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OSSERVATORIO ASTROFISICO DI ARCETRI
CENTRO PER L'ASTRONOMIA INFRAROSSA
E LO STUDIO DEL MEZZO INTERSTELLARE
LARGO ENRICO FERMI, 5 -- I50125 FIRENZE
Firenze, September 30, 1994
FROM: C. Baffa
TO: Tirgo Staff
SUBJECT: Data handling with Tirgo Nicmos3 instruments
All data taken with Tirgo Nicmos3 instruments (Arnica and Longsp) are stored directly as
standard FITS files at 16 bits integer format.
Every file has an unique name formed from the last 4 digits of the integer part of current Julian
date and from 4 digit of a sequencial number. The acquisition program never rewrites over an old
file. If program is forced to send data to an existing file, it increments automatically the sequencial
number until it get a not already used filename. Sequencial number is protected from casual user,
and should be changed only for special purposes. To each file is associated an one line description,
accessible to DOS dir or in the file ''lista.txt'' on other systems. The comment contains source
name, integration time, and, if telescope is connected, also the coordinates with a limited precision.
An example in table 1.
Volume in drive D is ULTERIORE Serial number is 3713:19EE
Directory of d:``arnica``data``*.*
. !DIR? 111293 9:04
.. !DIR? 111293 9:04
95130049.fts 135360 61094 16:50 NGC4590 K 4.0s 12.39.30 26.45.1
95130050.fts 135360 61094 16:50 NGC4590#00 K 4.0s 12.39.30 26.45.1
95130051.fts 135360 61094 16:51 NGC4590#05 K 4.0s 12.39.30 26.45.1
95130052.fts 135360 61094 16:51 NGC4590#07 K 4.0s 12.39.30 26.45.1
95130053.fts 135360 61094 16:51 NGC4590#08 K 4.0s 12.39.30 26.45.1
1,218,708 bytes in 5 file(s) 1,257,472 bytes allocated
120,770,560 bytes free
Table 1
We have done a precise effort to include in the fits header all relevant informations available to
the system, as source name, telescope position and so on. An example is reported in table 2.
Data are stored in a working directory. Due to limitation of Dos, the more files are present
there, the slower is the processing of a new file. After having collected a between 50 to 100 data
files, observer should exit from acquisition program and use a 4Dos procedure (savedata) to move
data files to a permanent location. The command savedata has no arguments and should just
called. Data will be moved in a directory belonging to a tree of directories which permits to
separate easily data of different dates, as in table 3. Each savedata creates a new subdirectory in
the present day directory.

SIMPLE = T
BITPIX = 16
NAXIS = 2
NAXIS1 = 256
NAXIS2 = 256
ORIGIN = 'T I R G O' / TIRGO Observatory
BSCALE = 1.0000000E+00 / real—value = tape—value * BSCALE + BZERO
BZERO = 0.0000000E+00 / real—value = tape—value * BSCALE + BZERO
BUNIT = 'COUNTS' / Each count corresponds to 19 electrons
OBJECT = 'NGC4590' / Identifier of source
DATEOBS= ' 10/06/94' / UT date of data acquisition
TIMEOBS= ' 15:49:55' / UT Time of data acquisition
JDAY = 9.5131597E+03 / Julia n date of acquisition minus 2440000
DATE = ' 10/06/94' / UT date this file was written
NUMBER = 49 / Incremental acquisition number
INSTRUME= 'ARNICA ' / Device who measured data
OBSERVER= ' Carlo—Baffa' / Observer name
FILTER = ' K 1200 ' / Filter name and wheel position
TIMEINT= 1.0000000E+00 / Integration time on detector 1.0 * 4
COADDS = 4 / Number of frames added togheter
RA = '12.39.30,0' / Right ascension of source
DEC = '26.45.10' / Declination of source
EPOCH = 1.9500000E+03 / Epoch of coordinates
AIRMASS = 2.3000000E+00 / Airmass when acquisition started
DATAMIN = 9.1000000E+01 / minimum value in array
DATAMAX = 9.9990000E+03 / maximum value in array
DOUBLESA= 'ON ' / Double sampling enabled
END
Table 2
D:.
---
+ARNICA
---
+DATA
+SAVE
+94—JUN
---
+JUN—14
--- +1
--- +2
---
+JUN—18
+1
+2
+3
Table 3
2

At the end of each night, data must be moved to the Worm pc disk. Observer must place the
current Worm cartridge in the pc and run the procedure trandata which will automatically copy
data. At the end of copy which can take few hours, the procedure asks if all has be done properly.
If all is OK it deletes data from the hard disk.
Note that trandata can transfer only the data of current civil day, so this operation should be
done before the beginning of the new night, and, for its duration we suggest to run it at the end
of the observation. In case older data should be transferred, please contact me.
We mantain an archive of all data taken with our instruments. Data are stored in a series of
write only cartridge (Worm) each containing nearly 400 Mega bytes of data on each side. Each
cartridge contains data of several weeks of observations, and has a progressive label which identify
the sequence as in DATAa9A and DATAa9B (the two sides of a cartridge). It is a wise idea to
annotate on the ufficial logbook the name of the cartridge in use.
Data can be trasferred to the tirgo sun (tirgo or toutatis). Small amount of data can be
tranferred by ftp, remeber that data must be transferred in bin mode! A procedure called worm2tar
is meant to tranfer all data belonging to an observer together with appropriate standard stars to
a dat cartridge. The procedure scan all Worm subdirectories and transfer all data whose object
names appeare in a given observation catalog. Also all Arnica standars appearing in the same
subdirectories are transferred. The appropriate catalog must be in the
arnica
catalog directory, and the system should be configured properly in order to access dat device on
sun. This operation is NOT intended as a generic user operation and shoud be done by a staff
member. Table 4 lists wor2tar summary usage.
usage: worm2tar obs—cat—name [h host] [u user] [s source] [f destination]
DEFAULTS:
host: toutatis (Sun TIRGO)
user: softir
source: F: (worm drive)
destination: /dev/rst1 (DAT drive)
3