TITLE: GCN CIRCULAR NUMBER: 25686 SUBJECT: ZTF19abvizsw/AT2019pim, search for GRB in SPI-ACS/INTEGRAL data DATE: 19/09/08 15:12:03 GMT FROM: Alexei Pozanenko at IKI, Moscow I. Chelovekov, A. Pozanenko, P. Minaev, S. Grebenev on behalf of the IKI GRB FuN collaboration report: Using SPI-ACS/INTEGRAL data we performed a search for a possible GRB which can be a source of the orphan transient ZTF19abvizsw discovered and observed in optic (Kool et al., GCN 25616; Burdge et al., GCN 25639; Wei et al., GCN 15640; Perley et al., GCN 25643; Belkin GCN 25683). The search was performed in a time window between the last ZTF non-detection (2019-09-01 UT 07:35) and the discovery of ZTF19abvizsw/AT2019pim (2019-09-02 03:08). The SPI-ACS was switch off at low orbit radiation belts pass between 2019-09-01 09:09:36 - 2019-09-01 19:28:44, and operating normally in other time intervals. A blind search for impulsed events was performed on two time scales, 1s and 5 s. We found following candidates for long duration GRBs. Below we present UTC time of the trigger, light curve figure and comment. Some event data is also presented in the figures. 1. UTC: 2019-09-01T07:24:05 ref: http://193.232.11.154/ZTF19abvizsw_binned/png/213100540010.000_acs_lc_T1__00452_00515.png 2019-09-01T07:24:05 comment: not visible in GBM 2. UTC: 2019-09-01T21:24:43 ref: http://193.232.11.154/ZTF19abvizsw_binned/png/213200030010.000_acs_lc_T1__00043_00071.png comment: might be coinciding with the tail of GBM trigger bn190901890 at 2019-09-01 21:19:37.514 3. UTC: 2019-09-02T01:36:16 ref: http://193.232.11.154/ZTF19abvizsw_binned/png/213200070010.000_acs_lc_T1__01320_01395.png comment: no GBM data yet comment: the event is also triggered IBAS One more triggered event at 2019-09-01T19:32:19 is most probably geophysical origin because of coincidence with IREM channel of e- with energies more than 500 keV. We also note the absence of any trigger in GBM data at that time. We do not consider it as a candidate, we plot it only for the reference. ref: http://193.232.11.154/ZTF19abvizsw_binned/png/213200010010.000_acs_lc_T1__00205_00256.png