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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
72.6217 -72.5273 0.0080 17.3622 -81.3692 0.7818382 23.765 TRIG_00374598
Foreground time interval of the image:
-0.780 6.632 (delta_t = 7.412 [sec])
Background time interval of the image:
-239.584 -0.780 (delta_t = 238.804 [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 1.024000
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 1.024000
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 1.024000
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 -0.780 sec. to 6.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07922 ( -0.121793 0.119947 )
Norm@50keV : 6.72200E-03 ( -0.000454734 0.000454571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.55 using 59 PHA bins.
# Reduced chi-squared = 0.7114 for 57 degrees of freedom
# Null hypothesis probability = 9.511406e-01
Photon flux (15-150 keV) in 7.412 sec: 0.778214 ( -0.053654 0.0537061 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24415e-07 ( -3.99769e-08 4.02447e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.780 sec. to 6.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.926329 ( -0.506959 0.21287 )
Epeak [keV] : 375.339 ( -375.408 -375.408 )
Norm@50keV : 7.95777E-03 ( -0.00161933 0.00574543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.24 using 59 PHA bins.
# Reduced chi-squared = 0.7185 for 56 degrees of freedom
# Null hypothesis probability = 9.444286e-01
Photon flux (15-150 keV) in 7.412 sec: 0.773058 ( -0.055984 0.055624 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18612e-07 ( -4.4787e-08 4.3862e-08 ) ergs/cm2
Band function
Time interval is from -0.780 sec. to 6.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.29570E-03 ( 0.195254 0.195254 )
beta : -1.22874 ( 1.22796 0.210652 )
Epeak [keV] : 71.0154 ( -70.3424 257.89 )
Norm@50keV : 2.87796E-02 ( -0.0303549 81.0116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.16 using 59 PHA bins.
# Reduced chi-squared = 0.6939 for 55 degrees of freedom
# Null hypothesis probability = 9.591570e-01
Photon flux (15-150 keV) in 7.412 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] : 19.0407 (-1.77118 2.04401)
R^2/D10^2 : 4.25782E-02 (-0.011932 0.0159262)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.61 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.612812e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.247e-08 3.057e-09
25- 50 1.083e-07 1.030e-08
50-150 2.885e-07 3.862e-08
15-150 4.193e-07 3.632e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.15585 (-0.220639 0.220625)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.81 using 59 PHA bins.
# Reduced chi-squared = 1.400 for 57 degrees of freedom
# Null hypothesis probability = 2.474877e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.826e-08 4.866e-09
25- 50 1.121e-07 1.553e-08
50-150 2.458e-07 8.561e-08
15-150 4.161e-07 1.051e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.8016 ( )
R1^2/D10^2 : 0.150275 (-0.0490722 0.120041)
kT2 [keV] : 87.5258 (-48.0125 -87.5243)
R2^2/D10^2 : 5.05380E-04 (-0.000347968 0.00291571)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.10 using 59 PHA bins.
#Fit statistic : Chi-Squared = 35.49 using 59 PHA bins.
# Reduced chi-squared = 0.6927 for 55 degrees of freedom
# Reduced chi-squared = 0.6452 for 55 degrees of freedom
# Null hypothesis probability = 9.598418e-01
# Null hypothesis probability = 9.810386e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.649e-08 1.441e-08
25- 50 1.115e-07 3.387e-08
50-150 3.501e-07 1.677e-07
15-150 4.981e-07 2.085e-07
Peak spectrum fit
Power-law model
Time interval is from -0.256 sec. to 0.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05757 ( -0.187243 0.183376 )
Norm@50keV : 1.23515E-02 ( -0.00131697 0.00131692 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.54 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.073420e-01
Photon flux (15-150 keV) in 1 sec: 1.42739 ( -0.153238 0.153318 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3094e-07 ( -1.6111e-08 1.63096e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.256 sec. to 0.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.721329 ( -0.8026 0.428887 )
Epeak [keV] : 197.292 ( -197.38 -197.38 )
Norm@50keV : 1.80932E-02 ( -0.00723223 0.0256789 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.85 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 56 degrees of freedom
# Null hypothesis probability = 1.010006e-01
Photon flux (15-150 keV) in 1 sec: 1.40830 ( -0.15878 0.15816 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27268e-07 ( -1.8316e-08 1.7992e-08 ) ergs/cm2
Band function
Time interval is from -0.256 sec. to 0.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.35604 -5 )
beta : -1.17857 ( -0.227259 0.218022 )
Epeak [keV] : 28.5239 ( -9.55174 22.094 )
Norm@50keV : 428.230 ( -45.3746 4115.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.57 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 55 degrees of freedom
# Null hypothesis probability = 1.188792e-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] : 18.6995 (-2.66948 3.33054)
R^2/D10^2 : 8.35100E-02 (-0.0339361 0.0538771)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.85 using 59 PHA bins.
# Reduced chi-squared = 1.471 for 57 degrees of freedom
# Null hypothesis probability = 1.183537e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.772e-09 1.237e-09
25- 50 2.745e-08 4.695e-09
50-150 7.031e-08 1.445e-08
15-150 1.035e-07 1.717e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.61003 (-0.625896 0.625896)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.46 using 59 PHA bins.
# Reduced chi-squared = 1.534 for 57 degrees of freedom
# Null hypothesis probability = 5.851134e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.406e-08 7.765e-09
25- 50 2.705e-08 1.484e-08
50-150 5.933e-08 3.268e-08
15-150 1.004e-07 5.510e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.94708 (-3.38561 3.97823)
R1^2/D10^2 : 0.406443 (-0.237466 0.864737)
kT2 [keV] : 42.8123 (-17.7473 -43.4074)
R2^2/D10^2 : 5.03132E-03 (-0.00476782 0.0209034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.16 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.095751e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.308e-09 4.685e-09
25- 50 2.805e-08 1.381e-08
50-150 9.198e-08 4.953e-08
15-150 1.293e-07 6.365e-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: 1.07922 ( -0.121793 0.119947 )
Norm@50keV : 6.72200E-03 ( -0.000454734 0.000454571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.55 using 59 PHA bins.
# Reduced chi-squared = 0.7114 for 57 degrees of freedom
# Null hypothesis probability = 9.511406e-01
Photon flux (15-150 keV) in 7.412 sec: 0.778214 ( -0.053654 0.0537061 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24415e-07 ( -3.99769e-08 4.02447e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.926329 ( -0.506959 0.21287 )
Epeak [keV] : 375.339 ( -375.408 -375.408 )
Norm@50keV : 7.95777E-03 ( -0.00161933 0.00574543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.24 using 59 PHA bins.
# Reduced chi-squared = 0.7185 for 56 degrees of freedom
# Null hypothesis probability = 9.444286e-01
Photon flux (15-150 keV) in 7.412 sec: 0.773058 ( -0.055984 0.055624 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18612e-07 ( -4.4787e-08 4.3862e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.29570E-03 ( 0.195254 0.195254 )
beta : -1.22874 ( 1.22796 0.210652 )
Epeak [keV] : 71.0154 ( -70.3424 257.938 )
Norm@50keV : 2.87796E-02 ( -0.0303549 81.0309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.16 using 59 PHA bins.
# Reduced chi-squared = 0.6939 for 55 degrees of freedom
# Null hypothesis probability = 9.591570e-01
Photon flux (15-150 keV) in 7.412 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) = 1.02e-07
S(50-100 keV) = 1.94e-07
T90 vs. Hardness ratio plot
T90 = 6.6479999423027 sec.
Hardness ratio (energy fluence ratio) = 1.90196
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.84349
Count Ratio (50-100 keV) / (15-25 keV) = 1.62673
Mask shadow pattern
IMX = 4.691906941692836E-02, IMY = 3.091151598307949E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-239.584000 -0.780000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6842 -40.5432 5.0 49.8 -143.1 1.3426 2.3 7.1 Vela X-1
336.4722 -44.3801 2.3 51.4 -3.5 2.2221 5.1 ------ UNKNOWN
320.8355 -54.9312 2.3 51.2 -22.2 2.3076 5.0 ------ UNKNOWN
270.4519 -78.2937 3.8 44.5 -60.4 2.8168 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.780000 6.632000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4026 -40.6125 1293.1 49.6 -143.3 -0.0009 -0.0 6.7 Vela X-1
72.6217 -72.5273 0.5 17.4 -81.4 0.7817 23.7 ------ UNKNOWN
95.2771 -65.5434 2.5 19.3 -114.9 0.1401 4.5 ------ UNKNOWN
323.7758 -78.3246 2.4 37.0 -49.3 0.2449 4.8 ------ UNKNOWN
302.7155 -57.6242 2.4 55.8 -33.8 0.7918 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
276.716600 832.916600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
144.6345 14.6371 2.3 44.1 7.7 2.7346 5.1 ------ UNKNOWN
Plot creation:
Sun May 31 02:41:44 EDT 2015