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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.0576 32.1471 0.0075 50.8232 -153.9835 3.7137945 25.659 TRIG_00621915
Foreground time interval of the image:
-0.908 7.296 (delta_t = 8.204 [sec])
Background time interval of the image:
-294.499 -276.524 (delta_t = 17.976 [sec])
-239.600 -0.908 (delta_t = 238.692 [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 -0.908 sec. to 7.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30359 ( -0.0832992 0.0826502 )
Norm@50keV : 3.21766E-02 ( -0.00163143 0.0016301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.41 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.333203e-01
Photon flux (15-150 keV) in 8.204 sec: 3.84131 ( -0.210489 0.211076 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60629e-06 ( -1.35448e-07 1.35555e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.908 sec. to 7.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.614705 ( -0.399138 0.366231 )
Epeak [keV] : 116.099 ( -22.8863 64.6698 )
Norm@50keV : 6.52678E-02 ( -0.0200062 0.0315427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.42 using 59 PHA bins.
# Reduced chi-squared = 0.9539 for 56 degrees of freedom
# Null hypothesis probability = 5.731293e-01
Photon flux (15-150 keV) in 8.204 sec: 3.73320 ( -0.217 0.21804 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55911e-06 ( -1.4069e-07 1.40141e-07 ) ergs/cm2
Band function
Time interval is from -0.908 sec. to 7.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.387045 ( -0.554434 0.960196 )
beta : -1.73573 ( 1.73385 0.286434 )
Epeak [keV] : 93.5213 ( -35.2339 74.0932 )
Norm@50keV : 8.67736E-02 ( -0.0399121 0.232568 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9609 for 55 degrees of freedom
# Null hypothesis probability = 5.573080e-01
Photon flux (15-150 keV) in 8.204 sec: 3.70838 ( 3.29162 -0.22151 ) 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] : 19.1525 (-1.09824 1.1859)
R^2/D10^2 : 0.204961 (-0.0387098 0.0467393)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.47 using 59 PHA bins.
# Reduced chi-squared = 1.8152 for 57 degrees of freedom
# Null hypothesis probability = 1.638506e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.209e-07 1.235e-08
25- 50 5.847e-07 4.172e-08
50-150 1.579e-06 1.251e-07
15-150 2.284e-06 1.251e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 16.4496 (-0.835875 0.835574)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.49 using 59 PHA bins.
# Reduced chi-squared = 1.535 for 57 degrees of freedom
# Null hypothesis probability = 5.818901e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.360e-07 2.010e-08
25- 50 6.463e-07 3.848e-08
50-150 1.418e-06 8.450e-08
15-150 2.400e-06 1.395e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.34245 (-2.6556 3.01899)
R1^2/D10^2 : 1.20078 (-0.601503 2.02263)
kT2 [keV] : 29.6082 (-5.59845 15.0267)
R2^2/D10^2 : 3.57639E-02 (-0.0273471 0.0456393)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.92 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.399628e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.110e-07 5.689e-08
25- 50 6.326e-07 1.268e-07
50-150 1.713e-06 5.068e-07
15-150 2.556e-06 7.010e-07
Peak spectrum fit
Power-law model
Time interval is from -0.128 sec. to 0.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04984 ( -0.121411 0.118756 )
Norm@50keV : 7.74170E-02 ( -0.00598253 0.00595978 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.37 using 59 PHA bins.
# Reduced chi-squared = 1.428 for 57 degrees of freedom
# Null hypothesis probability = 1.873043e-02
Photon flux (15-150 keV) in 1 sec: 8.94138 ( -0.712199 0.713407 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.2283e-07 ( -6.41801e-08 6.42652e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.128 sec. to 0.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.249077 ( -0.611475 0.536303 )
Epeak [keV] : 128.642 ( -32.1639 133.957 )
Norm@50keV : 0.174662 ( -0.0721079 0.14147 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.56 using 59 PHA bins.
# Reduced chi-squared = 1.331 for 56 degrees of freedom
# Null hypothesis probability = 4.927705e-02
Photon flux (15-150 keV) in 1 sec: 8.78820 ( -0.71823 0.72033 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12078e-07 ( -6.691e-08 6.6402e-08 ) ergs/cm2
Band function
Time interval is from -0.128 sec. to 0.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.469603 ( -1.02842 4.50845 )
beta : -1.45378 ( 1.45415 0.306175 )
Epeak [keV] : 79.9012 ( -36.9614 84.6462 )
Norm@50keV : 0.435867 ( -0.468666 193.248 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.28 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 55 degrees of freedom
# Null hypothesis probability = 5.901223e-02
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] : 21.4749 (-1.8641 2.12545)
R^2/D10^2 : 0.358933 (-0.0960487 0.125488)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.79 using 59 PHA bins.
# Reduced chi-squared = 1.593 for 57 degrees of freedom
# Null hypothesis probability = 2.943851e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.097e-08 4.755e-09
25- 50 1.614e-07 1.825e-08
50-150 5.556e-07 6.630e-08
15-150 7.480e-07 6.710e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 37.4677 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 127.53 using 59 PHA bins.
# Reduced chi-squared = 2.2374 for 57 degrees of freedom
# Null hypothesis probability = 2.578214e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.330e-08 8.400e-09
25- 50 1.795e-07 1.790e-08
50-150 3.936e-07 1.401e-07
15-150 6.664e-07 1.582e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 15.7389 (-4.91903 3.17174)
R1^2/D10^2 : 0.793598 (-0.346738 1.19762)
kT2 [keV] : 199.324 ( )
R2^2/D10^2 : 1.01836E-03 (-0.000339077 0.00841293)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.09 using 59 PHA bins.
#Fit statistic : Chi-Squared = 71.99 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 55 degrees of freedom
# Reduced chi-squared = 1.309 for 55 degrees of freedom
# Null hypothesis probability = 6.078843e-02
# Null hypothesis probability = 6.172722e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.373e-08 1.178e-08
25- 50 1.803e-07 5.524e-08
50-150 5.742e-07 2.571e-07
15-150 7.983e-07 3.092e-07
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: 1.30359 ( -0.0832992 0.0826502 )
Norm@50keV : 3.21766E-02 ( -0.00163143 0.0016301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.41 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.333203e-01
Photon flux (15-150 keV) in 8.204 sec: 3.84131 ( -0.210489 0.211076 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60629e-06 ( -1.35448e-07 1.35555e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.614705 ( -0.399138 0.366231 )
Epeak [keV] : 116.099 ( -22.8863 64.6698 )
Norm@50keV : 6.52678E-02 ( -0.0200062 0.0315427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.42 using 59 PHA bins.
# Reduced chi-squared = 0.9539 for 56 degrees of freedom
# Null hypothesis probability = 5.731293e-01
Photon flux (15-150 keV) in 8.204 sec: 3.73320 ( -0.217 0.21804 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55911e-06 ( -1.4069e-07 1.40141e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.387045 ( -0.554434 0.960196 )
beta : -1.73573 ( 1.73385 0.286434 )
Epeak [keV] : 93.5213 ( -35.2339 74.0932 )
Norm@50keV : 8.67736E-02 ( -0.0399121 0.232568 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9609 for 55 degrees of freedom
# Null hypothesis probability = 5.573080e-01
Photon flux (15-150 keV) in 8.204 sec: 3.70838 ( 3.29162 -0.22151 ) 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) = 5.81e-07
S(50-100 keV) = 9.42e-07
T90 vs. Hardness ratio plot
T90 = 7.23199993371964 sec.
Hardness ratio (energy fluence ratio) = 1.62134
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.82404
Count Ratio (50-100 keV) / (15-25 keV) = 1.93871
Mask shadow pattern
IMX = -1.102785388212399E+00, IMY = 5.382570467303692E-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:
-294.499400 -276.523600
-239.600000 -0.908000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5382 -40.5620 2.3 50.9 -20.0 2.7199 5.0 0.6 Vela X-1
108.8093 -25.8019 2.7 50.3 14.7 3.0546 4.2 ------ UNKNOWN
124.1374 -20.4202 2.2 36.7 5.3 1.5345 5.3 ------ UNKNOWN
169.3360 -10.1920 3.4 30.6 -80.6 1.1484 3.4 ------ UNKNOWN
191.5253 7.6654 4.0 45.3 -121.4 2.9179 2.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.908000 7.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3254 -40.5700 17.6 51.0 -19.8 0.0545 0.7 9.3 Vela X-1
104.5958 -6.1092 2.8 43.8 40.8 0.4976 4.1 ------ UNKNOWN
135.1082 20.5697 2.2 15.1 108.6 0.2126 5.2 ------ UNKNOWN
185.1613 37.9185 2.4 45.4 -165.2 0.3760 4.9 ------ UNKNOWN
132.3770 -41.4883 2.6 52.4 -17.3 0.3941 4.4 ------ UNKNOWN
155.3725 -16.5119 2.6 27.7 -50.2 0.2248 4.5 ------ UNKNOWN
195.0576 32.1471 0.4 50.8 -154.0 3.7139 25.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
85.300600 962.477700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3559 35.1513 8.3 48.7 -139.1 -3.0202 -1.4 12.5 Her X-1
172.1180 45.7145 2.9 22.3 105.8 2.5300 3.9 ------ UNKNOWN
237.2297 52.7838 2.8 36.6 -165.4 2.8671 4.0 ------ UNKNOWN
227.6962 20.9927 2.8 31.1 -105.5 3.2106 4.1 ------ UNKNOWN
199.0103 -22.2040 2.7 54.5 -32.9 13.9709 4.3 ------ UNKNOWN
258.4869 34.2607 2.7 52.2 -139.1 12.5313 4.3 ------ UNKNOWN
250.9888 28.2425 3.7 48.0 -129.1 9.5401 3.1 ------ UNKNOWN
217.0670 -7.4954 6.3 44.9 -60.2 5.6241 1.8 ------ UNKNOWN
Plot creation:
Thu May 28 13:51:31 EDT 2015