A. Duerr⁴, M. Errando⁸, M. Escobar Godoy⁹, J. Escudero Pedrosa¹⁰, S. Feldman⁶, Q. Feng^4,†, S. Filbert⁴, L. Fortson¹¹, A. Furniss⁹, W. Hanlon⁵, O. Hervet⁹, C. E. Hinrichs¹², J. Holder³, Z. Hughes⁸, T. B. Humensky¹³, M. Iskakova⁸, W. Jin⁶, P. Kaaret¹⁴, M. Kertzman², M. Kherlakian¹⁵, D. Kieda⁴, T. K. Kleiner¹⁶, N. Korzoun³, F. Krennrich¹⁷, S. Kumar¹⁸, S. Kundu¹⁹, M. J. Lang²⁰, M. Lundy²¹, P. Moriarty²⁰, R. Mukherjee²², W. Ning⁶, R. A. Ong⁶, A. Pandey⁴, M. Pohl²³, E. Pueschel¹⁵, J. Quinn²⁴, P. L. Rabinowitz⁸, K. Ragan²¹, P. T. Reynolds²⁵, D. Ribeiro¹¹, E. Roache⁵, C. Rulten^11,26, I. Sadeh¹⁶, L. Saha⁵, M. Santander¹⁹, G. H. Sembroski²⁷, R. Shang²², D. Tak²⁸, A. K. Talluri¹¹, J. V. Tucci²⁹, J. Valverde³⁰, V. V. Vassiliev⁶, D. A. Williams⁹, S. L. Wong²¹, J. Woo³¹, T. Yoshikoshi³², and M. Meyer³³ (VERITAS Collaboration)

• ¹Physics Department, Columbia University, New York, New York 10027, USA
• ²Department of Physics and Astronomy, DePauw University, Greencastle, Indiana 46135-0037, USA
• ³Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, Delaware 19716, USA
• ⁴Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
• ⁵Center for Astrophysics | Harvard & Smithsonian, Cambridge, Massachusetts 02138, USA
• ⁶Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
• ⁷Physics Department, California Polytechnic State University, San Luis Obispo, California 94307, USA
• ⁸Department of Physics, Washington University, St. Louis, Missouri 63130, USA
• ⁹Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, California 95064, USA
• ¹⁰Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
• ¹¹School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
• ¹²Center for Astrophysics | Harvard & Smithsonian, Cambridge, Massachusetts 02138, USA and Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, New Hampshire 03755, USA
• ¹³Department of Physics, University of Maryland, College Park, Maryland, USA and NASA GSFC, Greenbelt, Maryland 20771, USA
• ¹⁴Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, Iowa 52242, USA
• ¹⁵Fakultät für Physik & Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany
• ¹⁶DESY, Platanenallee 6, 15738 Zeuthen, Germany
• ¹⁷Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
• ¹⁸Department of Physics, University of Maryland, College Park, Maryland, USA
• ¹⁹Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
• ²⁰School of Natural Sciences, University of Galway, University Road, Galway, H91 TK33, Ireland
• ²¹Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada
• ²²Department of Physics and Astronomy, Barnard College, Columbia University, New York 10027, USA
• ²³Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam-Golm, Germany and DESY, Platanenallee 6, 15738 Zeuthen, Germany
• ²⁴School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
• ²⁵Department of Physical Sciences, Munster Technological University, Bishopstown, Cork T12 P928, Ireland
• ²⁶Centre for Advanced Instrumentation, Department of Physics, University of Durham, South Road, Durham DH1 3LE, United Kingdom
• ²⁷Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
• ²⁸SNU Astronomy Research Center, Seoul National University, Seoul 08826, Republic of Korea
• ²⁹Department of Physics, Indiana University Indianapolis, Indianapolis, Indiana 46202, USA
• ³⁰Department of Physics, University of Maryland, Baltimore County, Baltimore Maryland 21250, USA and NASA GSFC, Greenbelt, Maryland 20771, USA
• ³¹Columbia Astrophysics Laboratory, Columbia University, New York, New York 10027, USA
• ³²Institute for Cosmic Ray Research, University of Tokyo, 5-1-5, Kashiwa-no-ha, Kashiwa, Chiba 277-8582, Japan
• ³³CP3-Origins, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark

• ^*Contact author: ca2762@columbia.edu
• ^†Contact author: qi.feng@utah.edu