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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
353.2006 -10.6103 0.0041 26.5164 -36.6891 2.8026076 47.056 TRIG_00359711
Foreground time interval of the image:
-5.440 12.413 (delta_t = 17.853 [sec])
Background time interval of the image:
-239.888 -5.440 (delta_t = 234.448 [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 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 -5.440 sec. to 113.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21816 ( -0.0501944 0.0499509 )
Norm@50keV : 4.75791E-03 ( -0.000123078 0.000122919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.52 using 59 PHA bins.
# Reduced chi-squared = 0.9039 for 57 degrees of freedom
# Null hypothesis probability = 6.799890e-01
Photon flux (15-150 keV) in 119.3 sec: 0.559952 ( -0.01569 0.0157477 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72962e-06 ( -1.55739e-07 1.56081e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.440 sec. to 113.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21638 ( -0.0527605 0.0482875 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.77771E-03 ( -0.000122479 0.000503076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.62 using 59 PHA bins.
# Reduced chi-squared = 0.9218 for 56 degrees of freedom
# Null hypothesis probability = 6.412852e-01
Photon flux (15-150 keV) in 119.3 sec: 0.559673 ( -0.015682 0.01572 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72314e-06 ( -1.49662e-07 1.596e-07 ) ergs/cm2
Band function
Time interval is from -5.440 sec. to 113.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92750 ( -4.9275 -4.9275 )
beta : -1.23090 ( -0.051789 0.0517005 )
Epeak [keV] : 23.0480 ( -23.048 3.98498 )
Norm@50keV : 549.193 ( -13.9961 989707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.62 using 59 PHA bins.
# Reduced chi-squared = 0.9204 for 55 degrees of freedom
# Null hypothesis probability = 6.424167e-01
Photon flux (15-150 keV) in 119.3 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] : 20.3316 ( )
R^2/D10^2 : 2.33538E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 384.51 using 59 PHA bins.
# Reduced chi-squared = 6.7458 for 57 degrees of freedom
# Null hypothesis probability = 4.165889e-50
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.205e-07 1.288e-08
25- 50 1.111e-06 4.647e-08
50-150 3.410e-06 1.420e-07
15-150 4.742e-06 1.491e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.38656 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 203.55 using 59 PHA bins.
# Reduced chi-squared = 3.5711 for 57 degrees of freedom
# Null hypothesis probability = 2.430476e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.090e-07 2.112e-08
25- 50 1.364e-06 4.116e-08
50-150 2.991e-06 8.590e-08
15-150 5.064e-06 1.455e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.65220 (-0.831274 0.895605)
R1^2/D10^2 : 0.256161 (-0.0682705 0.100434)
kT2 [keV] : 39.0562 (-4.61756 6.6234)
R2^2/D10^2 : 2.48906E-03 (-0.000907076 0.00117782)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.23 using 59 PHA bins.
# Reduced chi-squared = 0.9677 for 55 degrees of freedom
# Null hypothesis probability = 5.427103e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.953e-07 4.223e-08
25- 50 1.273e-06 7.152e-08
50-150 4.030e-06 3.066e-07
15-150 5.798e-06 3.358e-07
Peak spectrum fit
Power-law model
Time interval is from 26.824 sec. to 27.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.862179 ( -0.104912 0.103147 )
Norm@50keV : 3.09051E-02 ( -0.00177817 0.00177152 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.04 using 59 PHA bins.
# Reduced chi-squared = 0.7551 for 57 degrees of freedom
# Null hypothesis probability = 9.144651e-01
Photon flux (15-150 keV) in 1 sec: 3.54718 ( -0.202887 0.203138 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52052e-07 ( -2.19207e-08 2.20251e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.824 sec. to 27.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.858924 ( -0.188478 0.101447 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.11098E-02 ( -0.00176925 0.00619751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.07 using 59 PHA bins.
# Reduced chi-squared = 0.7691 for 56 degrees of freedom
# Null hypothesis probability = 8.973409e-01
Photon flux (15-150 keV) in 1 sec: 3.54796 ( -0.20477 0.20134 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51805e-07 ( -2.1514e-08 2.2229e-08 ) ergs/cm2
Band function
Time interval is from 26.824 sec. to 27.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.844424 ( 0.844424 0.844424 )
beta : -0.862179 ( -0.103098 0.105037 )
Epeak [keV] : 16.0898 ( -16.0898 -16.0898 )
Norm@50keV : 4.39786E-02 ( -0.0148335 852350 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.04 using 59 PHA bins.
# Reduced chi-squared = 0.7825 for 55 degrees of freedom
# Null hypothesis probability = 8.791036e-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] : 25.2774 (-2.12072 2.41501)
R^2/D10^2 : 8.50628E-02 (-0.0200151 0.0253866)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 101.82 using 59 PHA bins.
# Reduced chi-squared = 1.7863 for 57 degrees of freedom
# Null hypothesis probability = 2.441241e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.386e-09 1.169e-09
25- 50 5.355e-08 4.825e-09
50-150 2.533e-07 2.400e-08
15-150 3.162e-07 2.330e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 13.8957 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 161.40 using 59 PHA bins.
# Reduced chi-squared = 2.8316 for 57 degrees of freedom
# Null hypothesis probability = 6.450841e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.460e-08 2.175e-09
25- 50 6.656e-08 7.845e-09
50-150 1.460e-07 3.830e-08
15-150 2.471e-07 4.030e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.64276 (-1.71897 2.32884)
R1^2/D10^2 : 1.77050 (-0.982792 2.46077)
kT2 [keV] : 38.8152 (-6.52971 12.6583)
R2^2/D10^2 : 2.19293E-02 (-0.0118513 0.0157953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.99 using 59 PHA bins.
# Reduced chi-squared = 0.7816 for 55 degrees of freedom
# Null hypothesis probability = 8.803029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.239e-08 7.529e-09
25- 50 5.856e-08 1.136e-08
50-150 2.776e-07 5.965e-08
15-150 3.586e-07 7.165e-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: 1.11445 ( -0.0650901 0.0645222 )
Norm@50keV : 1.06225E-02 ( -0.000363156 0.000362313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.38 using 59 PHA bins.
# Reduced chi-squared = 0.9891 for 57 degrees of freedom
# Null hypothesis probability = 4.982892e-01
Photon flux (15-150 keV) in 17.85 sec: 1.23392 ( -0.0443147 0.0445001 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97341e-06 ( -7.14627e-08 7.17343e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10948 ( -0.101429 0.114753 )
Epeak [keV] : 9998.92 ( )
Norm@50keV : 1.06779E-02 ( -0.000359006 0.00102001 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.52 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 56 degrees of freedom
# Null hypothesis probability = 4.555003e-01
Photon flux (15-150 keV) in 17.85 sec: 1.23497 ( -0.04528 0.04297 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97098e-06 ( -6.92402e-08 7.06325e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.335677 ( 0.617302 0.617302 )
beta : -1.13172 ( -0.0859925 0.074724 )
Epeak [keV] : 59.9460 ( -59.6907 168.009 )
Norm@50keV : 3.68866E-02 ( -0.0375566 501469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.427487e-01
Photon flux (15-150 keV) in 17.85 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) = 1.22e-06
S(50-100 keV) = 2.09e-06
T90 vs. Hardness ratio plot
T90 = 74.4959999918938 sec.
Hardness ratio (energy fluence ratio) = 1.71311
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.60535
Count Ratio (50-100 keV) / (15-25 keV) = 1.43637
Mask shadow pattern
IMX = 4.000946854737244E-01, IMY = 2.981031347701597E-01
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:
-239.888000 -5.440000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8472 11.0122 4.9 41.1 136.3 1.3139 2.4 4.9 GRS 1915+105
299.5852 35.1962 0.5 44.5 174.7 8.1539 21.2 0.4 Cyg X-1
308.1010 40.9352 3.4 45.1 -172.8 1.2289 3.4 1.1 Cyg X-3
326.1336 38.3503 4.8 38.5 -154.0 0.7256 2.4 2.5 Cyg X-2
326.7038 -14.0430 2.8 14.1 37.2 0.8042 4.1 ------ UNKNOWN
322.3076 7.4779 2.5 9.9 169.4 0.8512 4.6 ------ UNKNOWN
349.8392 16.1781 2.6 26.5 -99.8 1.1320 4.4 ------ UNKNOWN
321.3945 54.1162 2.3 54.6 -156.0 3.5816 5.0 ------ UNKNOWN
354.5164 37.2697 2.4 44.4 -121.1 4.7078 4.8 ------ UNKNOWN
8.2062 11.0605 3.1 40.8 -78.0 3.0376 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.440000 12.412590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8113 10.9378 4.2 41.2 136.1 -0.3742 -2.7 0.9 GRS 1915+105
299.5911 35.3807 23.7 44.7 174.9 -0.0485 -0.5 10.7 Cyg X-1
308.1139 40.9047 4.0 45.1 -172.8 -0.2719 -2.9 2.9 Cyg X-3
326.4283 38.2562 0.0 38.4 -153.6 -0.1371 -1.8 12.7 Cyg X-2
295.7883 32.1724 2.7 44.8 168.5 0.4371 4.2 ------ UNKNOWN
347.6830 -17.5540 2.3 25.5 -16.8 0.2845 5.0 ------ UNKNOWN
353.2006 -10.6103 0.2 26.5 -36.7 2.8027 47.1 ------ UNKNOWN
312.9077 47.2515 2.1 49.3 -164.9 0.6484 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
65.612600 962.222000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.1496 38.3443 41.2 55.1 165.8 0.8708 0.3 1.7 Cyg X-2
26.2690 19.4009 4.4 44.3 -120.9 6.1408 2.6 ------ UNKNOWN
23.7158 27.1608 3.4 48.0 -130.9 7.7839 3.4 ------ UNKNOWN
Plot creation:
Sun May 31 03:12:38 EDT 2015