{
  "bibcode": "2020GCN.27627....1P",
  "body": "A. Pozanenko (IKI), P. Minaev (IKI), I. Chelovekov (IKI), S. Grebenev \n(IKI) report on behalf of GRB IKI FuN:\n\nWe analysed publicly available INTEGRAL data around the time of GRB \n200415A (Fermi GBM team, GCN 27579; Omodei et al., GCN 27586; Frederiks \net al., GCN 27596; Marisaldi et al., GCN 27622).  Direction to GRB \n200415A localization  by IPN (Svinkin et al., GCN 27585) and Fermi LAT \n(Omodei et al., GCN 27597) is 89 degrees off-axis for INTEGRAL \ntelescopes, which is nearly optimal for the SPI-ACS detector. This event \ndid not trigger IBAS (see \nhttp://www.isdc.unige.ch/integral/science/grb#ACS).\n\nThe GRB 200415A is clearly visible in SPI-ACS, IBIS/ISGRI and \nIBIS/PICsIT (for latter two - outside the FoV). Using IBIS/ISGRI we \nderived the GRB 200415A time interval from T0+0.38 up to T0+0.52, where \nT0 = 2020-04-15T08:48:05.56  (UT) is the trigger time of GRB Fermi.\n\nDuration of GRB 200415A is 0.20 s as seen in SPI-ACS and 0.14 c in \nIBIS/ISGRI in 30-500 keV energy band. The fluence of the event in \nSPI-ACS is 27800 +/- 300 cts, which is equivalent to 6.7��-6 ergs/cm2 in \n10-1000 keV energy (1.2��-6 -- 3.8��-5 ergs/cm2 is the 95% confident \nregion using calibration of SPI-ACS for short Pozanenko et al., \nAstronomy Letters, 45, 11, 710 (2019). The fluence of the event in ISGRI \nis  3.2 +/- 2.2e-6 ergs/cm2 (30-100 keV) and  3.7 +/- 2.4e-6 ergs/cm2 \n(100-500 keV) after calibration of ISGRI (Chelovekov et al., Astronomy \nLetters, 45, 10, 635 (2019).\nWe detected neither any precursor within 200 s prior the trigger, nor \nsignificant extended emission up to +100 s.\n\nLight curves of the GRB 200415A registered by INTEGRAL detectors can be \nfound at\nhttp://grb.rssi.ru/GRB200415A_ISGRI_PICSIT_ACS.png\n\nWe note a possible multi-pulse structure of the event as can be seen in \nthe IBIS/ISGRI light curve.\n\nWe also put the spectral data reported  (Bissaldi et al., GCN 27587; \nFrederiks et al., GCN 27596) onto E_iso -- E_p diagram (AKA Amati \nrelation) and EHD diagram (Minaev et al., MNRAS, 492, 1919 (2020).\n\nIf GRB 200415A is a real gamma-ray burst its redshift should be z > 0.03 \nas it is seen from the event trajectory in the diagrams.\n\nWe put the Giant Flare (GF) of SGR 1806-20 on 2004-12-27 on the E_iso -- \nE_p diagram and found that position of GRB 200415A, if its source in \nSculptor galaxy (NGC 253) at 3.5 Mpc,  is compatible with the position \nof the GF of SGR 1806-20 on 2004-12-27 (see Figures below).\n\nE_iso -- E_p diagram (AKA Amati relation) and EHD diagram can be found at\nhttp://grb.rssi.ru/GRB200415A/GRB200415A_Amati_SGR.png\nhttp://grb.rssi.ru/GRB200415A/GRB200415A_EHD_SGR.png",
  "circularId": 27627,
  "createdOn": 1587594798000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 200415A"
}