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Swift and Mount Laguna Observatory Photometry of Gaia16buy

ATel #9856; Robert Quimby, Michael Bareian, Nelly Eaves, Anne Hedlund, Ben Kuhn, Melanie Kae Olaes, Sky Phillips, Ryan Rickards Vaught (San Diego State University)
on 13 Dec 2016; 22:22 UT
Credential Certification: Robert Quimby (rquimby@mail.sdsu.edu)

Subjects: Optical, Supernovae

We observed the Type IIn supernova, Gaia16buy, (Kangas et al. ATel #9836) between 2016 Nov 19 and 2016 Dec 10 in the B, V, and R bands with the Mount Laguna Observatory 1m telescope as part of the Astronomy 680 graduate course. The source brightened significantly from the discovery magnitude (g=17.95; Gaia) and reached V=17.06 +/- 0.04 on 2016 Dec 3.11 (UT). The target continued to brighten in the R band, reaching R=16.89 +/- 0.02 on 2016 Dec 10.10 (UT), our last observation. Correcting for Galactic extinction and redshift, this implies an absolute magnitude of M_R = -20.5.

Gaia16buy was observed by Swift on 2016 Dec 7 (UT). Neglecting contamination from the faint (g=20.43) host galaxy, we measure the following preliminary UVOT (Vega) magnitudes:

 
   MJD      FILT     Mag   Mag _err 
57730.3984      V   17.24   0.14 
57730.3917      B   17.78   0.11 
57730.3903      U   16.80   0.07 
57730.3883   UVW1   17.22   0.08 
57730.4009   UVM2   17.43   0.09 
57730.3950   UVW2   17.59   0.06 
We thank the Swift team for scheduling these ToO observations.