Badary RT32 radio follow-up B2 1420+32

ATel #13479; M. A. Kharinov (Institute of Applied Astronomy of the Russian Academy of Sciences, IAA RAS)
on 14 Feb 2020; 06:30 UT
Credential Certification: Mikhail Kharinov (kharinov@iaaras.ru)

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Following the strong flare of blazar B2 1420+32 starting from 2019 December 31 in high-energy gamma-rays (ATel #13382, #13412, #13417), we have conducted our radio observations with the 32-m radio telescope of the IAA RAS Badary Radio Astronomical Observatory (http://iaaras.ru/en/dept/badary/). Observations were carried out at the 8.63 GHz central frequency with 900 MHz bandwidth on 2020 February 1, 4 and 8. For flux calibration was used 3C147, 3C295, 3C309.1 and NGC7027. The Badary RT-32 detected the source on 9-20 m intervals with the following radio flux densities:

# Date UT 3.5 cm
# yyyy-mm-dd hh:mm S +/-dS mJy
1 2020-02-01 20:40 886 47
2 2020-02-01 21:25 915 34
3 2020-02-01 22:15 783 59
4 2020-02-01 23:05 757 51
5 2020-02-04 18:04 824 51
6 2020-02-04 18:54 794 35
7 2020-02-08 21:25 830 57
8 2020-02-08 22:15 865 52
9 2020-02-08 23:05 847 48


These fluxes are higher in 1.5-1.8 times than can be found in NED archive data from VLA observations on 2007. Our observations indicate an B2 1420+32 high flux state in the radio band. Visible variations of the flux density during February 1 could suggest a presence of intraday variability of radio flux densities in B2 1420+32 on active state.