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diff --git a/scripts/ciao_img_rotcrop.sh b/scripts/ciao_img_rotcrop.sh
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+#!/bin/sh
+#
+# Rotate the FITS image to be upright using 'dmregrid2',
+# and crop the outside blank areas of the rotated image
+# according to the CCD sizes.
+#
+# NOTE:
+# * rotation angle is obtained from "ROLL_PNT" keyword
+# * rotation center is the central point of the input image
+#   (in _image_ coordinate and in pixel unit)
+# * cropped image size is set to '1204x1204' for ACIS-S, and
+#   '2066x2066' for ACIS-I
+#
+#
+# Aaron LI
+# 2015/08/23
+#
+
+if [ $# -ne 2 ]; then
+    printf "Usage:\n"
+    printf "    `basename $0` <input_img> <output_img>\n"
+    exit 1
+fi
+
+INIMG="$1"
+OUTIMG="$2"
+
+# Get the rotation angle from "ROLL_PNT" keyword
+punlearn dmkeypar
+ROTANGLE=`dmkeypar ${INIMG} ROLL_PNT echo=yes`
+printf "## rotation angle (degree): ${ROTANGLE}\n"
+
+# Determine the rotation center
+ROTXCENTER=`dmlist ${INIMG} blocks | grep '^Block.*1:' | tr '(x)' ' ' | awk '{ print $(NF-1)/2 }'`
+ROTYCENTER=`dmlist ${INIMG} blocks | grep '^Block.*1:' | tr '(x)' ' ' | awk '{ print $NF/2 }'`
+printf "## rotation center (pixel): (${ROTXCENTER},${ROTYCENTER})\n"
+
+# Rotate the image with "dmregrid2"
+printf "# rotate image ...\n"
+TMP_ROT_IMG="_rot_${INIMG}"
+punlearn dmregrid2
+dmregrid2 infile="${INIMG}" outfile="${TMP_ROT_IMG}" \
+    theta=${ROTANGLE} rotxcenter=${ROTXCENTER} rotycenter=${ROTYCENTER} \
+    clobber=yes
+
+# Determine the central point in _physical_ coordinate of the rotated image
+punlearn get_sky_limits
+get_sky_limits ${TMP_ROT_IMG} verbose=0
+XYGRID=`pget get_sky_limits xygrid`
+XC=`echo "${XYGRID}" | awk -F'[:,]' '{ print 0.5*($1+$2) }'`
+YC=`echo "${XYGRID}" | awk -F'[:,]' '{ print 0.5*($4+$5) }'`
+
+# Determine the crop box size
+## determine ACIS type {{{
+punlearn dmkeypar
+DETNAM=`dmkeypar ${TMP_ROT_IMG} DETNAM echo=yes`
+if echo "${DETNAM}" | \grep -q 'ACIS-0123'; then
+    printf "## \`DETNAM' (${DETNAM}) has chips 0123 => ACIS-I\n"
+    WIDTH="2066"
+    HEIGHT="2066"
+elif echo "${DETNAM}" | \grep -q 'ACIS-[0-6]*7'; then
+    printf "## \`DETNAM' (${DETNAM}) has chip 7 => ACIS-S\n"
+    WIDTH="1024"
+    HEIGHT="1024"
+else
+    printf "ERROR: unknown detector type: ${DETNAM}\n"
+    exit 11
+fi
+printf "## set crop box size: ${WIDTH}x${HEIGHT}\n"
+## ACIS type }}}
+CROP_REG="rotbox(${XC},${YC},${WIDTH},${HEIGHT},0)"
+printf "## crop region: ${CROP_REG}\n"
+
+# Crop the rotated image to match CCD size
+printf "# crop rotated image ...\n"
+punlearn dmcopy
+dmcopy "${TMP_ROT_IMG}[sky=${CROP_REG}]" ${OUTIMG} clobber=yes
+
+# Clean temporary file
+rm -f ${TMP_ROT_IMG}
+