Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
240.9228 66.6033 0.0049 34.9036 -131.7864 2.7730124 39.099 TRIG_00208169
Foreground time interval of the image:
-5.644 11.389 (delta_t = 17.033 [sec])
Background time interval of the image:
-214.411 -5.644 (delta_t = 208.767 [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 -5.644 sec. to 38.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42960 ( -0.0734501 0.0732114 )
Norm@50keV : 5.44215E-03 ( -0.000225624 0.000225615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.91 using 59 PHA bins.
# Reduced chi-squared = 0.7703 for 57 degrees of freedom
# Null hypothesis probability = 8.982361e-01
Photon flux (15-150 keV) in 44.63 sec: 0.667343 ( -0.0296983 0.0297656 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33315e-06 ( -1.0294e-07 1.03144e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.644 sec. to 38.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11875 ( -0.307635 0.286698 )
Epeak [keV] : 151.533 ( -50.0628 800.878 )
Norm@50keV : 7.65234E-03 ( -0.00201859 0.00296819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.46 using 59 PHA bins.
# Reduced chi-squared = 0.7225 for 56 degrees of freedom
# Null hypothesis probability = 9.414073e-01
Photon flux (15-150 keV) in 44.63 sec: 0.656455 ( -0.031262 0.031303 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29043e-06 ( -1.11727e-07 1.11164e-07 ) ergs/cm2
Band function
Time interval is from -5.644 sec. to 38.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.351578 ( -0.638415 0.622767 )
beta : -1.55684 ( 1.56544 0.138002 )
Epeak [keV] : 57.0476 ( -32.8306 133.226 )
Norm@50keV : 2.36503E-02 ( -0.0239079 172.907 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.39 using 59 PHA bins.
# Reduced chi-squared = 0.6981 for 55 degrees of freedom
# Null hypothesis probability = 9.566504e-01
Photon flux (15-150 keV) in 44.63 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] : 16.7494 ( )
R^2/D10^2 : 5.18323E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 153.76 using 59 PHA bins.
# Reduced chi-squared = 2.6976 for 57 degrees of freedom
# Null hypothesis probability = 7.939739e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.327e-07 1.100e-08
25- 50 5.801e-07 3.258e-08
50-150 1.156e-06 8.167e-08
15-150 1.869e-06 8.881e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.77899 (-0.115426 0.115409)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.37 using 59 PHA bins.
# Reduced chi-squared = 0.8836 for 57 degrees of freedom
# Null hypothesis probability = 7.204060e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.089e-07 1.417e-08
25- 50 5.942e-07 2.633e-08
50-150 1.303e-06 6.360e-08
15-150 2.206e-06 1.006e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.35412 (-1.33909 1.48154)
R1^2/D10^2 : 0.366476 (-0.140469 0.269043)
kT2 [keV] : 30.7918 (-5.19743 9.52064)
R2^2/D10^2 : 4.92938E-03 (-0.00291805 0.00472903)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.55 using 59 PHA bins.
# Reduced chi-squared = 0.7736 for 55 degrees of freedom
# Null hypothesis probability = 8.899004e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.449e-07 3.758e-08
25- 50 6.011e-07 6.360e-08
50-150 1.448e-06 2.624e-07
15-150 2.294e-06 3.454e-07
Peak spectrum fit
Power-law model
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.937086 ( -0.206425 0.198062 )
Norm@50keV : 1.51053E-02 ( -0.00179157 0.00177134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
# Reduced chi-squared = 0.9142 for 57 degrees of freedom
# Null hypothesis probability = 6.587642e-01
Photon flux (15-150 keV) in 1 sec: 1.73479 ( -0.206699 0.209245 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6714e-07 ( -1.98836e-08 1.99639e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.845580 ( -0.876173 0.273248 )
Epeak [keV] : 762.130 ( -762.249 -762.249 )
Norm@50keV : 1.65289E-02 ( -0.00278303 0.0209333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.07 using 59 PHA bins.
# Reduced chi-squared = 0.9298 for 56 degrees of freedom
# Null hypothesis probability = 6.245034e-01
Photon flux (15-150 keV) in 1 sec: 1.72920 ( -0.21138 0.21112 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66816e-07 ( -2.0401e-08 2.0074e-08 ) ergs/cm2
Band function
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.11364 ( 0.79098 0.79098 )
beta : -0.984383 ( 1.10774 11.1056 )
Epeak [keV] : 43.0641 ( -395.62 -395.62 )
Norm@50keV : 0.393784 ( -0.374964 374.508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.86 using 59 PHA bins.
# Reduced chi-squared = 0.9428 for 55 degrees of freedom
# Null hypothesis probability = 5.955343e-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] : 24.1592 (-3.48949 4.5111)
R^2/D10^2 : 4.73330E-02 (-0.019409 0.0299846)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.357558e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.886e-09 1.233e-09
25- 50 2.723e-08 4.835e-09
50-150 1.183e-07 2.411e-08
15-150 1.504e-07 2.475e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.15706 (-0.858657 0.858581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.55 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 57 degrees of freedom
# Null hypothesis probability = 3.077750e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.781e-08 1.004e-08
25- 50 3.427e-08 1.904e-08
50-150 7.516e-08 4.123e-08
15-150 1.272e-07 7.080e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.49031 (-3.19512 10.8425)
R1^2/D10^2 : 0.909501 (-0.808634 5.88354)
kT2 [keV] : 34.3003 (-8.87428 -34.4179)
R2^2/D10^2 : 1.44921E-02 (-0.0134087 0.0155247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9654 for 55 degrees of freedom
# Null hypothesis probability = 5.477409e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.120e-08 6.260e-09
25- 50 2.950e-08 1.350e-08
50-150 1.267e-07 6.659e-08
15-150 1.674e-07 7.586e-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: 1.25496 ( -0.0672258 0.0666927 )
Norm@50keV : 1.08861E-02 ( -0.000419638 0.000419437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.82 using 59 PHA bins.
# Reduced chi-squared = 0.9969 for 57 degrees of freedom
# Null hypothesis probability = 4.816420e-01
Photon flux (15-150 keV) in 17.03 sec: 1.28858 ( -0.0531014 0.0532097 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85297e-06 ( -7.49819e-08 7.50878e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.901022 ( -0.279764 0.262668 )
Epeak [keV] : 173.509 ( -52.6399 301.896 )
Norm@50keV : 1.58113E-02 ( -0.00373384 0.00522157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.42 using 59 PHA bins.
# Reduced chi-squared = 0.9182 for 56 degrees of freedom
# Null hypothesis probability = 6.487820e-01
Photon flux (15-150 keV) in 17.03 sec: 1.26705 ( -0.05526 0.05537 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82173e-06 ( -7.96663e-08 7.93598e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.19148 ( -0.912794 -0.315335 )
beta : -1.38433 ( -0.123108 0.107255 )
Epeak [keV] : 42.6610 ( -21.6153 40.1092 )
Norm@50keV : 0.393229 ( -0.39089 113.324 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.78 using 59 PHA bins.
# Reduced chi-squared = 0.8323 for 55 degrees of freedom
# Null hypothesis probability = 8.076318e-01
Photon flux (15-150 keV) in 17.03 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) = 5.57e-07
S(50-100 keV) = 8.27e-07
T90 vs. Hardness ratio plot
T90 = 28.4480000138283 sec.
Hardness ratio (energy fluence ratio) = 1.48474
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.5671
Count Ratio (50-100 keV) / (15-25 keV) = 1.2921
Mask shadow pattern
IMX = -4.649187605341465E-01, IMY = 5.202310314464613E-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:
-214.411400 -5.644000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4531 35.3365 0.8 2.7 -131.7 2.0461 13.7 0.4 Her X-1
268.4312 -1.5394 8.2 36.5 35.0 0.3786 1.4 6.4 SW J1753.5-0127
288.8058 10.9268 0.9 37.9 -4.8 2.7933 12.3 1.2 GRS 1915+105
299.5967 35.2001 0.3 36.8 -48.6 8.5765 34.7 0.3 Cyg X-1
308.0142 40.7732 6.8 42.6 -58.7 -0.8280 -1.7 11.6 Cyg X-3
180.8074 51.8358 2.7 55.5 -168.3 2.2940 4.3 ------ UNKNOWN
227.8944 62.4154 2.6 34.3 -144.0 0.9266 4.5 ------ UNKNOWN
295.8252 65.8005 3.5 41.1 -98.0 2.4990 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.644000 11.388600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.7100 35.3896 7.8 2.7 -127.1 0.0590 1.5 12.7 Her X-1
268.3293 -1.5814 7.8 36.5 35.1 -0.1093 -1.5 8.1 SW J1753.5-0127
288.8042 10.9510 59.6 37.9 -4.8 -0.0116 -0.2 0.5 GRS 1915+105
299.5033 35.2510 77.7 36.7 -48.7 0.0103 0.1 5.2 Cyg X-1
308.2260 40.8637 8.2 42.7 -58.9 -0.2079 -1.4 7.5 Cyg X-3
271.1077 5.5079 2.4 31.1 25.6 0.2776 4.8 ------ UNKNOWN
186.7048 45.3496 2.1 52.9 -177.0 0.6435 5.4 ------ UNKNOWN
299.7808 2.9171 2.2 51.4 -6.3 0.5512 5.3 ------ UNKNOWN
240.9229 66.6032 0.3 34.9 -131.8 2.7729 39.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
65.188600 535.988600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4355 35.3577 1.0 32.2 48.0 4.9536 11.8 1.4 Her X-1
299.5985 35.2044 0.3 45.8 -8.1 16.9574 35.4 0.4 Cyg X-1
308.1543 41.1145 7.4 44.0 -20.5 -0.7067 -1.6 9.9 Cyg X-3
326.1550 38.3479 6.8 53.5 -34.5 2.1003 1.7 1.8 Cyg X-2
131.6316 41.8038 3.1 59.1 -166.2 9.3776 3.7 ------ UNKNOWN
343.2379 74.7274 4.2 30.4 -80.4 1.1816 2.8 ------ UNKNOWN
318.8689 28.9381 2.8 58.9 -22.7 7.0234 4.1 ------ UNKNOWN
99.8254 59.1959 3.7 51.0 -135.5 5.5426 3.2 ------ UNKNOWN
Plot creation:
Wed Jun 24 19:00:43 EDT 2015