ACS and a suppressed response for PICsIT (Savchenko et al. 2017, A&A 603, A46). The GRB was clearly detected in SPI-ACS until about T0+250s (T0=2018-09-14 18:23:02.22) and shows 8 flaring events, of which 7 show large variability detected down to the 50 ms time-resolution of the detector.  It was also detected in PICsIT until approximately T0+130s, of which 5 flaring events are clearly seen.  Because of the unfavorable viewing angle for PICsIT, the burst is predominately seen above 460 keV with significant emission up to 1.2 MeV. The SPI-ACS light curve can be found at: https://www.isdc.unige.ch/integral/ibas/cgi-bin/ibas_acs_web.cgi/?trigger=2018-09-14T18-23-01.00-00000-00000-0