Photometric follow-up of SN2018zd/Gaia18anr from Bialkow
ATel #12079; P. Mikolajczyk (Wroclaw University Astronomical Observatory), L. Wyrzykowski (Warsaw University Astronomical Observatory)
on 4 Oct 2018; 15:21 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@astrouw.edu.pl)
Subjects: Optical, Supernovae, Transient
We report here on the photometric observations of the Type IIn supernova SN 2018zd (otherwise known as
Gaia18anr), discovered by Koichi Itagaki and classified by Zhang et al.
(ATel #11379), with the 60-cm Cassegrain reflector in Astronomical
Observatory of the University of Wroclaw (Bialkow, Poland) over the
period of 3 months (from April 14 2018 to July 15 2018).
Observations took place during twelve photometric nights and data has been collected
in four bands of the Johnson-Cousins photometric system: B, V, Rc and
Ic. I observed substantial and consistent decrease in brightness in all
four photometric bands, till the point where measurements became partly
unreliable due to the limitations of aforementioned telescope. We found
that Gaia measurements in G-band are more or less consistent with Rc band measurements over long period of time. We also found that during two nights: May 13, 2018 and May 19, 2018 a little
increase in brightness may be spotted in all used photometric bands.
Such an effect may be spotted also in the data taken from other nights.
Taking into account the precision of Gaia18anr photometry (especially
during the first month of observations), we suggest it may be a photometric
manifestation of decay processes of radioactive elements.
The follow-up photometric data are shown on Gaia alerts follow-up webpage and can be requested from the author.
We acknowledge the Gaia Photometric Alerts group (http://gsaweb.ast.cam.ac.uk/alerts).
We also acknowledge the use of the Cambridge Photometric Calibration Server (http://gsaweb.ast.cam.ac.uk/followup), developed and maintained by Lukasz Wyrzykowski, Sergey Koposov, Arancha Delgado, Pawel Zielinski, funded by the European Union's Horizon 2020 research and innovation programme under grant agreement No 730890 (OPTICON).
Follow-up observations on Gaia Alerts webpage
