A flare of 6.668 GHz methanol maser in G36.115+0.552
ATel #15680; Yoshihiro Tanabe (Ibaraki University) and Yoshinori Yonekura (Ibaraki University)
on 15 Oct 2022; 01:55 UT
Credential Certification: Yoshinori Yonekura (yoshinori.yonekura@gmail.com)
Subjects: Radio, Variables, Young Stellar Object
We have detected a flux rise in the 6.668 GHz Class II methanol maser toward G36.115+0.552 (R.A. = 18h55m16.8s, Dec. = +03d05'05.4" [J2000]) using Hitachi 32-m radio telescope operated by Ibaraki University. The flux density before MJD ~ 59790 (July 2022) for the velocity components of VLSR = 71.8, 72.9, 73.8, and 74.2 km/s are ~4, ~20, ~2, and ~2 Jy, respectively. The flux density have gradually started rising from ~20 Jy on MJD 59790 to ~40 Jy on MJD = 59848 (26/Sep./2022) at VLSR = 72.9 km/s. After MJD = 59848, the flux density have started rapid rise: The flux density on MJD = 59853 (01/Oct./2022), MJD = 59860 (08/Oct./2022), and MJD = 59865 (13/Oct./2022) are 13, 18, and 21 for the velocity component of VLSR = 71.8 km/s, 50, 85, and 104 for 72.9 km/s, 4, 9, and 13 for 73.8 km/s, and 4, 16, and 35 for 74.2 km/s.
Figures of comparisons among spectra observed in each date and flux variations for each spectral feature can be seen at the iMet (Ibaraki 6.7 GHz class II methanol maser database) website on
http://vlbi.sci.ibaraki.ac.jp/iMet/
