\begin{table}
      \caption{Near-infrared follow-up photometry of our $\sigma$ Orionis cluster members and candidates.} 
           \label{nir}
     $$ 
     \small    \begin{tabular}{l c c c c c c c c c}
            \hline
            \hline
            \noalign{\smallskip}
Name			  & $J$ (mag)		  & $H$ (mag) 	  & $K_{\rm s}$ (mag) & $[3.6]$ (mag)	       & $[4.5]$ (mag)         & $[5.8]$ (mag)         & $[8.0]$ (mag)  & Flag$^{a}$	\\  
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
S~Ori J054000.2--025159  & 14.14~$\pm$~0.03	  & 13.47~$\pm$~0.02& 13.15~$\pm$~0.04    & 12.83~$\pm$~0.08         & 12.86~$\pm$~0.10        & 12.63~$\pm$~0.11        & 12.51~$\pm$~0.14 & 2224		\\ % 11142 Ca04, Ke05
S~Ori J053848.1--024401  & 14.07~$\pm$~0.03	  & 13.58~$\pm$~0.03& 13.19~$\pm$~0.03    & 12.51~$\pm$~0.07         & 12.37~$\pm$~0.08        & 11.89~$\pm$~0.08        & 11.08~$\pm$~0.07 & 2224		\\ % 21184 Be04, Ke05
S~Ori J053833.9--024508  & 14.25~$\pm$~0.03	  & 13.68~$\pm$~0.03& 13.35~$\pm$~0.04    & 12.81~$\pm$~0.08         & 12.64~$\pm$~0.09        & 12.33~$\pm$~0.10        & 11.44~$\pm$~0.09 & 2224		\\ % 22241 Be04, Ke05
S~Ori J053911.4--023333  & 14.45~$\pm$~0.03	  & 13.93~$\pm$~0.03& 13.57~$\pm$~0.04    & 13.28~$\pm$~0.10         & 13.10~$\pm$~0.11        & 12.95~$\pm$~0.13        & 13.04~$\pm$~0.19 & 2224		\\ % 33098 Be01, ByN03, Ke05
S~Ori 14		  & 14.38~$\pm$~0.03	  & 13.82~$\pm$~0.03& 13.38~$\pm$~0.03    & 13.02~$\pm$~0.09         & 12.92~$\pm$~0.10        & 12.78~$\pm$~0.12        & 12.83~$\pm$~0.17 & 2224		\\ % 42849 Be99, ByN03, Ke05
S~Ori 11		  & 14.29~$\pm$~0.03	  & 13.72~$\pm$~0.03& 13.36~$\pm$~0.04    & 13.21~$\pm$~0.10         & 13.05~$\pm$~0.11        & 12.92~$\pm$~0.13        & 12.79~$\pm$~0.17 & 2224		\\ % 32653 Be99, Be01, ByN03 (Ha=-10.5+-1.5), Be04
S~Ori J054014.0--023127  & 14.57~$\pm$~0.03	  & 13.98~$\pm$~0.03& 13.57~$\pm$~0.04    & --		       & --		       & --		       & --		& 2220		\\ % 32232 Ca04, Ke05
S~Ori J053847.2--025756  & 14.52~$\pm$~0.03	  & 13.94~$\pm$~0.04& 13.46~$\pm$~0.04    & --		       & 12.62~$\pm$~0.09        & --		       & 11.42~$\pm$~0.08 & 2222		\\ % 21798 Ca04, Ke05
S~Ori J053838.6--024157  & 14.56~$\pm$~0.03	  & 13.96~$\pm$~0.03& 13.65~$\pm$~0.04    & 13.33~$\pm$~0.10         & 13.20~$\pm$~0.10        & 13.25~$\pm$~0.15        & 13.19~$\pm$~0.21 & 2224		\\ % 22097 Be04, Ke05, Ca06
S~Ori 16		  & 14.67~$\pm$~0.03	  & 14.04~$\pm$~0.04& 13.66~$\pm$~0.04    & 13.23~$\pm$~0.10         & 13.55~$\pm$~0.12        & 13.07~$\pm$~0.14        & 13.05~$\pm$~0.20 & 2224		\\ % 41334 Be99, Be01, ByN03, Ca04
S~Ori J053902.1--023501  & 14.44~$\pm$~0.04	  & 13.38~$\pm$~0.03& 12.61~$\pm$~0.03    & 11.45~$\pm$~0.04         & 10.99~$\pm$~0.04        & 10.52~$\pm$~0.04        &  9.75~$\pm$~0.04 & 2224		\\ % 33564 Ca04
S~Ori 25		  & 14.66~$\pm$~0.03	  & 14.14~$\pm$~0.04& 13.74~$\pm$~0.05    & 13.25~$\pm$~0.10         & 13.18~$\pm$~0.11        & 13.22~$\pm$~0.15        & 13.01~$\pm$~0.18 & 2224		\\ % 41080 Be99 (Ha), Be01, ByN03 (Ha), Ca04 (var), Mu03 (Ha, HeI), Ja03, Pa04, Ca04, Fr06 (X)
S~Ori J053954.3--023719  & 14.75~$\pm$~0.03	  & 14.21~$\pm$~0.04& 13.80~$\pm$~0.05    & 13.36~$\pm$~0.10         & 13.30~$\pm$~0.12        & 13.36~$\pm$~0.16        & 13.25~$\pm$~0.20 & 2224		\\ % 34451 Ca04, Ca06 (Ha=-5+-1), [Be04]
S~Ori J053844.4--024037  & 14.80~$\pm$~0.03	  & 14.21~$\pm$~0.04& 13.94~$\pm$~0.05    & 13.45~$\pm$~0.14         & 13.06~$\pm$~0.11        & 12.63~$\pm$~0.11        & 12.29~$\pm$~0.15 & 2224		\\ % 21046 Be04
S~Ori J053826.1--024041  & 14.91~$\pm$~0.04	  & 14.28~$\pm$~0.04& 13.92~$\pm$~0.06    & 13.60~$\pm$~0.12         & 13.44~$\pm$~0.13        & 13.28~$\pm$~0.15        & 13.17~$\pm$~0.20 & 2224		\\ % 23044 ByN03, Ca04, Be04, Ke05, Ca06
S~Ori 20		  & 14.96~$\pm$~0.04	  & 14.34~$\pm$~0.04& 13.90~$\pm$~0.05    & 13.52~$\pm$~0.11         & 13.49~$\pm$~0.13        & 13.24~$\pm$~0.15        & 13.48~$\pm$~0.23 & 2224		\\ % 31269 Be99, Be01, ByN03, SE04, Ke05
S~Ori J053829.0--024847  & 14.82~$\pm$~0.04	  & 14.28~$\pm$~0.04& 13.88~$\pm$~0.06    & 13.16~$\pm$~0.09         & 12.85~$\pm$~0.10        & 12.46~$\pm$~0.10        & 11.82~$\pm$~0.10 & 2224		\\ % 23448 Be01, ByN03 (Ha-), Ca04
S~Ori 27		  & 14.83~$\pm$~0.03	  & 14.31~$\pm$~0.04& 14.09~$\pm$~0.05    & 13.60~$\pm$~0.12         & 13.42~$\pm$~0.13        & 13.54~$\pm$~0.17        & 13.43~$\pm$~0.22 & 2224		\\ % 24047 Be99, Be01, ZO02, ByN03, Go03, Ca04, Be04, [ZO04], Pa05, Ke05, Pa05
S~Ori J053825.4--024241  & 14.88~$\pm$~0.03	  & 14.16~$\pm$~0.04& 13.57~$\pm$~0.03    & 12.72~$\pm$~0.08         & 12.38~$\pm$~0.08        & 11.96~$\pm$~0.08        & 11.26~$\pm$~0.08 & 2224		\\ % 23156 Ca04, Be04, Ca06
S~Ori 28		  & 15.33~$\pm$~0.04	  & 14.78~$\pm$~0.04& 14.34~$\pm$~0.07    & 13.91~$\pm$~0.13         & 13.87~$\pm$~0.16        & 13.80~$\pm$~0.20        & 13.80~$\pm$~0.27 & 2224		\\ % 43752 Be99, Be01, ZO02, ByN03, Ca04, [ZO04], Pa05, Ke05, Pa05
S~Ori 31		  & 15.19~$\pm$~0.04	  & 14.57~$\pm$~0.05& 14.16~$\pm$~0.08    & 13.82~$\pm$~0.13         & 13.63~$\pm$~0.14        & 13.50~$\pm$~0.16        & 13.51~$\pm$~0.24 & 2224		\\ % 23341 Be99, BJ01 (var), Be01, ByN03 (Ha=-2.5+-0.9), [ZO03], [Jo03], Ca04, Be04, Pa04, Pa05
S~Ori J053922.2--024552  & 15.32~$\pm$~0.04	  & 14.84~$\pm$~0.05& 14.41~$\pm$~0.08    & 14.23~$\pm$~0.16         & 13.99~$\pm$~0.16        & 13.94~$\pm$~0.21        & 13.83~$\pm$~0.28 & 2224		\\ % 43396 Ca04
S~Ori 30		  & 15.24~$\pm$~0.04	  & 14.75~$\pm$~0.04& 14.31~$\pm$~0.07    & 13.77~$\pm$~0.12         & 13.59~$\pm$~0.14        & 13.22~$\pm$~0.15        & 12.54~$\pm$~0.14 & 2224		\\ % 34576 Be99, Be01, ByN03 (Ha=-16+-6), Ca04  	 
S~Ori 32		  & 15.34~$\pm$~0.05	  & 14.78~$\pm$~0.06& 14.37~$\pm$~0.08    & 13.90~$\pm$~0.13         & 13.86~$\pm$~0.16        & 13.65~$\pm$~0.18        & 13.85~$\pm$~0.19 & 2224		\\ % 44072 Be99, Be01, ByN03, Ca04, Be04, Ke05
S~Ori J053855.4--024121  & 15.62~$\pm$~0.10	  & 14.84~$\pm$~0.05& 13.97~$\pm$~0.06    & 12.88~$\pm$~0.08         & 12.52~$\pm$~0.08        & 12.08~$\pm$~0.09        & 11.15~$\pm$~0.08 & 2224		\\ % 41521 ---
S~Ori J054004.5--023642  & 15.30~$\pm$~0.05	  & 14.81~$\pm$~0.05& 14.27~$\pm$~0.07    & 13.67~$\pm$~0.12         & 13.37~$\pm$~0.12        & 12.89~$\pm$~0.12        & 12.14~$\pm$~0.12 & 2224		\\ % 34252 Ca04, Be04, Ke05
S~Ori 36		  & 15.46~$\pm$~0.04	  & 14.84~$\pm$~0.05& 14.49~$\pm$~0.06    & 13.71~$\pm$~0.12         & 13.48~$\pm$~0.13        & 13.04~$\pm$~0.13        & 12.36~$\pm$~0.14 & 2224		\\ % 34332 Be99, Be01, ByN03, Ca04, Ke05
S~Ori J053854.9--024034  & 15.92~$\pm$~0.06	  & 15.17~$\pm$~0.06& 14.71~$\pm$~0.11    & 13.79~$\pm$~0.13         & 13.42~$\pm$~0.13        & 12.91~$\pm$~0.13        & 12.47~$\pm$~0.14 & 2224		\\ % 41267 ---
S~Ori J053918.1--025257  & 16.15~$\pm$~0.08	  & 15.55~$\pm$~0.10& 15.14~$\pm$~0.13    & 14.47~$\pm$~0.17         & 14.20~$\pm$~0.18        & 13.86~$\pm$~0.20        & 13.14~$\pm$~0.20 & 2224		\\ % 11387 Ca04
S~Ori 42		  & 16.72~$\pm$~0.13	  & 15.92~$\pm$~0.13& 15.55~$\pm$~0.21    & 14.87~$\pm$~0.21         & 14.41~$\pm$~0.20        & 14.15~$\pm$~0.23        & 13.22~$\pm$~0.20 & 2224		\\ % 41389 Be99, ByN03, Ca04
S~Ori 45		  & 16.67~$\pm$~0.11	  & 16.02~$\pm$~0.13& 15.59~$\pm$~0.21    & 14.75~$\pm$~0.37         & 14.76~$\pm$~0.23        & 14.82~$\pm$~0.33        & $\gtrsim$14.8	& 2224		\\ % 23438 Be99, AMB00, BJ01, Be01, ZO02, ByN03, Mu03, ZO03, Ca04, [ZO04], [Pa05], [Pa05], [Mc05], [ByN05] -- H&Ks: 16.02~$\pm$~0.13& 15.59~$\pm$~0.21
S~Ori J053929.4--024636  & 16.96~$\pm$~0.16	  & 16.52~$\pm$~0.11& 16.03~$\pm$~0.07    & 15.17~$\pm$~0.24         & 15.18~$\pm$~0.28        & 15.38~$\pm$~0.49        & $\gtrsim$14.8	& 1114		\\ % 43639 Ca04
S~Ori 51		  & 17.06~$\pm$~0.12	  & 16.42~$\pm$~0.09& 16.13~$\pm$~0.10    & 15.44~$\pm$~0.27         & 15.31~$\pm$~0.30        & 15.16~$\pm$~0.41        & $\gtrsim$14.8	& 1114		\\ % 31624 ZO00, Be01, MS02, McG04, Ca04 
S~Ori 71		  & 17.23~$\pm$~0.07	  & 16.52~$\pm$~0.11& 16.11~$\pm$~0.05    & 15.36~$\pm$~0.26         & 14.93~$\pm$~0.25        & 14.62~$\pm$~0.30        & 13.51~$\pm$~0.24 & 1114		\\ % 34380 ByN02, Liebert03, ByN03, Luhman03, ZO03, LM04, Ca04, ByN05, Lu05, Koen05, Ki05 
S~Ori J053849.5--024934  & 17.30~$\pm$~0.08	  & 16.70~$\pm$~0.05& 16.20~$\pm$~0.07    & 15.38~$\pm$~0.26         & 15.20~$\pm$~0.29        & 14.43~$\pm$~0.26        & 13.97~$\pm$~0.30 & 1114		\\ % 21426 Ca04
S~Ori 47		  & 17.53~$\pm$~0.24	  & 16.22~$\pm$~0.17& 15.81~$\pm$~0.08    & 14.94~$\pm$~0.21         & 14.96~$\pm$~0.26        & 14.75~$\pm$~0.30        & $\gtrsim$14.8	& 2234		\\ % 24042 Be99, ZO99, Basri00, ZO00, Ma01, Lu01, ByN01, ZO02, Foot02, ByN02, ZO02, ByN03, Jo03, McG04, Ca04, MH05, Koen05, Ki05
S~Ori 50		  & 17.50~$\pm$~0.07	  & 17.12~$\pm$~0.14& 16.18~$\pm$~0.05    & 15.60~$\pm$~0.29         & 15.71~$\pm$~0.36        & 15.07~$\pm$~0.40        & $\gtrsim$14.8	& 1114		\\ % 34433 ZO00, Be01, ByN01, Ca04
S~Ori 53		  & 17.92~$\pm$~0.06	  & 17.36~$\pm$~0.05& 16.76~$\pm$~0.07    & 15.94~$\pm$~0.34         & 15.96~$\pm$~0.41        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1114		\\ % 23417 ZO00, Be01, ByN01, Ca04
S~Ori J053944.5--025959  & 18.04~$\pm$~0.08	  & 17.14~$\pm$~0.32& 16.98~$\pm$~0.12    & --		       & 16.61~$\pm$~0.20        & --		       & $\gtrsim$14.8	& 1102		\\ % 14218 Ca04, Beinprep
S~Ori J054007.0--023604  & 18.22~$\pm$~0.07	  & 17.49~$\pm$~0.16& 16.88~$\pm$~0.12    & 16.07~$\pm$~0.20         & 16.10~$\pm$~0.20        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1104		\\ % 34081 Ca04, Beinprep
S~Ori J053956.8--025315  & 18.27~$\pm$~0.08	  & 17.66~$\pm$~0.05& 17.18~$\pm$~0.07    & 16.55~$\pm$~0.20         & 16.47~$\pm$~0.20        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1114		\\ % 11467 Ca04
S~Ori J053858.6--025228  & 18.61~$\pm$~0.08	  & 18.04~$\pm$~0.06& 17.29~$\pm$~0.07    & 16.29~$\pm$~0.20         & 15.96~$\pm$~0.20        & 15.88~$\pm$~0.60        & $\gtrsim$14.8	& 1114		\\ % 11253 Ca04
S~Ori J053949.5--023130  & 18.89~$\pm$~0.10	  & 18.18~$\pm$~0.09& 17.42~$\pm$~0.20    & 16.57~$\pm$~0.30         & 16.62~$\pm$~0.20        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1114		\\ % 32240 C, sok
S~Ori 60		  & 19.05~$\pm$~0.10	  & 18.00~$\pm$~0.50& 17.30~$\pm$~0.10    & 16.52~$\pm$~0.45         & 15.52~$\pm$~0.41        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1134		\\ % 32003 ZO00, Be01, Ma01, Lucas01, ByN01
S~Ori 62		  & 19.18~$\pm$~0.10	  & 18.00~$\pm$~0.50& 17.86~$\pm$~0.10    & 16.99~$\pm$~0.34         & 16.83~$\pm$~0.48        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1134		\\ % 31669 ZO00, Be01, Ma01, ByN01
S~Ori J053844.5--025512  & 19.31~$\pm$~0.08	  & 18.40~$\pm$~0.30& 17.99~$\pm$~0.07    & 16.82~$\pm$~0.51         & 16.79~$\pm$~0.54        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1114		\\ % 21672 Ca04, GG06
S~Ori J054008.5--024551  & 19.43~$\pm$~0.16	  & --  	  & --  	      & --		       & --		       & --		       & --		& 1000		\\ % 43377 Ca04, GG06
S~Ori J053932.4--025220  & 19.54~$\pm$~0.08	  & 18.70~$\pm$~0.06& 17.86~$\pm$~0.07    & 16.12~$\pm$~0.37         & 16.23~$\pm$~0.46        & $\gtrsim$15.8	       & $\gtrsim$14.8	& 1114		\\ % 11231 Ca04, GG06
S~Ori J054011.6--025135  & 19.69~$\pm$~0.09	  & --  	  & --  	      & --		       & --		       & --		       & --		& 1000		\\ % 11047
\noalign{\smallskip}
            \hline
         \end{tabular}
     $$ 
\begin{list}{}{}
\item[$^{a}$] Source of the infrared photometry.
Three first digits ($JHK_{\rm s}$): 
0 -- not available;
1 -- this work;
2 -- 2MASS;
3 -- Mart\'{\i}n et~al. (2001).
Fourth digit (IRAC passbands):
0 -- object in any IRAC channel area;
2 -- object in two IRAC channel areas;
4 -- object in four IRAC channel areas.
\end{list}
   \end{table}