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
127.2653 73.5641 0.0119 36.3046 -125.6238 2.0453202 16.125 TRIG_00210084
Foreground time interval of the image:
0.220 57.504 (delta_t = 57.284 [sec])
Background time interval of the image:
-239.112 0.220 (delta_t = 239.332 [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 0.220 sec. to 57.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11417 ( -0.152933 0.149131 )
Norm@50keV : 2.41130E-03 ( -0.000212534 0.000211754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.52 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.820281e-01
Photon flux (15-150 keV) in 57.28 sec: 0.280090 ( -0.0258233 0.0259406 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43761e-06 ( -1.30322e-07 1.30706e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.220 sec. to 57.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.443164 ( -0.758654 0.63522 )
Epeak [keV] : 137.634 ( -43.0298 854.426 )
Norm@50keV : 4.66700E-03 ( -0.00213419 0.0047051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.25 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 56 degrees of freedom
# Null hypothesis probability = 2.357384e-01
Photon flux (15-150 keV) in 57.28 sec: 0.270779 ( -0.027469 0.027408 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40148e-06 ( -1.37289e-07 1.36704e-07 ) ergs/cm2
Band function
Time interval is from 0.220 sec. to 57.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.443237 ( -0.516039 0.924735 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 137.616 ( -36.4677 202.65 )
Norm@50keV : 4.66690E-03 ( -0.0021331 0.00472027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.25 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.079929e-01
Photon flux (15-150 keV) in 57.28 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] : 21.7755 (-2.1874 2.56019)
R^2/D10^2 : 1.01482E-02 (-0.00309482 0.00425255)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.96 using 59 PHA bins.
# Reduced chi-squared = 1.315 for 57 degrees of freedom
# Null hypothesis probability = 5.560362e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.125e-08 9.162e-09
25- 50 2.693e-07 3.623e-08
50-150 9.539e-07 1.292e-07
15-150 1.275e-06 1.452e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.19082 (-0.105953 0.105929)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.84 using 59 PHA bins.
# Reduced chi-squared = 1.576 for 57 degrees of freedom
# Null hypothesis probability = 3.595996e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.699e-07 2.177e-08
25- 50 3.269e-07 1.284e-07
50-150 7.169e-07 3.116e-07
15-150 1.214e-06 3.884e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.06309 (-1.84748 2.99586)
R1^2/D10^2 : 0.565612 (-0.470031 4.04118)
kT2 [keV] : 25.3089 (-3.29882 4.97183)
R2^2/D10^2 : 5.84020E-03 (-0.00269731 0.00218414)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.09 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.965896e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.198e-07 5.383e-08
25- 50 2.669e-07 7.031e-08
50-150 1.003e-06 2.065e-07
15-150 1.390e-06 2.566e-07
Peak spectrum fit
Power-law model
Time interval is from 5.584 sec. to 6.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.712326 ( -0.430426 0.378625 )
Norm@50keV : 7.14601E-03 ( -0.00184707 0.00176648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.66 using 59 PHA bins.
# Reduced chi-squared = 0.9239 for 57 degrees of freedom
# Null hypothesis probability = 6.383156e-01
Photon flux (15-150 keV) in 1 sec: 0.825217 ( -0.194705 0.197769 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67453e-08 ( -1.92548e-08 1.93076e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.584 sec. to 6.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.88615E-02 ( -2.78815 1.4117 )
Epeak [keV] : 178.810 ( -178.808 -178.808 )
Norm@50keV : 1.37837E-02 ( -0.00812493 0.0738346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9290 for 56 degrees of freedom
# Null hypothesis probability = 6.261294e-01
Photon flux (15-150 keV) in 1 sec: 0.801483 ( -0.202604 0.204017 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58487e-08 ( -1.9822e-08 1.96523e-08 ) ergs/cm2
Band function
Time interval is from 5.584 sec. to 6.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.697318 ( 0.706572 0.706572 )
beta : -0.728038 ( -0.378616 0.43021 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.19397E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.65 using 59 PHA bins.
# Reduced chi-squared = 0.9573 for 55 degrees of freedom
# Null hypothesis probability = 5.649636e-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] : 29.5087 (-7.1436 12.275)
R^2/D10^2 : 1.34447E-02 (-0.00841675 0.0175709)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.77 using 59 PHA bins.
# Reduced chi-squared = 0.9257 for 57 degrees of freedom
# Null hypothesis probability = 6.345228e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.850e-09 9.509e-10
25- 50 1.134e-08 5.035e-09
50-150 7.016e-08 3.369e-08
15-150 8.334e-08 3.674e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.38268 (-0.834717 0.834591)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.66 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.018876e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.431e-09 5.140e-09
25- 50 1.622e-08 9.960e-09
50-150 3.557e-08 2.091e-08
15-150 6.022e-08 3.617e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.19136 (-7.21516 -7.21516)
R1^2/D10^2 : 0.361619 (-0.347749 -0.347749)
kT2 [keV] : 34.8007 (-10.5806 -35.0173)
R2^2/D10^2 : 7.76144E-03 (-0.00761556 0.0154362)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.92 using 59 PHA bins.
# Reduced chi-squared = 0.9259 for 55 degrees of freedom
# Null hypothesis probability = 6.310180e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.423e-09 2.677e-09
25- 50 1.317e-08 6.990e-09
50-150 7.016e-08 4.186e-08
15-150 8.775e-08 4.711e-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: 1.11417 ( -0.152933 0.149131 )
Norm@50keV : 2.41130E-03 ( -0.000212534 0.000211754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.52 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.820281e-01
Photon flux (15-150 keV) in 57.28 sec: 0.280090 ( -0.0258233 0.0259406 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43761e-06 ( -1.30322e-07 1.30706e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.443164 ( -0.758654 0.63522 )
Epeak [keV] : 137.634 ( -43.0298 854.426 )
Norm@50keV : 4.66700E-03 ( -0.00213419 0.0047051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.25 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 56 degrees of freedom
# Null hypothesis probability = 2.357384e-01
Photon flux (15-150 keV) in 57.28 sec: 0.270779 ( -0.027469 0.027408 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40148e-06 ( -1.37289e-07 1.36704e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.443237 ( -0.516039 0.924735 )
beta : -10.0000 ( 10 8.88178e-15 )
Epeak [keV] : 137.616 ( -36.4677 202.649 )
Norm@50keV : 4.66690E-03 ( -0.0021331 0.00472027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.25 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.079929e-01
Photon flux (15-150 keV) in 57.28 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) = 2.87e-07
S(50-100 keV) = 5.29e-07
T90 vs. Hardness ratio plot
T90 = 52.3720000088215 sec.
Hardness ratio (energy fluence ratio) = 1.84321
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.62177
Count Ratio (50-100 keV) / (15-25 keV) = 1.98015
Mask shadow pattern
IMX = -4.279320086049428E-01, IMY = 5.972037963287603E-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:
-239.112000 0.220000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5286 35.2978 11.0 29.3 48.3 0.2338 1.0 4.4 Her X-1
299.6018 35.1962 0.5 47.5 -5.2 8.5324 24.4 0.7 Cyg X-1
308.0393 40.9207 3.1 46.8 -17.1 1.1591 3.7 3.7 Cyg X-3
326.2094 38.3627 6.6 57.1 -29.6 -1.9347 -1.8 3.0 Cyg X-2
133.0944 47.7006 3.9 54.1 -152.9 1.8158 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.220000 57.504000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5481 35.3402 7.3 29.3 48.2 0.1567 1.6 4.4 Her X-1
299.7215 35.2158 12.1 47.5 -5.3 -0.1406 -1.0 6.5 Cyg X-1
308.2451 40.9636 4.1 46.9 -17.3 0.3953 2.8 6.1 Cyg X-3
326.2824 38.2401 4.1 57.2 -29.6 1.3377 2.8 7.2 Cyg X-2
127.2652 73.5641 0.7 36.3 -125.6 2.0454 16.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
178.788600 423.038000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6882 35.4077 0.0 23.5 105.5 0.0636 1.2 11.9 Her X-1
288.8539 10.8118 4.3 39.9 30.7 0.2216 2.7 8.7 GRS 1915+105
299.6327 35.2187 0.6 20.5 -7.1 0.8192 19.3 2.3 Cyg X-1
308.1475 40.9533 2.5 21.5 -31.7 0.2041 4.7 1.7 Cyg X-3
326.3290 38.4719 7.0 34.5 -44.2 -0.0947 -1.6 11.7 Cyg X-2
219.2760 31.6682 1.7 48.0 135.8 1.2892 6.6 ------ UNKNOWN
87.9849 86.0200 2.1 43.9 -134.5 0.4931 5.4 ------ UNKNOWN
336.1758 14.0251 2.9 57.8 -27.9 1.0517 4.0 ------ UNKNOWN
69.6749 80.5756 2.7 48.3 -129.4 0.8158 4.3 ------ UNKNOWN
Plot creation:
Sun May 31 13:12:49 EDT 2015