Chandra Deep Field South ======================== The Chandra Deep Field South is centered on: RA(ICRS) = 03 32 28.2 Dec(ICRS) = -27 48 36 To deliver user-friendly, combined data products, we have merged: A. 12 CDF-S observations (obsid = 8591, 8592, 8593, 8594, 8595, 8596, 8597, 9578, 9593, 9596, 9718, 9575) taken during Sep. - Nov. 2007. Total exposure: 980 ks. B. 9 CDF-S observations (obsid = 441, 582, 1672, 2239, 2312, 2313, 2405, 2406, 2409) taken during May - Dec. 2000. Note that we excluded two observations (obsid = 581, 1431) taken in 1999 with CCD temperature = -110C, because of the problem in the corresponding calibration data. We will regenerate the combined data set with all 11 observations after reliable calibration data are available. Total exposure: 855 ks. C. All 21 CDF-S observations including 2000 and 2007 data. Again two 1999 observations (obsid = 581, 1431) are excluded. Total exposure: 1835 ks. We removed cosmic-ray afterglows (using a CIAO tool, acis_detect_afterglow), refined astrometry based on the matched source positions and reprojected onto a common tangent plane (using a CIAO tool, reproject_aspect). The relative offsets (from obsid 9575) for individual observations are listed below for reference. We then regenerated level 2 event files (using CXC pipelines), and merged individual evt2 files (using a CIAO tool, merge_all). The main merged data products are: A. for 2007 data only acismCDFS_2007N000_evt2.fits final merged event list for ccdid=0-3 acismCDFS_2007N000_expmap.fits final merged exposure map acismCDFS_2007N000_full_img2.fits full image in energy=0.5-6 keV acismCDFS_2007N000_colorimg.jpg true color image made with 3 energy bands (0.5-1, 1-2, 2-6 keV). These products are tarred up in: CDFS2007merge.tar B. for 2000 data only acismCDFS_2000N000_evt2.fits acismCDFS_2000N000_expmap.fits acismCDFS_2000N000_full_img2.fits acismCDFS_2000N000_colorimg.jpg These products are tarred up in: CDFS2000merge.tar C. for all 2000+2007 data acismCDFS_2000-2007N000_evt2.fits acismCDFS_2000-2007N000_expmap.fits acismCDFS_2000-2007N000_full_img2.fits acismCDFS_2000-2007N000_colorimg.jpg These products are tarred up in: CDFS2000-2007merge.tar (Please note, if you downloaded the 2007 merged products prior to 30 January 2008, that the file names for those products were changed on that date, to conform with the filename convention used for the 2000 and 2000/2007 merged products, but that the contents of those files have not changed) We also provide the event list and aspect solution for each obsid so that users may merge a sub-sample (e.g,. those with similar roll angles): pcad_[obsid]_reproject_asol1.fits aspect solution per observation acism[obsid]N000_reproj_evt2.fits Level 2 event list per observation These products are tarred up in: CDFS2000byObsId.tar CDFS2007byObsId.tar Table 1. Relative positional offsets of individual observations +------+-----------+-----------+-----------+--------------------------+ | | Rotation | X Transl | Y Transl | | |Obsid | Angle deg | in pixels | in pixels | date-obs | +------+-----------+-----------+-----------+--------------------------+ | 441 | 0.013912 | 0.110785 | 0.676744 | May 27 2000 | | 582 | -0.000547 | 0.579786 | 0.708504 | Jun 3 2000 | | 2406 | -0.003622 | 0.182944 | 0.015473 | Dec 10 2000 (1st asol) | | 2406 | -0.003622 | 0.182944 | 0.015473 | Dec 10 2000 (2nd asol) | | 2405 | -0.025631 | -0.018550 | -0.126795 | Dec 11 2000 | | 2312 | -0.015662 | -0.180815 | -0.086823 | Dec 13 2000 | | 1672 | -0.015959 | -0.090808 | -0.033373 | Dec 16 2000 | | 2409 | -0.002817 | 0.265013 | 0.167656 | Dec 19 2000 | | 2313 | -0.024247 | -0.082925 | -0.003701 | Dec 21 2000 | | 2239 | -0.025871 | -0.396759 | -0.107328 | Dec 23 2000 | +------+-----------+-----------+-----------+--------------------------+ | 8591 | -0.002689 | -0.190693 | 0.273417 | Sep 20 2007 | | 9593 | -0.005447 | 0.016670 | 0.509791 | Sep 22 2007 | | 9718 | -0.004962 | 0.111269 | 0.188725 | Oct 3 2007 | | 8593 | -0.001654 | 0.420111 | 0.054327 | Oct 6 2007 | | 8597 | 0.000681 | 0.046893 | 0.423655 | Oct 17 2007 | | 8595 | 0.012526 | 0.251524 | 0.594546 | Oct 19 2007 | | 9575 | -0.000000 | 0.000000 | 0.000000 | Oct 27 2007 ** reference | | 8592 | -0.013634 | -0.203369 | 0.199928 | Oct 22 2007 | | 8596 | 0.016394 | -0.146683 | 0.222187 | Oct 24 2007 | | 9578 | -0.005973 | 0.057269 | -0.550306 | Oct 30 2007 | | 8594 | -0.006194 | -0.064804 | 0.297714 | Nov 1 2007 | | 9596 | 0.017150 | 0.034316 | 0.147677 | Nov 4 2007 | +------+-----------+-----------+-----------+--------------------------+ (1 pixel = 0.492 arcsec) Table 2. Dates, exposure times, and roll angles of individual observations +-----+-------------+--------+-----+ | | |Exposure| Roll| |Obsid | date-obs | (ks) |(deg)| +------+-------------+--------+-----+ | 441 | 27 May 2000 | 57 | 167 | | 582 | 3 Jun 2000 | 142 | 163 | | 2406 | 10 Dec 2000 | 30 | 332 | | 2405 | 11 Dec 2000 | 60 | 332 | | 2312 | 13 Dec 2000 | 125 | 330 | | 1672 | 16 Dec 2000 | 107 | 327 | | 2409 | 19 Dec 2000 | 70 | 319 | | 2313 | 21 Dec 2000 | 132 | 319 | | 2239 | 23 Dec 2000 | 132 | 319 | +------+-------------+--------+-----+ | 8591 | 20 Sep 2007 | 46 | 73 | | 9593 | 22 Sep 2007 | 47 | 73 | | 9718 | 3 Oct 2007 | 50 | 62 | | 8593 | 6 Oct 2007 | 50 | 62 | | 8597 | 17 Oct 2007 | 60 | 44 | | 8595 | 19 Oct 2007 | 117 | 41 | | 9575 | 27 Oct 2007 | 110 | 32 | | 8592 | 22 Oct 2007 | 88 | 32 | | 8596 | 24 Oct 2007 | 117 | 32 | | 9578 | 30 Oct 2007 | 39 | 24 | | 8594 | 1 Nov 2007 | 143 | 24 | | 9596 | 4 Nov 2007 | 113 | 20 | +------+-------------+--------+-----+