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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
131.6746 -48.8959 0.0176 20.0977 65.9568 1.4338336 10.954 TRIG_00623368
Foreground time interval of the image:
6.056 64.680 (delta_t = 58.624 [sec])
Background time interval of the image:
-239.000 6.056 (delta_t = 245.056 [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 6.056 sec. to 64.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60502 ( -0.175265 0.178122 )
Norm@50keV : 1.73961E-03 ( -0.000205705 0.000204003 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.37 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.853684e-01
Photon flux (15-150 keV) in 58.62 sec: 0.223895 ( -0.0247396 0.0247536 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.53161e-07 ( -1.19817e-07 1.21707e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.056 sec. to 64.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.24808E-02 ( -1.12314 0.890548 )
Epeak [keV] : 54.2378 ( -8.44761 17.2256 )
Norm@50keV : 1.42550E-02 ( -0.0142558 0.0465513 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9766 for 56 degrees of freedom
# Null hypothesis probability = 5.246134e-01
Photon flux (15-150 keV) in 58.62 sec: 0.212997 ( -0.025137 0.025245 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.25076e-07 ( -1.22416e-07 1.32581e-07 ) ergs/cm2
Band function
Time interval is from 6.056 sec. to 64.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.25035E-02 ( -0.779187 1.03803 )
beta : -10.0000 ( 10 1.95399e-14 )
Epeak [keV] : 54.2271 ( -7.92225 17.2464 )
Norm@50keV : 1.42577E-02 ( -0.0142577 0.0466401 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9943 for 55 degrees of freedom
# Null hypothesis probability = 4.864970e-01
Photon flux (15-150 keV) in 58.62 sec: 0.212988 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.50266e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4316 (-1.38928 1.60156)
R^2/D10^2 : 5.13588E-02 (-0.0184746 0.0278836)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.860314e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.862e-08 2.040e-08
25- 50 3.233e-07 4.751e-08
50-150 3.074e-07 7.407e-08
15-150 7.294e-07 1.052e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.253 (-50.7514 -138.766)
Norm : 0.943556 (-0.114463 0.139846)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.315368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.428e-07 4.326e-08
25- 50 2.621e-07 1.102e-07
50-150 5.027e-07 2.933e-07
15-150 9.076e-07 3.653e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.10916 (-3.3198 3.54469)
R1^2/D10^2 : 0.140777 (-0.0828494 0.401965)
kT2 [keV] : 20.2179 (-11.6247 68.3366)
R2^2/D10^2 : 5.39968E-03 (-0.00535894 0.017024)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.38 using 59 PHA bins.
# Reduced chi-squared = 0.9706 for 55 degrees of freedom
# Null hypothesis probability = 5.366695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.239e-07 6.988e-08
25- 50 3.022e-07 1.682e-07
50-150 4.268e-07 2.244e-07
15-150 8.529e-07 4.273e-07
Peak spectrum fit
Power-law model
Time interval is from 26.324 sec. to 27.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14673 ( -0.548754 0.668697 )
Norm@50keV : 3.17762E-03 ( -0.00153036 0.00152652 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.87 using 59 PHA bins.
# Reduced chi-squared = 0.8924 for 57 degrees of freedom
# Null hypothesis probability = 7.031567e-01
Photon flux (15-150 keV) in 1 sec: 0.511527 ( -0.186906 0.187454 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95712e-08 ( -1.24752e-08 1.36072e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.324 sec. to 27.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.15450 ( 1.19587 2.8009 )
Epeak [keV] : 34.9768 ( -11.1789 15.7411 )
Norm@50keV : 0.379899 ( -0.444962 1.27105e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.49 using 59 PHA bins.
# Reduced chi-squared = 0.8301 for 56 degrees of freedom
# Null hypothesis probability = 8.136693e-01
Photon flux (15-150 keV) in 1 sec: 0.519839 ( -0.177864 0.179861 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62405e-08 ( -1.01797e-08 1.16544e-08 ) ergs/cm2
Band function
Time interval is from 26.324 sec. to 27.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.48742 -5 )
beta : -3.33010 ( 3.3305 1.17066 )
Epeak [keV] : 28.6440 ( -7.75897 8.23413 )
Norm@50keV : 311.860 ( -102.81 1982.44 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.25 using 59 PHA bins.
# Reduced chi-squared = 0.8410 for 55 degrees of freedom
# Null hypothesis probability = 7.933987e-01
Photon flux (15-150 keV) in 1 sec: 0.527277 ( 6.47272 -0.186707 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71908e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.94357 (-2.51173 3.38109)
R^2/D10^2 : 0.429569 (-0.429569 1.09646)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.54 using 59 PHA bins.
# Reduced chi-squared = 0.8164 for 57 degrees of freedom
# Null hypothesis probability = 8.373854e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.668e-09 4.168e-09
25- 50 1.403e-08 8.500e-09
50-150 5.251e-09 3.889e-09
15-150 2.595e-08 1.594e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.5524 (-23.0795 71.3955)
Norm : 3.29457 (-1.44839 2.43682)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.60 using 59 PHA bins.
# Reduced chi-squared = 0.8527 for 57 degrees of freedom
# Null hypothesis probability = 7.779613e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.822e-09 4.923e-09
25- 50 1.076e-08 6.685e-09
50-150 9.327e-09 7.975e-09
15-150 2.791e-08 1.899e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48284 (-6.54597 -6.54597)
R1^2/D10^2 : 0.483318 (-0.506546 -0.506546)
kT2 [keV] : 10.2667 (-10.4545 189.521)
R2^2/D10^2 : 0.179902 (-0.156261 -0.156261)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.47 using 59 PHA bins.
# Reduced chi-squared = 0.8448 for 55 degrees of freedom
# Null hypothesis probability = 7.868759e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.887e-09 3.696e-07
25- 50 1.356e-08 3.668e-06
50-150 6.093e-09 3.381e-05
15-150 2.654e-08 3.360e-05
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: 1.60502 ( -0.175265 0.178122 )
Norm@50keV : 1.73961E-03 ( -0.000205705 0.000204003 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.37 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.853684e-01
Photon flux (15-150 keV) in 58.62 sec: 0.223895 ( -0.0247396 0.0247536 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.53161e-07 ( -1.19817e-07 1.21707e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.24808E-02 ( -1.12314 0.890548 )
Epeak [keV] : 54.2378 ( -8.44761 17.2256 )
Norm@50keV : 1.42550E-02 ( -0.0142558 0.0465513 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9766 for 56 degrees of freedom
# Null hypothesis probability = 5.246134e-01
Photon flux (15-150 keV) in 58.62 sec: 0.212997 ( -0.025137 0.025245 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.25076e-07 ( -1.22416e-07 1.32581e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.25035E-02 ( -0.779187 1.03803 )
beta : -10.0000 ( 10 4.9738e-14 )
Epeak [keV] : 54.2271 ( -7.92225 17.2464 )
Norm@50keV : 1.42577E-02 ( -0.0142577 0.0466401 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9943 for 55 degrees of freedom
# Null hypothesis probability = 4.864970e-01
Photon flux (15-150 keV) in 58.62 sec: 0.212988 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.50266e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.48e-07
S(50-100 keV) = 3.26e-07
T90 vs. Hardness ratio plot
T90 = 49.0879999995232 sec.
Hardness ratio (energy fluence ratio) = 1.31452
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.62489
Count Ratio (50-100 keV) / (15-25 keV) = 1.0103
Mask shadow pattern
IMX = 1.490781412126486E-01, IMY = -3.341563400959436E-01
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 6.056000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4557 -40.7513 0.0 24.8 84.9 0.6168 1.7 12.3 Vela X-1
170.2589 -60.6566 1.5 4.6 -116.7 1.9247 7.9 2.6 Cen X-3
186.5106 -62.7968 2.0 12.5 -107.8 1.3545 5.9 4.3 GX 301-2
171.0256 -9.6052 2.4 50.6 149.3 6.2049 4.8 ------ UNKNOWN
169.6193 -17.1487 2.7 42.9 148.6 2.6864 4.3 ------ UNKNOWN
178.3621 -13.3757 2.7 48.0 159.4 3.2106 4.2 ------ UNKNOWN
35.6032 -57.7234 2.2 55.1 -11.3 3.8517 5.2 ------ UNKNOWN
323.1878 -71.8634 2.2 47.9 -50.7 5.5100 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
6.056000 64.680000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6317 -40.4061 5.6 25.0 85.6 -0.3284 -2.1 10.1 Vela X-1
170.3524 -60.4522 6.4 4.6 -119.4 0.1902 1.8 10.3 Cen X-3
186.7299 -62.7751 3.3 12.6 -108.0 -0.3634 -3.5 2.0 GX 301-2
90.9759 -47.9042 2.7 41.0 30.9 0.8740 4.3 ------ UNKNOWN
131.6747 -48.8959 1.1 20.1 66.0 1.4338 11.0 ------ UNKNOWN
170.9116 -41.0083 2.7 19.6 159.0 0.4150 4.3 ------ UNKNOWN
40.9499 -80.1244 2.7 36.2 -28.7 0.5551 4.3 ------ UNKNOWN
214.9057 -36.1717 2.6 41.3 -143.2 0.7777 4.4 ------ UNKNOWN
222.5152 -61.7894 2.0 28.9 -102.2 0.7915 5.7 ------ UNKNOWN
242.4844 -54.6694 2.1 41.5 -102.7 2.2884 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
114.900600 963.014200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3294 -40.5895 10.5 8.7 134.9 0.6917 1.1 9.3 Vela X-1
170.3374 -60.6165 1.5 24.7 -111.1 5.7401 7.7 0.7 Cen X-3
186.7635 -62.6661 4.2 32.6 -108.2 2.9722 2.8 6.9 GX 301-2
50.1470 -40.5634 3.8 55.7 1.6 9.7065 3.0 ------ UNKNOWN
44.2272 -42.3414 3.5 58.0 -3.3 13.8634 3.3 ------ UNKNOWN
149.6663 -48.2358 3.6 11.9 -150.3 1.8101 3.2 ------ UNKNOWN
128.3648 -62.1663 2.3 13.4 -57.2 3.0303 5.0 ------ UNKNOWN
24.0355 -56.5301 4.6 58.7 -25.9 11.2422 2.6 ------ UNKNOWN
Plot creation:
Thu May 28 13:44:25 EDT 2015