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Acciari, VA,Aliu, E,Arlen, T,Bautista, M,Beilicke, M,Benbow, W,Bottcher, M,Bradbury, SM,Bugaev, V,Butt, Y,Butt, Y,Byrum, K,Cannon, A,Cesarini, A,Chow, YC,Ciupik, L,Cogan, P,Colin, P,Cui, W,Daniel, M,Dickherber, R,Ergin, T,Falcone, A,Fegan, SJ,Finley, JP,Fortin, P,Fortson, L,Furniss, A,Gall, D,Gillanders, GH,Grube, J,Guenette, R,Gyuk, G,Hanna, D,Hays, E,Holder, J,Horan, D,Hui, CM,Humensky, TB,Kaaret, P,Karlsson, N,Kieda, D,Kildea, J,Konopelko, A,Krawczynski, H,Krennrich, F,Lang, MJ,LeBohec, S,Maier, G,McCann, A,McCutcheon, M,Millis, J,Moriarty, P,Mukherjee, R,Nagai, T,Ong, RA,Otte, AN,Pandel, D,Perkins, JS,Perkins, JS,Pohl, M,Quinn, J,Ragan, K,Reyes, LC,Reynolds, PT,Roache, E,Rose, HJ,Schroedter, M,Sembroski, GH,Smith, AW,Steele, D,Stroh, M,Swordy, S,Theiling, M,Toner, JA,Varlotta, A,Vassi
2009
August
Astrophysical Journal
MULTIWAVELENGTH OBSERVATIONS OF LS I+61 degrees 303 WITH VERITAS, SWIFT, AND RXTE
Published
()
Optional Fields
binaries: general gamma rays: observations X-rays: binaries X-RAY BINARY ENERGY GAMMA-RAYS MICROQUASAR LS-I+61-303 TIMING-EXPLORER RADIO TELESCOPE SPECTRUM LSI+61-DEGREES-303 +61-DEGREES-303 LS-I-+61-303
700
1034
1041
We present results from a long-term monitoring campaign on the TeV binary LSI +61 degrees 303 with VERITAS at energies above 500 GeV, and in the 2-10 keV hard X-ray bands with RXTE and Swift, sampling nine 26.5 day orbital cycles between 2006 September and 2008 February. The binary was observed by VERITAS to be variable, with all integrated observations resulting in a detection at the 8.8 sigma (2006/2007) and 7.3 sigma (2007/2008) significance level for emission above 500 GeV. The source was detected during active periods with flux values ranging from 5% to 20% of the Crab Nebula, varying over the course of a single orbital cycle. Additionally, the observations conducted in the 2007-2008 observing season show marginal evidence (at the 3.6 sigma significance level) for TeV emission outside the apastron passage of the compact object around the Be star. Contemporaneous hard X-ray observations with RXTE and Swift show large variability with flux values typically varying between 0.5 and 3.0 x 10(-11) erg cm(-2) s(-1) over a single orbital cycle. The contemporaneous X-ray and TeV data are examined and it is shown that the TeV sampling is not dense enough to detect a correlation between the two bands.
DOI 10.1088/0004-637X/700/2/1034
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