Data sources:

6m: BVRcIc photometry by V.P.Goranskij, E.A.Barsukova and V.F.Valeev made with the BTA/SCORPIO.
A2: Rc measurement by D.Yu.Tsvetkov made with the SAI 70-cm telescope in Moscow and the Apogee AP-7 Camera.
A5: BVRcIc photometry by V.G. Metlov and V.P. Goranskij with the SIA Crimean Station 50-cm Maksutov meniscus telescope with the Apogee Alta U8300 CCD (V=V[A5]+0.04, B=B[A5]+0.04, I=I[A5]+0.06).
AC: A. Cason (unfiltered), http://www.rochesterastronomy.org/sn2015/snhunt275.html
CT: S. Campana, C.C. Thoene, G. Leloudas, F. Aceituno, A. de Ugarte Postigo, ATel No.7517, 2015 (Transferred from the SWIFT/UVOT AB95 to Vega system).
ER: N. Elias-Rosa, S. Benetti, L. Tomasella, E. Cappellaro, P. Ochner, A. Pastorello, L. Tartaglia, G. Terreran, M. Turatto, ATel No.7042, 2015.
FL: Rc photometry by A.V. Zharova with the 60-cm telescope of the SAI Crimean station and FLI PL CCD Camera.
GC: G. Cortini, Flickr.com.
GL: G. Locatelli, Flickr.com.
GM: G. Masi, CBAT.
MM: M. Mizutani, Flickr.com.
IV: BVRcIc photometry by I.M. Volkov with the 1-m telescope of the Simeiz Observatory, Crimea and FLI PL09000 CCD Camera (R=R[IV]+0.08).
IW: BVRcIc photometry by I.M. Volkov with the 60-cm telescope of the Simeiz Observatory, Crimea and VersArray-F512 CCD Camera (R=R[IV]+0.08).
RA: R. Arbour (unfiltered), http://www.rochesterastronomy.org/sn2015/snhunt275.html
SH: S. Howerton (unfiltered), SNhunt, https://www.flickr.com/photos/watchingthesky/17162602585/
SO: BVR photometry by V.P. Goranskij with the SAO Zeiss 1-m reflector and CCD EEV 42-40.
SR Gemini color image by S. Rankin in Flickr.com.
UG: A. de Ugarte Postigo, C.C. Thoene, G. Leloudas, F. Aceituno, ATel No.7514, 2015.
UL: A. de Ugarte Postigo, G. Leloudas, C.C. Thoene, S. Geier, A. Tejero, ATel No.7409, 2015 (Transferred from SDSS gri magnitudes).
VS: J. Vinko, K. Sarneczky, K. Vida, ATel No. 7541, 2015 (V=V[VS]+0.18, R=R[VS]+0.31, I=I[VS]+0.35).