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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
185.5692 -47.9604 0.0502 4.0 116.2 0.0461 3.8 TRIG_00544381
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.728 -9.728 (delta_t = 51.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.978771 ( -1.24704 1.06059 )
Norm@50keV : 1.29712E-03 ( -0.00129662 0.00155036 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9686 for 57 degrees of freedom
# Null hypothesis probability = 5.425842e-01
Photon flux (15-150 keV) in 1.024 sec: 0.198092 ( -0.126417 0.210888 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58049e-08 ( -2.23358e-08 2.68765e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.915004 ( -2.27932 0.986335 )
Epeak [keV] : 9999.36 ( -9999.64 -9999.64 )
Norm@50keV : 1.42455E-03 ( -0.000453468 0.0135995 )
------------------------------------------------------------
# Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 0.9863 for 56 degrees of freedom
# Null hypothesis probability = 5.039664e-01
Photon flux (15-150 keV) in 1.024 sec: 0.182158 ( -0.114922 0.225976 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61882e-07 ( -5.61882e-07 7.26105e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.201536 ( -0.201941 -0.201941 )
beta : 0.979085 ( -1.06073 1.24664 )
Epeak [keV] : 16.4730 ( -16.4709 -16.4709 )
Norm@50keV : 2.50013E-03 ( -0.00249994 527.634 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.667540e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.2491 ( )
R^2/D10^2 : 4.68690E-04 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 0.9815 for 57 degrees of freedom
# Null hypothesis probability = 5.146030e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.987e-10 6.282e-10
25- 50 1.116e-10 1.043e-10
50-150 1.234e-13 7.311e-14
15-150 1.010e-09 5.253e-10
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 ( )
Norm : 0.776313 (-0.565694 0.568387)
------------------------------------------------------------
# Chi-Squared = 74.19 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.262994e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.760e-10 9.021e-10
25- 50 1.703e-10 1.083e-10
50-150 2.254e-12 6.615e-12
15-150 1.048e-09 7.982e-10
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.12886 (-2.07201 15.0756)
R1^2/D10^2 : 36.4700 ( )
kT2 [keV] : 197.013 (-125.272 -125.272)
R2^2/D10^2 : 1.72364E-04 (-5.61555e-05 0.00138848)
------------------------------------------------------------
# Chi-Squared = 55.15 using 59 PHA bins.
# Chi-Squared = 55.13 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.688797e-01
# Null hypothesis probability = 4.696345e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.687e-10 1.256e-10
25- 50 1.907e-09 6.523e-10
50-150 4.559e-08 1.643e-08
15-150 4.827e-08 1.975e-08
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.978771 ( -1.24704 1.06059 )
Norm@50keV : 1.29712E-03 ( -0.00129662 0.00155036 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9686 for 57 degrees of freedom
# Null hypothesis probability = 5.425842e-01
Photon flux (15-150 keV) in 1.024 sec: 0.198092 ( -0.126417 0.210888 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58049e-08 ( -2.23358e-08 2.68765e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.915004 ( -2.27932 0.986335 )
Epeak [keV] : 9999.36 ( -9999.64 -9999.64 )
Norm@50keV : 1.42455E-03 ( -0.000453468 0.0136565 )
------------------------------------------------------------
# Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 0.9863 for 56 degrees of freedom
# Null hypothesis probability = 5.039664e-01
Photon flux (15-150 keV) in 1.024 sec: 0.182158 ( -0.114922 0.225976 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61882e-07 ( -5.61882e-07 7.26105e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.201536 ( -0.201941 -0.201941 )
beta : 0.979085 ( -1.06073 1.24664 )
Epeak [keV] : 16.4730 ( -16.4709 -16.4709 )
Norm@50keV : 2.50013E-03 ( -0.00249994 527.634 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.667540e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.2491 ( )
R^2/D10^2 : 4.68690E-04 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 0.9815 for 57 degrees of freedom
# Null hypothesis probability = 5.146030e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.987e-10 4.324e-10
25- 50 1.116e-10 8.556e-11
50-150 1.234e-13 2.429e-14
15-150 1.010e-09 4.539e-10
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 ( )
Norm : 0.776313 (-0.565694 0.568387)
------------------------------------------------------------
# Chi-Squared = 74.19 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.262994e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.760e-10 2.961e-10
25- 50 1.703e-10 1.524e-10
50-150 2.254e-12 1.617e-12
15-150 1.048e-09 7.071e-10
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.12886 (-2.07201 15.0756)
R1^2/D10^2 : 36.4700 ( )
kT2 [keV] : 197.013 (-125.272 -125.272)
R2^2/D10^2 : 1.72364E-04 (-5.61555e-05 0.00138848)
------------------------------------------------------------
# Chi-Squared = 55.15 using 59 PHA bins.
# Chi-Squared = 55.13 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.688797e-01
# Null hypothesis probability = 4.696345e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.687e-10 1.338e-10
25- 50 1.907e-09 7.675e-10
50-150 4.559e-08 1.948e-08
15-150 4.827e-08 1.718e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.978771 ( -1.24704 1.06059 )
Norm@50keV : 1.29712E-03 ( -0.00129662 0.00155036 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9686 for 57 degrees of freedom
# Null hypothesis probability = 5.425842e-01
Photon flux (15-150 keV) in 1.024 sec: 0.198092 ( -0.126417 0.210888 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58049e-08 ( -2.23358e-08 2.68765e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.915004 ( -2.27932 0.986335 )
Epeak [keV] : 9999.36 ( -9999.64 -9999.64 )
Norm@50keV : 1.42455E-03 ( )
------------------------------------------------------------
# Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 0.9862 for 56 degrees of freedom
# Null hypothesis probability = 5.039866e-01
Photon flux (15-150 keV) in 1.024 sec: 0.182158 ( -0.114922 0.225976 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61882e-07 ( -5.61882e-07 7.26105e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.201536 ( -0.201941 -0.201941 )
beta : 0.979085 ( -1.06073 1.24664 )
Epeak [keV] : 16.4730 ( -16.4709 -16.4709 )
Norm@50keV : 2.50013E-03 ( -0.00249994 527.634 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.667540e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 5.38214e-10
S(50-100 keV) = 7.2449e-09
T90 vs. Hardness ratio plot
T90 = 1.02399998903275 sec.
Hardness ratio (energy fluence ratio) = 13.461
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.642899
Count Ratio (50-100 keV) / (15-25 keV) = 7.27254
Mask shadow pattern
IMX = -3.062937826007240E-02, IMY = -6.236837735495993E-02
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-60.728000 -9.728000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5933 -40.3983 3.4 38.6 69.6 1.3370 3.4 9.8 Vela X-1
170.6290 -60.6479 7.8 14.8 25.9 0.1649 1.5 9.3 Cen X-3
186.3735 -62.8878 577.5 12.4 -6.0 -0.0024 -0.0 10.5 GX 301-2
126.3984 -45.0742 2.3 41.8 57.9 2.1699 4.9 ------ UNKNOWN
194.8319 -19.4727 2.5 31.4 174.6 0.6174 4.6 ------ UNKNOWN
21.5564 -71.9367 2.6 57.2 -9.8 2.1702 4.4 ------ UNKNOWN
296.3218 -65.8391 2.7 50.8 -44.5 2.4912 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 1.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5485 -40.4342 5.1 38.6 69.6 0.0963 2.3 7.3 Vela X-1
170.3607 -60.8104 12.7 15.0 25.6 -0.0113 -0.9 11.3 Cen X-3
186.8687 -62.9556 0.0 12.5 -7.1 0.0225 1.9 12.5 GX 301-2
126.1610 -55.7728 2.4 37.3 42.6 0.1185 4.8 ------ UNKNOWN
185.5691 -47.9603 3.0 4.0 116.2 0.0460 3.8 ------ UNKNOWN
252.6717 -79.8212 2.1 35.7 -29.6 0.0884 5.3 ------ UNKNOWN
294.9921 -65.6387 2.6 50.4 -45.1 0.2723 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
33.372600 71.822000
73.272000 122.452000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3211 -40.4975 9.9 36.1 64.6 1.8859 1.2 10.1 Vela X-1
170.2941 -60.7703 11.6 15.5 10.4 -0.5844 -1.0 8.9 Cen X-3
187.0607 -62.6692 0.0 14.8 -21.0 -0.9066 -1.4 12.7 GX 301-2
111.6419 -66.7918 3.3 40.9 17.1 3.6679 3.5 ------ UNKNOWN
66.6251 -68.2613 2.4 55.3 5.1 11.8935 4.7 ------ UNKNOWN
235.5742 -37.6308 3.2 37.5 -105.2 5.8368 3.6 ------ UNKNOWN
260.6025 -58.8719 2.6 43.6 -64.6 10.2086 4.4 ------ UNKNOWN
Plot creation:
Sun Dec 30 11:00:30 EST 2012