README web version of /home/usg/OPS/MTS/readme_xml/readme_78053700
Principal Investigator Email Address
Estimated Total Execution Time (hours, including overheads)
General Description
We will use FORS2 in long slit spectroscopy mode with standard resolution
to obtain intermediate resolution spectra of two radio sources over a large spectral
range. We will use three grisms to cover the range and will interleave the exposures
to mimic simultaneous observations. Our aim is to achieve good S/N over the entire
SED to enable us to accurately model and subtract the continuum. This is essential
for our main science goal which requires accurate modelling key diagnostic emission
lines, some of which (e.g. [S II 4068], [O II] 7318,7319,7330,7331) have small equivalent
widths.
We have 2 main targets, each of which have a special calibration OB which must be
executed immediately before or after the target OB. In addtion, we require a MINIMUM
of 3 spectrophotometric standards with the same setup for all 3 grisms used to be
observed. At least one of our specified standard star OBs should be executed on
each night the targets are observed, the third standard can be observed on either
night - it does not matter which order the flux standard stars are observed in.
We have specified OBs for 3 standards but we would also like any other spectrophotometric
standards observed on the same night(s) as the targets with the same setup.
We request the standard calibrations (biases, flats, arcs, spectrophotometric standard
stars) for our setup. We also have object specific calibration OBs, one for each
target, which MUST be executed immediately before or after the corresponding target
OB. In addition to the standard calibration spectrophotometric flux standards, we
have also specified OBs within our time allocation for 3 extra standard stars.
We have been granted 2 waivers for this program: 1 for the length of the OBs, 1
for intervention of the support astronomer at the telescope to set the PA for the
two main science targets.
Waiver Requests
We requested a waiver for the length of 2 OBs (PKS1345+12_sw1p3 and PKS1549-79_sw1p3
are both 3hrs 25min long) and this was granted: 78.B-0537A.01.WAV
The waiver states that, if the conditions degrade in violation of the constraints
after the 1st hour of an OB, the OB will not be interrupted and will not be repeated.
We have requested a second waiver for support astronomer intervention in the 2 long
OBs before execution (PKS1345+12_sw1p3 and PKS1549-79_sw1p3) and this was granted:
78.B-0537A.02
For these OBs we require the support astronomer to set the slit PA to the parallactic
angle at the CENTRE of these 2 OBs (i.e. 1.75 hours after the start of the OB) to
minimise slit losses. See 'Special Execution Requirements' in this README for more
information.
Critical Observing Condition Constraints
The OBs are long and we have been granted a waiver for this. The waiver
condition is that after the 1st hour, the OBs will not be stopped or repeated if
conditions become much worse than the requested conditions. To ensure we get good
quality data, we would like the service observer to only start the OBs if there
is a strong chance the conditions will not degrade significantly.
Time-Critical Aspects
Special Execution Requirements
We have requested extra time for Special Calibrations:
PKS1345+12_star_sw1p3 MUST BE executed immediately before or after PKS1345+12_sw1p3
PKS1549-79_star_sw1p3 MUST BE executed immediately before or after PKS1549-79_sw1p3
We have not specified a slit PA in the OBs and we have been granted a waiver for
this.
Due to the airmass of the observations, these CAN NOT be specified in advance and
MUST be set by the service observer.
PKS1549-79_sw1p3: set the PA to the parallactic angle at the midpoint of the OB
(i.e. approx 1hr 45 min after the start of the OB)
PKS1345+12_sw1p3: if PKS1345+12 will be at zenith distance < 45 degrees for >95%
of the OB running time (i.e. in the region which can be corrected by the LADC),
set PA 160 (on sky, so PA -160 on FORS2), otherwise set the PA to the parallactic
angle at the midpoint of the OB (i.e. approx 1hr 45 min after the start of the OB)
Special Calibration Information
We have requested extra time for Special Calibrations.
PKS1345+12_star_sw1p3 MUST BE executed immediately before or after PKS1345+12_sw1p3
PKS1549-79_star_sw1p3 MUST BE executed immediately before or after PKS1549-79_sw1p3
In addition, at least 3 spectrophotometric standard stars must be observed with
the same set up and for all three grisms used on each night the main targets (PKS
1345+12 and PKS 1549-79) are observed. We have specified OBs for 3 standards taken
from ESO's list of spectrophotometric standards - we have therefore not made finding
charts for these OBs. In addition, we request that any other spectrophotometric
standards observed on the same night with the same setup are made available to us.
We have input the code 9999 for the PA for the calibration OBs to trigger the parallactic
at the start of the OB.
ToO Information
ToO Activators List
Is this a Pre-imaging run ?
Pre-imaging Requirements
Source(s) of Pre-imaging
Pre-imaging sources not listed above
Do all your OBs comply with the instrument-specific requirements listed
on the instrument-specific Phase 2 web page ?
If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
Category for each Observing Template ?
Do all your finding charts comply with both the general and instrument-specific
Phase 2 Web Pages ?
If you submitted OBs for standard stars, did you specify the magnitude
and spectral type of all standard stars in the OBs ?
Have you included OBs for any calibrations that you need but which are
not part of the Calibration Plan ?
If you are observing Moving Targets, have you attached suitable ephemeris
files to your OBs?
If you have preferences which OBs should be executed first, did you make
use of the User Priority field in the OBs ?
If this is a run that requires coordinated observations with other facilities,
did you give proper instructions in the Time-Critical Aspects Section ?
If you have prepared your finding charts with tools other than FIMS,
do they comply with the specifications on the FORS1 Phase 2 web page ?
Last creation of page: Tue Oct 6 15:40:16 2009
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