GCN Circular 25686
Subject
ZTF19abvizsw/AT2019pim, search for GRB in SPI-ACS/INTEGRAL data
Date
2019-09-08T15:12:03Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
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