GCN Circular 30444
Subject
GRB 210704A: INTEGRAL observations
Date
2021-07-11T22:27:18Z (3 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Minaev, P., Pozanenko, A., Chelovekov, I., Grebenev, S. report on
behalf of GRB IKI FuN:
We report results of analysis of INTEGRAL observations of GRB 210704A.
We used publicly available data. GRB 210704A was initially reported by
X-/gamma-ray experiments (Ursi et al., GCN 30372; Berretta et al., GCN
30375; Prasad et al., GCN 30378; D'Ai et al., GCN 30379; Malacaria et
al., GCN 30380; Ridnaia et al., GCN 30388). The burst was detected by
SPI-ACS at (UTC) 2021-07-04T19:33:24.5. Its duration in the SPI-ACS
energy band (> 80 keV) is T_90 = 3.5 +/- 0.7 s. Comparing fluences of
long-duration GRBs simultaneously recorded by SPI-ACS and Fermi/GBM
(Chelovekov et al., in preparation) we estimated the GRB 210704A fluence
to be 1.8e-5 erg/cm^2 in the 10-1000 keV band (the 95% confidence region
which includes systematics was 5.2e-6 ��� 6.3e-5 erg/cm^2). We did not
detect any signature of an extended emission in the SPI-ACS energy band
(> 80 keV). GRB 210704A was also detected by ISGRI detector as 106
degrees off-axis event. The light curve of both SPI-ACS and ISGRI can
be found at
http://grb.rssi.ru/GRB210704A/GRB20210704A_ISGRI_ACS.png
