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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
112.2210 -27.2282 0.0179 36.8587 -95.7660 1.0635654 10.736 TRIG_00222546
Foreground time interval of the image:
-14.060 5.548 (delta_t = 19.608 [sec])
Background time interval of the image:
-239.184 -14.060 (delta_t = 225.124 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -14.060 sec. to 5.548 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78325 ( -0.261404 0.272508 )
Norm@50keV : 2.94996E-03 ( -0.000526281 0.000514602 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.78 using 59 PHA bins.
# Reduced chi-squared = 1.470 for 57 degrees of freedom
# Null hypothesis probability = 1.199791e-02
Photon flux (15-150 keV) in 19.61 sec: 0.403890 ( -0.0626358 0.0626643 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.3291e-07 ( -9.5606e-08 9.79459e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.060 sec. to 5.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.160841 ( -3.34679 1.87925 )
Epeak [keV] : 43.5947 ( -9.18959 -43.4 )
Norm@50keV : 2.84761E-02 ( -0.0305264 3.65834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.79 using 59 PHA bins.
# Reduced chi-squared = 1.460 for 56 degrees of freedom
# Null hypothesis probability = 1.389991e-02
Photon flux (15-150 keV) in 19.61 sec: 0.381928 ( -0.068013 0.068883 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.3664e-07 ( -1.07227e-07 1.49901e-07 ) ergs/cm2
Band function
Time interval is from -14.060 sec. to 5.548 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.96465 ( -2.40664 -1.35559 )
beta : -2.49949 ( -1.62345 0.643751 )
Epeak [keV] : 35.1236 ( -10.8864 14.1841 )
Norm@50keV : 0.782346 ( -0.791038 48.9609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.04 using 59 PHA bins.
# Reduced chi-squared = 1.419 for 55 degrees of freedom
# Null hypothesis probability = 2.222265e-02
Photon flux (15-150 keV) in 19.61 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.81143e-07 ( -4.81006e-07 -1.03213e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0210 (-1.42899 1.74516)
R^2/D10^2 : 0.198603 (-0.0916727 0.158632)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.80 using 59 PHA bins.
# Reduced chi-squared = 1.453 for 57 degrees of freedom
# Null hypothesis probability = 1.441784e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.971e-08 2.512e-08
25- 50 1.988e-07 3.912e-08
50-150 1.044e-07 4.253e-08
15-150 3.828e-07 8.854e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 89.1851 (-36.3876 99.2879)
Norm : 1.85858 (-0.379292 0.505728)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.52 using 59 PHA bins.
# Reduced chi-squared = 1.448 for 57 degrees of freedom
# Null hypothesis probability = 1.517617e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.507e-08 2.036e-08
25- 50 1.605e-07 3.573e-08
50-150 2.430e-07 1.327e-07
15-150 4.985e-07 1.817e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.91733 (-1.35202 1.31807)
R1^2/D10^2 : 0.284986 (-0.131959 0.238266)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 3.27507E-05 (-1.86348e-05 0.000821892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.80 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 55 degrees of freedom
# Null hypothesis probability = 4.612921e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.693e-08 2.911e-08
25- 50 1.874e-07 6.477e-08
50-150 2.369e-07 5.319e-08
15-150 5.112e-07 1.443e-07
Peak spectrum fit
Power-law model
Time interval is from 4.516 sec. to 5.516 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44713 ( -0.480431 0.485558 )
Norm@50keV : 9.29589E-03 ( -0.00225614 0.00222659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.340790e-01
Photon flux (15-150 keV) in 1 sec: 1.14478 ( -0.285754 0.286149 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.90038e-08 ( -2.36837e-08 2.38051e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.516 sec. to 5.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44640 ( -0.724599 0.458766 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 9.32451E-03 ( -0.00227095 -0.00932452 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.12 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 56 degrees of freedom
# Null hypothesis probability = 3.970214e-01
Photon flux (15-150 keV) in 1 sec: 1.14770 ( -0.28492 0.28284 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.8442e-08 ( -1.14374e-08 2.3584e-08 ) ergs/cm2
Band function
Time interval is from 4.516 sec. to 5.516 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17154 ( 1.17185 1.17185 )
beta : -1.44684 ( 1.44696 0.480365 )
Epeak [keV] : 33.4523 ( -33.2761 -33.2761 )
Norm@50keV : 1.85197E-02 ( -0.0114353 1.54755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.613871e-01
Photon flux (15-150 keV) in 1 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] : 17.0566 (-7.10976 15.4952)
R^2/D10^2 : 7.81566E-02 (-0.0658214 0.420676)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.06 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 57 degrees of freedom
# Null hypothesis probability = 1.314034e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.627e-09 2.945e-09
25- 50 2.053e-08 1.054e-08
50-150 4.268e-08 2.455e-08
15-150 6.783e-08 3.448e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-109.99 -199.363)
Norm : 4.68497 (-1.128 1.128)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.44 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.869379e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.167e-08 7.060e-09
25- 50 2.244e-08 1.318e-08
50-150 4.922e-08 2.883e-08
15-150 8.333e-08 4.923e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.42577 (-4.56066 4.87753)
R1^2/D10^2 : 1.20373 (-0.975761 2.74991)
kT2 [keV] : 66.3361 (-41.5729 -66.629)
R2^2/D10^2 : 1.29537E-03 (-0.00116042 0.0186629)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.00 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.004235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.179e-08 7.150e-09
25- 50 2.107e-08 1.154e-08
50-150 6.214e-08 3.347e-08
15-150 9.500e-08 4.622e-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: 1.78325 ( -0.261404 0.272508 )
Norm@50keV : 2.94996E-03 ( -0.000526281 0.000514602 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.78 using 59 PHA bins.
# Reduced chi-squared = 1.470 for 57 degrees of freedom
# Null hypothesis probability = 1.199791e-02
Photon flux (15-150 keV) in 19.61 sec: 0.403890 ( -0.0626358 0.0626643 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.3291e-07 ( -9.5606e-08 9.79459e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.160841 ( -3.34679 1.87925 )
Epeak [keV] : 43.5947 ( -9.18959 -43.4 )
Norm@50keV : 2.84761E-02 ( -0.0305264 3.65834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.79 using 59 PHA bins.
# Reduced chi-squared = 1.460 for 56 degrees of freedom
# Null hypothesis probability = 1.389991e-02
Photon flux (15-150 keV) in 19.61 sec: 0.381928 ( -0.068013 0.068883 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.3664e-07 ( -1.07227e-07 1.49901e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.96465 ( -2.40664 -1.35559 )
beta : -2.49949 ( -1.62345 0.643751 )
Epeak [keV] : 35.1236 ( -10.8864 14.1841 )
Norm@50keV : 0.782346 ( -0.791038 48.9609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.04 using 59 PHA bins.
# Reduced chi-squared = 1.419 for 55 degrees of freedom
# Null hypothesis probability = 2.222265e-02
Photon flux (15-150 keV) in 19.61 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.81143e-07 ( -4.81006e-07 -1.03213e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.49e-07
S(50-100 keV) = 1.73e-07
T90 vs. Hardness ratio plot
T90 = 18.188000023365 sec.
Hardness ratio (energy fluence ratio) = 1.16107
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.43256
Count Ratio (50-100 keV) / (15-25 keV) = 0.641396
Mask shadow pattern
IMX = -7.531924975437265E-02, IMY = 7.459008555131527E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-239.184000 -14.060000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6881 -40.4183 0.0 32.4 -54.6 -0.4311 -1.9 10.9 Vela X-1
170.4084 -60.4332 0.0 33.9 0.2 0.3408 1.6 11.7 Cen X-3
186.6436 -62.7760 1.1 38.4 11.5 2.3527 10.7 0.5 GX 301-2
54.3004 -15.6778 2.7 54.9 -171.9 2.1736 4.3 ------ UNKNOWN
85.9710 -29.8548 3.0 33.1 -136.3 0.7500 3.9 ------ UNKNOWN
152.4980 -36.5119 2.4 43.1 -40.5 1.3850 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.060000 5.548000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6881 -40.4183 0.0 32.4 -54.6 -0.0646 -1.2 10.9 Vela X-1
170.5673 -60.6862 10.1 33.8 0.7 0.0577 1.1 8.3 Cen X-3
186.5932 -62.8166 3.2 38.4 11.5 -0.2213 -3.6 3.3 GX 301-2
27.8413 -52.9671 2.0 35.5 132.2 0.4174 5.7 ------ UNKNOWN
34.9574 -24.9921 2.5 54.4 163.1 1.0966 4.6 ------ UNKNOWN
84.3353 -32.3936 2.5 30.8 -139.6 0.2204 4.7 ------ UNKNOWN
142.7621 -39.4300 2.3 36.3 -47.7 0.3181 5.1 ------ UNKNOWN
129.5661 -33.7468 1.9 35.8 -68.2 0.4316 6.0 ------ UNKNOWN
112.2210 -27.2282 1.1 36.9 -95.8 1.0636 10.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
105.516600 711.416610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6416 22.0186 0.9 56.5 -150.3 21.5909 12.9 0.5 Crab
135.6699 -40.7234 0.0 23.5 12.8 -0.3282 -1.2 12.0 Vela X-1
170.2851 -60.6064 25.4 51.0 29.4 0.6159 0.5 1.3 Cen X-3
93.6211 -57.9409 3.6 33.4 79.8 1.7703 3.3 ------ UNKNOWN
58.7458 -16.3769 3.3 50.4 152.6 4.9513 3.5 ------ UNKNOWN
179.0344 -42.3055 2.4 55.5 6.2 6.4424 4.9 ------ UNKNOWN
168.6260 -43.1820 2.3 47.8 6.7 2.8469 5.0 ------ UNKNOWN
Plot creation:
Sun May 31 12:26:19 EDT 2015