How to reduce a GRB data, obtained from TUG-RTT150 telescope

Introduction

    I will try to explain how to analyze a data obtained from TUG (TUBITAK NATIONAL OBSERVATORY) RTT-150 (1.5 m Russian-Turkish Telescope) with ANDOR CCD. I will try to create a standard procedure to calibrate the data and make aperture and diffrential photometry.
      

Some Information about the CCDs at the TUG

       TUG uses three different CCDs, one is named as Imaging CCD and it has a filter wheel so one can make observations using different filters nearly simultaneously. The second is a newer one ANDOR-CCD it has nearly the same properties as the Imaging CCD but does not yet have a filter wheel. The third is TFOSC (TUG Faint Object Spectrograph and Camera) it has not yet been used for normal observations but it is being hoped that it will start making observations very soon. In the table below you can find some basic information about the CCDs.


ANDOR - CCD
Imaging - CCD
TFOSC
Pixel Scale
0.26 arcsec / pixel
0.26 arcsec / pixel

Size
2048 x 2048
2048 x 2048
2048 x 2048
Field of view

9.1 arcmin x 9.1 arcmin

Read-Out Noise
3.0 e- rms@31kHz


Gain
1.5


Dark Current
1.7 e-/pix/hr

More Information
http://hea.iki.rssi.ru/AZT22/ENG/focal.htm http://www.tug.tubitak.gov.tr/aletler/SDSU_imaging_ccd/ccd.html?tr
http://www.tug.tubitak.gov.tr/aletler/TFOSC/TFOSC.html?tr
More information about TFOSC when it starts working normally

        In the table below you can find information about the filters that can be used with the CCDs above at TUG.

Color
Band (nm)
FWHM (nm)
CCD
U
340 - 380

Imaging - CCD
B
390 - 490

Imaging - CCD
V
510 - 590

Imaging - CCD
R
595 - 805

Imaging - CCD
I
770 - 990

Imaging - CCD
Wing 1
712
6
Imaging - CCD
Wing 2
754
5
Imaging - CCD
Wing 3
781
4
Imaging - CCD
Wing 4
812
5
Imaging - CCD
Wing 5
1035
10
Imaging - CCD
Wing 6
1056
10
Imaging - CCD
H-Alpha
656.3
8
Imaging - CCD
H-Alpha cont.
645

Imaging - CCD
O-III
500.7

Imaging - CCD
N-II
658.3

Imaging - CCD
S-II
673

Imaging - CCD
S-II cont.
696.4

Imaging - CCD
U
340 - 380

ANDOR - CCD
B
390 - 490

ANDOR - CCD
V
510 - 590

ANDOR - CCD
R
595 - 805

ANDOR - CCD
I
770 - 990

ANDOR - CCD

In the table below i will try to present you a typical header of a fits file coming from TUG.

Parameter
Information
ST
Siderial Time
RA
Right Ascension
DEC
Declination
BZERO
Offset data range to that of unsigned short
BSCALE
Default Scaling Factor
INSTRUME
Name of the Instrument used
TIME-OBS
Observation Start Time
DATE-OBS
Obervation Start Date
IMGRECT
Image Format
HBIN
Horizontal Binning
VBIN
Vertical Binning
SUBRECT
Subimage format
JD
Julian Data
AIRMASS
Air Mass aka sec(z)
EXPTIME
Exposure Time
TEMP
CCD Temperature
READTIME
Pixel readout time
FILTER
Filter in use
IMAGETYP
Image Type

These parameters are important since they will be used for data analysis using IRAF.

 


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