TITLE: GCN CIRCULAR NUMBER: 17110 SUBJECT: GRB 141121A: SPI-ACS/INTEGRAL observations DATE: 14/11/28 18:10:04 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Pozanenko (IKI), P. Minaev (IKI), V. Vybornov (IKI), A. Volnova (IKI), E. Mazaeva (IKI) report: We inspected the SPI-ACS data of INTEGRAL observatory covering trigger time of the Swift GRB 141121A (Lien et al., GCN 17075) and MAXI/GSC (Honda et al., GCN 17077). At the BAT/Swift trigger time of the GRB 141121A (UT) T0=03:50:43 we do not found any significant emission above background in SPI-ACS data in different time scales (0.05 s, 5 s, and 50 s). We also do not find any activity at the second BAT episode (T0+550 s to T0+675 s). At the time of about T0-800 s we found in SPI-ACS data the activity corresponding to the first Konus-Wind episode (Golenetskii et al., GCN 17108). The duration of the activity is about 200 s and clearly visible in SPI-ACS light curve. The start time of the maximal count rate of SPI-ACS light curve (binning with 50 s bin duration) is T0-725 s. In both cases TO and T0-725 s the boresight of SPI-ACS is the same and equal to 119 degrees. If this episode is related to the GRB 141121A and taking into account SPI-ACS energy threshold (>~ 80 keV) one can suggest the this episode of GRB 141121A is harder than main activity detected by BAT/Swift. We do not detect any significant activity at the time of the MAXI/GSC detection (Honda et al., GCN 17077). The SPI-ACS light curves can be found at http://grb.rssi.ru/GRB141121A/grb141121_spi-acs_50sec.png http://grb.rssi.ru/GRB141121A/grb141121_spi-acs_5sec.png