La Silla Observatory



NTT Technical Time
2002-12-14 to 17

(Number to be confirmed)

Prepared C.Foellmi 2002-12-20

Revision History

2002-12-20 cfoellmi
1.0 2002-12-21 formatted, ohainaut



This short technical report summarizes the activities that took place during Tech.Time at NTT, on the nights of Dec.14-17, 2002.

1.2 - General remarks

Hola todos, Finally, finally! here you have the technical report of the 4 technical nights. To make it simply: there was MANY different setups for EMMI and SOFI, and, lucky guys, we had 3 photometric nights. We also had a problem with CALOB (missing header keyword, problem report open), and a few little misconfigurations. It took 3 nights to organize all the files...

Here is the report, following the mails from Ela and Malvina. 1.

2- Nada

No section 2


3.1.- Night time observations:

1.a-spectrophotometric standard stars observations with grisms 2,4,7

(watch out: the exposure times might still be too big, check the spectra), bin 2 x 2 Done. 3 Std stars.

1.b- Spectrophotometric standards with gratings 6,7 at blaze wavelength

Done. 4 Std stars. ( [Grat #6, 550nm, slit 5.0, bin2], [Grat#7, 600nm, slit 5.0, bin2] ) - night 1
Done. 3 Std stars ( [Grat #6, 550nm, slit 5.0, bin2], [Grat#7, 600nm, slit 5.0, bin2] ) - night 2

2-spectrophotometric standards with all blue gratings

Done. 3 Std stars with Grat. #11, and #12. + 3 Std stars with #5 and #3

3-Landolt field for blue AND red arms

(ideal would be five fields at different airmasses)

Done. 4 Std stars with Filters U#602, B#603 (BIMG), and Filters R#608, I#610 (RILD) (night 2)
Done. 5 Std stars with Filters U#602, B#603 (BIMG), and Filters V#606, R#608, I#610, r#773, i#774 and Bb#605 (night 3)

4-Spectroscopic sky flat with 1" slit

with all the set-ups you can manage: this is useful to determine the slit illumination function

Done. Grisms #1, #2, #6, #4, #7 (night 1)
Done. Grisms #3, #5 (night 3)
Done. Grating #7 [600 nm, bin 1]

5-Test of the template

rotate_to_slit , does it work? Extensive tests with Paul. Now it works fine. Paul even said that "since it works well for 2 stars, I can now make a RotateToSlit for 3 stars"...

6-Observations of a standard star with different positions on the CCD along the DISPERSION DIRECTION (y axis).

The offset should be: -150", 72", 78", 78", 72"
To do the trick, use a focus sequence, with 5 positions and focus offset=0

That was tricky. We got the image, but not further tests were made (don't know if the MOS on EMMI works).

7- Observations of empty fields (the catalog is in the TCS)

with I and R filters, ~15-25 exposures each, with jitter---> fringing pattern

Done. 2 fields, with I and R filters.

3.2- Daytime

Spectroscopic dome flats with all the set-up used.

Beside being used for calibration, I would like to check the amount of contamination from sunlight (the dome looks pretty dark to me, but an observer has complained about it...)

Done with the calibration of the files above.

Test of instrument flexures

(if it is possible, last time there was still some problem pending). Not done. But I saw a mail from Paul a few minutes ago saying that he did it...

Linearity test for red arm

Done. See in the TechDec02 (EMMI) directory.

Extract the ThAr lamp from the sphere and check if you can see inside the socket which color it's painted.

Not sure that it's done... I have no idea the color it is. Duncan said that it should be black...

Calibrations for the observed set-ups

Ha ha ha... Before continuing, let me just mention that with the program above, thanks! for the photometric conditions, there is 27 different setups... [Take a breath, think about it 2 seconds, and get a drink.] This is not counting with the program of SOFI, and the service... (and not mentionning again the bloody problem with calob which messed all up). This had strong consequences for the SOFI program, since it took so much time to make the calibrations of EMMI, that not all calibrations for SOFI are available.

3.3- References and data

The directory /data/NTTOPS/NttTeamTech/Emmi/TechDec02/ is organized by nights.

-- night 1 --

(grisms 1,2,6,4,7) [BIAS ==> OK]

(Grating #11, 350 nm, slit 5.0, bin 1) [BIAS, ARCS, FLATS ==> OK]
(Grating #12, 350 nm, slit 5.0, bin 1) [BIAS, ARCS, FLATS ==> OK]

(Grat #6, 550 nm, slit 5.0, bin 2) [BIAS, ARCS, FLATS ==> OK]
(Grat #7, 600 nm, slit 5.0, bin 2) [BIAS, ARCS, FLATS ==> OK]

(Grisms 2,4,7, bin 2) [ARCS, BIAS, FLATS ==> OK]
HERE there was the problem with the missing header keyword (the slit name) with CALOB. Be careful with the data, and the arcs!!

-- night 2 --

(RILD, bin 1, Filters R#608, I#610) [BIAS, FLATS ==> OK]

(BIMG, bin 2, Filters U#602, B#603) [BIAS, FLATS ==> OK]
(RILD, bin 2, Filters R#608, I#610) [BIAS, FLATS ==> OK]

(Grat #11, bin 1, 350 nm, slit 1.0) [BIAS ==> OK, ARCS with slit 5.0, FLATS with slit 5.0]
(Grat #12, bin1, 350 nm, slit 1.0) [BIAS, FLATS ==> OK, ARCS with slit 5.0]

(Grat #6, 550 nm, bin 2, slit 5.0) [BIAS, ARCS, FLATS ==> OK]
(Grat #7, 600 nm, bin 2, slit 5.0) [BIAS, ARCS, FLATS ==> OK]

-- night 3 --

(BIMG, bin2, Filters U#602, B#603) [BIAS, FLATS ==> OK]
(RILD, bin2, Filters V#606, R#608, I#610, r#773, i#774, Bb#605)

(RILD, Grisms #3, #5, bin 1, slit 1.0) [BIAS ==> OK]
(REMD, Grating #7, 600 nm, bin 1, slit 1.0) [BIAS ==> OK]

(Grat #3, 380 nm, slit 5.0, bin 1) [BIAS, ARCS, FLATS ==> OK]
(Grat #5, 370 nm, slit 5.0, bin 1) [BIAS, ARCS ==> OK, FLATS with slit 1.0]
(Grat #3, 380 nm, slit 1.0, bin 1) [BIAS, FLATS ==> OK, ARCS with slit 5.0]
(Grat #5, 370 nm, slit 1.0, bin 1) [BIAS, FLATS ==> OK, ARCS with slit 5.0]

-- night 4 --

Nothing in EMMI, was not photometric anyway, clouds at the end of the night.


4.1- Imaging

1- Illumination correction in Spectroscopic Objective mode in J, H and Ks.

(for a service mode program!) Done. 3 stars (2 times the same one at different airmass).

2- Illumination correction in Small Field mode in J,H, Ks

Done. 3 Std stars.

3- Zero points in Small Field mode in J, H and Ks

(at least 4 standard stars): Done, 5 Std stars.

4- Zero points in Spectroscopic objectvive mode in J, H and Ks

Done. 5 Std stars.

5- Zero points in Large Field in Z filter

Done 5 Std stars.

4.2- Spectroscopy

6-Zero points with the 1" slit for Blue grism, red grism, HR+ Ks filter, HR+H filter.

Done. 5 Std stars.

4.3- References and Files

The directory /data/NTTOPS/NttTeamTech/SofI/TechDec02/ is NOT organized by nights.

-- Illum_Corr_SF_JHKs
(Small Field, JHKs) [FLATS: with filter H only, and taken from the following observer, and it seems that they are not correct, SO instead of SF]

-- Illum_Corr_SO_JHKs
(Spectroscopic Objective, JHKs) [FLATS JHKs ==> OK]

-- Zero_Point_LF_Z
(Large Field, filter Z) [FLATS Z ==> OK]

-- Zero_Point_SO_JHKs
(Spectroscopic Objective, JHKs) [FLATS JHKs ==> OK]

-- Zero_Point_SF_JHKs
(Small Field, JHKs) [FLATS = none!!]

-- Zero_Point_spectro/
(Spectroscopy, Blue grism, Red grism, blablabla) [FLATS = none!!]

5.- Others

4 Std stars and 2 frames for the programme of Guzzo. (night - 2)
5 Std stars and 2 frames for the programme of Natta. (night - 3)
None of the programs are completed, but close to it.
Other: A few frames for me, a few frames for Dominique.

6- Concluding remarks

I think that's it. I must say that without the help of Dominique, who managed a few important parts of this program to the addition of constant support and checks, it would have certainly not possible. And for all the setups (!!) and calibrations done although it was a mess because of CALOB, you'll have chocolate and cerveza, Jorge! I promise!

1. I will not make the CDs. Anyway, Ela is coming up soon, and I'll be there with Malvina soon in January.
2. I hope to have not forgot something. Never sure...
3. Ela, I sware, I also tried to get these echelle throughputs, but at that time I only increased my knowledge of echelle spectra....

If I don't see you all before the end of the year, Merry Christmas, Feliz Navidad, and toute cette sorte de choses... Cedric - going to vacations for a while...