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
74.7510 -9.3183 0.0148 37.6510 -70.5494 0.9746455 13.026 TRIG_00532871
Foreground time interval of the image:
-0.024 6.936 (delta_t = 6.960 [sec])
Background time interval of the image:
-239.704 -0.024 (delta_t = 239.680 [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)
The mask-weighted light curves based on cleaned DPHs
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 -0.024 sec. to 6.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65219 ( -0.181809 0.186432 )
Norm@50keV : 9.08508E-03 ( -0.00106275 0.00104959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.19 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.126069e-01
Photon flux (15-150 keV) in 6.96 sec: 1.18715 ( -0.128022 0.128107 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.87954e-07 ( -7.25824e-08 7.36396e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 6.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.796627 ( -1.1169 0.837451 )
Epeak [keV] : 62.9724 ( -15.5467 393.484 )
Norm@50keV : 2.68713E-02 ( -0.0268508 0.0850771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.17 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 56 degrees of freedom
# Null hypothesis probability = 1.457819e-01
Photon flux (15-150 keV) in 6.96 sec: 1.14943 ( -0.13465 0.13388 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.41597e-07 ( -8.52092e-08 8.70306e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 6.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.268669 ( -0.984532 0.248569 )
beta : -2.22394 ( 2.23679 0.565893 )
Epeak [keV] : 51.0410 ( -23.7094 36.8554 )
Norm@50keV : 5.69350E-02 ( -0.0621047 162.697 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 55 degrees of freedom
# Null hypothesis probability = 1.572977e-01
Photon flux (15-150 keV) in 6.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48143e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0972 (-1.35867 1.57871)
R^2/D10^2 : 0.289606 (-0.105458 0.158994)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.04 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 57 degrees of freedom
# Null hypothesis probability = 4.674184e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.243e-08 1.116e-08
25- 50 1.983e-07 2.554e-08
50-150 1.755e-07 4.371e-08
15-150 4.362e-07 6.473e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 137.862 (-51.0384 -136.551)
Norm : 4.97346 (-0.602211 0.76398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.92 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.525431e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.948e-08 1.329e-08
25- 50 1.638e-07 3.939e-08
50-150 3.118e-07 1.701e-07
15-150 5.651e-07 2.259e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.67751 (-2.26274 1.87521)
R1^2/D10^2 : 0.550587 (-0.242416 0.610207)
kT2 [keV] : 48.4532 (-27.5171 -48.4577)
R2^2/D10^2 : 1.43504E-03 (-0.00137058 0.023094)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.52 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Null hypothesis probability = 1.780429e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.484e-08 2.264e-08
25- 50 1.901e-07 5.982e-08
50-150 3.042e-07 1.483e-07
15-150 5.691e-07 2.187e-07
Peak spectrum fit
Power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38869 ( -0.21602 0.215815 )
Norm@50keV : 2.35565E-02 ( -0.00298107 0.00297546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.13 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.298810e-01
Photon flux (15-150 keV) in 1 sec: 2.86147 ( -0.371148 0.372001 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28151e-07 ( -3.15626e-08 3.17683e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38590 ( -0.22777 0.216597 )
Epeak [keV] : 9999.00 ( -9999.2 -9999.2 )
Norm@50keV : 2.36416E-02 ( -0.0236428 0.0371138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.13 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 56 degrees of freedom
# Null hypothesis probability = 2.968240e-01
Photon flux (15-150 keV) in 1 sec: 2.86130 ( -0.373 0.36919 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2817e-07 ( -3.3021e-08 3.1608e-08 ) ergs/cm2
Band function
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.95198E-02 ( 0.563348 0.563348 )
beta : -1.49256 ( 1.47115 0.27643 )
Epeak [keV] : 44.2968 ( -44.2833 92.7586 )
Norm@50keV : 0.225480 ( -0.232196 349.377 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.46 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.853086e-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] : 15.7704 (-2.67867 3.42443)
R^2/D10^2 : 0.278128 (-0.136257 0.253194)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.23 using 59 PHA bins.
# Reduced chi-squared = 1.407 for 57 degrees of freedom
# Null hypothesis probability = 2.299848e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.435e-08 3.495e-09
25- 50 5.962e-08 1.164e-08
50-150 1.031e-07 2.533e-08
15-150 1.770e-07 3.295e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 11.8676 (-1.49937 1.49924)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.14 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.683813e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.956e-08 1.658e-08
25- 50 5.686e-08 3.162e-08
50-150 1.247e-07 6.965e-08
15-150 2.111e-07 1.176e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.95008 (-2.39198 2.71378)
R1^2/D10^2 : 1.47151 (-0.838973 2.49615)
kT2 [keV] : 46.0660 (-19.7676 -46.3393)
R2^2/D10^2 : 6.46718E-03 (-0.00616485 0.0163917)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.12 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 55 degrees of freedom
# Null hypothesis probability = 3.276386e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.448e-08 1.329e-08
25- 50 5.952e-08 3.235e-08
50-150 1.452e-07 7.850e-08
15-150 2.292e-07 1.105e-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: 1.65219 ( -0.181809 0.186432 )
Norm@50keV : 9.08508E-03 ( -0.00106275 0.00104959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.19 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.126069e-01
Photon flux (15-150 keV) in 6.96 sec: 1.18715 ( -0.128022 0.128107 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.87954e-07 ( -7.25824e-08 7.36396e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.796627 ( -1.1169 0.837451 )
Epeak [keV] : 62.9724 ( -15.5467 393.484 )
Norm@50keV : 2.68713E-02 ( -0.0268508 0.0850771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.17 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 56 degrees of freedom
# Null hypothesis probability = 1.457819e-01
Photon flux (15-150 keV) in 6.96 sec: 1.14943 ( -0.13465 0.13388 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.41597e-07 ( -8.52092e-08 8.70306e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.268669 ( -0.984532 0.248569 )
beta : -2.22394 ( 2.23679 0.565893 )
Epeak [keV] : 51.0410 ( -23.7094 36.8554 )
Norm@50keV : 5.69350E-02 ( -0.0621047 162.729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 55 degrees of freedom
# Null hypothesis probability = 1.572977e-01
Photon flux (15-150 keV) in 6.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48143e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.56e-07
S(50-100 keV) = 1.99e-07
T90 vs. Hardness ratio plot
T90 = 6.08000004291534 sec.
Hardness ratio (energy fluence ratio) = 1.27564
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.55707
Count Ratio (50-100 keV) / (15-25 keV) = 0.929355
Mask shadow pattern
IMX = 2.569119331032302E-01, IMY = 7.274905239572595E-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:
-239.704000 -0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
10.1919 -10.1782 2.5 30.1 70.8 1.5198 4.6 ------ UNKNOWN
26.9554 -14.2590 2.4 18.8 39.3 0.8959 4.7 ------ UNKNOWN
26.7413 26.1649 2.9 27.7 160.1 0.8480 4.1 ------ UNKNOWN
34.9967 -25.0582 2.5 26.1 9.8 0.8697 4.6 ------ UNKNOWN
44.7235 -47.9740 3.2 49.1 -2.7 1.3718 3.6 ------ UNKNOWN
44.4236 -43.5212 2.6 44.7 -3.3 1.4332 4.5 ------ UNKNOWN
44.6915 -44.9998 3.4 46.2 -3.3 1.1751 3.4 ------ UNKNOWN
60.6637 -24.9375 2.6 33.6 -35.5 1.0496 4.5 ------ UNKNOWN
63.5253 54.4485 3.2 57.4 -160.0 3.7835 3.6 ------ UNKNOWN
78.0400 30.4346 3.2 47.9 -129.1 2.9233 3.6 ------ UNKNOWN
79.2359 4.6301 3.7 41.0 -93.1 2.7435 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.024000 6.936000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
32.6308 -42.9180 2.3 44.1 9.0 0.2486 5.1 ------ UNKNOWN
35.1525 57.7186 2.4 56.9 -179.1 0.7499 4.8 ------ UNKNOWN
74.0538 -14.4557 1.8 38.5 -62.3 0.4222 6.3 ------ UNKNOWN
74.7510 -9.3183 0.9 37.7 -70.5 0.9747 13.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
66.396590 962.386200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6356 22.0131 0.2 32.5 -158.6 36.8640 57.5 0.2 Crab
62.9917 -10.8144 2.5 11.6 87.5 2.4630 4.7 ------ UNKNOWN
123.0413 -38.2477 3.8 52.0 -42.2 10.0806 3.0 ------ UNKNOWN
Plot creation:
Sat May 30 18:35:30 EDT 2015