Hard X-ray emission from the transient source XTE J2012+381 detected with INTEGRAL

ATel #15844; M. Fiocchi, A. Bazzano, P. Ubertini (INAF-IAPS Roma, Italy), J. Chenevez (DTU Space, Denmark), J. Rodriguez (CEA, France), A. J. Bird, V. A. Lepingwell, P. Charles (Univ. of Southampton, UK), L. Bassani, A. Malizia, N. Masetti, V. Sguera, (INAF-OAS Bologna, Italy), M. Molina (INAF-IASF Milano, Italy), A. Bodaghee (Georgia College and State University, USA), on behalf of the GPS team
on 4 Jan 2023; 18:10 UT
Credential Certification: mariateresa fiocchi (mariateresa.fiocchi@iaps.inaf.it)

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The transient X-ray source XTE J2012+381 was discovered in 1998 by the All Sky Monitor onboard the Rossi X-ray Timing Explorer and reported as a black hole candidate (White et al. 1998*; Vasiliev, Trudolyubov, and Revnivtsev 2000**). It has been recently observed in outburst by MAXI/GSC (ATEL #15826), XRT/SWIFT (ATEL #15827) and NICER (ATEL #15829), in soft X-rays up to 10 keV.
During the recent INTEGRAL Galactic Plane Scanning observations (PI: Angela Bazzano, revolution 2587) performed between 2022-12-25 01:32:49 UTC and 2022-12-25 14:53:40 UTC (effective exposure time of 40 ks) this transient source (XTE J2012+381) has been detected with the IBIS/ISGRI instrument (in hard X-rays, 30-100 keV) with a significance of 18-sigma and at coordinates R.A.(J2000) = 20h 12m 42s and Decl.(J2000) = +38d 10' 32'' (positional error of 1.9'). Its spectrum, with an exposure time of 25.7 ks, is well fitted with a power-law model (reduced chi-squared = 1.3) with a spectral index of 2.4+/-0.3 and a flux of (1.8+/-0.1)x10^-10 ergs cm-2 s-1 and (1.8+/-0.3)x10^-10 ergs cm-2 s-1 in the 30-50 keV and 50-100 keV energy range, respectively.
During the revolution 2587, the source is only partly covered by JEM-X instrument for a combined effective exposure of 5 ks. It is detected at 12.4 sigmas with the following fluxes: 40 +/-5 mCrab and 40 +/-13 mCrab in the 3-10 keV and 10-25 keV energy band, respectively.
All the data have been analyzed using the Offline Software Analysis version 11 (OSA11).
Results from the Galactic Plane Scanning are made publicly available at: http://gps.iaps.inaf.it
*IAU Circ., No. 6927, #2 (1998)
**Astronomy and Astrophysics, 362, 53