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Please also refer to the <A HREF="/docs/asca/ahp_data_proc.html">Data Processing</A> page, which documents what have been done at GSFC to produce these data. </BLOCKQUOTE> <P> <H3>Data Analysis Guides - The Essentials</H3> <P> <UL> <li> <A HREF="/docs/asca/asca_faq_nonexp.html"><B><I>ASCA</I> analysis FAQ for non-experts</B></A> (researchers/students who are new to X-ray astronomy) <p> <li> <a href="/docs/asca/abc/abc.html">The <i>ASCA</i> Data Reduction Guide (formerly the ABC Guide)</a> (also available in <a href="https://heasarc.gsfc.nasa.gov/FTP/asca/doc/abc_guide.ps">Postscript</a> and <a href="https://heasarc.gsfc.nasa.gov/FTP/asca/doc/abc_guide.ps.gz">gzipped Postscript</a> format). Updated 2001 March 30. <li> <A HREF="/docs/asca/watchout.html"><STRONG>Things to Watch Out For</STRONG></a> <b> (& Warning about SIS data below 1 keV and bgd subtraction of recent data)</b> when doing ASCA analysis (a new feature, updated 2001 February 13) <li> <a href="/docs/asca/cal_probs.html">Calibration Uncertainties</a> - updated 2001 February 13. </UL> <P> <H3>Data Reduction and Analysis Procedures - Further Details</H3> <P> <UL> <LI> The "why and how" of <A HREF="/docs/asca/screening.html"><B><I>ASCA</I> Data Screening</B></A>, including: <UL> <LI> <a href="/docs/asca/abc/node6.html#SECTION00600000000000000000">Screening your own data.</a> </UL> <LI> The "why and how" of <A HREF="/docs/asca/background.html"><B><I>ASCA</I> Background Subtraction</B></A>, including: <UL> <li> <a href="/docs/asca/mkgisbgd/mkgisbgd.html">New point-source removed GIS blank sky database released</a> <LI> <A HREF="/docs/asca/sis_blank.html">A table of SIS blank fields</A> observed since 1996. </UL> <p> <li> <a href="/ftools/xselect/xselect.html">Xselect Users Guide</a> <li> <a href="/docs/software/ftools/asca.html">ASCA FTOOLS Package</a> <li> References to help <a href="/docs/asca/ascaidlsys.html">analyze <i>ASCA</i> data with IDL</a> <p> <li> Combining spectra from different instruments and chips with the FTOOL <a href="/docs/asca/adspecinfo.html">addascaspec.</a> <li> <a href="/docs/asca/make_ascaray_images">How to create ARFs for extended sources</a> <P> <LI> <A HREF="/docs/asca/asca_faq_data.html"><EM>ASCA</EM> analysis FAQ for expert users</A> </UL> <P> <H3>Calibration News</H3> <P> Please see the <A HREF="/docs/asca/calibration/"><B><EM>ASCA</EM> Calibration</B></A> page for full details on calibration files, cross-calibration with other missions, and more. Listed below are selected highlights and news: <P> <UL> <li> <A HREF="/docs/asca/calibration/oldvscurrent.html">Effect of Changes in the <EM>ASCA</EM> Calibration on Spectral Parameters</A> <li> <a href="/docs/asca/gisgain_2002-June/announce.html">GIS gain calibration of recent observations</a> <EM>This supersedes the earlier (2001 April) reprocessing and affects more sequences.</EM> - 2002 Jun 26. <li> The <A HREF="ftp://heasarc.gsfc.nasa.gov/asca/sis_information/sisph2pi_290301.fits">Latest CTI calibration file</A> - this includes a preliminary calibration of the <a href="/docs/asca/cti_nonlinear.html">Non-linear Secular Evolution of the SIS CTI</a> and the <A HREF="/docs/asca/nucti.html">Updated Calibration of Non-uniform CTI</A> (March 30, 2001). </UL> <P> <H3>Software News</H3> <P> Please refer to <a href="/docs/asca/softnews.html"><b>Software News</b></A> for full details (see also the <a href="/docs/software.html">HEASARC Software</a> page). The most recent entries on the Software News page are: <P> <UL> <LI> <A HREF="/docs/asca/soft_ascabug.html">Known bugs/features in the <i>ASCA</i> data analysis software</a> - updated 2002 Jun 26. <LI> <A HREF="/docs/asca/heasoft_v52.html">HEAsoft v5.2 <i>ASCA</i> release notes</a> (Created 2002 Jun 26) </UL> <P> <H3>Instrument News</H3> <P> <UL> <li> <a href="/docs/asca/xrtnews.html"> XRT News (Image and Extended Source Analysis)</a> - updated 1997 July 15 . <li> <a href="/docs/asca/gisnews.html"> GIS News</a> - updated 2001 April 12. <li> <a href="/docs/asca/sisnews.html"> SIS News</a> - updated 2001 March 30. </UL> <P> <h3>Older Items</h3> <ul> <LI> <A HREF="/docs/asca/ascascreen.html">ASCASCREEN rejected almost all my data !</A> <li> <a href="/docs/asca/fname.html">File name description</a> for Rev1 and Rev2 data. - what you can do to fix this <LI> <A HREF="/docs/asca/abc_gis3_bitfix.html"> Fixing the GIS3 bit problem</A> for observations between 1994 Feb 10 and Apr 8 <p> </ul> <p> <hr> <i>This file was last modified on Tuesday, 12-Oct-2021 14:34:41 EDT</i> <br> Curator:<webpoc> <A target="_top" HREF="http://heasarc.gsfc.nasa.gov/docs/bios/marida.html">Michael Arida</A> (SP Sys); <a href="mailto:arida@milkyway.gsfc.nasa.gov">arida@milkyway.gsfc.nasa.gov</a></webpoc><br> HEASARC Guest Observer Facility <hr> If you have any questions concerning <a href="/docs/asca/asca2.html"> ASCA</a>, visit our <a href="/cgi-bin/Feedback">Feedback form</a>.<p> <span class=footer>This file was last modified on Tuesday, 12-Oct-2021 14:34:41 EDT</span> </td></tr> <tr><td bgcolor="cccccc" colspan=3> <table cellpadding=5><tr><td> <span class="footer"> <p align="center">  <a href="http://science.nasa.gov/astrophysics/">NASA Astrophysics</a> </p> <LI><a href="/docs/faq.html"> FAQ/Comments/Feedback</a> <LI><a href="/docs/outreach.html"> Education Resources</a> <LI><a href="http://www.adobe.com/support/downloads/main.html"> Download Adobe Acrobat</a> </span> </td> <td valign=top> <span class="footer"> A service of the <A HREF="http://astrophysics.gsfc.nasa.gov/"> Astrophysics Science Division (ASD)</A> at <A HREF="http://www.nasa.gov/">NASA/</A> <A HREF="http://www.nasa.gov/goddard">GSFC</A><br> <p> ASCA Project Scientist: <A HREF="/docs/bios/white.html"> Dr. Nicholas E. 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