SVOM follow-up on MAXI J1750-327/EP260812c

ATel #17993; F. Cangemi (APC, France), L. Tao (IHEP, China), A. Coleiro (APC, F), G. L. Huang (IHEP, C), P.-O. Petrucci (IPAG, F), L. Zhang (IHEP, C)
on 20 Aug 2026; 08:02 UT
Credential Certification: Floriane Cangemi (cangemi@apc.in2p3.fr)

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We report on SVOM Target-of-Opportunity (ToO) follow-up observations of MAXI J1750-327/EP260812c, a new black hole transient discovered by MAXI/GSC (ATel #17963) and Einstein Probe/WXT (ATel #17964) on August 12, 2026 (see also ATels #17969, #17971, #17974, #17977, #17978, #17979, #17983, #17988, and #17990). SVOM observed the source at the position RA = 267.5123 deg, Dec = -32.7123 deg on August 15, 2026.

A preliminary joint spectral analysis of the SVOM/MXT (exposure of 4780 s) and SVOM/ECLAIRs (exposure of 6085 s) data shows that the 0.6-120 keV spectrum obtained is well described (chi2/dof = 1331.24/988) by an absorbed cutoff power-law model, with a hydrogen column density of N_H = (0.731 +/- 0.008)e22 cm-2, a photon index of Gamma = 1.67 +/- 0.02, and a cutoff energy of Ecut = 29.5 (+1.0/- 0.9) keV. The absorbed 0.6-120 keV flux is (9.94 +0.09 / -0.10)e-8 erg/cm2/s. All uncertainties are quoted at the 90% confidence level. The derived spectral parameters are typical of a black hole X-ray binary in the hard state.

Further SVOM observations are scheduled to monitor the evolution of the source.

The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by APC, CEA, CNES and IRAP.