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Follow-up Photometry of iPTF14yb

ATel #5929; J. Vinko (U Szeged, UT Austin), J. M. Silverman (UT Austin), D. Pooley (SHSU), T. Szalai (U Szeged), E. L. Robinson, J. C. Wheeler (UT Austin)
on 28 Feb 2014; 04:17 UT
Credential Certification: Jozsef Vinko (vinko@astro.as.utexas.edu)

Subjects: Optical, Transient

We observed the field around the GRB afterglow candidate iPTF14yb (Cenko et al. ATel #5924) with the DIAFI instrument mounted on the 2.7 m Harlan J. Smith Telescope at McDonald Observatory, Texas. A series of CCD frames using Sloan-g and Sloan-r filters were collected on Feb.27 08:25 UT. The transient has been successfully detected on all frames.

Photometry of this source using nearby field stars from SDSS DR10 resulted in the following magnitude estimates: g' = 22.29 +/- 0.08, r' = 22.03 +/- 0.10. These magnitudes are consistent with the nearly contemporaneous photometry by Garnavich & Wiggins (ATel #5927).

Provided the light curve can be fit by a single power-law, the moment of outburst and the power-law index is MJD 56714.416 (Feb 25, 9:59 UT) and -0.79, respectively. These values are in perfect agreement with the ones in ATel #5927.

The DIAFI image and the light curve can be accessed at the following http URL:
http://www.as.utexas.edu/~vinko/ptf14yb_sdss.png
http://www.as.utexas.edu/~vinko/ptf14yb_lc.jpg