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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
70.4863 -11.2648 0.0062 14.4854 28.6639 2.3870557 31.176 TRIG_00337073
Foreground time interval of the image:
-12.868 24.365 (delta_t = 37.233 [sec])
Background time interval of the image:
-94.435 -12.868 (delta_t = 81.567 [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 2.048000
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 2.048000
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 2.048000
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 -12.868 sec. to 142.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37641 ( -0.133815 0.134315 )
Norm@50keV : 1.22567E-03 ( -8.6905e-05 8.64901e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.51 using 59 PHA bins.
# Reduced chi-squared = 0.9563 for 57 degrees of freedom
# Null hypothesis probability = 5.690848e-01
Photon flux (15-150 keV) in 155.8 sec: 0.148484 ( -0.0103106 0.0103275 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8543e-06 ( -1.52074e-07 1.54014e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.868 sec. to 142.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37337 ( -0.331183 0.154438 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 1.23011E-03 ( -8.74908e-05 8.43032e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9737 for 56 degrees of freedom
# Null hypothesis probability = 5.308344e-01
Photon flux (15-150 keV) in 155.8 sec: 0.148443 ( -0.010316 0.010296 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85266e-06 ( -1.5164e-07 1.51858e-07 ) ergs/cm2
Band function
Time interval is from -12.868 sec. to 142.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12529 ( 1.12529 1.12529 )
beta : -1.37640 ( -0.13433 0.133822 )
Epeak [keV] : 33.9094 ( -33.9094 -33.9094 )
Norm@50keV : 2.37620E-03 ( -0.000932872 0.175964 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.51 using 59 PHA bins.
# Reduced chi-squared = 0.9911 for 55 degrees of freedom
# Null hypothesis probability = 4.933231e-01
Photon flux (15-150 keV) in 155.8 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] : 15.9645 (-1.59803 1.835)
R^2/D10^2 : 1.32956E-02 (-0.00405032 0.00572607)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.76 using 59 PHA bins.
# Reduced chi-squared = 1.9607 for 57 degrees of freedom
# Null hypothesis probability = 2.013744e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.092e-07 1.519e-08
25- 50 4.587e-07 4.183e-08
50-150 8.164e-07 1.236e-07
15-150 1.384e-06 1.347e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.602072 (-0.0418754 0.0418757)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.24 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.264399e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.349e-07 2.111e-08
25- 50 4.518e-07 5.835e-08
50-150 9.909e-07 3.449e-07
15-150 1.677e-06 3.759e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.38229 (-1.55182 1.89411)
R1^2/D10^2 : 0.203985 (-0.118562 0.316707)
kT2 [keV] : 28.7316 (-6.06417 12.441)
R2^2/D10^2 : 1.62441E-03 (-0.00108825 0.00198444)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.007620e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.205e-07 7.439e-08
25- 50 4.159e-07 1.158e-07
50-150 1.229e-06 3.985e-07
15-150 1.865e-06 5.293e-07
Peak spectrum fit
Power-law model
Time interval is from 17.968 sec. to 18.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22881 ( -0.120588 0.1204 )
Norm@50keV : 2.08260E-02 ( -0.00136442 0.00136214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.19 using 59 PHA bins.
# Reduced chi-squared = 0.9331 for 57 degrees of freedom
# Null hypothesis probability = 6.189046e-01
Photon flux (15-150 keV) in 1 sec: 2.45493 ( -0.161863 0.162016 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0961e-07 ( -1.59295e-08 1.60617e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.968 sec. to 18.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22467 ( -0.459984 0.123199 )
Epeak [keV] : 9998.34 ( )
Norm@50keV : 2.09223E-02 ( -0.00137083 0.0134036 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.19 using 59 PHA bins.
# Reduced chi-squared = 0.9498 for 56 degrees of freedom
# Null hypothesis probability = 5.820558e-01
Photon flux (15-150 keV) in 1 sec: 2.45406 ( -0.16137 0.16161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09727e-07 ( -1.7594e-08 1.5869e-08 ) ergs/cm2
Band function
Time interval is from 17.968 sec. to 18.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.927690 ( 0.92624 0.92624 )
beta : -1.22978 ( 1.22981 0.121446 )
Epeak [keV] : 68.5074 ( -67.4609 -67.4609 )
Norm@50keV : 3.75654E-02 ( -0.0144586 1.30735e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 55 degrees of freedom
# Null hypothesis probability = 5.444699e-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] : 18.4143 (-1.67514 1.88632)
R^2/D10^2 : 0.144387 (-0.0390891 0.0528416)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 105.71 using 59 PHA bins.
# Reduced chi-squared = 1.8545 for 57 degrees of freedom
# Null hypothesis probability = 9.436841e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.729e-09 1.328e-09
25- 50 4.576e-08 4.795e-09
50-150 1.133e-07 1.330e-08
15-150 1.687e-07 1.485e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 10.0083 (-0.661269 0.661235)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.19 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 57 degrees of freedom
# Null hypothesis probability = 7.297237e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.492e-08 1.825e-09
25- 50 4.795e-08 5.575e-09
50-150 1.052e-07 3.278e-08
15-150 1.780e-07 3.780e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.98201 (-1.34148 1.78758)
R1^2/D10^2 : 3.59936 (-2.13646 6.05882)
kT2 [keV] : 27.4800 (-4.25008 7.06647)
R2^2/D10^2 : 3.47448E-02 (-0.0181766 0.0260962)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.38 using 59 PHA bins.
# Reduced chi-squared = 0.9706 for 55 degrees of freedom
# Null hypothesis probability = 5.365981e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.137e-08 7.568e-09
25- 50 4.257e-08 1.026e-08
50-150 1.426e-07 2.991e-08
15-150 2.065e-07 4.145e-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: 1.38211 ( -0.0907628 0.0908322 )
Norm@50keV : 4.11622E-03 ( -0.000191961 0.000191339 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.51 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.077967e-01
Photon flux (15-150 keV) in 37.23 sec: 0.499281 ( -0.0234154 0.0234759 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48628e-06 ( -7.93695e-08 8.00043e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38307 ( -0.163536 0.0877752 )
Epeak [keV] : 9999.30 ( -9999.36 -9999.36 )
Norm@50keV : 4.12315E-03 ( -0.0001912 0.000867577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.55 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 56 degrees of freedom
# Null hypothesis probability = 9.122320e-02
Photon flux (15-150 keV) in 37.23 sec: 0.499203 ( -0.023481 0.023293 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48611e-06 ( -7.89686e-08 7.69395e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.985318 ( 0.983771 0.983771 )
beta : -1.39425 ( -0.118885 0.101643 )
Epeak [keV] : 69.8508 ( -70.4504 -70.4504 )
Norm@50keV : 7.85677E-03 ( -0.00286427 469671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.42 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 55 degrees of freedom
# Null hypothesis probability = 7.865955e-02
Photon flux (15-150 keV) in 37.23 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) = 4.30e-07
S(50-100 keV) = 6.63e-07
T90 vs. Hardness ratio plot
T90 = 145.908000022173 sec.
Hardness ratio (energy fluence ratio) = 1.54186
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37642
Count Ratio (50-100 keV) / (15-25 keV) = 1.13778
Mask shadow pattern
IMX = 2.266851828296420E-01, IMY = -1.239211919727717E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-94.435410 -12.868000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5197 -40.4898 5.2 49.4 -145.3 0.6094 2.2 3.9 Vela X-1
74.6377 9.2833 2.4 29.7 70.3 0.8533 4.9 ------ UNKNOWN
39.1517 -0.6456 2.5 46.8 15.4 1.1322 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-12.868000 24.364600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6107 -40.3593 37.2 49.4 -145.5 -0.0656 -0.3 12.3 Vela X-1
96.6791 11.9183 2.0 33.9 111.7 1.0030 5.8 ------ UNKNOWN
103.7800 -1.4947 2.5 26.9 138.7 0.4779 4.6 ------ UNKNOWN
70.4863 -11.2648 0.4 14.5 28.7 2.3872 31.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
60.964600 962.532400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6405 22.0244 0.5 35.7 99.0 35.2790 21.7 0.7 Crab
48.4703 -8.8567 2.3 21.8 -8.0 2.6294 4.9 ------ UNKNOWN
Plot creation:
Sun May 31 05:21:38 EDT 2015