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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
154.8454 -20.6389 0.0075 26.0287 167.3440 2.2557843 25.783 TRIG_00508319
Foreground time interval of the image:
-8.704 41.397 (delta_t = 50.101 [sec])
Background time interval of the image:
-239.704 -8.704 (delta_t = 231.000 [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 4.096000
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 4.096000
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 4.096000
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 -8.704 sec. to 481.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65999 ( -0.0667031 0.0670717 )
Norm@50keV : 1.56024E-03 ( -5.35195e-05 5.33472e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.25 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.118115e-01
Photon flux (15-150 keV) in 490 sec: 0.204405 ( -0.00739329 0.00742915 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10333e-06 ( -2.5715e-07 2.58446e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.704 sec. to 481.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65831 ( -0.0671854 0.0674048 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.56339E-03 ( -5.3695e-05 5.20275e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.27 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 56 degrees of freedom
# Null hypothesis probability = 1.857066e-01
Photon flux (15-150 keV) in 490 sec: 0.204518 ( -0.007566 0.007206 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10157e-06 ( -2.43628e-07 2.53281e-07 ) ergs/cm2
Band function
Time interval is from -8.704 sec. to 481.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22008 ( 1.20934 1.20934 )
beta : -1.66454 ( -0.0820077 0.070293 )
Epeak [keV] : 42.0759 ( -42.8959 -42.8959 )
Norm@50keV : 3.37468E-03 ( -0.00191834 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.14 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.646143e-01
Photon flux (15-150 keV) in 490 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] : 14.7444 ( )
R^2/D10^2 : 2.21958E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 321.09 using 59 PHA bins.
# Reduced chi-squared = 5.6332 for 57 degrees of freedom
# Null hypothesis probability = 1.784662e-38
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.963e-07 3.619e-08
25- 50 1.941e-06 8.355e-08
50-150 2.849e-06 2.053e-07
15-150 5.287e-06 2.033e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 167.888 (-28.6167 -167.038)
Norm : 0.818669 (-0.0329854 0.0361313)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.07 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.457816e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.019e-06 5.880e-08
25- 50 1.919e-06 1.517e-07
50-150 3.961e-06 1.090e-06
15-150 6.900e-06 1.187e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.24162 (-0.583309 0.632388)
R1^2/D10^2 : 0.362783 (-0.112391 0.173757)
kT2 [keV] : 26.0031 (-2.44514 3.09726)
R2^2/D10^2 : 2.46889E-03 (-0.000798967 0.00104561)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.07 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.971955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.111e-06 1.200e-07
25- 50 1.860e-06 1.372e-07
50-150 4.122e-06 3.952e-07
15-150 7.092e-06 5.708e-07
Peak spectrum fit
Power-law model
Time interval is from 146.296 sec. to 147.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32759 ( -0.267504 0.265115 )
Norm@50keV : 7.46162E-03 ( -0.0011113 0.00110668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.76 using 59 PHA bins.
# Reduced chi-squared = 0.9256 for 57 degrees of freedom
# Null hypothesis probability = 6.348161e-01
Photon flux (15-150 keV) in 1 sec: 0.894874 ( -0.133944 0.134181 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32501e-08 ( -1.22876e-08 1.24351e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 146.296 sec. to 147.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32721 ( -0.608047 0.263534 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 7.48891E-03 ( -0.00111579 0.0068813 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.77 using 59 PHA bins.
# Reduced chi-squared = 0.9423 for 56 degrees of freedom
# Null hypothesis probability = 5.979235e-01
Photon flux (15-150 keV) in 1 sec: 0.896356 ( -0.1358 0.132614 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.33974e-08 ( -1.23967e-08 1.20447e-08 ) ergs/cm2
Band function
Time interval is from 146.296 sec. to 147.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88244 ( -4.88244 -4.88244 )
beta : -1.37172 ( -0.347888 0.287957 )
Epeak [keV] : 22.3333 ( -22.3333 9.29069 )
Norm@50keV : 1100.99 ( -161.654 3.2859e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.63 using 59 PHA bins.
# Reduced chi-squared = 0.9570 for 55 degrees of freedom
# Null hypothesis probability = 5.655797e-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] : 18.3623 (-4.47615 5.92036)
R^2/D10^2 : 5.06767E-02 (-0.0498945 0.078102)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.11 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 57 degrees of freedom
# Null hypothesis probability = 7.387410e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.399e-09 1.076e-09
25- 50 1.595e-08 4.404e-09
50-150 3.924e-08 1.429e-08
15-150 5.859e-08 1.511e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.67426 (-0.546399 0.546368)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.72 using 59 PHA bins.
# Reduced chi-squared = 0.9775 for 57 degrees of freedom
# Null hypothesis probability = 5.233410e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.150e-09 5.205e-09
25- 50 1.760e-08 9.900e-09
50-150 3.860e-08 2.192e-08
15-150 6.535e-08 3.669e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.59734 (-1.69141 2.21798)
R1^2/D10^2 : 1.25088 (-0.81382 2.57678)
kT2 [keV] : 36.8521 (-11.6632 36.4294)
R2^2/D10^2 : 4.80033E-03 (-0.00392069 0.0106149)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.9000 for 55 degrees of freedom
# Null hypothesis probability = 6.839152e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.081e-09 4.953e-09
25- 50 1.590e-08 8.151e-09
50-150 5.233e-08 2.928e-08
15-150 7.731e-08 3.807e-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: 1.44274 ( -0.106169 0.106292 )
Norm@50keV : 3.09251E-03 ( -0.000179424 0.000179084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.70 using 59 PHA bins.
# Reduced chi-squared = 0.8017 for 57 degrees of freedom
# Null hypothesis probability = 8.587006e-01
Photon flux (15-150 keV) in 50.1 sec: 0.380427 ( -0.0228995 0.0229725 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48462e-06 ( -9.43052e-08 9.47642e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34418 ( -0.414419 0.194917 )
Epeak [keV] : 326.748 ( -353.247 -353.247 )
Norm@50keV : 3.44531E-03 ( -0.000516148 0.00189008 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8140 for 56 degrees of freedom
# Null hypothesis probability = 8.386779e-01
Photon flux (15-150 keV) in 50.1 sec: 0.378255 ( -0.024295 0.024183 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47509e-06 ( -5.17182e-08 1.01142e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.69585 ( 7.69585 7.69585 )
beta : -1.44273 ( -0.106299 0.106162 )
Epeak [keV] : 77.8801 ( -77.8801 -77.8801 )
Norm@50keV : 0.420316 ( -0.0243864 0.0243398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.70 using 59 PHA bins.
# Reduced chi-squared = 0.8308 for 55 degrees of freedom
# Null hypothesis probability = 8.100652e-01
Photon flux (15-150 keV) in 50.1 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) = 1.89e-06
S(50-100 keV) = 2.39e-06
T90 vs. Hardness ratio plot
T90 = 290 sec.
Hardness ratio (energy fluence ratio) = 1.26455
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.16898
Count Ratio (50-100 keV) / (15-25 keV) = 0.829781
Mask shadow pattern
IMX = -4.764869517058909E-01, IMY = -1.069963987899719E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.704000 -8.704000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5147 -40.5461 1.2 15.2 94.0 1.8607 9.9 0.8 Vela X-1
170.3180 -60.6414 1.1 16.7 -40.2 1.8885 10.2 1.1 Cen X-3
186.7650 -62.8227 3.9 24.1 -49.2 0.6124 2.9 4.3 GX 301-2
120.8019 -51.2362 2.1 22.5 52.9 1.2469 5.6 ------ UNKNOWN
153.3618 -5.0805 3.0 41.6 165.1 1.3254 3.9 ------ UNKNOWN
183.7814 3.6375 2.4 56.4 -157.3 4.1875 4.9 ------ UNKNOWN
190.1830 -0.3011 2.9 55.7 -148.3 4.0746 4.0 ------ UNKNOWN
202.3893 -24.4301 3.5 43.8 -116.4 2.6116 3.3 ------ UNKNOWN
208.3293 -35.2779 2.7 41.2 -99.0 4.5522 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-8.704000 41.396600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5505 -40.6489 10.3 15.1 93.7 -0.1009 -1.1 5.7 Vela X-1
170.6206 -60.4727 0.0 16.6 -40.9 0.1268 1.5 12.7 Cen X-3
186.3478 -62.8017 7.1 23.9 -49.0 0.1457 1.6 8.7 GX 301-2
154.8454 -20.6389 0.5 26.0 167.3 2.2558 25.8 ------ UNKNOWN
194.4863 -31.3756 2.4 34.0 -115.3 0.6316 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
88.596590 934.496620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5337 -40.5293 0.7 25.8 18.1 8.0611 15.8 1.5 Vela X-1
170.3211 -60.6356 1.2 41.4 -28.6 7.6981 9.8 0.8 Cen X-3
186.7308 -62.7840 7.9 47.4 -36.3 1.6016 1.5 2.2 GX 301-2
119.4645 -29.4396 2.8 33.1 50.3 3.3883 4.2 ------ UNKNOWN
157.0137 22.1038 2.9 42.8 165.8 3.8400 4.0 ------ UNKNOWN
147.9150 -25.3622 3.1 7.9 35.1 1.5736 3.8 ------ UNKNOWN
154.8560 -20.6384 0.6 0.0 -179.5 8.8341 18.4 ------ UNKNOWN
159.7120 -7.2032 3.3 14.2 -177.2 1.5386 3.5 ------ UNKNOWN
156.2768 -54.5019 2.5 33.9 -18.7 2.5163 4.7 ------ UNKNOWN
185.7250 30.4501 3.0 59.1 -166.1 13.6245 3.8 ------ UNKNOWN
165.3534 -78.8079 3.9 58.4 -19.6 8.2805 3.0 ------ UNKNOWN
Plot creation:
Sat May 30 21:02:54 EDT 2015