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Follow-up photometry of iPTF16geu

ATel #9648; C.-H. Lee
on 19 Oct 2016; 10:20 UT
Credential Certification: Chien-Hsiu Lee (leech@naoj.org)

Subjects: Optical, Supernovae, Gravitational Lensing

We report follow-up photometry of the strongly lensed SNIa iPTF16geu (ATel #9603, #9626). We observed iPTF16geu on 2016/10/17 with the 2.5-m Isaac Newton Telescope (INT) + WFC at La Palma, under ~0.9" seeing condition. Images were taken in Sloan g, r, and i-filters, each with 2x600-sec exposures. After subtracting the foreground lens and the host galaxy using SDSS photometry, we estimate iPTF16geu to be g=22.2, r=20.4 and i=19.7 mag on 2016 Oct. 17.957 UT. We are grateful to the director Dr. Marc Balcells for approving this service program using discretionary time; the service program manager Dr. Javier Mendez for coordinating the observation, and the observers Ovidiu Vaduvescu, F.Galindo, D. Modiano, L. Suarez for executing the program. Based on service observations made with the Isaac Newton Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.