Optical and near-infrared observations of PG1553+113
ATel #15944; Elina Lindfors (Finnish Centre for Astronomy with ESO (FINCA), University of Turku), Talvikki Hovatta (FINCA), Filippo D'Ammando (INAF - Istituto di Radioastronomia), Emilio Molinari (INAF Osservatorio Astronomico di Cagliari), Dino Fugazza (INAF Brera), Pouya M. Kouch (FINCA), Vandad Fallah Ramazani (Ruhr-Universität Bochum, Fakultat fur Physik und Astronomie, Astronomisches Institut), Preeti Kharb (National Centre for Radio Astrophysics - Tata institute of Fundamental Research), Heidi Korhonen (ESO)
on 14 Mar 2023; 20:01 UT
Credential Certification: Elina Lindfors (elilin@utu.fi)
Subjects: Infra-Red, Optical, AGN, Blazar
Referred to by ATel #: 16882
We have performed optical and near-infrared observations of the BL Lac object PG1553+113 following the strong activity observed in optical and radio bands (ATel #15915). The observations were performed between March 08 and 12 with the Rapid Eye Mount (REM) telescope at La Silla, Chile and Joan Oro Telescope (TJO) at Montsec Astronomical Observatory, Spain. Standard differential photometry was performed using a semi-automatic pipeline developed for the Tuorla blazar monitoring program (Nilsson, Lindfors et al. 2018). The brightness was estimated against 2MASS (H-band) and PANSTARS (g,r,i,z-bands) magnitudes of two nearby stars (marked 1 and 3 in the finding chart available here: https://users.utu.fi/kani/1m/finding_charts/PG1553+113_map.html). R-band magnitudes of the comparison and control stars are from Raiteri et al. 2015.
MJD 60007.04 (TJO)
R=13.16+.0.01
MJD 60011.32 (REM)
g=14.05+-0.02
r=13.94+-0.02
i=13.55+-0.02
H=11.22+-0.03
MJD 60014.20 (REM)
g=14.08+-0.06
r=13.88+-0.04
i=13.40+-0.03
z=13.03+-0.09
H=11.19+-0.08
MJD 60015.29 (REM)
g=14.01+0.02
r=13.97+-0.02
i=13.53+-0.05
z=13.13+-0.05
H=11.23+-0.03
MJD 60016.14 (TJO)
R=13.23+-0.01
The current brightness is close to the historical maximum measured from the source in optical and near-IR bands. We will keep monitoring the source with TJO and will update the R-band magnitudes to our webpages: https://users.utu.fi/kani/1m/PG_1553+113.html
