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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
197.0118 -52.7572 0.0117 29.9717 102.0933 2.4844132 16.436 TRIG_00522586
Foreground time interval of the image:
0.352 57.645 (delta_t = 57.293 [sec])
Background time interval of the image:
-239.056 -40.898 (delta_t = 198.158 [sec])
-40.056 0.352 (delta_t = 40.408 [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 12.160000
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 12.160000
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 12.160000
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 0.352 sec. to 170.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20984 ( -0.166819 0.164698 )
Norm@50keV : 1.20715E-03 ( -0.000116202 0.000116202 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.762008e-01
Photon flux (15-150 keV) in 169.7 sec: 0.141894 ( -0.0140707 0.0141044 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07258e-06 ( -2.19738e-07 2.21543e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.352 sec. to 170.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.228555 ( -0.892295 0.728011 )
Epeak [keV] : 99.0035 ( -23.5986 116.722 )
Norm@50keV : 3.40925E-03 ( -0.00179739 0.00487008 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.280169e-01
Photon flux (15-150 keV) in 169.7 sec: 0.135099 ( -0.015089 0.015007 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95406e-06 ( -2.37173e-07 2.39599e-07 ) ergs/cm2
Band function
Time interval is from 0.352 sec. to 170.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.228175 ( -0.664393 0.984815 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 98.9530 ( -23.5758 117.019 )
Norm@50keV : 3.41142E-03 ( -0.00179989 0.00488015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.911418e-01
Photon flux (15-150 keV) in 169.7 sec: 0.137225 ( ) 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] : 18.9918 (-2.06589 2.40672)
R^2/D10^2 : 7.85069E-03 (-0.00256685 0.0036782)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.63 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.275647e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.447e-08 1.894e-08
25- 50 4.542e-07 6.686e-08
50-150 1.204e-06 2.201e-07
15-150 1.753e-06 2.277e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.589697 (-0.0576941 0.0576892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.04 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.660467e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.493e-07 1.232e-07
25- 50 4.795e-07 1.790e-07
50-150 1.052e-06 5.707e-07
15-150 1.780e-06 9.011e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.66522 (-1.95024 3.83013)
R1^2/D10^2 : 0.359249 (-0.319955 4.57475)
kT2 [keV] : 21.7828 (-3.00585 4.86552)
R2^2/D10^2 : 4.67267E-03 (-0.00246647 0.0027655)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.84 using 59 PHA bins.
# Reduced chi-squared = 0.9972 for 55 degrees of freedom
# Null hypothesis probability = 4.805624e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.814e-07 8.084e-08
25- 50 4.288e-07 1.147e-07
50-150 1.305e-06 3.153e-07
15-150 1.915e-06 4.095e-07
Peak spectrum fit
Power-law model
Time interval is from 31.108 sec. to 32.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74996 ( -0.473194 0.528982 )
Norm@50keV : 6.41770E-03 ( -0.00207966 0.00196657 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.25 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.948783e-01
Photon flux (15-150 keV) in 1 sec: 0.867768 ( -0.233057 0.233121 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.92187e-08 ( -1.88961e-08 1.97602e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.108 sec. to 32.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37140 ( -2.21795 0.89918 )
Epeak [keV] : 76.1250 ( -76.1025 -76.1025 )
Norm@50keV : 1.03358E-02 ( -0.0103392 0.168526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.09 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 56 degrees of freedom
# Null hypothesis probability = 2.681121e-01
Photon flux (15-150 keV) in 1 sec: 0.857205 ( -0.237168 0.237015 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74494e-08 ( -1.97816e-08 2.09571e-08 ) ergs/cm2
Band function
Time interval is from 31.108 sec. to 32.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38251 ( -0.698202 1.3018 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 76.8868 ( -60.4615 -76.8868 )
Norm@50keV : 1.01987E-02 ( -0.00479861 0.168906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.09 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.381858e-01
Photon flux (15-150 keV) in 1 sec: 0.856186 ( 6.14381 -0.23367 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.71771e-08 ( -5.71701e-08 -1.95529e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9199 (-3.92354 6.23543)
R^2/D10^2 : 0.214233 (-0.212399 0.709733)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.10 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 57 degrees of freedom
# Null hypothesis probability = 1.913784e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.434e-09 3.701e-09
25- 50 2.009e-08 1.230e-08
50-150 1.709e-08 1.209e-08
15-150 4.361e-08 2.512e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 122.217 (-74.7764 -118.734)
Norm : 3.64309 (-1.0922 1.81793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.13 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.984987e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.482e-09 5.580e-09
25- 50 1.702e-08 1.004e-08
50-150 3.064e-08 2.166e-08
15-150 5.714e-08 3.602e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.53565 (-5.50192 5.2166)
R1^2/D10^2 : 2.35240 (-2.16081 -2.40575)
kT2 [keV] : 21.3083 (-18.3796 62.1287)
R2^2/D10^2 : 2.05835E-02 (-0.0208404 0.289034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.72 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 55 degrees of freedom
# Null hypothesis probability = 2.485066e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.021e-08 6.005e-09
25- 50 1.614e-08 8.655e-09
50-150 3.129e-08 2.122e-08
15-150 5.763e-08 2.969e-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: 1.07138 ( -0.164974 0.160932 )
Norm@50keV : 2.72060E-03 ( -0.000258545 0.000257972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.04 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 57 degrees of freedom
# Null hypothesis probability = 9.992526e-02
Photon flux (15-150 keV) in 57.29 sec: 0.314754 ( -0.030792 0.0309086 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64478e-06 ( -1.65906e-07 1.66881e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.57220E-03 ( -0.916514 0.749716 )
Epeak [keV] : 106.738 ( -24.9277 107.63 )
Norm@50keV : 8.05733E-03 ( -0.00420187 0.0111332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.64 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 56 degrees of freedom
# Null hypothesis probability = 2.005088e-01
Photon flux (15-150 keV) in 57.29 sec: 0.298302 ( -0.032936 0.032955 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5533e-06 ( -1.80865e-07 1.81094e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.48286E-03 ( -0.7334 0.858454 )
beta : -9.34803 ( 9.37167 19.3717 )
Epeak [keV] : 106.574 ( -22.1514 102.968 )
Norm@50keV : 8.09836E-03 ( -0.00413742 0.00406326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.64 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.754585e-01
Photon flux (15-150 keV) in 57.29 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) = 4.38e-07
S(50-100 keV) = 7.57e-07
T90 vs. Hardness ratio plot
T90 = 146.832000017166 sec.
Hardness ratio (energy fluence ratio) = 1.72831
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.65326
Count Ratio (50-100 keV) / (15-25 keV) = 1.85412
Mask shadow pattern
IMX = -1.208197273612199E-01, IMY = -5.638948055288383E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
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:
-239.056000 -40.898100
-40.056000 0.352000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4856 -40.5748 1.8 12.8 -64.6 1.1711 6.3 2.3 Vela X-1
170.1664 -60.7077 4.5 16.6 128.0 0.5115 2.5 6.7 Cen X-3
186.5835 -62.8612 2.5 24.5 124.4 1.1720 4.6 5.8 GX 301-2
203.4249 -57.4811 2.7 32.6 112.4 1.5174 4.3 ------ UNKNOWN
136.8135 -31.2425 2.7 20.2 -43.7 0.8320 4.2 ------ UNKNOWN
26.4435 -62.6748 3.8 59.0 -166.2 4.3395 3.1 ------ UNKNOWN
36.8511 -60.3491 3.7 57.3 -160.1 3.5990 3.2 ------ UNKNOWN
35.8622 -58.8589 3.7 58.7 -159.2 4.9201 3.1 ------ UNKNOWN
39.6625 -57.9229 3.5 58.0 -156.8 4.1682 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.352000 57.644600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6515 -40.7172 6.3 12.6 -64.7 0.1719 1.8 11.2 Vela X-1
170.1979 -60.4820 4.9 16.5 127.3 0.2397 2.3 9.1 Cen X-3
186.6052 -62.6282 9.2 24.5 123.9 0.1547 1.3 8.6 GX 301-2
197.0118 -52.7572 0.7 30.0 102.1 2.4849 16.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
108.244600 963.052500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6678 -40.4704 4.5 42.5 -69.3 7.2721 2.5 8.1 Vela X-1
170.4125 -60.6311 2.2 16.4 -99.7 2.9930 5.3 2.9 Cen X-3
186.6684 -62.7638 0.9 11.4 -126.1 5.9608 12.4 0.5 GX 301-2
255.8640 -37.9534 7.3 42.6 123.5 3.3544 1.6 8.8 4U 1700-377
264.7693 -44.4509 105.9 43.9 137.0 0.2079 0.1 1.1 4U 1735-44
248.5286 -47.4094 0.9 32.8 131.2 12.1080 13.3 ------ UNKNOWN
31.0873 -71.5808 9.0 55.3 -145.2 6.0200 1.3 ------ UNKNOWN
Plot creation:
Sat May 30 19:29:20 EDT 2015