Swift observations of SDSS J102906.69+555625.2 and SDSSJ152205.41+393441.3

ATel #16031; P. Romano, S. Vercellone, L. Foschini (INAF-OAB), M. Berton (ESO), E. Jarvela (U. Oklahoma)
on 8 May 2023; 16:55 UT
Credential Certification: Pat Romano (romano@ifc.inaf.it)

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We report preliminary results of the observations performed by the Neil Gehrels Swift Observatory on SDSS J102906.69+555625.2 (z=0.451) and SDSS J152205.41+393441.3 (z=0.077), two narrow-line Seyfert 1 galaxies detected at 37 GHz (Lahteenmaki et al, 2018, A&A, 614, L1; Berton et al. 2020, A&A 636, A64) for which only 3 sigma ULs (ROSAT, 0.2-2 keV) were previously available at about 3E-13 erg/cm2/s and 2E-13 erg/cm2/s, respectively.

SDSS J102906.69+555625.2.
The X-ray observations (net exposure about 4.5 ks) took place starting on 2023-05-04 at 02:52:31 (MJD 60068.11980). The source was detected at the following coordinates:
RA/Dec(J2000) = 157.2797, 55.9399 which is equivalent to:
RA(J2000) = 10h 29m 07.13s,
Dec(J2000) = +55d 56m 23.6s
with an estimated uncertainty of 4.6 arcsec (radius, 90% confidence), 4 arcsec from the SDSS(DR6) position. We name this X-ray counterpart of SDSS J102906.69+555625.2 as Swift J102906.7+555625.

We fit the XRT/PC spectrum with an absorbed power law, and obtained an absorbing column consistent with the Galactic one NHGal =6.25E19 cm-2, a photon index of 2.3 (+0.6, -0.4) and an average absorbed flux 2.79 (+1.12, -0.80) 10^-13 erg/cm2/s (0.3-10 keV).

The UVOT observed the field simultaneously with the XRT in the following UV filters:
MJD+/-MJDerr filter mags+/-mags_e (stat) ±mags_esys (sys)
60068.5606+/-0.4359 W1 17.95+/-0.05 (stat) +/-0.03 (sys)
60068.5591+/-0.4368 M2 17.89+/-0.06 (stat) +/-0.03 (sys)
60068.5573+/-0.4374 W2 17.90+/-0.05 (stat) +/-0.03 (sys)
The magnitudes are not corrected for Galactic extinction.

SDSSJ152205.41+393441.3.
The X-ray observations (net exposure about 4.8 ks) took place starting on 2023-05-04 at 01:41:44 (MJD 60068.07065). Only a 3 sigma UL could be obtained at 2.3E-03 cts/s or 9.4E-14 erg/cm2/s (0.3-10 keV).

The UVOT observed the field simultaneously with the XRT in the following UV filters:
MJD+/-MJDerr filter mags+/-mags_e (stat) ±mags_esys (sys)
60068.4149+/-0.3330 W1 18.15+/-0.06 (stat) +/-0.03 (sys)
60068.4094+/-0.3330 M2 18.54+/-0.08 (stat) +/-0.03 (sys)
60068.4037+/-0.3329 W2 18.62+/-0.07 (stat) +/-0.03 (sys)
The magnitudes are not corrected for Galactic extinction.

We warmly thank the PI B. Cenko, the Science Planners, and the Observatory Duty Scientists for having scheduled these observations.