\begin{table}%t1
\caption{\label{tab:log} \swift\ observation log of \igr.\ } 
%\centerline
 {\small 
\begin{tabular}{@{}lllllllllll@{}}
\hline\hline\noalign{\smallskip}
OBS~ID & Instr. & Start time & Stop time & Exp$^a$ & $N_{\rm H}$ & $\Gamma$ & $kT_{\rm BB}$ & $R_{\rm BB}$$^b$ & $F_{\rm obs}^{c}$ & $\chi^2_{\rm red}$/d.o.f. \\
& & & &  (s) &  (10$^{22}$~cm$^{-2}$) &  & keV & km & (erg/cm$^{2}$/s) & (C-stat/d.o.f.) \\
\hline\noalign{\smallskip}
00031492001 & XRT/WT & 2009-09-13 19:52:24 & 2009-09-14 00:53:31 & 2.2E+03 & 0.6$\pm$0.1 & $\rm 1.3^{+0.2}_{-0.3}$ & $1.0 \pm 0.1$ & $4.6 \pm 0.8$ & $\rm 4.9^{+0.1}_{-0.4}$ & 1.2/447  \\
& XRT/PC & 2009-09-13 21:29:48 & 2009-09-14 01:00:49 & 1.5E+03 & $1.0 \pm 0.2$ & $1.5 \pm 0.1$ & -- & -- & $4.8 \pm 0.3$ & 0.9/81 \\
00031492002 & XRT/WT (1) & 2009-09-14 13:45:33 & 2009-09-14 13:49:50 & 2.5E+02 & 0.9$\pm$0.2 & $1.5 \pm 0.1$ & -- & -- & 4.8$\pm$0.3 & 1.2/74\\
& XRT/WT (2) & 2009-09-14 15:26:34 & 2009-09-14 15:29:01 & 1.5E+02 & $\rm 0.4^{+0.3}_{-0.2}$ & $1.0 \pm 0.3$ & -- &  -- & $4.5 \pm 0.8$ & 1.0/19\\
& XRT/PC & 2009-09-14 13:49:45 & 2009-09-14 15:37:21 & 1.6E+03 & $1.0 \pm 0.2$ & $1.5 \pm 0.2$ & -- &-- & $4.5 \pm 0.5$ & 1.2/50 \\
00031492003 & XRT/WT (1) & 2009-09-15 15:31:43 & 2009-09-15 15:41:25 & 5.8E+02 & $0.4 \pm 0.2$ & $\rm 0.9^{+0.5}_{-1.4}$ & $0.9 \pm 0.1$ & $\rm 6.0^{+1.4}_{-1.8}$ & $\rm 4.8^{+0.1}_{-2.3}$ & 1.1/174  \\
& XRT/WT (2) & 2009-09-15 17:12:27 & 2009-09-15 17:26:00 & 6.1E+02 & $\rm 0.4^{+0.2}_{-0.1}$ & $\rm 0.8^{+0.6}_{-1.5}$ & $0.9 \pm 0.1$ & $\rm 6.3^{+0.9}_{-1.5}$ & $\rm 4.8^{+0.1}_{-2.1}$ & 1.2/183  \\
& XRT/PC & 2009-09-15 15:41:27 & 2009-09-15 15:49:56 & 5.0E+02 & $0.5 \pm 0.3$ & $1.2 \pm 0.2$ & -- &-- & $\rm 5.0^{+0.4}_{-0.6}$ & 0.9/36 \\
00031492004 & XRT/WT (1) & 2009-09-16 17:16:29 & 2009-09-16 17:26:54 & 6.2E+02 & $0.3 \pm 0.2$ & $\rm 0.5^{+0.7}_{-2.2}$ & $0.9 \pm 0.1$ & $\rm 5.5^{+0.8}_{-1.8}$  & $\rm 4.5^{+0.1}_{-2.2}$ & 1.1/170 \\
& XRT/WT (2) & 2009-09-16 18:57:28 & 2009-09-16 19:12:00 & 8.7E+02 & $0.7 \pm 0.2$ & $1.6 \pm 0.4$ & $1.0 \pm 0.2$ & $3.9^{+1.0}_{-0.9}$  & $\rm 4.0^{+0.2}_{-0.6}$ & 1.0/221 \\
& XRT/PC & 2009-09-16 17:26:57 & 2009-09-16 17:34:28 & 4.2E+02 & $\rm 0.9^{+0.4}_{-0.3}$ & $1.5 \pm 0.3$ & -- &-- & $4.2^{+0.2}_{-0.6}$ & 1.2/32\\
00031492005 & XRT/WT (1) & 2009-09-18 20:21:26 & 2009-09-18 20:24:14 & 1.7E+02 & $0.9 \pm 0.2$ & $1.4\pm0.2$ & -- & --  & $4.8 \pm 0.4$ & 0.9/48 \\
& XRT/WT (2) & 2009-09-18 23:34:25 & 2009-09-18 23:39:20 & 3.0E+02 & $\rm 0.9^{+0.2}_{-0.1}$ & 1.5$\pm$0.1 & --  & -- & $4.6 \pm 0.3$ & 0.8/81 \\
& XRT/PC & 2009-09-18 20:24:16 & 2009-09-18 23:43:57 & 1.1E+03 & $1.0 \pm 0.2$ & $1.6 \pm 0.2$ & -- & -- & $\rm 3.9^{+0.2}_{-0.3}$ & 1.1/67 \\
00031492006 & XRT/WT & 2009-09-19 20:27:26 & 2009-09-19 22:25:50 & 1.4E+03 & $0.6 \pm 0.2$ & $\rm 1.2^{+0.3}_{-0.5}$ & $0.9 \pm 0.1$ & $\rm 4.6^{+1.4}_{-1.3}$ & $\rm 4.0^{+0.1}_{-1.4}$ & 1.0/296 \\
& XRT/PC & 2009-09-19 20:27:38 & 2009-09-19 22:26:57 & 3.0E+02 & $\rm 0.6^{+0.5}_{-0.4}$ & $\rm 1.2^{+0.4}_{-0.3}$ & -- & -- & $\rm 4.6^{+0.4}_{-1.0}$ & 0.9/17 \\
00031492007 & XRT/WT (1) & 2009-09-20 09:18:13 & 2009-09-20 09:25:39 & 4.5E+02 & $\rm 0.8^{+0.6}_{-0.3}$ & $\rm 1.9^{+2.5}_{-0.8}$ & $1.1 \pm 0.2$ & $\rm 3.6^{+1.4}_{-0.8}$  & $\rm 3.6^{+0.4}_{-1.7}$ & 0.9/110 \\
& XRT/WT (2) & 2009-09-20 10:58:54 & 2009-09-20 11:01:28 & 1.5E+02 & $\rm 0.9^{+0.3}_{-0.2}$ & 1.5$\pm$0.2 & --  & -- & $\rm 4.0^{+0.3}_{-0.6}$ & 1.2/38 \\
& XRT/PC & 2009-09-20 09:25:42 & 2009-09-20 11:07:55 & 6.8E+02 & 0.9$\pm$0.2 & $1.5 \pm 0.2$ & -- & -- & $\rm 3.6^{+0.2}_{-0.4}$ & 1.1/47 \\
00031492008 & XRT/WT (1) & 2009-09-20 20:31:54 & 2009-09-20 20:34:14 & 2.0E+02 & 0.9$\pm$0.2 & 1.6$\pm$0.2 & -- & -- & $3.6 \pm 0.3$ & 1.2/49 \\
& XRT/WT (2) & 2009-09-20 22:08:54 & 2009-09-20 22:09:27 & 3.2E+01 & $\rm 1.0^{+0.5}_{-0.4}$ & $1.9 \pm 0.5$ & --  & -- & $\rm 3.3^{+0.5}_{-1.3}$ & (23.0/29) \\
& XRT/PC & 2009-09-20 20:35:18 & 2009-09-20 22:14:57 & 5.2E+02 & $\rm 1.1^{+0.4}_{-0.3}$ & $1.5 \pm 0.3$ & -- & -- & $3.5^{+0.3}_{-0.6}$ & 1.1/34 \\
00031492009 & XRT/WT (1) & 2009-09-21 06:10:54 & 2009-09-21 06:16:49 & 3.6E+02 & $0.9 \pm 0.2$ & 1.6$\pm$0.2 & -- & -- & $3.7 \pm 0.2$ & 1.3/87 \\
& XRT/WT (2) & 2009-09-21 07:46:53 & 2009-09-21 07:52:37 & 3.4E+02 & $1.0 \pm 0.2$ & $1.7 \pm 0.2$ & --  & -- & $3.5 \pm 0.2$ & 1.1/80 \\
& XRT/WT (3) & 2009-09-21 09:23:06 & 2009-09-21 11:04:42 & 3.9E+02 & $0.8 \pm 0.2$ & 1.4$\pm$0.1 & --  &-- & $3.9 \pm 0.2$ & 1.1/93 \\
& XRT/PC & 2009-09-21 06:16:50 & 2009-09-21 11:40:02 & 2.9E+03 & 1.1$\pm$0.2 & $1.7 \pm 0.1$ &-- &-- & $3.2 \pm 0.2$ & 0.9/113 \\
00031492010 & XRT/WT & 2009-09-28 10:16:53 & 2009-09-28 19:42:14 & 2.0E+02 & $1.1 \pm 0.3$ & 1.8$\pm$0.3 & -- & -- & $2.3 \pm 0.3$ & 1.1/31 \\
& XRT/PC & 2009-09-28 10:17:20 & 2009-09-28 19:50:57 & 4.6E+03 & $1.0 \pm 0.2$ & $1.5 \pm 0.1$ & -- & -- & $\rm 2.4^{+0.2}_{-0.1}$ & 0.9/101 \\
00031492011 & XRT/PC & 2009-09-30 18:23:35 & 2009-09-30 23:37:56 & 5.1E+03 & $1.1 \pm 0.1$ & 1.7$\pm$0.1 & -- & -- & 2.0$\pm$0.1 & 1.2/204 \\
00371210000 & XRT/PC & 2009-09-30 18:35:26 & 2009-09-30 18:57:18 & 1.3E+03 & $1.1 \pm 0.2$ & 1.7$\pm$0.2 & -- & -- & $2.2 \pm 0.1$ & 0.9/70 \\
\hline
\end{tabular}}
\smallskip
 a: the total exposure time of each observation; {b}: calculated 
by assuming a distance of 10~kpc; {c}: the (absorbed) flux in the 0.5--10~keV energy band in units of 10$^{-10}$.
%\vspace*{-2.5mm}
\end{table}