|Chandra Electronic Bulletin No. 8|
******************************************************************************** | | | CCC XX XX OOO | Chandra | CC XX XX OO OO | CXC Electronic | CC XXX OO OO | Number 8 Bulletin | CC XX XX OO OO | November | CCC XX XX OOO | 2001 | | ******************************************************************************** Welcome to the Chandra X-ray Center's Electronic News Bulletin Number 8. CXC Web site: cxc.harvard.edu If you would like to unsubscribe from this alias, simply reply to this message to let us know. Contents: 1. DDT data on the Neutron Star RX J 185636-375 now available 2. CIAO 2.2: New Threads 3. Chandra Press Releases 4. Location of ASPSOL and OBCSOL files ------------------------------------------------------------------------------- Item 1. DDT data on the Neutron Star RX J 185636-375 now available =================================== The 4 Cycle 2 observations of the Neutron star RX J 185636-375 are now available in the Chandra public archive. Information and links to the Cycle 2 data, the Cycle 1 observation and various combinations of the data can be found on our website, direct link: http://asc.harvard.edu/target_lists/extra/ns.html ------------------------------------------------------------------------------- Item 2. CIAO 2.2: New Threads =================================== Hello Chandra Users Now that the CIAO 2.2 software package has been released, the weekly email updates of new and updated analysis threads is resuming to the chandra_users email discussion group. (Instructions for signing up at http://asc.harvard.edu/chandra-users/discussion_group.html ). All the threads were reviewed and updated to take into account new tool functionality; all those updates will not be outlined here as there are many. Remember that the CIAO threads page is located at http://cxc.harvard.edu/ciao/documents_threads.html. If you have not yet done so, you can download CIAO 2.2 from http://cxc.harvard.edu/ciao/download_ciao_reg.html. As always, please send questions to the CXC HELPDESK (http://cxc.harvard.edu/helpdesk/) and comments on the threads to firstname.lastname@example.org. Liz Galle, for the CIAO Documentation Team --Summary of Changes-- Ten new threads have been added; these threads were made possible by new tools or tool upgrades in CIAO 2.2: Introduction to Toolagent http://cxc.harvard.edu/ciao/threads/toolagent.thread.html Toolagent is a component of the CIAO graphical user interface (GUI) applications that makes it possible to run command-line tools from within the GUI. The thread outlines the basic tasks - editing parameter files and running tools - and explains how to customize the configuration of toolagent. -- Use the New geom.par File http://cxc.harvard.edu/ciao/threads/geom.par.thread.html A new analysis data file (telD1999-07-23geomN0004.fits) was added to CALDB version 2.9, released on 2001 October 22. The updates to the file are explained, as well as how they affect the data. It then shows how to recreate the level 2 event file, if necessary. -- Create an Image of Diffuse Emission http://cxc.harvard.edu/ciao/threads/diff.image.thread.html This thread describes the method by which one can create a smoothed, exposure-corrected image of diffuse emission. After removing unwanted point sources from the image, it uses one of the new CIAO 2.2 tools, dmfilth, to fill in the holes left behind. -- Use merge_all Script to Compute ACIS Exposure Maps and Fluxed Image "http://cxc.harvard.edu/ciao/threads/merge_all.thread.html XS A wide variety of exposure maps may be created using the script merge_all. It can take as input an arbitrary number of level 2 event files, the corresponding aspect solution files, and a list of the CCD numbers in which you are interested. The script creates a merged level 2 event file and, if you like, a merged exposure map and exposure-corrected image for these CCDs. -- Weighting ARFs and RMFs http://cxc.harvard.edu/ciao/threads/wresp.sources.thread.html If you want to extract the spectrum of a large region, or combine data from multiple regions (either from the same or different observations), then you may need to use a weighted ARF and RMF for the spectral analysis. This thread describes how you can use the mkwarf (new to CIAO 2.2) and mkrmf tools to create the weighted responses. -- Create Grating RMFs http://cxc.harvard.edu/ciao/threads/mkgrmf.thread.html This thread describes when it is necessary to run the new tool mkgrmf to create a grating RMF (gRMF) file, as opposed to when it is sufficient to use the gRMFs distributed in the CALDB. -- Create a Color Spectrum http://cxc.harvard.edu/ciao/threads/gratingcolor.thread.html This thread uses the dmimg2jpg tool to create a color spectrum of grating data. It goes through examples in both sky coordinates and grating angular coordinates. -- Fitting Spectral Data With/Without Independent Background Responses http://cxc.harvard.edu/ciao/threads/sherpa.sourceandbg.html There have been some changes made in how Sherpa treats background data; it may be fit alone, with no source data specified, and background datasets may have their own instrument models. One of the examples that this thread goes through is fitting the source and background with independent responses. -- Fitting Spatial (2-D) Data: Using an Exposure Map http://cxc.harvard.edu/ciao/threads/sherpa.expmap.html This thread shows how to use the EXPMAP command in Sherpa to define an exposure map model. The exposure map file is input to Sherpa through the GRIDMODEL command and then can be used in fitting image data. -- CIAO and S-Lang http://cxc.harvard.edu/ciao/threads/ciao22.slang.html CIAO 2.2 provides a number of significant improvements in the interface between the CIAO system and the S-Lang programming language. Unfortunately, some of the improvements in CIAO 2.2 have lead to incompatabilities with S-Lang code written for previous versions of CIAO. We provide here a list of these issues as well as some basic examples on using S-Lang. ------------------------------------------------------------------------------- Item 3. Chandra Press Releases =================================== Dear Chandra Users, I would like to take this opportunity to remind you of the procedures involving publicity. (Please note that if you allow your colleagues or students to use your data for scientific research, you are responsible for making them aware of these guidelines.) In addition to the press guidelines below, I encourage anyone with a visually interesting image to bring it to my attention as a candidate 'image release'. Please take particular note of the information regarding scientific meetings, as we are rapidly approaching the January AAS meeting in Washington, DC. Feel free to call or email me at any time. Thank you. Megan Watzke Chandra X-ray Center Press Officer 617-496-7998 email@example.com When Should a Chandra News Release be Issued? 1. Presentation at a major scientific meeting. If you know of a potentially interesting result that is to be presented at a meeting, please contact Megan Watzke as soon as possible. The Chandra X-ray Center (CXC) does not need to wait for an invitation from meeting organizers to write a press release. If we know of a particular exciting result, we can then ask the AAS to consider us for a press conference. Additionally, press officers for a scientific meeting (usually the AAS's Steve Maran or Lynn Cominsky) send out emails to scientists about the potential newsworthiness of a submitted abstract. If you are contacted by Steve Maran or Lynn Cominsky for the January AAS meeting, for example, please follow the procedures outlined below. 2. Acceptance of a paper to a scientific journal. If you plan to submit a paper to Science or Nature, please contact Megan Watzke immediately. These journals have strict policies about publicizing their publications and the more advanced the warning the CXC has to work with these journals the better. Please contact Megan with any other potentially newsworthy papers once a paper is submitted or immediately after notice of acceptance. 3. Breaking story or time-sensitive discovery. This is probably the trickiest situation for a press release. Occasionally, there might be a Chandra result that should be rushed through the system. However, this situation is rife with the potential for the need to retract--something that NASA and CXC would like to avoid if at all possible. However, if there is a result with any urgency, contact the CXC Press Office immediately. Procedures for Chandra News Releases: If you determine that your Chandra data might warrant a press release, get in touch with CXC Press Office at 617-496-7998, or send email to firstname.lastname@example.org. At this point, the CXC Press Office will consult with NASA HQ and MSFC to decide the best organization to put out the release. NASA has first right of refusal for any newsworthy information, which means that NASA HQ needs to review any potential press release. If NASA does not choose to issue the release, CXC/MSFC may choose to issue the news via its Press Office. Whether the release is issued as a CXC/MSFC or NASA/CXC/MSFC release, Megan Watzke will be responsible for consulting with the scientists, preparing the release, and getting final drafts approved by appropriate parties. The CXC/MSFC will also make sure the release goes out to media outlets and that release and images are posted on the chandra.harvard.edu and chandra.nasa.gov websites. If the CXC Press Office passes on doing a release, then the Principal Investigator (PI) has the option to ask his/her organization's News Office (also called Public Information Offices in many institutions) to write a release. As additional support, the NASA Structure and Evolution of the Universe theme employs a science writer, Christopher Wanjek (email@example.com), who can either write the release or work with a News Office to prepare a draft. A copy of the release and any accompanying images must be sent to the CXC Press Office as soon as possible, so that the CXC Press Office, NASA HQ and MSFC can be aware of all Chandra-related news being disseminated. Please keep in mind that in this situation, the PI would be responsible for all images, websites, etc. regarding the release. The CXC may mirror the release on its public site as well. In any case, Megan Watzke will inform the News Office of the Principal Investigator whenever a press release involving that Principal Investigator is being written, and will assure that the News Office of the Principal Investigator is included when circulating drafts for review. More information on Chandra press release guidelines can be found on the Chandra website at http://chandra.harvard.edu/press/release_guidelines.html. Megan Watzke ------------------------------------------------------------------------------- Item 4. Location of ASPSOL and OBCSOL files =================================== There has been some confusion recently about the use and location of the ASPSOL and OBCSOL files (filenames pcadf*asol.fits and pcadf*osol.fits, respectively) in Chandra data distributions. "ASPSOL" and "OBCSOL" are the values of the CONTENT keyword in their headers, the official way to distinguish data products. The ASPSOL files are the result of ground-based aspect analysis using all PCAD data. The OBCSOL files are based on aspect determined by the On-Board Computer (OBC). Ground processing gives a better product, clearly, because more information is available. ASPSOL has been moved from the Secondary to the Primary Data Products category because it is essential for making exposure maps. This change took place in June 2001 for ChaSeR, Nov 2001 for the provisional archive interface and in Sept 2000 in propietary datasets. The Primary Products are now all you need to run any of our Threads, as was the original CXC intent (ASPSOL was the only hold-out in that respect). The OBCSOL files were left in the Secondary category, where they belong. Arnold Rots This Electronic Bulletin is used for the dissemination of important announcements and information about the Chandra X-Ray Observatory to members of the community. If you wish to unsubscribe from the list, please let us know by filling out a Helpdesk ticket (asc.harvard.edu and click on "Helpdesk") or emailing firstname.lastname@example.org.
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