INTEGRAL observation of the nuclear transient AT2019pev and the TDE candidate AT2019qiz

ATel #13170; C. Ferrigno V. Savchenko, E. Bozzo, L. Ducci (ISDC, Unige CH) E. Kuulkers (ESTEC/ESA, NL), C. Sanchez-Fernandez (ESAC/ESA, Spain)
on 7 Oct 2019; 20:38 UT
Credential Certification: Carlo Ferrigno (Carlo.Ferrigno@unige.ch)

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Following the detection of the nuclear transient AT2019pev (ATeL #13127, #13132, #13163), INTEGRAL performed a target of opportunity observation in spacecraft revolution 2143 (from 2019-10-01 02:26:21 to 2019-10-03 05:06:15 UTC) with a total observation time of 176 ks.

We derive the following 3-sigma upper limits on the flux of AT2019pev:
3-10 keV: 1 mCrab = 1.6e-11 erg/s/cm^2; L < 3e44 erg/s
28-40 keV: 2 mCrab = 8e-12 erg/s/cm^2; L < 1.6e44 erg/s
40-80 keV: 3 mCrab = 2e-11 erg/s/cm^2; L < 4e44 erg/s
which are compatible with the measurements performed with NICER (ATeL #13132) and Chandra (ATel #13163). The limits are close to the extrapolation of the NICER measurement with the reported powerlaw spectrum of -2 and therefore disfavour any harder spectrum. The luminosity limit is estimated for a redshift of 0.096.

We also derive 3-sigma upper limits on the hard X-ray emission of the tidal disruption event candidate AT2019qiz (ATeL #13131, #13143, #13146), which is located in the partially coded ISGRI field of view and outside the JEM-X reach. They are:
28-40 keV: 4 mCrab = 1.6e-11 erg/s/cm^2; L < 8e42 erg/s
40-80 keV: 6 mCrab = 4e-11 erg/s/cm^2; L < 2e43 erg/s
with luminosity limit computed for a redshift of 0.0151.