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Follow-up Photometry of the Microlensing Event TCP J05074264+2447555

ATel #10926; R. Konyves-Toth, A. Pal, A. Ordasi, J. Vinko (Konkoly Observatory)
on 5 Nov 2017; 01:24 UT
Credential Certification: Jozsef Vinko (vinko@astro.as.utexas.edu)

Subjects: Optical, Transient, Gravitational Lensing

We report photometric observations of TCP J05074264+2447555 (R.A. = 05:08:43, Dec=+24:47:56), a proposed microlensing event at peak magnitude of V~11.5, discovered by T.Kojima UT 2017-10-25.688, and later confirmed by ASAS-SN (ATel #10923)

Our data were taken with the 60/90 cm Schmidt telescope and the 1-meter RCC Telescope through Bessell B,V,R,I filters at Konkoly Observatory, Piszkesteto, Hungary between UT 2017-11-03.9 and 2017-11-04.9.

Photometry was performed with IRAF/daophot by PSF-fitting using local comparison stars for photometric reference. Standardized magnitudes were tied to the PS1 photometry of the comparison stars after transforming the PS1 gri magnitudes to the Johnson-Cousins BVRI system.

We obtained the following magnitudes for TCP J05074264+2447555:

 
# MJD       B     eB    V      eV     R     eR     I    eI    Instrument 
58060.91  12.927 0.112 11.983 0.113 11.469 0.093 10.932 0.044  Schmidt 
58060.99  12.973 0.137 12.054 0.083 11.575 0.086 10.994 0.037  Schmidt 
58061.08  12.984 0.124 12.057 0.061 11.576 0.061 10.988 0.033  Schmidt 
58061.12  12.905 0.116 12.100 0.045 11.549 0.052 10.992 0.060  Schmidt 
58061.90   --     --   12.164 0.026 11.659 0.029 11.125 0.022  1m_RCC 
58061.94  13.057 0.114 12.233 0.063 11.742 0.059 11.160 0.054  Schmidt 

These data confirm the prediction by Jayasinghe et al. (ATel #10923) that the transient has been already passed maximum, and it is currently declining. Our photometry is fully consistent with their predicted microlensing model light curve.