Swift observations of 4FGL J1102.6+5251
ATel #15337; P. Romano (INAF-OAB), S. Baitieri (Uni Bicocca, INAF-OAB), S. Vercellone, L. Foschini (INAF-OAB), P. A. Evans (UL)
on 19 Apr 2022; 16:52 UT
Credential Certification: Pat Romano (romano@ifc.inaf.it)
Subjects: Optical, Ultra-Violet, X-ray, AGN
We report the preliminary results of the observations performed by the Neil Gehrels Swift Observatory on the source 4FGL J1102.6+5251 (GB6 J1102+5249, z=0.68984). This source was recently re-classified by Foschini et al 2021 (Univ.,7,372) as a candidate gamma-ray narrow-line Seyfert 1 (g-NLS1). No previous X-ray observations of this source were available.
The Swift observation (net exposure about 4.6 ks) took place starting on 2022-04-18 at 18:22:53 (MJD 59687.765956). The source was detected at the following coordinates:
RA/Dec(J2000) = 165.7078, +52.8371 which is equivalent to:
RA(J2000) = 11h 02m 49.86 s,
Dec(J2000) = +52d 50m 13.6 s
with an estimated uncertainty of 4.6 arcsec (radius, 90% confidence), which is 0.9 arcsec from the SDSS(DR6) position of GB6 J1102+5249.
We name this X-ray counterpart of GB6 J1102+5249 as Swift J110249.9+525014.
We fit the XRT/PC spectrum (4613 s) with an absorbed power law, and obtained an absorbing column consistent with the Galactic one NHGal =9.20x10^19 cm-2, a photon index of 1.5 (+0.9, -0.6) and an average absorbed flux 3.2 (+2.0, -1.4) x10^-13 erg/s/cm^2 (0.3-10 keV).
The UVOT observed the field simultaneously with the XRT in the following optical and UV filters
MJD+/-MJDerr filter mags+/-mags_e (stat) +/-mags_esys (sys)
59687.8443+/-0.0652 V >19.62
59687.8372+/-0.0663 B 19.89+/-0.21 (stat) +/-0.02 (sys)
59687.8357+/-0.0665 U 19.47+/-0.22 (stat) +/-0.02 (sys)
59687.8335+/-0.0675 W1 19.62+/-0.23 (stat) +/-0.03 (sys)
59687.8470+/-0.0662 M2 19.02+/-0.12 (stat) +/-0.03 (sys)
59687.8404+/-0.0678 W2 19.15+/-0.09 (stat) +/-0.03 (sys)
The magnitudes are not corrected for Galactic extinction.
We warmly thank B. Chenko, J.A. Kennea, B. Sbarufatti, the Science Planners, and the Observatory Duty Scientists for having scheduled these observations.
