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
170.7761 -3.5172 0.0061 4.6259 -31.7937 4.9931852 31.756 TRIG_00537195
Foreground time interval of the image:
-152.211 15.389 (delta_t = 167.600 [sec])
Background time interval of the image:
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 -209.004 sec. to 98.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51396 ( -0.05421 0.054271 )
Norm@50keV : 2.73177E-03 ( -7.55408e-05 7.55037e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7192 for 57 degrees of freedom
# Null hypothesis probability = 9.456494e-01
Photon flux (15-150 keV) in 307.3 sec: 0.342327 ( -0.0102688 0.0102992 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.94579e-06 ( -2.361e-07 2.36684e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -209.004 sec. to 98.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42663 ( -0.217774 0.119001 )
Epeak [keV] : 347.969 ( -347.99 -347.99 )
Norm@50keV : 3.00346E-03 ( -0.000331879 0.000777686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.49 using 59 PHA bins.
# Reduced chi-squared = 0.7231 for 56 degrees of freedom
# Null hypothesis probability = 9.409899e-01
Photon flux (15-150 keV) in 307.3 sec: 0.339973 ( -0.01158 0.005805 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.89103e-06 ( -2.74818e-07 2.70332e-07 ) ergs/cm2
Band function
Time interval is from -209.004 sec. to 98.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.570665 ( 0.861479 0.861479 )
beta : -1.55294 ( 1.55813 0.0773853 )
Epeak [keV] : 46.9445 ( -46.8744 290.035 )
Norm@50keV : 1.13342E-02 ( -0.0114303 196.101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.78 using 59 PHA bins.
# Reduced chi-squared = 0.7052 for 55 degrees of freedom
# Null hypothesis probability = 9.521295e-01
Photon flux (15-150 keV) in 307.3 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] : 15.8542 ( )
R^2/D10^2 : 3.03658E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 307.32 using 59 PHA bins.
# Reduced chi-squared = 5.3916 for 57 degrees of freedom
# Null hypothesis probability = 5.282205e-36
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.859e-07 2.812e-08
25- 50 2.029e-06 7.268e-08
50-150 3.552e-06 1.844e-07
15-150 6.066e-06 1.967e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.39357 (-0.0383558 0.0383553)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.71 using 59 PHA bins.
# Reduced chi-squared = 0.8194 for 57 degrees of freedom
# Null hypothesis probability = 8.329050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.066e-06 3.442e-08
25- 50 2.052e-06 6.131e-08
50-150 4.499e-06 1.383e-07
15-150 7.617e-06 2.397e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.93346 (-0.858616 0.92673)
R1^2/D10^2 : 0.232003 (-0.0679198 0.107268)
kT2 [keV] : 30.6153 (-3.97344 5.93928)
R2^2/D10^2 : 2.46186E-03 (-0.00108006 0.00153976)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.54 using 59 PHA bins.
# Reduced chi-squared = 0.9189 for 55 degrees of freedom
# Null hypothesis probability = 6.455279e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.159e-07 9.250e-08
25- 50 2.072e-06 1.331e-07
50-150 4.830e-06 5.286e-07
15-150 7.818e-06 5.747e-07
Peak spectrum fit
Power-law model
Time interval is from -190.720 sec. to -189.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05748 ( -0.152917 0.150812 )
Norm@50keV : 2.18813E-02 ( -0.00181142 0.00181036 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.54 using 59 PHA bins.
# Reduced chi-squared = 0.7463 for 57 degrees of freedom
# Null hypothesis probability = 9.230118e-01
Photon flux (15-150 keV) in 1 sec: 2.52868 ( -0.21276 0.213082 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31978e-07 ( -2.18781e-08 2.20126e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -190.720 sec. to -189.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05224 ( -0.357942 0.210054 )
Epeak [keV] : 9999.35 ( )
Norm@50keV : 2.20044E-02 ( -0.00181885 0.0103387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.56 using 59 PHA bins.
# Reduced chi-squared = 0.7600 for 56 degrees of freedom
# Null hypothesis probability = 9.072788e-01
Photon flux (15-150 keV) in 1 sec: 2.52806 ( -0.20916 0.21274 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31315e-07 ( -2.1205e-08 2.2462e-08 ) ergs/cm2
Band function
Time interval is from -190.720 sec. to -189.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99998 -4.99998 )
beta : -1.07543 ( -0.162847 0.160268 )
Epeak [keV] : 22.6202 ( -22.6202 6.83253 )
Norm@50keV : 2803.07 ( -231.564 4.55904e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.39 using 59 PHA bins.
# Reduced chi-squared = 0.7707 for 55 degrees of freedom
# Null hypothesis probability = 8.932723e-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] : 22.1720 (-2.72872 3.21548)
R^2/D10^2 : 8.56573E-02 (-0.0290847 0.0432713)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.02 using 59 PHA bins.
# Reduced chi-squared = 1.421 for 57 degrees of freedom
# Null hypothesis probability = 1.994921e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.765e-09 1.348e-09
25- 50 4.125e-08 5.325e-09
50-150 1.515e-07 2.175e-08
15-150 2.005e-07 2.170e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 10.1586 (-0.872838 0.872809)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.19 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.470503e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.529e-08 5.310e-09
25- 50 4.865e-08 9.525e-09
50-150 1.067e-07 5.511e-08
15-150 1.806e-07 8.076e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.74479 (-1.62624 2.17679)
R1^2/D10^2 : 2.38577 (-1.45007 4.21739)
kT2 [keV] : 35.2745 (-7.1136 14.0113)
R2^2/D10^2 : 1.85252E-02 (-0.0112599 0.0182543)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.45 using 59 PHA bins.
# Reduced chi-squared = 0.7354 for 55 degrees of freedom
# Null hypothesis probability = 9.289441e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.000e-08 9.442e-09
25- 50 4.261e-08 1.319e-08
50-150 1.756e-07 6.322e-08
15-150 2.382e-07 6.645e-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: 1.55516 ( -0.0869538 0.0874931 )
Norm@50keV : 1.86983E-03 ( -8.77785e-05 8.74785e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.33 using 59 PHA bins.
# Reduced chi-squared = 0.7778 for 57 degrees of freedom
# Null hypothesis probability = 8.895052e-01
Photon flux (15-150 keV) in 167.6 sec: 0.237065 ( -0.0110899 0.0111179 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94808e-06 ( -1.51491e-07 1.52475e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47952 ( -0.3516 0.153192 )
Epeak [keV] : 331.547 ( -353.65 -353.65 )
Norm@50keV : 2.04125E-03 ( -0.000244495 0.000997056 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.21 using 59 PHA bins.
# Reduced chi-squared = 0.7894 for 56 degrees of freedom
# Null hypothesis probability = 8.727628e-01
Photon flux (15-150 keV) in 167.6 sec: 0.235921 ( -0.012183 0.011865 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92847e-06 ( -1.79969e-07 1.68203e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18873 ( 1.09157 1.09157 )
beta : -1.63215 ( 1.63049 0.149741 )
Epeak [keV] : 87.3482 ( -75.3592 -75.3592 )
Norm@50keV : 3.03225E-03 ( -0.00117686 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.56 using 59 PHA bins.
# Reduced chi-squared = 0.7921 for 55 degrees of freedom
# Null hypothesis probability = 8.668965e-01
Photon flux (15-150 keV) in 167.6 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) = 1.98e-06
S(50-100 keV) = 2.77e-06
T90 vs. Hardness ratio plot
T90 = 226.199999928474 sec.
Hardness ratio (energy fluence ratio) = 1.39899
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.38149
Count Ratio (50-100 keV) / (15-25 keV) = 1.00768
Mask shadow pattern
IMX = 6.877185746185352E-02, IMY = 4.262995032197137E-02
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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-152.211400 15.388600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5379 -40.4936 4.2 52.5 3.1 1.3168 2.7 3.7 Vela X-1
204.5152 47.6410 2.3 55.0 176.8 3.8321 5.1 ------ UNKNOWN
170.7761 -3.5172 0.4 4.6 -31.8 4.9920 31.7 ------ UNKNOWN
155.9854 -40.7135 2.6 43.9 -14.4 1.0894 4.4 ------ UNKNOWN
204.0446 13.2795 2.8 35.2 -142.2 0.9182 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
48.588590 139.208000
140.488000 962.629900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5564 -40.4534 7.3 48.7 19.2 2.1142 1.6 6.2 Vela X-1
170.3344 -60.6319 4.2 57.1 -16.3 6.1096 2.8 0.8 Cen X-3
188.6840 42.9630 2.6 49.2 -179.2 4.9591 4.5 ------ UNKNOWN
194.7679 40.4368 3.1 49.2 -172.4 4.3928 3.8 ------ UNKNOWN
185.1682 -9.7991 2.9 15.6 -82.2 1.9960 4.0 ------ UNKNOWN
213.5446 40.2877 5.2 58.7 -159.2 10.1938 2.2 ------ UNKNOWN
211.9942 -7.7374 5.2 41.2 -98.8 7.6803 2.2 ------ UNKNOWN
Plot creation:
Wed Jun 10 21:23:11 EDT 2015