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Possible X-ray Detection of Fermi J0035+6131

ATel #8783; D. Pandel (Grand Valley State University), P. Kaaret (The University of Iowa)
on 6 Mar 2016; 21:14 UT
Credential Certification: Dirk Pandel (pandeld@gvsu.edu)

Subjects: Radio, Optical, X-ray, Gamma Ray, Request for Observations, AGN, Binary, Blazar

Referred to by ATel #: 8789

The transient gamma-ray source Fermi J0035+6131, detected with the Fermi LAT in the Galactic plane on January 14, 2016 (ATel #8554), was observed with XMM-Newton on January 24, 2016. We detected two X-ray sources inside the Fermi LAT error region. The brighter of the two source has coordinates RA=8.85408°, Dec=61.50819° (J2000.0; position error 0.2 arcsec) and is positionally coincident with the radio source 87GB 003232.7+611352 which has been suggested as a likely counterpart of the gamma-ray source (ATel #8706). The source has an X-ray flux of (8.6±0.3)×10-13 erg cm-2 s-1 (0.5-10 keV), a photon index of 1.57±0.10, and a neutral hydrogen column density of (5.3±0.7)×1021 cm-2. The column density is consistent with that of the Galactic disk in this direction, suggesting that the source is extragalactic. The X-ray flux appears to be constant during the 11 ks XMM-Newton observation.

The second X-ray source is located at RA=8.96088°, Dec=61.45953° (J2000.0; position error 0.5 arcsec) and has a flux of (8.3±1.4)×10-14 erg cm-2 s-1 (0.5-10 keV), a photon index of 1.4±0.5, and a neutral hydrogen column density of (2.3±1.8)×1021 cm-2. The X-ray emission is likely associated with the B1 IV star HD 3191. The hard X-ray spectrum of the star suggests that it may be a binary.

Further multiwavelength observations of the two sources are encouraged.