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* --- EXSAS --- Version JANUARY 1996 *
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15-DEC-95 CREATE/SOURCE_DETECT_IMAGE: parameter [pet] now defaulted to
events.tbl. Parameter [ampl] has new default 1-256.
(DOE - 3862/3340)
15-DEC-95 DETECT/SOURCES : parameter [ima] now defaulted to image1.bdf,
parameter [pem] now defaulted to events.tbl
(DOE - 3862/3340)
15-DEC-95 CREATE/BG_IMAGE, CREATE/SMOOTHED_BG, DETECT/MAP, MERGE/SOURCES,
DETECT/MAXLIK, COMPUTE/UPPER_LIMITS, DETECT/SOURCES:
All of the code dealing with background calculations has been
revised:
o all calculations done in REAL instead of INTEGER
o CREATE/BG features automatic rebinning of the fitted map
in case of low photon statistics. Increased accuracy. Runs
also faster now.
o capable of handling very low backgrounds (down to 0.00001
cts/pixel).
o background scale factor now obsolete, defaulted to 1.
o background countrate column in all source lists with 5
significant decimals
If you want to use older background maps with a background scale
factor different from 1., check if descriptor BG_SCALE exists.
If it does exist, you can use them as before.
(DOE - 3862/3340)
23 Jan 1996 - The command READ/RANGES is upgraded, now it works
with any Projection table and supply a complete description
of spatial selection applied to data. Read Help!
(Izzo-3313)
29-JAN-96 PROCESS/HK : an updated solar activity file led to incorrect
column densities N_O, etc. This was caused by an array limit of
2000 in an initialization routine. This number has now been
changed to 4000 (which extends the validity beyond the year 2001)
Affected: column densities [N_O, N_O2, N_A, N_H, N_N, N_He] in
output table if called after 16-JAN-1996 16:49. All other table
columns were not influenced.
The command PROCESS/HK now also works if the eventsrates file is
missing, orbit and attitude data are still required.
(MJF - 3849)
29-JAN-96 CREATE/NORTH_ALIGNED_IMAGE : works also for very small rotation
angles. (AJV, DOE - 3343)
29-JAN-96 CREATE/EXPOSURE : useable again for non-centered reference images
(images where the image center does not coincide with sky pixel
coordinates 0,0 = nominal pointing direction).
(DOE - 3343)
30-JAN-96 FIT/SPECTRUM & MODEL/SPECTRUM :
An inconsitent definition of the number of model parameters in the
spectral models *tblm* and *tbef* has been corrected. The bug
resulted in warnings like "Unaligne access......" but did not "
affect the fitting results.
(WEB - 3588)
07-Feb-96 New SCC to UTC calibration: Version 2_95
The conversion of space craft clock times from SCC to UTC is now
based on clock calibration data up to 11-Dec-1995. Conversion
after this date is done by extrapolation. Plots showing the
residuals of the scc/utc polynomial fits for the years 1990 to 95
can be found in the ROSAT service area under (.../exsas/scc_utc).
Three new descriptors (Version, Validity & Producer) have been
introduced with this release for identification purposes.
(WEB - 3588)
16-Feb-96 Some descriptors in the default detector response matrix files
have been changed. In the case of problems please contact me asap.
(WEB - 3588)
27-Feb-96 FIT/SPECTRUM & MODEL/SPECTRUM :
The maximum number of grid steps has been changed from 50 to 100.
(WEB - 3588)
15-MAR-96 INTEGRATE/FLUX:
Checks now if the integrated flux was computed taking the galactic
absorption model GAMM() into account. If the integrated flux is the
absorbed flux a note is given on the screen.
(WEB - 3588)
19-MAR-96 EXSAS'96 for LINUX.ELF
=======================
A new version of EXSAS'96 for Linux (Kernel version 1.2.13 - ELF)
optimised for INTEL Pentium and i486 CPU's is available from the
the ROSAT service area (/info_svc/rosat_svc/exsas/96JAN_EXP_Linux).
The disk space required to install MIDAS (release 95NOV) and EXSAS
is about 100 MB. MIDAS (95NOV) for LINUX.ELF is available from ESO
and /info_svc/rosat_svc/exsas/96JAN_EXP_Linux/95NOVpl2_MIDAS. To
support a fast and easy installation of the new software releases
1.44 MB floppys with EXSAS'96 and a MIDAS CD-ROM are available on
request.
(WEB - 3588)
20-Mar-96 New version of IDENTIFY/SOURCE available. Enhanced functionality,
see on line help.
(H.U.Zimmermann - 3593)
21-MAR-96 INTEGRATE/FLUX:
The source code has been revised and optimized for the special
task of flux integration. In the case of problems please contact
me asap.
(WEB - 3588)
15-APR-96 NEW Command: PLOT/PULSE_PROFILE:
Produces a fancy plot of the bined pulse profile deduced by a
photon arrival time analysis using Make/Folding. See the help
file for a more detailed description of the calling syntax.
(WEB - 3588)
25-APR-96 CREATE/EXPOSURE_MAP: bug fixed.
The deadtime correction is now applied correctly. Since the default
is no deadtime correction , most exposure maps produced earlier
should not have been affected.
(DOE - 3343)
30-APR-96 DETECT/MAXLIK, COMPUTE/UPPER
Now rows in the merged input source list mplst.tbl can be sorted,
edited, or selected in any way before running source detection.
Until now it was possible that part of the sources in such modified
merged source lists were skipped, and not fitted.
(DOE - 3343)
20-JUN-96 CALCULATE/GALACTIC_NH (!!!)
The unit of the output has been changed from 10^20 1/cm^2 to
10^21 1/cm^21 to reach agreement with the units of Nh used in the
parameter files of the spectral fiting procedures.
(WEB - 3588)
24-JUN-96 New Command: => CONVERT/CTS2FLX <=
The program computes the energy flux for a given count rate and
spectral model. See the online help for a detailed description of
the command syntax. Additional background information on how the
command works can be found on the EXSAS Spectral Analysis Homepage.
See: http://www.rosat.mpe-garching.mpg.de/~web/exsas.html
(WEB - 3588)
03-JUL-96 CONVERT/CTS2FLX has been renamed to CONVERT/RATE_TO_FLUX
(WEB - 3588)
09-JUL-96 CORRECT/BARYCENTER
The Julian days of the leap seconds which were used to compute the
number of leap seconds since 1972 have refered to 12h rather than
to 0h, the actual time the leap second was introduced. This
results in errors for pulse arrival time measurements if the pulsar
observation was performed at that day where the leap second was
applied. The leap second reference times are now correct.
(WEB - 3588)
27-AUG-96 PROCESS/HK
The solar and geomagnetic activity file has been updated. The data
are neccessary for the atmospheric calculations. The validity range
is now from launch till 31-JUL-1996.
(MJF - 3849)
05-SEP-96 INTEGRATE/RING
Works now also for shrunken images.
( LOAD/IMAGE image scale=negative value ) (DOE - 3343)
09-SEP-96 DETECT/LOCAL does not produce sources with background < 0 anymore.
(DOE - 3343)
17-SEP-96 CORRECT/BARYCENTER
is now using the first and last photon event time of the given
table to check for consistency with the orbit file. Before only the
first and last entry of the TIM_SEL descriptor was used. This has
caused trouble for low count rate objects and prompted the warning:
*Correction table and photon table not compatible. Check the times*
although the orbit file actually covered all photon arrival times
of the given table.
(WEB - 3588)
27-SEP-96 Now MERGE/FILES handles also raw events tables - see help
(IZZO - 3313)
09-OCT-96 PROCESS/CT
This new command is designed for REV2 processed PSPC data. Starting
from raw event tables you can choose a different gain in addition
to all other corrections that are applied by the SASS CT module.
On-line help is available.
(MJF - 3849)
10-OCT-96 The new command EXTRACT/ACCEPTED_TIMES is available. It reads the
TIM_SEL descriptor and creates an output table with start and end
times of accepted intervals. On-line help is available.
(MJF - 3849)
15-OCT-96 New SCC to UTC calibration: Version 1_96
The conversion of space craft clock times from SCC to UTC is now
based on clock calibration data up to 02-Sep-1996. Conversion
after this date is done by extrapolation. Plots showing the
residuals of the scc/utc polynomial fits for the years 1990 to 96
can be found in the ROSAT calibration area or through my homepage
http://www.rosat.mpe-garching.mpg.de/~web/exsas_hp/exsas.html.
(WEB - 3588)