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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
331.1803 52.9923 0.0077 32.7270 50.5117 3.7362482 25.115 TRIG_00333427
Foreground time interval of the image:
-20.076 28.349 (delta_t = 48.425 [sec])
Background time interval of the image:
-239.752 -20.076 (delta_t = 219.676 [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 2.048000
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 2.048000
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 2.048000
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 -20.076 sec. to 45.812 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66195 ( -0.122695 0.124629 )
Norm@50keV : 3.70910E-03 ( -0.000266941 0.000264311 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.69 using 59 PHA bins.
# Reduced chi-squared = 0.5736 for 57 degrees of freedom
# Null hypothesis probability = 9.959904e-01
Photon flux (15-150 keV) in 65.89 sec: 0.486242 ( -0.0320788 0.0321048 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27029e-06 ( -1.74264e-07 1.76349e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.076 sec. to 45.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47482 ( -0.5237 0.294954 )
Epeak [keV] : 129.719 ( -65.4963 -129.784 )
Norm@50keV : 4.67097E-03 ( -0.00131492 0.00413714 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.25 using 59 PHA bins.
# Reduced chi-squared = 0.5758 for 56 degrees of freedom
# Null hypothesis probability = 9.954661e-01
Photon flux (15-150 keV) in 65.89 sec: 0.481129 ( -0.034594 0.051275 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22423e-06 ( -2.11118e-07 2.07481e-07 ) ergs/cm2
Band function
Time interval is from -20.076 sec. to 45.812 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13627 ( 1.12406 1.12406 )
beta : -1.78244 ( 1.78666 0.220651 )
Epeak [keV] : 61.4487 ( -60.6383 -60.6383 )
Norm@50keV : 7.67166E-03 ( -0.00451283 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.64 using 59 PHA bins.
# Reduced chi-squared = 0.5753 for 55 degrees of freedom
# Null hypothesis probability = 9.951801e-01
Photon flux (15-150 keV) in 65.89 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21881e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4841 (-1.02664 1.14226)
R^2/D10^2 : 9.99149E-02 (-0.0271956 0.0367651)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.91 using 59 PHA bins.
# Reduced chi-squared = 1.420 for 57 degrees of freedom
# Null hypothesis probability = 2.034987e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.175e-07 2.685e-08
25- 50 7.164e-07 5.581e-08
50-150 6.888e-07 1.101e-07
15-150 1.623e-06 1.308e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 146.742 (-42.9523 -145.59)
Norm : 1.99511 (-0.14812 0.18774)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.66 using 59 PHA bins.
# Reduced chi-squared = 0.5729 for 57 degrees of freedom
# Null hypothesis probability = 9.960495e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.382e-07 3.304e-08
25- 50 6.249e-07 8.773e-08
50-150 1.222e-06 4.704e-07
15-150 2.186e-06 5.528e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.27000 (-1.79237 1.79284)
R1^2/D10^2 : 0.498270 (-0.241885 0.584874)
kT2 [keV] : 27.1537 (-7.88775 21.0281)
R2^2/D10^2 : 4.55023E-03 (-0.00364416 0.00935501)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.46 using 59 PHA bins.
# Reduced chi-squared = 0.6447 for 55 degrees of freedom
# Null hypothesis probability = 9.812097e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.261e-07 6.790e-08
25- 50 6.428e-07 1.465e-07
50-150 1.246e-06 6.024e-07
15-150 2.215e-06 6.945e-07
Peak spectrum fit
Power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03757 ( -0.307038 0.294545 )
Norm@50keV : 1.29281E-02 ( -0.00221503 0.00220512 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.03 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.011369e-01
Photon flux (15-150 keV) in 1 sec: 1.49182 ( -0.260689 0.261879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37986e-07 ( -2.54086e-08 2.56157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.656391 ( -1.661 0.643338 )
Epeak [keV] : 205.138 ( -205.094 -205.094 )
Norm@50keV : 1.90280E-02 ( -0.00806412 0.071285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.77 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 56 degrees of freedom
# Null hypothesis probability = 3.744519e-01
Photon flux (15-150 keV) in 1 sec: 1.46864 ( -0.27604 0.27041 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35901e-07 ( -2.7072e-08 2.6631e-08 ) ergs/cm2
Band function
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.656954 ( 0.853409 0.853409 )
beta : -1.38515 ( 1.39999 2.02019 )
Epeak [keV] : 200.501 ( -191.619 808.314 )
Norm@50keV : 1.91478E-02 ( -0.00726267 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.73 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 3.403065e-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] : 21.8805 (-4.17852 5.85434)
R^2/D10^2 : 5.43815E-02 (-0.0285982 0.053121)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.33 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.924225e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.830e-09 1.843e-09
25- 50 2.546e-08 8.305e-09
50-150 9.105e-08 3.234e-08
15-150 1.213e-07 3.484e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.09472 (-1.07729 1.07721)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.18 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.677080e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.518e-08 8.850e-09
25- 50 2.921e-08 1.686e-08
50-150 6.406e-08 3.715e-08
15-150 1.084e-07 6.145e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.59811 (-1.96691 5.48385)
R1^2/D10^2 : 14.3169 (-13.9787 2294.04)
kT2 [keV] : 24.9277 (-5.38341 9.91335)
R2^2/D10^2 : 3.43289E-02 (-0.0216586 0.027498)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.11 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.964800e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.132e-08 6.147e-09
25- 50 2.303e-08 9.814e-09
50-150 9.693e-08 4.630e-08
15-150 1.313e-07 5.378e-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: 1.61668 ( -0.111194 0.112613 )
Norm@50keV : 4.82353E-03 ( -0.000317153 0.000314873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.12 using 59 PHA bins.
# Reduced chi-squared = 0.5986 for 57 degrees of freedom
# Null hypothesis probability = 9.930329e-01
Photon flux (15-150 keV) in 48.42 sec: 0.623090 ( -0.0383964 0.038428 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17994e-06 ( -1.5458e-07 1.56173e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14143 ( -0.510187 0.451513 )
Epeak [keV] : 84.2877 ( -22.7882 433.374 )
Norm@50keV : 8.61342E-03 ( -0.00357555 0.00729549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.88 using 59 PHA bins.
# Reduced chi-squared = 0.5514 for 56 degrees of freedom
# Null hypothesis probability = 9.974465e-01
Photon flux (15-150 keV) in 48.42 sec: 0.607263 ( -0.041246 0.041103 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07493e-06 ( -1.83275e-07 1.84737e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.783766 ( -0.683292 5.04049 )
beta : -1.86855 ( 1.86911 0.25307 )
Epeak [keV] : 58.2432 ( -33.4261 147.789 )
Norm@50keV : 1.46131E-02 ( -0.00506384 296.769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.03 using 59 PHA bins.
# Reduced chi-squared = 0.5460 for 55 degrees of freedom
# Null hypothesis probability = 9.975718e-01
Photon flux (15-150 keV) in 48.42 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) = 6.05e-07
S(50-100 keV) = 7.65e-07
T90 vs. Hardness ratio plot
T90 = 50.3199999928474 sec.
Hardness ratio (energy fluence ratio) = 1.26446
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.266
Count Ratio (50-100 keV) / (15-25 keV) = 0.817161
Mask shadow pattern
IMX = 4.086775134310253E-01, IMY = -4.959717974243960E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.752000 -20.076000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4721 35.3754 10.9 34.1 -63.0 -0.3742 -1.1 2.1 Her X-1
268.4074 -1.4246 5.0 42.5 -127.0 1.2166 2.3 2.9 SW J1753.5-0127
274.0723 -13.9016 0.0 50.7 -142.1 -0.4308 -0.6 9.0 GX 17+2
284.9091 -24.8958 7.4 58.1 -158.2 -2.2656 -1.5 7.1 HT1900.1-2455
288.7859 10.9392 1.7 22.3 -151.5 1.4697 6.9 0.8 GRS 1915+105
299.6030 35.2047 0.2 4.3 57.5 9.0588 46.6 0.7 Cyg X-1
308.2754 40.9933 7.1 13.3 55.9 0.3306 1.6 7.9 Cyg X-3
326.0027 38.4801 0.0 25.3 77.7 0.6626 2.2 12.4 Cyg X-2
255.8983 13.2789 3.3 41.0 -98.0 3.6408 3.5 ------ UNKNOWN
234.8677 41.9535 2.7 48.4 -50.0 4.8837 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-20.076000 28.348600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2703 35.3172 28.6 34.3 -63.1 0.0551 0.4 9.3 Her X-1
268.4375 -1.5692 17.5 42.6 -127.1 0.1338 0.7 8.1 SW J1753.5-0127
274.0654 -14.0506 3.7 50.8 -142.2 1.0071 3.2 3.6 GX 17+2
285.0897 -24.9971 5.7 58.2 -158.4 0.9375 2.0 5.4 HT1900.1-2455
288.6181 11.0612 0.0 22.2 -151.0 0.1572 1.8 12.7 GRS 1915+105
299.4648 35.3382 6.5 4.3 55.1 0.1518 1.8 10.2 Cyg X-1
307.9142 40.9376 13.9 13.0 55.4 0.0755 0.8 8.9 Cyg X-3
326.0655 38.2895 6.2 25.4 78.1 -0.2399 -1.9 5.4 Cyg X-2
331.1803 52.9922 0.5 32.7 50.5 3.7368 25.1 ------ UNKNOWN
320.9842 -11.3914 2.2 49.9 157.1 1.6258 5.2 ------ UNKNOWN
215.8207 62.7601 2.4 57.1 -22.2 1.9614 4.8 ------ UNKNOWN
265.5354 -4.5811 2.3 46.7 -126.2 1.8695 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
81.148590 962.348700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5903 35.1972 0.2 28.4 -125.1 34.7769 51.8 0.3 Cyg X-1
307.8912 41.0473 11.4 19.7 -127.0 0.5471 1.0 11.4 Cyg X-3
326.0859 38.2183 3.4 15.2 -173.7 1.7947 3.4 7.4 Cyg X-2
324.3203 18.9708 2.9 34.4 -177.6 2.6657 4.0 ------ UNKNOWN
354.9229 84.6028 3.8 32.1 -4.9 1.9162 3.1 ------ UNKNOWN
238.3213 72.5381 3.0 41.1 -36.1 3.3823 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 05:37:30 EDT 2015