28 March 1997 Dear BeppoSAX user, this is the forth BeppoSAX "e-mail news" message and covers the following topics: 1. Reprocessed LECS data 2. BeppoSAX AO1 papers 3. BeppoSAX sources naming convention 4. Rise time thresholds for PDS data 1. Reprocessed LECS data - ----------------------- Because of a software bug in the FOT production system, a fraction of good LECS data was rejected by the SAXDAS reduction software. In some rare cases this fraction amounted to a large part of the observation. In most cases the fraction of good data lost was of the order of 10-20%. The exposure times and count rates were computed correctly by the SAXDAS software, simply, part of good LECS data was not used. The bug was fixed on February 6th 1997, so the data processed after this date are free from this problem. All affected FOTs have been regenerated and reprocessed. New cleaned and linearized event files have been produced and will be made available through the on line archive within the next week. The files will be referred to as "rev0.2". Additional information can be requested as usual sending an e-mail to helpdesk@sax.sdc.asi.it or calling us at: +39 6 4079 6307/6327/6328/6325 The following table shows the net LECS exposure times obtained with the old and new FOTs. Target true/old_exposure (seconds) 0620-52: 4458 / 3387 0625-53: 3588 / 2882 1226+023A: 13603 / 13603 1226+023B: 13284 / 13288 1253-055A: 7428 / 5766 1253-055B: 8399 / 1605 1253-055C: 523 / 523 1253-055D: 4188 / 4188 1E2259+586: 13818 / 11257 1Es1101-232: 6150 / 5199 1Es1133+704: 5248 / 4073 1Es2344+514A: 4719 / 3808 1Es2344+514B: 5264 / 4270 1Es2344+514C: 3515 / 2779 1Es2344+514D: 5563 / 4431 1Es2344+514E: 2992 / 2337 4U0142+61: 19663 / 15427 A33: 39058 / 34103 A348: 33657 / 26865 Betacet: 17561 / 14293 Blhyi: 3708 / 2991 Etacarinae: 17422 / 3325 Hd110432: 2309 / 1537 Hd28357: 11870 / 11870 Hd49798: 36521 / 28847 Hd9770: 40419 / 31886 Ngc1068: 62485 / 49565 Ngc253: 54689 / 32755 Ngc3081: 8916 / 7440 Ngc4941: 14280 / 12797 Ngc7674: 48554 / 40054 Om-161: 13782 / 11142 Ox-158: 4704 / 3906 Pictora: 12025 / 5271 Pks1144-379: 10834 / 8240 Psr1055-52: 22188 / 17964 Psrj0437-471: 11145 / 11145 Re0751+14: 28433 / 24995 Scg2353-6101: 25462 / 25462 Smcx-1: 6848 / 5750 Tons180: 12013 / 9192 Too-Grb: 11594 / 11594 Velanerim: 5649 / 4477 Velax-1: 60358 / 27436 Xper: 53806 / 48363 2. BeppoSAX AO1 papers - ------------------- As of today data for more than 100 AO1 observations have been delivered to PIs and a number of papers discussing these data are probably in preparation. In an effort to keep track of all BeppoSAX publications we would be very grateful if you could send us a copy of your paper (submitted or accepted) as a postscript file sent by E-mail to helpdesk@sax.sdc.asi.it with the relevant information about the author/source in the subject (or paper version sent to SAX/SDC c/o Nuova Telespazio, via Corcolle 19, I00131 Roma Italy). If your publication makes use of data retrieved from the SAX SDC on line archive the following (or equivalent) acknowledgement would be appreciated: "This research has made use of SAXDAS linearized and cleaned event files (rev0.X) produced at the BeppoSAX Science Data Center." 3. BeppoSAX new sources naming convention - -------------------------------------- We reccommend to use the following convention (compliant to IAU specifications, see http:/cdsweb.u-strasbg.fr/iau-spec.html) when naming a source found in one of the BeppoSAX instruments: 1SAX JHHMM.f+ddmm or 1SAX JHHMM.f-ddmm where: J refers to the equinox 2000.0 to be used for the coordinates system HH is the RA hour MM is the RA minutes f is the RA decimal fraction of minutes = int(SS/6), where SS are the RA seconds + or - is the sign of the source declination dd is the DEC degrees mm is the DEC arcminutes if you want to use equatorial coordinates. Alternatively, if you prefer Galactic coordinates: 1SAX GLLL.ll+BB.bb or 1SAX GLLL.ll-BB.bb where: LLL is the Galactic longitude in degrees ll is the decimal fraction of the Galactic longitude BB is the Galactic latitude in degrees bb is the decimal fraction of the Galactic latitude Examples: source name RA (J2000.0) DEC 1SAX J1749.6-2803 17 49 36.9 -28 03 59 1SAX G001.2-00.3 17 49 36.9 -28 03 59 4. Rise time thresholds to analyze PDS data - ----------------------------------------- The XAS version 2.0.1 contains a bug in the scripts `pds_dir' to automatically reduce the PDS data. The RiseTime thresholds have been uncorrectly set to 70, 105 for the DIR001 and DIR002 mode data. If you have installed the 2.0.1 XAS version you must either edit the script `pds_dir' and change the lines indicated by arrows: 1 | 2) pds_packet=pddir00$2 nchannels=1023 rtime_in_packet=1 rtime_low=70 <---------- rtime_hi=105 <---------- flags='0 0';; into: rtime_low=3 <---------- rtime_hi=150 <---------- or retrieve the new script from our anonymous ftp site on www.sdc.asi.it, directory `pub/software/xas/pds_dir.gz' Versions 2.0.2 or higher are not affected by such a problem. ------------------BeppoSAX SDC useful addresses and numbers---------------- WWW home page http://www.sdc.asi.it/ anonymous ftp www.sdc.asi.it phone +39 6 40796307 (M.E. Pennisi, SDC secretary) fax +39 6 40793855, +39 6 40796291 e-mail helpdesk@sax.sdc.asi.it p-mail address BeppoSAX Science Data Center ASI c/o Nuova Telespazio via Corcolle 19 00131 Roma Italy how to reach us http://www.sdc.asi.it/howreach.html ---------------------------------------------------------------------------