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
313.0618 72.2810 0.0306 17.0897 -98.2310 0.0568554 6.316 TRIG_00315710
Foreground time interval of the image:
-0.048 0.528 (delta_t = 0.576 [sec])
Background time interval of the image:
-588.491 -508.521 (delta_t = 79.971 [sec])
-239.592 -0.048 (delta_t = 239.544 [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 0.512000
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 0.512000
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 0.512000
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 -0.048 sec. to 0.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23734 ( -0.428408 0.414525 )
Norm@50keV : 6.57717E-03 ( -0.0016105 0.00160559 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.22 using 59 PHA bins.
# Reduced chi-squared = 0.6880 for 57 degrees of freedom
# Null hypothesis probability = 9.652376e-01
Photon flux (15-150 keV) in 0.576 sec: 0.776330 ( -0.190713 0.191009 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80423e-08 ( -1.04289e-08 1.0699e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 0.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.885089 ( -2.00749 0.750868 )
Epeak [keV] : 157.508 ( -157.514 -157.514 )
Norm@50keV : 9.97616E-03 ( -0.00493993 0.0925732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.06 using 59 PHA bins.
# Reduced chi-squared = 0.6976 for 56 degrees of freedom
# Null hypothesis probability = 9.584724e-01
Photon flux (15-150 keV) in 0.576 sec: 0.766933 ( -0.195888 0.194722 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69127e-08 ( -1.1705e-08 1.1535e-08 ) ergs/cm2
Band function
Time interval is from -0.048 sec. to 0.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.48330 ( -0.742832 0.542781 )
Epeak [keV] : 30.8354 ( -30.8112 66.7621 )
Norm@50keV : 173.634 ( -41.8714 2.73055e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.20 using 59 PHA bins.
# Reduced chi-squared = 0.6946 for 55 degrees of freedom
# Null hypothesis probability = 9.587220e-01
Photon flux (15-150 keV) in 0.576 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] : 16.7286 (-5.00784 7.92688)
R^2/D10^2 : 6.35537E-02 (-0.0455979 0.148374)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.54 using 59 PHA bins.
# Reduced chi-squared = 0.7463 for 57 degrees of freedom
# Null hypothesis probability = 9.230025e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.095e-09 1.306e-09
25- 50 9.151e-09 5.140e-09
50-150 1.819e-08 1.134e-08
15-150 2.944e-08 1.356e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-99.3696 -199.363)
Norm : 3.17562 (-0.781834 0.783542)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.50 using 59 PHA bins.
# Reduced chi-squared = 0.7105 for 57 degrees of freedom
# Null hypothesis probability = 9.517877e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.555e-09 2.797e-09
25- 50 8.762e-09 5.132e-09
50-150 1.922e-08 1.168e-08
15-150 3.253e-08 1.932e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.17064 (-4.61363 6.32206)
R1^2/D10^2 : 0.444927 (-0.389793 6.72681)
kT2 [keV] : 32.5326 (-29.0975 -32.6145)
R2^2/D10^2 : 5.48159E-03 (-0.00544672 0.0221412)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.49 using 59 PHA bins.
# Reduced chi-squared = 0.6999 for 55 degrees of freedom
# Null hypothesis probability = 9.555411e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.638e-09 2.268e-09
25- 50 8.864e-09 4.720e-09
50-150 2.441e-08 1.484e-08
15-150 3.691e-08 1.896e-08
Peak spectrum fit
Power-law model
Time interval is from -0.228 sec. to 0.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26422 ( -0.517979 0.514421 )
Norm@50keV : 3.92175E-03 ( -0.00118322 0.00117747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.50 using 59 PHA bins.
# Reduced chi-squared = 0.6755 for 57 degrees of freedom
# Null hypothesis probability = 9.713851e-01
Photon flux (15-150 keV) in 1 sec: 0.464916 ( -0.139736 0.140035 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91037e-08 ( -1.31032e-08 1.35634e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.228 sec. to 0.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.78873E-02 ( -4.02387 1.60962 )
Epeak [keV] : 83.7375 ( -57.3946 -83.7382 )
Norm@50keV : 1.48359E-02 ( -0.0148354 0.865163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.70 using 59 PHA bins.
# Reduced chi-squared = 0.6733 for 56 degrees of freedom
# Null hypothesis probability = 9.712201e-01
Photon flux (15-150 keV) in 1 sec: 0.442395 ( -0.149738 0.147043 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60216e-08 ( -1.34757e-08 1.47958e-08 ) ergs/cm2
Band function
Time interval is from -0.228 sec. to 0.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.224621 ( 0.224305 0.224305 )
beta : -2.78735 ( 2.5 12.5 )
Epeak [keV] : 87.9679 ( -86.214 399.112 )
Norm@50keV : 1.26921E-02 ( -0.0137033 0.0214026 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.71 using 59 PHA bins.
# Reduced chi-squared = 0.6856 for 55 degrees of freedom
# Null hypothesis probability = 9.637964e-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] : 17.3045 (-5.01676 7.87347)
R^2/D10^2 : 3.51764E-02 (-0.0351764 0.076023)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.31 using 59 PHA bins.
# Reduced chi-squared = 0.6721 for 57 degrees of freedom
# Null hypothesis probability = 9.729163e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.135e-09 1.354e-09
25- 50 9.578e-09 5.765e-09
50-150 2.059e-08 1.365e-08
15-150 3.230e-08 2.105e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-116.347 -199.363)
Norm : 1.90608 (-0.573152 0.573154)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.04 using 59 PHA bins.
# Reduced chi-squared = 0.6850 for 57 degrees of freedom
# Null hypothesis probability = 9.668243e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.746e-09 2.920e-09
25- 50 9.130e-09 5.715e-09
50-150 2.002e-08 1.240e-08
15-150 3.390e-08 2.100e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.27855 (-3.27856 23.7823)
R1^2/D10^2 : 5.40151 (-5.40146 -5.40146)
kT2 [keV] : 19.0451 (-6.02852 -19.0451)
R2^2/D10^2 : 2.43775E-02 (-0.0243775 0.0641041)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.35 using 59 PHA bins.
# Reduced chi-squared = 0.6791 for 55 degrees of freedom
# Null hypothesis probability = 9.671858e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.454e-09 1.608e-09
25- 50 8.704e-09 5.170e-09
50-150 2.231e-08 1.427e-08
15-150 3.447e-08 2.102e-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: 1.23734 ( -0.428408 0.414525 )
Norm@50keV : 6.57717E-03 ( -0.0016105 0.00160559 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.22 using 59 PHA bins.
# Reduced chi-squared = 0.6880 for 57 degrees of freedom
# Null hypothesis probability = 9.652376e-01
Photon flux (15-150 keV) in 0.576 sec: 0.776330 ( -0.190713 0.191009 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80423e-08 ( -1.04289e-08 1.0699e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.885089 ( -2.00749 0.750868 )
Epeak [keV] : 157.508 ( -157.514 -157.514 )
Norm@50keV : 9.97616E-03 ( -0.00493993 0.0925732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.06 using 59 PHA bins.
# Reduced chi-squared = 0.6976 for 56 degrees of freedom
# Null hypothesis probability = 9.584724e-01
Photon flux (15-150 keV) in 0.576 sec: 0.766933 ( -0.195888 0.194722 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69127e-08 ( -1.1705e-08 1.1535e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.48330 ( -0.742832 0.542781 )
Epeak [keV] : 30.8354 ( -30.8112 66.7621 )
Norm@50keV : 173.634 ( -41.8714 2.73055e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.20 using 59 PHA bins.
# Reduced chi-squared = 0.6946 for 55 degrees of freedom
# Null hypothesis probability = 9.587220e-01
Photon flux (15-150 keV) in 0.576 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) = 8.17e-09
S(50-100 keV) = 1.39e-08
T90 vs. Hardness ratio plot
T90 = 0.512000024318695 sec.
Hardness ratio (energy fluence ratio) = 1.70135
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.58856
Count Ratio (50-100 keV) / (15-25 keV) = 1.52214
Mask shadow pattern
IMX = -4.401498145025333E-02, IMY = 3.042762687946984E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-588.491400 -508.520700
-239.592000 -0.048000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3951 35.2957 4.1 36.3 140.2 -1.3635 -2.8 4.2 Her X-1
299.5890 35.2007 0.3 21.1 64.0 11.9573 42.9 0.1 Cyg X-1
308.1594 41.0191 1.6 16.5 40.0 1.7079 7.2 4.6 Cyg X-3
325.9932 38.3934 4.6 25.5 9.4 0.6410 2.5 9.4 Cyg X-2
335.1876 80.3834 3.7 26.6 -100.5 1.0933 3.1 ------ UNKNOWN
19.0586 42.8891 3.0 50.8 -44.5 5.9754 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.048000 0.528000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6439 35.3129 10.6 36.1 139.9 -0.0155 -1.1 9.3 Her X-1
299.5024 35.1198 3.2 21.2 64.2 -0.0341 -3.6 6.5 Cyg X-1
308.3474 40.9610 37.4 16.6 39.6 0.0026 0.3 10.8 Cyg X-3
326.1733 38.5067 4.2 25.5 9.0 -0.0247 -2.7 11.1 Cyg X-2
220.7310 57.3583 2.3 40.2 -168.2 0.0590 5.1 ------ UNKNOWN
313.0621 72.2810 1.8 17.1 -98.2 0.0569 6.3 ------ UNKNOWN
55.2994 76.9486 2.5 41.1 -95.5 0.1497 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
50.508640 962.497500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5939 35.1981 0.6 37.7 79.5 34.4169 18.7 0.3 Cyg X-1
308.3101 41.0457 3.0 31.3 68.3 3.2294 3.8 10.6 Cyg X-3
326.2714 38.3546 5.1 34.6 43.0 1.7413 2.3 5.1 Cyg X-2
347.2803 31.4878 3.2 44.6 18.4 3.5439 3.6 ------ UNKNOWN
Plot creation:
Thu Nov 12 16:44:49 EST 2015