All Figures

$\begin{figure} \par\includegraphics[height=7cm,width=9.3cm,angle=-270,clip]{H4655F1.ps} \end{figure}$ Figure 1: Localizations of GRB 030131: the annulus obtained by the IPN is consistent with the localization given in Mereghetti et al. (2003a) (GCN 1847) and the one derived in this paper (the annulus obtained using SPI ACS and Ulysses is consistent with the one plotted but has a larger width). The cross indicates the position of the OT.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,height=14cm,clip]{H4655F2.ps} \end{figure}$ Figure 2: IBIS/ISGRI light curve of GRB 030131 in various energy bands ( a): 15-50 keV, b): 50-300 keV, c): 15-500 keV). The six data gaps are artifacts caused by satellite telemetry saturation. Four peaks can be identified, after $\sim$ 15, $\sim$ 40, $\sim$ 55, $\sim$ 85 s. The light curve has been corrected to take into account the varying fraction of the exposed instrument area during the satellite slew. Panel d) shows the spectral variation of the GRB with time.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,height=7cm]{H4655F3.ps}\par \end{figure}$ Figure 3: Positions of GRB 030131 in detector coordinates as a function of time. Note the different scales of the two axes.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8cm,clip]{H4655F4.ps}\par \end{figure}$ Figure 4: Time averaged IBIS/ISGRI spectrum of GRB 030131. Data and best fit model are shown.
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In the text

$\begin{figure} \par\includegraphics[height=7cm,width=9.3cm,angle=-270,clip]{H4655F1.ps} \end{figure}$	Figure 1: Localizations of GRB 030131: the annulus obtained by the IPN is consistent with the localization given in Mereghetti et al. (2003a) (GCN 1847) and the one derived in this paper (the annulus obtained using SPI ACS and Ulysses is consistent with the one plotted but has a larger width). The cross indicates the position of the OT.
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$\begin{figure} \par\includegraphics[width=8cm,height=7cm]{H4655F3.ps}\par \end{figure}$	Figure 3: Positions of GRB 030131 in detector coordinates as a function of time. Note the different scales of the two axes.
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$\begin{figure} \par\includegraphics[angle=-90,width=8cm,clip]{H4655F4.ps}\par \end{figure}$	Figure 4: Time averaged IBIS/ISGRI spectrum of GRB 030131. Data and best fit model are shown.
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