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Discovery and classification of DLT17bx/AT 2017fgc with PROMPT and FLOYDS as a young type Ia supernova

ATel #10569; D. J. Sand (TTU), S. Valenti (UC Davis), L. Tartaglia (TTU/UC Davis), D. E. Reichart, J. B. Haislip, V. Kouprianov (UNC)
on 11 Jul 2017; 16:23 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: David Sand (dave.j.sand@gmail.com)

Subjects: Optical, Supernovae

We report the discovery and the classification of DLT17bx/AT 2017fgc, which is located at -- RA: 01:20:14.432 Dec: +03:24:09.90. The object was discovered on 2017 July 11.3 UT at R~16.1 mag, during the ongoing D<40 Mpc (DLT40) one day cadence supernova search, using data from the PROMPT 5 0.41m telescope located at CTIO. We also detect the transient on 2017 July 9.3 UT (R~17.3 mag) at low signal-to-noise and on 2017 July 10.4 UT (R~16.5 mag). All images were taken in a 'Clear' filter which was calibrated to an approximate R-band magnitude using the USNO-B1 catalog. We obtained a spectrum of DLT17bx/AT 2017fgc on 2017 July 11.5 UT with the robotic FLOYDS instrument mounted on the Las Cumbres Observatory 2-meter telescope in Haleakala, Hawaii. Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find a good fit to the normal Type Ia SN 2002bo at 13 days before maximum light.