Using $5.4$ year Fermi-LAT data, we report the detection of GeV $\gamma$-ray emission from the shell-type supernova remnant RCW 86 (G315.4-2.3) with a significance of $\sim5.1\sigma$. The data slightly favors an extended emission of this supernova remnant. The spectral index of RCW 86 is found to be very hard, $\Gamma\sim1.4$, in the $0.4$ to $300$ GeV range. A one zone leptonic model can well fit the multi-wavelength data from radio to very high energy $\gamma$-rays. The very hard GeV $\gamma$-ray spectrum and the inferred low gas density seem to disfavor the hadronic origin of the $\gamma$-rays. The $\gamma$-ray behavior of RCW 86 is very similar to several other TeV shell-type supernova remnants, e.g., RX J1713.7-3946, RX J0852.0-4622, SN 1006 and HESS J1731-347.
S. B. Cenko, D. A. Frail, Fiona Harrison, J. B. Haislip, D. Reichart, N. Butler, B. E. Cobb, A. Cucchiara, E. Berger, J. S. Bloom, P. Chandra, D. B. Fox, D. A. Perley, J. X. Prochaska, Alexei V Filippenko, Karl Glazebrook, K. Ivarsen, M. M. Kasliwal, S. R. Kulkarni, A. Lacluyzé, Sebastián López, A. N. Morgan, Max Pettini, Vikram Rana
S. B. Cenko, D. A. Frail, F. A. Harrison, J. B. Haislip, D. Reichart, N. R. Butler, B. E. Cobb, A. Cucchiara, E. Berger, J. S. Bloom, P. Chandra, D. B. Fox, D. A. Perley, J. X. Prochaska, Alexei V Filippenko, Karl Glazebrook, K. Ivarsen, M. M. Kasliwal, S. R. Kulkarni, A. Lacluyzé, S. Lopez, A. N. Morgan, M. Pettini,
Eli Michael, Richard McCray, Roger A. Chevalier, Alexei V Filippenko, Peter Lundqvist, P. Challis, Ben Sugerman, Stephen S. Lawrence, C. S. J. Pun, P. Garnavich, R. Kirshner, Arlin Crotts, Claes Fransson, Weidong Li, N. Panagia, M. M. Phillips, B. Schmidt, G. Sonneborn, N. B. Suntzeff, Lifan Wang, J. C. Wheeler
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