Swift follow-up observations of the flat spectrum radio quasar PMN J0206-1150 in the error region of IceCube-201130A
ATel #14244; T. Gregoire (PSU), F. D'Ammando (INAF-IRA Bologna), D. B. Fox (PSU), A. Keivani (Columbia U.), J. P. Osborne (U. Leicester), F. Krauss (PSU), P. A. Evans (U. Leicester), J. A. Kennea (PSU), H. A. Ayala Solares (PSU), D. F. Cowen (PSU) and J. DeLaunay (PSU)
on 4 Dec 2020; 19:34 UT
Credential Certification: Filippo D'Ammando (dammando@ira.inaf.it)
Subjects: Optical, Ultra-Violet, X-ray, AGN, Black Hole, Blazar, Quasar
We report on continuing Swift observations of the flat spectrum radio quasar PMN J0206-1150, associated with the gamma-ray source 4FGL J0206.4-1151 (Abdollahi et al. 2020, ApJS, 247, 33), the Fermi-LAT source closest to the location of IceCube 201130A (IceCube Collaboration; GCN Circ. 28969). After the first Swift observation performed on 2020 December 1 (ATel #14240, GCN Circ. 28979), the
source has been observed again by Swift between 20:39 UT on 2020 December 2 and 11:24 UT on 2020 December 3 for a total of 3.9 ks.
The source has been detected by XRT with a net count rate of (2.2 +/- 0.9)e-3 cps. As a comparison, the net count rate of the source on December 1 was (3.1 +/- 0.9)e-3 cps, showing a mild decrease of the source activity in X-rays.
Assuming a photon index of 1.7, as observed on December 1, and fitting the X-ray spectrum with an absorbed power law model with a HI column density consistent with the Galactic value in the direction of the source (n_H = 1.7 x 10^20 cm^-2, Ben Bekhti N. et al., 2016, A&A, 594, A116), we obtain a 0.3-10 keV flux (unabsorbed) of 4.1 (+2.4,-2.0) x10^-14 erg cm^-2 s^-1.
Simultaneous UVOT observations were performed on 2020 December 2-3 and the source is detected above 3 sigma in all UVOT filters, except for the V filter. The measured magnitudes (Vega system) are V > 19.46, B = 19.60 +/- 0.18, U = 18.72 +/- 0.16, W1 = 18.93 +/- 0.15, M2 = 19.17 +/- 0.10, and W2 = 19.21 +/- 0.12. Differently from the X-ray band, a moderate brightening has been observed from U to M2 filters on December 2-3 with respect to December 1.
In ATel #14240 [and GCN Circ. 28979] we wrongly reported that the X-ray source detected by XRT was 2.8 arcmin from the position of PMN J0206-1150, while it should be 2.8 arcsec.
