GMRT Exposure Time Calculator
(Continuum/Spectral Line)
In case of queries, please write to gmrtcalc[at]ncra.tifr.res.in.
Users are advised to run the ETC on the Firefox or Chrome browsers.
Problems have been noticed in some versions of Safari.
1
Observation Type
Continuum
Spectral Line
2
Observing Band
Band-2 (125-250 MHz)
Band-3 (260-500 MHz)
Band-4 (550-850 MHz)
Band-5 (980-1500 MHz)
3
MHz
GHz
4
Number of antennas
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
5
Bandwidth
400
200
100
50
25
12.5
6.25
3.125
1.5625
0.78125
0.390625
MHz
kHz
6
MHz
kHz
km/s
7
Number of Polarizations
2
1
8
Image weighting
Natural
Uniform
Robust
9
Source co-ordinates(J2000)
RA
Dec
10
Sky temperature (T_sky, K)
auto calculate
user defined
11
Calculation Type
On-Source Time
RMS noise
12
RMS noise
μJy/Bm
mJy/Bm
Jy/Bm
13
On-source Time
14
Fudge Factor
15
On-source Time including Fudge Factor
16
Overheads
auto calculate
user defined
17
Extra Bandpass/Polarization Time
18
Total Time (15+16+17)
19
Confusion Limit (σ_c*)
μJy/Bm