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Twilight/Evening Activities

• TAPE. Mount latest D tape, and record in log book in computer room. DATA (and answer questions). If integrations are short or MULTRUN is in use, then just dump data to DISK and use FITSOUT to write data to tape at end of night. (Maximum of 60 full size CCD frames per tape)

• NORMAL OBSERVING CCDSPACE (to find out how much space is available on disk) PACKETS (for data to be kept) To change TV filter settings use:

  

  CHANGE (to change grating or anything else in IDS) RUN t ``NAME'' (or CORRE if using preflash and you have used this name for the procedure for t secs observation) MULTRUN n t ``NAME'' (for n observations of t secs each) KILLMULTRUN (if you want to stop MULTRUN for any reason) GLA t (glance, or MIRA if using preflash; stores data in temporary file R0) KEEP ``NAME'' (keeps the last GLANCE run) RUNSTAT (how long RUN has been going) DISP Rn (to display an earlier run, number n) If you want to keep the Grinnell image, ask the T.O. to ARCHIVE it for you. DISP An (to display an archived TV image)

• ON-LINE DATA REDUCTION SPECTRUM (for quick-look on-line analysis, just follow the instructions) Use temporary files T1, T2, etc to store output spectra in, then PLOT T1 and use default values for all plot parameters except Scale Factor, where values of 10-100 are likely to be needed. A plot appears on LEXIDATA. SPECPLOT T1 as PLOT, but gives wavelength scale and a cursor. When plot on LEXIDATA looks okay, use LEXPLOT to get a hardcopy of it on the Printronix. (N.B. LEXPLOT takes 40-45 secs and should not be attempted close to the end of a run as it doesn't like you to use LEXIDATA simultaneously).

• Useful Hints Use CuNe arc for H work, otherwise CuAr for red. This depends on dispersion, look at Appendix C. Check that your flux standards are calibrated for 8000. Look at Appendix A. F8 stars make good calibrators for removing atmospheric absorption bands for red spectra and are common.

• BIAS FRAMES. RUN 0 ``BIAS'' (5-10 times, when dark, for accurate estimation of bias)

• PREFLASH FRAMES (if needed) CORRE 0 ``PREFLASH'' produces a RUN with PREFLASH 40 units. SETFLASH 400 RUN 0 ``FLASHMAP'' produces a FLASH MAP of 400 units (convenient if your default value is 40 units) that you will scale to the used default value when reducing your data.

• COPYING DATA. Fill in Tape Copy Request Form and place in tray with D tape for Duty Officer to collect; do it every morning, do not wait until your final night. The C tapes will appear in the INT Visitors' pigeon hole. D.I.Y.: FITSINIT (INTD_) for first time use. FITSOUT (e.g. R1-R60) data is written to tape in International FITS standard since 16th January 1989; see Appendix B.