Gamma-ray observations under bright moonlight with VERITAS
- Archambault, S.
- Archer, A.
- Ciupik, L.
- Connolly, M. P.
- Cui, W.
- Daniel, M. K.
- Errando, M.
- Falcone, A.
- Feng, Q.
- Finley, J. P.
- Fleischhack, H.
- Fortson, L.
- Benbow, W.
- Furniss, A.
- Gillanders, G. H.
- Griffin, S.
- Hanna, D.
- Hervet, O.
- Holder, J.
- Hughes, G.
- Humensky, T. B.
- Hütten, M.
- Johnson, C. A.
- Bird, R.
- Kaaret, P.
- Kar, P.
- Kertzman, M.
- Kieda, D.
- Krause, M.
- Lang, M. J.
- Lin, T. T. Y.
- Maier, G.
- McArthur, S.
- Moriarty, P.
- Bourbeau, E.
- Mukherjee, R.
- Nieto, D.
- O’Brien, S.
- Ong, R. A.
- Otte, A. N.
- Park, N.
- Pohl, Martin
- Popkow, A.
- Pueschel, E.
- Quinn, J.
- Bouvier, A.
- Ragan, K.
- Reynolds, P. T.
- Richards, G. T.
- Roache, E.
- Rulten, C.
- Sadeh, I.
- Sembroski, G. H.
- Shahinyan, K.
- Staszak, D.
- Telezhinsky, I.
- Buchovecky, M.
- Trepanier, S.
- Wakely, S. P.
- Weinstein, A.
- Wilcox, P.
- Williams, D. A.
- Zitzer, B.
- Bugaev, V.
- Cardenzana, J. V.
- Cerruti, M.
DOIAbstract
Imaging atmospheric Cherenkov telescopes (IACTs) are equipped with sensitive photomultiplier tube (PMT) cameras. Exposure to high levels of background illumination degrades the efficiency of and potentially destroys these photo-detectors over time, so IACTs cannot be operated in the same configuration in the presence of bright moonlight as under dark skies. Since September 2012, observations have been carried out with the VERITAS IACTs under bright moonlight (defined as about three times the night-sky-background (NSB) of a dark extragalactic field, typically occurring when Moon illumination > 35%) in two observing modes, firstly by reducing the voltage applied to the PMTs and, secondly, with the addition of ultra-violet (UV) bandpass filter...
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