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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
283.7106 20.6571 0.0153 41.1262 45.0049 2.3955611 12.611 TRIG_00280706
Foreground time interval of the image:
2.360 55.365 (delta_t = 53.005 [sec])
Background time interval of the image:
-239.336 2.360 (delta_t = 241.696 [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 2.360 sec. to 120.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36536 ( -0.159468 0.158217 )
Norm@50keV : 2.14590E-03 ( -0.000192854 0.000192726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.78 using 59 PHA bins.
# Reduced chi-squared = 0.9260 for 57 degrees of freedom
# Null hypothesis probability = 6.338731e-01
Photon flux (15-150 keV) in 118.5 sec: 0.259351 ( -0.0243602 0.0244445 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47516e-06 ( -2.42073e-07 2.43362e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.360 sec. to 120.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25987 ( -0.622048 0.216373 )
Epeak [keV] : 344.128 ( -548.256 -548.256 )
Norm@50keV : 2.41312E-03 ( -0.00231179 0.00218264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9429 for 56 degrees of freedom
# Null hypothesis probability = 5.967597e-01
Photon flux (15-150 keV) in 118.5 sec: 0.258576 ( -0.025154 0.024942 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46641e-06 ( -2.58496e-07 2.51137e-07 ) ergs/cm2
Band function
Time interval is from 2.360 sec. to 120.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.52317 ( -4.09061 -4.09061 )
beta : -1.43541 ( -0.21579 0.195167 )
Epeak [keV] : 32.1129 ( -42.7622 211.821 )
Norm@50keV : 0.262443 ( -0.25807 52.771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.06 using 59 PHA bins.
# Reduced chi-squared = 0.9465 for 55 degrees of freedom
# Null hypothesis probability = 5.878143e-01
Photon flux (15-150 keV) in 118.5 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] : 17.2456 (-2.10193 2.47714)
R^2/D10^2 : 1.84034E-02 (-0.00677573 0.0104615)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.61 using 59 PHA bins.
# Reduced chi-squared = 1.502 for 57 degrees of freedom
# Null hypothesis probability = 8.431427e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.316e-07 2.414e-08
25- 50 5.888e-07 8.662e-08
50-150 1.256e-06 2.166e-07
15-150 1.976e-06 2.388e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.07991 (-0.0975178 0.0975089)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.30 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.639416e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.186e-07 5.303e-08
25- 50 6.129e-07 1.821e-07
50-150 1.344e-06 6.477e-07
15-150 2.276e-06 9.103e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.73742 (-1.87966 2.30633)
R1^2/D10^2 : 0.190166 (-0.107556 0.301925)
kT2 [keV] : 32.9451 (-8.44414 21.87)
R2^2/D10^2 : 1.71906E-03 (-0.00132848 0.00179233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.67 using 59 PHA bins.
# Reduced chi-squared = 0.9395 for 55 degrees of freedom
# Null hypothesis probability = 6.025963e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.703e-07 1.166e-07
25- 50 6.008e-07 2.071e-07
50-150 1.625e-06 8.041e-07
15-150 2.496e-06 9.444e-07
Peak spectrum fit
Power-law model
Time interval is from 2.364 sec. to 3.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48690 ( -0.388513 0.406351 )
Norm@50keV : 1.17199E-02 ( -0.00293985 0.00290331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.94 using 59 PHA bins.
# Reduced chi-squared = 0.7358 for 57 degrees of freedom
# Null hypothesis probability = 9.323989e-01
Photon flux (15-150 keV) in 1 sec: 1.45802 ( -0.354741 0.355509 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11422e-07 ( -2.99829e-08 3.06823e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.364 sec. to 3.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.233517 ( -2.24767 0.980689 )
Epeak [keV] : 73.5259 ( -24.7206 -73.6775 )
Norm@50keV : 4.78420E-02 ( -0.0475464 0.44837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7156 for 56 degrees of freedom
# Null hypothesis probability = 9.465641e-01
Photon flux (15-150 keV) in 1 sec: 1.39679 ( -0.3643 0.36452 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05653e-07 ( -2.9794e-08 3.1484e-08 ) ergs/cm2
Band function
Time interval is from 2.364 sec. to 3.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.248695 ( -0.829766 3.02683 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 73.9313 ( -24.3975 261.407 )
Norm@50keV : 4.69772E-02 ( -0.046977 0.452064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7286 for 55 degrees of freedom
# Null hypothesis probability = 9.347107e-01
Photon flux (15-150 keV) in 1 sec: 1.42566 ( 5.57434 -0.3831 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08063e-07 ( -1.08056e-07 -3.28702e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.3955 (-3.97074 5.17587)
R^2/D10^2 : 0.129210 (-0.0797855 0.207049)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.74 using 59 PHA bins.
# Reduced chi-squared = 0.7322 for 57 degrees of freedom
# Null hypothesis probability = 9.354639e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.141e-09 3.172e-09
25- 50 3.067e-08 1.542e-08
50-150 5.816e-08 3.183e-08
15-150 9.597e-08 4.149e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-119.467 -199.363)
Norm : 6.03068 (-1.43939 1.44174)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.21 using 59 PHA bins.
# Reduced chi-squared = 0.7230 for 57 degrees of freedom
# Null hypothesis probability = 9.427647e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.502e-08 8.905e-09
25- 50 2.889e-08 1.724e-08
50-150 6.336e-08 3.696e-08
15-150 1.073e-07 6.355e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.40733 (-5.35973 43.9115)
R1^2/D10^2 : 2.58101 (-2.62205 12.1759)
kT2 [keV] : 20.0089 (-6.50224 -19.9534)
R2^2/D10^2 : 5.68315E-02 (-0.0573559 0.182797)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.31 using 59 PHA bins.
# Reduced chi-squared = 0.7147 for 55 degrees of freedom
# Null hypothesis probability = 9.454976e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.289e-08 7.715e-09
25- 50 2.855e-08 1.494e-08
50-150 6.525e-08 4.097e-08
15-150 1.067e-07 5.900e-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: 1.28533 ( -0.208975 0.20504 )
Norm@50keV : 3.05951E-03 ( -0.000360929 0.00036073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.81 using 59 PHA bins.
# Reduced chi-squared = 0.9089 for 57 degrees of freedom
# Null hypothesis probability = 6.695874e-01
Photon flux (15-150 keV) in 53 sec: 0.364039 ( -0.0453841 0.0455777 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60818e-06 ( -2.02905e-07 2.03985e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05788 ( -0.874156 0.411073 )
Epeak [keV] : 228.029 ( -228.029 -228.029 )
Norm@50keV : 3.90704E-03 ( -0.00390704 0.00571729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.55 using 59 PHA bins.
# Reduced chi-squared = 0.9206 for 56 degrees of freedom
# Null hypothesis probability = 6.437397e-01
Photon flux (15-150 keV) in 53 sec: 0.360377 ( -0.047014 0.046422 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59061e-06 ( -2.1518e-07 2.11809e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.188705 ( 0.643086 5.58309 )
beta : -1.37121 ( 1.36222 0.269719 )
Epeak [keV] : 56.4696 ( -54.9617 489.13 )
Norm@50keV : 1.47908E-02 ( -0.016838 226098 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.36 using 59 PHA bins.
# Reduced chi-squared = 0.9338 for 55 degrees of freedom
# Null hypothesis probability = 6.145531e-01
Photon flux (15-150 keV) in 53 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) = 5.71e-07
S(50-100 keV) = 8.87e-07
T90 vs. Hardness ratio plot
T90 = 108.90000000596 sec.
Hardness ratio (energy fluence ratio) = 1.55342
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.65728
Count Ratio (50-100 keV) / (15-25 keV) = 1.42125
Mask shadow pattern
IMX = 6.173643332742663E-01, IMY = -6.174707642141680E-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:
-239.336000 2.360000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6272 35.1907 0.0 20.2 88.5 0.1992 1.1 12.3 Her X-1
299.5831 35.1899 0.5 36.8 13.4 5.5720 24.6 0.8 Cyg X-1
308.1584 40.7693 5.0 37.7 -1.0 0.5653 2.3 11.2 Cyg X-3
326.2028 38.4959 4.5 49.5 -12.3 0.9715 2.6 10.6 Cyg X-2
308.1045 37.6299 2.1 39.8 2.8 1.3757 5.5 ------ UNKNOWN
172.2147 33.0295 3.4 59.0 -166.1 4.3210 3.4 ------ UNKNOWN
169.6595 34.4326 2.8 59.4 -163.2 5.8974 4.1 ------ UNKNOWN
355.9979 62.9228 3.8 47.2 -53.2 2.4709 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
2.360000 55.364590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6272 35.1907 0.0 20.2 88.5 0.0456 0.5 12.3 Her X-1
299.5772 35.2627 4.9 36.7 13.4 0.2375 2.3 3.7 Cyg X-1
307.9153 40.9264 5.7 37.5 -1.0 0.2190 2.0 9.0 Cyg X-3
326.2076 38.4884 25.5 49.5 -12.3 -0.0671 -0.5 10.1 Cyg X-2
283.7106 20.6569 0.9 41.1 45.0 2.3965 12.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
119.764590 962.695400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6925 35.3821 0.0 29.4 173.0 0.9829 1.8 11.7 Her X-1
268.3412 -1.5500 3.6 26.8 82.8 2.1850 3.2 6.1 SW J1753.5-0127
274.0109 -13.9929 6.4 35.9 63.0 1.9037 1.8 2.6 GX 17+2
285.0052 -24.8913 33.0 45.5 45.1 -0.6799 -0.3 2.4 HT1900.1-2455
288.8019 10.9414 0.4 10.8 19.3 13.5321 32.5 0.3 GRS 1915+105
299.5878 35.2038 0.3 20.2 -93.0 21.5218 43.2 0.2 Cyg X-1
308.1139 40.8725 5.5 28.9 -93.2 1.4243 2.1 4.8 Cyg X-3
326.1916 38.1987 143.0 40.5 -78.5 0.1583 0.1 7.4 Cyg X-2
241.7182 32.8392 3.2 39.2 163.8 2.8196 3.6 ------ UNKNOWN
231.8822 53.9187 2.6 51.3 -169.7 5.2349 4.4 ------ UNKNOWN
308.0453 37.6448 1.7 27.1 -87.6 4.6985 6.7 ------ UNKNOWN
260.9025 62.4645 3.0 44.7 -148.1 3.7551 3.8 ------ UNKNOWN
320.0019 50.1699 3.7 41.1 -98.1 8.5394 3.2 ------ UNKNOWN
334.3820 20.8546 3.8 47.1 -53.1 7.0845 3.1 ------ UNKNOWN
324.4091 43.8302 4.2 40.9 -87.4 6.3642 2.8 ------ UNKNOWN
Plot creation:
Sun May 31 10:04:51 EDT 2015