GCN Circular 14484
Subject
GRB 130427A: SPI-ACS/INTEGRAL observations
Event
Date
2013-04-28T06:38:27Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), P. Minaev (IKI), A. Volnova (IKI) report:
The SPI-ACS detector (> 80 keV) of INTEGRAL observatory was triggered by the
Swift GRB 130427A (Maselli et al., GCN 14448) on (UT) T0=07:47:06.36. Light
curve of the GRB 130427A
(http://www.isdc.unige.ch/integral/ibas/cgi-bin/ibas_acs_web.cgi) consists
of the first peak of ~ 1 s duration which coincides with bright optical
emission detected by RAPTOR (Wren et al., GCN 14476). This peak is also
clearly visible in the BAT light curve at ~T0_BAT-51 s (
http://gcn.gsfc.nasa.gov/notices_s/554620/BA/ ). Following the first peak
extremely intense emission was detected coinciding with BAT/Swift and
Fermi-LAT detection (Zhu et al., GCN 14471). The emission in SPI-ACS
detector is significantly detectable at least up to 100 s after T0.
The SPI-ACS light curve can be also found at
http://grb.rssi.ru/GRB130427A/GRB130427A_SPI-ACS.png