\begin{table}%T1
 \caption{\label{grb050406:tab_obs}Observation log of XRF 050406.}
 %\centerline
{
 \begin{tabular}{cccccc}
 \hline
 \hline
 Sequence         & Obs/Mode     & Start time  (UT)             & End time   (UT)                 & 
Exposure$^{{a}}$ & Time since trigger   \\
                 &              & (yyyy-mm-dd hh:mm:ss)           & (yyyy-mm-dd hh:mm:ss)        &(s)  & (s)       \\
 \hline 
00113872000	&       BAT     &      2005-04-06  15:53:48    &       2005-04-08  06:32:39    &       ...     &      $-$300     \\
00113872000	&	XRT/IM   &      2005-04-06  16:00:12    &       2005-04-06  16:00:14    &       2.5     &       84      \\
00113872000	&	XRT/PuPD &	2005-04-06  16:00:17	&	2005-04-08  00:04:58	&	92	&	90	\\
00113872000	&	XRT/LrPD &	2005-04-06  16:00:18	&	2005-04-08  09:33:32	&	681	&	91	\\
00113872000	&	XRT/WT	&	2005-04-06  16:00:20	&	2005-04-08  09:38:58	&	3728	&	92	\\
00113872000	&	XRT/PC	&	2005-04-06  16:00:26	&	2005-04-08  09:49:03	&	49~939	&	99	\\
00113872001	&	XRT/PC	&	2005-04-08  09:49:39	&	2005-04-08  22:51:57	&	7431	&	150~652	\\
00113872002	&	XRT/PC	&	2005-04-09  00:14:14	&	2005-04-11  23:09:57	&	12~558	&	202~527	\\
00113872005	&	XRT/PC	&	2005-04-12  00:36:42	&	2005-04-12  23:20:12	&	3912	&	463~074	\\
00113872006	&	XRT/PC	&	2005-04-13  00:29:18	&	2005-04-13  23:26:58	&	11~291	&	549~031	\\
00113872008	&	XRT/PC	&	2005-04-16  00:48:33	&	2005-04-18  23:43:57	&	35~937	&	809~386	\\
00113872009	&	XRT/PC	&	2005-04-20  01:13:27	&	2005-04-20  23:59:57	&	17~937	&	1~156~479	\\
00113872010	&	XRT/PC	&	2005-04-21  01:19:44	&	2005-04-21  23:59:58	&	12~546	&	1~243~256	\\
00113872011	&	XRT/PC	&	2005-04-22  00:05:06	&	2005-04-22  22:48:57	&	11~526	&	1~325~178	\\
    \hline
  \end{tabular}}
  \smallskip
 $^{{a}}$ The exposure time is spread over several snapshots (single continuous pointing at the target) 
	during each observation (with the exclusion of~BAT and XRT/IM data).
   \end{table}