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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
305.3551 34.9774 0.0159 20.9843 85.9116 1.3505782 12.045 TRIG_00555413
Foreground time interval of the image:
10.152 58.728 (delta_t = 48.576 [sec])
Background time interval of the image:
-567.599 -553.259 (delta_t = 14.340 [sec])
-239.000 10.152 (delta_t = 249.152 [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 64.000000
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 64.000000
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 64.000000
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)
The mask-weighted light curves based on cleaned DPHs
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 10.152 sec. to 58.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84532 ( -0.24275 0.256309 )
Norm@50keV : 1.37536E-03 ( -0.000234634 0.000228556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.545541e-01
Photon flux (15-150 keV) in 48.58 sec: 0.192955 ( -0.0261261 0.0261262 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14391e-07 ( -1.0289e-07 1.06369e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.152 sec. to 58.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18247 ( -1.64388 0.945351 )
Epeak [keV] : 48.3999 ( )
Norm@50keV : 3.45724E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.494813e-01
Photon flux (15-150 keV) in 48.58 sec: 0.188094 ( -0.026837 0.027553 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60443e-07 ( -1.25973e-07 1.40804e-07 ) ergs/cm2
Band function
Time interval is from 10.152 sec. to 58.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90647 ( -14.1269 -4.90647 )
beta : -2.10328 ( -0.500665 0.330331 )
Epeak [keV] : 24.8528 ( -7.63208 4.61475 )
Norm@50keV : 184.425 ( -24.7356 3963.15 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 55 degrees of freedom
# Null hypothesis probability = 4.849730e-01
Photon flux (15-150 keV) in 48.58 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] : 9.79286 (-1.3971 1.66182)
R^2/D10^2 : 9.95919E-02 (-0.0447207 0.0789606)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.00 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.723936e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.379e-08 2.176e-08
25- 50 2.263e-07 4.501e-08
50-150 1.111e-07 4.049e-08
15-150 4.313e-07 8.662e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.4275 (-29.6536 68.4107)
Norm : 0.912242 (-0.169333 0.217699)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 0.9938 for 57 degrees of freedom
# Null hypothesis probability = 4.882841e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.149e-07 2.077e-08
25- 50 1.889e-07 3.121e-08
50-150 2.653e-07 1.497e-07
15-150 5.692e-07 1.782e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.32771 (-2.97585 1.72536)
R1^2/D10^2 : 0.166374 (-0.0606031 0.407648)
kT2 [keV] : 79.2106 (-72.0728 -87.0904)
R2^2/D10^2 : 8.00769E-05 (-5.04045e-05 0.0137437)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.59 using 59 PHA bins.
# Reduced chi-squared = 0.9926 for 55 degrees of freedom
# Null hypothesis probability = 4.900815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.061e-07 3.691e-08
25- 50 2.097e-07 7.306e-08
50-150 3.072e-07 1.860e-07
15-150 6.230e-07 2.377e-07
Peak spectrum fit
Power-law model
Time interval is from 11.052 sec. to 12.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27152 ( -0.562685 0.53259 )
Norm@50keV : 5.02853E-03 ( -0.00146726 0.00146044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7329 for 57 degrees of freedom
# Null hypothesis probability = 9.348790e-01
Photon flux (15-150 keV) in 1 sec: 0.596883 ( -0.176162 0.176818 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.00451e-08 ( -1.62872e-08 1.67878e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.052 sec. to 12.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27657 ( -0.83675 0.529042 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 5.03359E-03 ( -0.00147683 0.0450575 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7461 for 56 degrees of freedom
# Null hypothesis probability = 9.212436e-01
Photon flux (15-150 keV) in 1 sec: 0.597264 ( -0.176786 0.175857 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9743e-08 ( -1.70714e-08 1.68933e-08 ) ergs/cm2
Band function
Time interval is from 11.052 sec. to 12.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91218 ( -4.91218 -4.91218 )
beta : -1.41144 ( -0.87592 0.643366 )
Epeak [keV] : 27.5338 ( -27.5338 65.4362 )
Norm@50keV : 221.366 ( -63.7106 2.97356e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.44 using 59 PHA bins.
# Reduced chi-squared = 0.7534 for 55 degrees of freedom
# Null hypothesis probability = 9.119589e-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] : 17.2142 (-6.29927 11.365)
R^2/D10^2 : 4.28094E-02 (-0.0422176 0.155108)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8007 for 57 degrees of freedom
# Null hypothesis probability = 8.600720e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.575e-09 1.639e-09
25- 50 1.150e-08 6.810e-09
50-150 2.444e-08 1.596e-08
15-150 3.852e-08 2.477e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-117.86 -199.363)
Norm : 2.45366 (-0.720147 0.720142)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 57 degrees of freedom
# Null hypothesis probability = 9.208067e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.110e-09 3.843e-09
25- 50 1.175e-08 7.335e-09
50-150 2.578e-08 1.556e-08
15-150 4.364e-08 2.679e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.89102 (-3.98368 9.91979)
R1^2/D10^2 : 0.671916 (-0.593182 13.1838)
kT2 [keV] : 34.9090 (-38.5098 -38.51)
R2^2/D10^2 : 3.52759E-03 (-0.00272464 0.0457609)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.55 using 59 PHA bins.
# Reduced chi-squared = 0.7554 for 55 degrees of freedom
# Null hypothesis probability = 9.099518e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.651e-09 3.653e-09
25- 50 1.068e-08 5.990e-09
50-150 3.287e-08 2.030e-08
15-150 4.920e-08 2.633e-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: 1.84532 ( -0.24275 0.256309 )
Norm@50keV : 1.37536E-03 ( -0.000234634 0.000228556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.545541e-01
Photon flux (15-150 keV) in 48.58 sec: 0.192955 ( -0.0261261 0.0261262 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14391e-07 ( -1.0289e-07 1.06369e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18247 ( -1.64388 0.992233 )
Epeak [keV] : 48.3999 ( )
Norm@50keV : 3.45724E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.494813e-01
Photon flux (15-150 keV) in 48.58 sec: 0.188094 ( -0.026837 0.027553 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60443e-07 ( -1.25973e-07 1.40804e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90647 ( -13.9272 -4.90647 )
beta : -2.10328 ( -0.500665 0.330331 )
Epeak [keV] : 24.8528 ( -7.63208 4.61475 )
Norm@50keV : 184.425 ( -24.7356 3963.15 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 55 degrees of freedom
# Null hypothesis probability = 4.849730e-01
Photon flux (15-150 keV) in 48.58 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) = 1.76e-07
S(50-100 keV) = 1.96e-07
T90 vs. Hardness ratio plot
T90 = 42.9120000600815 sec.
Hardness ratio (energy fluence ratio) = 1.11364
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.1916
Count Ratio (50-100 keV) / (15-25 keV) = 0.55087
Mask shadow pattern
IMX = 2.734536579764521E-02, IMY = -3.825728259447613E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-567.599400 -553.259400
-239.000000 10.152000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.8091 35.1423 4.3 25.0 91.6 0.8018 2.7 11.3 Cyg X-1
308.0677 40.9408 1.3 16.9 100.9 2.0216 8.6 2.1 Cyg X-3
326.0207 38.1469 0.0 5.5 50.0 0.4481 2.3 12.7 Cyg X-2
342.8144 20.3716 2.6 24.2 -20.9 0.9573 4.4 ------ UNKNOWN
95.2446 74.1356 3.2 57.8 -156.7 5.1245 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
10.152000 58.728000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.4789 35.0519 11.7 25.2 91.7 0.1303 1.0 10.5 Cyg X-1
307.8967 40.9504 10.8 17.0 101.1 -0.0982 -1.1 9.7 Cyg X-3
326.1504 38.2376 8.0 5.3 49.7 -0.1231 -1.4 5.1 Cyg X-2
305.3550 34.9773 1.0 21.0 85.9 1.3506 12.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
114.900600 570.400610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3255 35.2552 60.8 41.3 126.0 0.2557 0.2 8.3 Her X-1
288.8238 10.9324 1.0 28.3 56.3 5.7385 11.4 1.7 GRS 1915+105
299.5787 35.1876 1.7 4.7 114.8 2.1317 6.7 1.0 Cyg X-1
308.0659 40.9587 1.3 6.4 -140.9 3.1267 9.0 2.0 Cyg X-3
326.2106 38.3247 6.1 17.0 -87.3 0.6709 1.9 1.8 Cyg X-2
225.8305 66.3405 2.8 54.2 171.1 7.3603 4.2 ------ UNKNOWN
318.8863 -19.9374 2.2 56.4 4.9 8.6858 5.2 ------ UNKNOWN
235.6136 75.5145 2.5 51.3 -177.3 4.5656 4.6 ------ UNKNOWN
208.7522 78.1105 3.7 57.2 -173.9 5.9296 3.1 ------ UNKNOWN
336.5224 -14.6470 3.1 57.7 -16.1 5.5957 3.7 ------ UNKNOWN
118.7408 86.2517 5.1 58.8 -159.3 6.3822 2.2 ------ UNKNOWN
354.8777 75.3146 3.2 46.5 -144.3 2.8955 3.6 ------ UNKNOWN
351.2727 12.4823 3.0 47.1 -53.0 6.4597 3.9 ------ UNKNOWN
Plot creation:
Sat May 30 16:56:49 EDT 2015