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
209.706 47.001 0.000 18.903 18.099 3.995 12.617 TRIG_00349450
Image time interval: -239.000 to 336.000 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 318.376 sec. to 627.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81356 ( -0.1341 0.137419 )
Norm@50keV : 7.66940E-04 ( -5.98188e-05 5.87748e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.81 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 57 degrees of freedom
# Null hypothesis probability = 3.404404e-01
Photon flux (15-150 keV) in 309.4 sec: 0.106243 ( -0.00711587 0.0071296 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18355e-06 ( -1.72245e-07 1.74529e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 318.376 sec. to 627.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52388 ( -0.140361 0.135232 )
Epeak [keV] : 179.780 ( -9999.35 -9999.36 )
Norm@50keV : 3.57902E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.56 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 56 degrees of freedom
# Null hypothesis probability = 3.474051e-01
Photon flux (15-150 keV) in 309.4 sec: 0.106388 ( -0.0073748 0.006997 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18501e-06 ( -1.73524e-07 1.65192e-07 ) ergs/cm2
Band function
Time interval is from 318.376 sec. to 627.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43161 ( 1.44847 1.44847 )
beta : -1.81297 ( -0.137464 0.134012 )
Epeak [keV] : 21.2047 ( -18.229 -18.229 )
Norm@50keV : 1.81384E-03 ( -0.000880528 0.0624402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.81 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 2.746753e-01
Photon flux (15-150 keV) in 309.4 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] : 11.1876 ( )
R^2/D10^2 : 3.05806E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 149.76 using 59 PHA bins.
# Reduced chi-squared = 2.6273 for 57 degrees of freedom
# Null hypothesis probability = 2.889383e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.482e-07 2.879e-08
25- 50 7.172e-07 5.585e-08
50-150 5.136e-07 8.601e-08
15-150 1.479e-06 1.170e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 104.805 (-25.6942 51.3794)
Norm : 0.457705 (-0.0449392 0.0476818)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.63 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.216683e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.701e-07 3.960e-08
25- 50 6.459e-07 5.090e-08
50-150 1.074e-06 3.431e-07
15-150 2.090e-06 3.923e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.63662 (-0.847806 0.951413)
R1^2/D10^2 : 0.322029 (-0.14664 0.307806)
kT2 [keV] : 26.3581 (-5.04939 8.30614)
R2^2/D10^2 : 1.14690E-03 (-0.000671016 0.00125502)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.262227e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.240e-07 8.908e-08
25- 50 5.741e-07 1.027e-07
50-150 1.260e-06 3.679e-07
15-150 2.258e-06 5.165e-07
Peak spectrum fit
Power-law model
Time interval is from 409.700 sec. to 410.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98042 ( -0.722189 0.809983 )
Norm@50keV : 1.97128E-03 ( -0.00102612 0.000995049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.69 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 57 degrees of freedom
# Null hypothesis probability = 7.863088e-02
Photon flux (15-150 keV) in 1 sec: 0.293061 ( -0.110276 0.110401 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81615e-08 ( -8.37396e-09 9.56668e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 409.700 sec. to 410.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.02724 ( )
Epeak [keV] : 25.8275 ( -4.46184 5.3358 )
Norm@50keV : 367.880 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.86 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 56 degrees of freedom
# Null hypothesis probability = 1.517703e-01
Photon flux (15-150 keV) in 1 sec: 0.292142 0.291086 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10558e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 409.700 sec. to 410.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.21109 -5 )
beta : -7.06107 ( 6.92171 4.5275 )
Epeak [keV] : 25.8730 ( -4.0882 4.63199 )
Norm@50keV : 381.291 ( -125.202 866.32 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.59 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.359468e-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] : 6.31266 (-1.44606 2.00804)
R^2/D10^2 : 0.901837 (-0.895224 1.68728)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.90 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.172642e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.118e-09 3.154e-09
25- 50 5.690e-09 3.782e-09
50-150 6.388e-10 5.770e-10
15-150 1.145e-08 7.570e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.2406 (-25.9865 -41.1887)
Norm : 1.82809 (-1.00715 2.59581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.95 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 57 degrees of freedom
# Null hypothesis probability = 7.568865e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.240e-09 2.680e-09
25- 50 5.652e-09 3.732e-09
50-150 4.520e-09 3.797e-09
15-150 1.441e-08 9.660e-09
Double BB
R1^2/D10^2 : 4.84804E-05 (-3.85965e-05 0.00246318)
kT2 [keV] : 6.03483 (-1.36269 1.73752)
R2^2/D10^2 : 1.02828 (-0.707938 1.99421)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.90 using 59 PHA bins.
#Fit statistic : Chi-Squared = 65.77 using 59 PHA bins.
#Fit statistic : Chi-Squared = 65.73 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 55 degrees of freedom
# Reduced chi-squared = 1.196 for 55 degrees of freedom
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 8.503706e-02
# Null hypothesis probability = 1.517506e-01
# Null hypothesis probability = 1.524276e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.097e-09 3.070e-03
25- 50 5.761e-09 3.052e-02
50-150 6.687e-10 7.325e-01
15-150 1.153e-08 6.965e-01
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: 1.93293 ( -0.530287 0.63337 )
Norm@50keV : 7.86595E-04 ( -0.000295944 0.000263847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.402196e-01
Photon flux (15-150 keV) in 17.72 sec: 0.114496 ( -0.0282146 0.0282156 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28201e-07 ( -4.23515e-08 4.53035e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.92138 ( -1.54574 7.10543e-15 )
Epeak [keV] : 280.693 ( )
Norm@50keV : 2.54592E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.853775e-01
Photon flux (15-150 keV) in 17.72 sec: 0.114405 ( -0.0281759 0.028167 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2697e-07 ( -4.10512e-08 2.41584e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60066 ( 1.60071 1.60071 )
beta : -1.93294 ( 1.93311 0.53023 )
Epeak [keV] : 11.3778 ( -11.375 -11.375 )
Norm@50keV : 1.90639E-03 ( -0.00190666 0.0409848 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.864053e-01
Photon flux (15-150 keV) in 17.72 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) = 6.18e-07
S(50-100 keV) = 7.03e-07
T90 vs. Hardness ratio plot
T90 = 266.940000027418 sec.
Hardness ratio (energy fluence ratio) = 1.13754
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.989203
Count Ratio (50-100 keV) / (15-25 keV) = 0.715677
Mask shadow pattern
IMX = 0.325497189204, IMY = -0.10638003043
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-239.000000 318.376000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4731 35.4002 4.7 53.3 5.0 2.8492 2.5 3.5 Her X-1
209.6969 47.0072 1.0 18.9 18.1 3.7318 12.1 ------ UNKNOWN
215.8100 55.3435 2.8 21.1 -8.2 1.3152 4.2 ------ UNKNOWN
111.7201 31.4564 3.2 53.7 -154.4 3.6750 3.6 ------ UNKNOWN
294.8754 75.1889 3.4 47.0 -53.0 6.0351 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
318.376000 336.100590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4949 35.2991 3.8 53.4 5.0 0.5001 3.1 3.2 Her X-1
275.5954 88.9970 1.9 39.5 -70.1 0.6801 6.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
376.100590 963.095200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4220 35.3145 1.2 35.1 -1.4 4.2340 9.3 2.4 Her X-1
158.6473 34.1156 2.7 40.1 175.8 1.9586 4.3 ------ UNKNOWN
209.6975 47.0107 0.7 0.0 -156.4 5.0072 16.3 ------ UNKNOWN
136.9516 30.0991 3.2 57.2 -173.8 5.4999 3.6 ------ UNKNOWN
252.9744 51.2439 2.9 28.2 -29.2 1.3404 3.9 ------ UNKNOWN
128.1843 35.8053 3.5 59.4 -163.2 9.1257 3.3 ------ UNKNOWN
Plot creation:
Wed Nov 25 14:46:13 EST 2015