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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
300.1809 9.1311 0.0114 27.0509 3.0420 0.9011650 16.864 TRIG_00132247
Foreground time interval of the image:
-11.368 16.533 (delta_t = 27.901 [sec])
Background time interval of the image:
-101.867 -11.368 (delta_t = 90.499 [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 -11.368 sec. to 36.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91624 ( -0.174385 0.181448 )
Norm@50keV : 1.38378E-03 ( -0.000158554 0.000155186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.17 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.898920e-01
Photon flux (15-150 keV) in 48 sec: 0.199969 ( -0.0189675 0.0189776 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10776e-07 ( -6.76886e-08 6.87254e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.368 sec. to 36.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79684 ( -0.836389 0.474352 )
Epeak [keV] : 73.3808 ( -71.2407 -73.5825 )
Norm@50keV : 1.61792E-03 ( -0.000917926 0.00320143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.09 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 56 degrees of freedom
# Null hypothesis probability = 1.675848e-01
Photon flux (15-150 keV) in 48 sec: 0.198981 ( -0.019873 0.019585 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.03288e-07 ( -8.25888e-08 7.48512e-08 ) ergs/cm2
Band function
Time interval is from -11.368 sec. to 36.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31080 ( 1.32136 5.86321 )
beta : -2.11865 ( 2.11254 0.344538 )
Epeak [keV] : 42.4545 ( -42.7524 94.583 )
Norm@50keV : 3.23656E-03 ( -0.00191024 334.159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.41 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Null hypothesis probability = 1.589377e-01
Photon flux (15-150 keV) in 48 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] : 10.3688 (-1.087 1.22737)
R^2/D10^2 : 8.08055E-02 (-0.0281651 0.0426241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.82 using 59 PHA bins.
# Reduced chi-squared = 1.558 for 57 degrees of freedom
# Null hypothesis probability = 4.441037e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.590e-08 1.526e-08
25- 50 2.246e-07 2.791e-08
50-150 1.300e-07 3.079e-08
15-150 4.405e-07 5.016e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.2990 (-21.5567 37.0318)
Norm : 0.941100 (-0.133279 0.164264)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.09 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.695766e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.170e-07 1.642e-08
25- 50 1.917e-07 1.901e-08
50-150 2.667e-07 1.084e-07
15-150 5.754e-07 1.042e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.30102 (-1.94206 1.45844)
R1^2/D10^2 : 0.164742 (-0.069905 0.0835894)
kT2 [keV] : 53.8096 (-35.5748 -57.5656)
R2^2/D10^2 : 1.76696E-04 (-0.000135296 0.00289701)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.80 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 55 degrees of freedom
# Null hypothesis probability = 1.151861e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.037e-07 2.198e-08
25- 50 2.071e-07 4.793e-08
50-150 2.992e-07 1.544e-07
15-150 6.099e-07 2.095e-07
Peak spectrum fit
Power-law model
Time interval is from 12.132 sec. to 13.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11048 ( -0.885201 1.28118 )
Norm@50keV : 1.66970E-03 ( -0.0016697 0.00107546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.99 using 59 PHA bins.
# Reduced chi-squared = 0.9823 for 57 degrees of freedom
# Null hypothesis probability = 5.128489e-01
Photon flux (15-150 keV) in 1 sec: 0.264053 ( -0.127087 0.127104 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55293e-08 ( -8.86162e-09 9.88093e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.132 sec. to 13.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59478 ( )
Epeak [keV] : 31.5476 ( )
Norm@50keV : 3.40076E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 0.9990 for 56 degrees of freedom
# Null hypothesis probability = 4.769273e-01
Photon flux (15-150 keV) in 1 sec: 0.261065 ( -0.127829 0.128491 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48213e-08 ( -8.50709e-09 1.04274e-08 ) ergs/cm2
Band function
Time interval is from 12.132 sec. to 13.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.29251 ( 9.39159 8.29251 )
beta : -2.11049 ( -1.28101 0.885305 )
Epeak [keV] : 67.8306 ( -67.8306 -67.8306 )
Norm@50keV : 0.226934 ( -0.226934 0.146171 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.99 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.373395e-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] : 10.8753 (-6.87018 7.81105)
R^2/D10^2 : 9.08874E-02 (-0.0907784 4.91034)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.09 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.718930e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.241e-09 1.523e-09
25- 50 6.243e-09 4.091e-09
50-150 4.134e-09 3.520e-09
15-150 1.262e-08 8.645e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.1927 (-55.1927 -55.1927)
Norm : 1.45141 (-0.839302 2.84378)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.96 using 59 PHA bins.
# Reduced chi-squared = 0.9818 for 57 degrees of freedom
# Null hypothesis probability = 5.140493e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.594e-09 2.316e-09
25- 50 5.326e-09 3.486e-09
50-150 5.643e-09 4.961e-09
15-150 1.456e-08 1.101e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.58764 (-3.56365 10.8887)
R1^2/D10^2 : 5.32759 (-5.42146 -5.42146)
kT2 [keV] : 14.3089 (-6.475 -14.275)
R2^2/D10^2 : 2.55481E-02 (-0.0257818 0.369608)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.671400e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.891e-09 2.448e-09
25- 50 4.919e-09 3.072e-09
50-150 5.714e-09 5.265e-09
15-150 1.452e-08 8.345e-09
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: 1.82800 ( -0.178746 0.185223 )
Norm@50keV : 1.83008E-03 ( -0.000208311 0.000204123 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.22 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.467873e-01
Photon flux (15-150 keV) in 27.9 sec: 0.254971 ( -0.0251477 0.0251732 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69669e-07 ( -5.34793e-08 5.42189e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76258 ( -0.79306 0.777889 )
Epeak [keV] : 162.818 ( )
Norm@50keV : 1.98883E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.20 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 56 degrees of freedom
# Null hypothesis probability = 1.271636e-01
Photon flux (15-150 keV) in 27.9 sec: 0.254263 ( -0.026208 0.025608 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.66979e-07 ( -6.24569e-08 5.63301e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40193 ( 1.41499 1.41499 )
beta : -1.97897 ( 1.97156 0.312153 )
Epeak [keV] : 55.0762 ( -57.1918 -57.1918 )
Norm@50keV : 3.26598E-03 ( -0.00155626 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.92 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 55 degrees of freedom
# Null hypothesis probability = 1.132719e-01
Photon flux (15-150 keV) in 27.9 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) = 1.79e-07
S(50-100 keV) = 1.90e-07
T90 vs. Hardness ratio plot
T90 = 48 sec.
Hardness ratio (energy fluence ratio) = 1.06145
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.17968
Count Ratio (50-100 keV) / (15-25 keV) = 0.562636
Mask shadow pattern
IMX = 5.099258376762459E-01, IMY = -2.709861638310307E-02
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:
-101.867410 -11.368000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3745 35.3822 4.7 22.2 177.4 0.2167 2.4 4.7 Her X-1
268.1795 -1.5187 14.1 29.4 78.2 0.1279 0.8 12.0 SW J1753.5-0127
273.8709 -14.1304 36.7 40.7 64.0 -0.1089 -0.3 9.7 GX 17+2
288.6952 10.8412 3.4 18.4 22.9 0.3043 3.3 8.7 GRS 1915+105
299.5895 35.1941 0.4 20.4 -63.3 3.0103 30.7 0.5 Cyg X-1
308.0900 40.9411 2.1 28.7 -70.6 0.6806 5.6 1.1 Cyg X-3
326.2431 38.4584 5.6 41.9 -61.6 -0.5794 -2.1 8.9 Cyg X-2
298.0005 6.6955 1.8 27.3 10.2 0.6183 6.3 ------ UNKNOWN
232.5064 37.2358 2.1 39.9 175.1 0.6850 5.5 ------ UNKNOWN
335.9641 21.0621 2.3 52.8 -39.7 2.1708 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-11.368000 16.532600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2555 35.3275 9.1 22.3 177.2 -0.0638 -1.3 9.9 Her X-1
268.4070 -1.5447 6.5 29.4 77.7 -0.1573 -1.8 6.0 SW J1753.5-0127
274.0983 -13.9375 15.5 40.4 63.7 0.1548 0.7 8.0 GX 17+2
288.5981 10.9071 5.1 18.3 23.0 -0.1139 -2.2 12.0 GRS 1915+105
299.7356 35.1206 4.9 20.5 -63.0 0.1302 2.3 8.6 Cyg X-1
307.9088 40.9060 5.8 28.6 -70.6 -0.1465 -2.0 9.5 Cyg X-3
326.1398 38.1467 7.6 41.8 -61.1 0.2249 1.5 10.6 Cyg X-2
300.1802 9.1309 0.7 27.1 3.0 0.9000 16.8 ------ UNKNOWN
209.1542 40.1198 2.5 57.9 -179.8 1.4591 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
66.132590 302.714300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4103 35.2776 5.0 49.2 166.3 1.0990 2.3 4.5 Her X-1
268.3893 -1.6074 21.9 33.4 109.8 -0.1729 -0.5 9.4 SW J1753.5-0127
274.0025 -13.9993 3.5 34.8 85.6 1.2454 3.3 2.2 GX 17+2
285.0072 -24.8838 6.4 37.1 60.1 -0.7245 -1.8 2.7 HT1900.1-2455
288.8742 11.0267 3.9 11.3 137.7 0.4316 2.9 6.6 GRS 1915+105
299.5915 35.2045 0.2 26.1 -144.1 8.1105 49.1 0.2 Cyg X-1
308.1168 40.9738 1.4 32.6 -131.9 1.7669 8.5 1.3 Cyg X-3
326.1576 38.4492 15.6 37.5 -108.7 0.3040 0.7 7.7 Cyg X-2
Plot creation:
Sun May 31 16:41:44 EDT 2015