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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
227.8538 -6.5434 0.0114 33.5472 65.0443 2.3983270 16.840 TRIG_00219101
Foreground time interval of the image:
-13.340 34.901 (delta_t = 48.241 [sec])
Background time interval of the image:
-239.600 -13.340 (delta_t = 226.260 [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)
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 -13.340 sec. to 120.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89466 ( -0.0972653 0.098943 )
Norm@50keV : 2.33505E-03 ( -0.000137942 0.000136656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.79 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 57 degrees of freedom
# Null hypothesis probability = 2.787747e-01
Photon flux (15-150 keV) in 134.2 sec: 0.334347 ( -0.0174974 0.0175201 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88084e-06 ( -1.67759e-07 1.69174e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.340 sec. to 120.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53832 ( -0.431419 0.384908 )
Epeak [keV] : 56.8534 ( -13.4931 -56.856 )
Norm@50keV : 3.67647E-03 ( -0.00138019 0.00265053 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.32 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 56 degrees of freedom
# Null hypothesis probability = 3.226030e-01
Photon flux (15-150 keV) in 134.2 sec: 0.327758 ( -0.018852 0.018837 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76961e-06 ( -2.05621e-07 2.06708e-07 ) ergs/cm2
Band function
Time interval is from -13.340 sec. to 120.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.415312 ( -2.49933 -1.07441 )
beta : -2.06487 ( -0.254034 0.155758 )
Epeak [keV] : 30.7580 ( -6.79305 19.8468 )
Norm@50keV : 8.83759E-02 ( -0.0885002 166.293 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.68 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.490422e-01
Photon flux (15-150 keV) in 134.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77649e-06 ( -2.77555e-06 -1.85706e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.6827 ( )
R^2/D10^2 : 0.117854 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 132.99 using 59 PHA bins.
# Reduced chi-squared = 2.3331 for 57 degrees of freedom
# Null hypothesis probability = 5.180279e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.747e-07 3.375e-08
25- 50 1.020e-06 6.401e-08
50-150 6.425e-07 8.065e-08
15-150 2.037e-06 1.188e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.3621 (-13.9422 18.9024)
Norm : 1.53853 (-0.125588 0.140997)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.97 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.353251e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.367e-07 4.187e-08
25- 50 8.896e-07 4.268e-08
50-150 1.280e-06 1.694e-07
15-150 2.707e-06 1.751e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.09083 (-0.945232 0.956475)
R1^2/D10^2 : 0.431153 (-0.149254 0.269989)
kT2 [keV] : 26.5684 (-5.99859 11.1879)
R2^2/D10^2 : 2.62483E-03 (-0.00180068 0.00427406)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.33 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.248796e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.154e-07 7.173e-08
25- 50 9.091e-07 1.178e-07
50-150 1.380e-06 5.761e-07
15-150 2.804e-06 7.341e-07
Peak spectrum fit
Power-law model
Time interval is from 75.440 sec. to 76.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48231 ( -0.16454 0.166806 )
Norm@50keV : 1.01829E-02 ( -0.00102455 0.00101937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.779305e-01
Photon flux (15-150 keV) in 1 sec: 1.26528 ( -0.125319 0.125474 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.6878e-08 ( -1.06497e-08 1.07704e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 75.440 sec. to 76.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.651006 ( -0.836626 0.704842 )
Epeak [keV] : 80.8230 ( -19.8093 150.858 )
Norm@50keV : 2.68040E-02 ( -0.0147666 0.0426238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.67 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.777509e-01
Photon flux (15-150 keV) in 1 sec: 1.22164 ( -0.13101 0.13076 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.13167e-08 ( -1.16877e-08 1.18123e-08 ) ergs/cm2
Band function
Time interval is from 75.440 sec. to 76.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.632707 ( -0.55398 4.11403 )
beta : -2.63105 ( 2.5814 7.82721 )
Epeak [keV] : 79.8609 ( -47.1695 136.964 )
Norm@50keV : 2.74293E-02 ( -0.0153326 0.237278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.437180e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.12184e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.0285 (-1.70431 1.94501)
R^2/D10^2 : 0.146024 (-0.0506877 0.0765013)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.07 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.624894e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.903e-09 1.274e-09
25- 50 2.747e-08 3.855e-09
50-150 4.227e-08 7.990e-09
15-150 7.665e-08 1.053e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-63.2269 -199.363)
Norm : 5.20623 (-0.504986 0.504977)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.84 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 57 degrees of freedom
# Null hypothesis probability = 3.393970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.296e-08 7.170e-09
25- 50 2.494e-08 1.065e-08
50-150 5.469e-08 2.916e-08
15-150 9.260e-08 2.941e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.95835 (-2.95258 3.89969)
R1^2/D10^2 : 1.05499 (-0.738305 6.50804)
kT2 [keV] : 21.7030 (-4.85808 16.9071)
R2^2/D10^2 : 3.19931E-02 (-0.0285689 0.0567396)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.87 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.356550e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.096e-08 5.833e-09
25- 50 2.576e-08 1.336e-08
50-150 5.356e-08 2.933e-08
15-150 9.028e-08 4.664e-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: 1.53939 ( -0.15959 0.160386 )
Norm@50keV : 2.98754E-03 ( -0.000278002 0.000276056 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.494980e-01
Photon flux (15-150 keV) in 48.24 sec: 0.377054 ( -0.0343448 0.0343982 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35884e-06 ( -1.37554e-07 1.3884e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54131 ( -0.16311 0.158315 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.99019E-03 ( -0.000646398 0.00236356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.153595e-01
Photon flux (15-150 keV) in 48.24 sec: 0.377189 ( -0.034493 0.03413 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35811e-06 ( -1.42626e-07 1.38121e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94389 ( -14.5005 -4.94389 )
beta : -1.63173 ( -0.218552 0.181148 )
Epeak [keV] : 23.7731 ( -6.82609 4.7063 )
Norm@50keV : 413.253 ( -36.6198 3449.12 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.49 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Null hypothesis probability = 3.832380e-01
Photon flux (15-150 keV) in 48.24 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) = 8.39e-07
S(50-100 keV) = 9.02e-07
T90 vs. Hardness ratio plot
T90 = 116.06400001049 sec.
Hardness ratio (energy fluence ratio) = 1.07509
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.18258
Count Ratio (50-100 keV) / (15-25 keV) = 0.614804
Mask shadow pattern
IMX = 2.797615563035780E-01, IMY = -6.011639666073223E-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:
-239.600000 -13.340000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
225.3619 17.2483 2.2 38.5 24.6 1.2972 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-13.340000 34.900590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
227.8538 -6.5434 0.7 33.5 65.0 2.3984 16.8 ------ UNKNOWN
176.4432 -55.4500 2.3 51.6 164.7 1.2395 5.0 ------ UNKNOWN
178.2693 -52.6057 2.6 48.6 164.7 0.8465 4.5 ------ UNKNOWN
204.1151 49.9200 2.6 56.4 -20.3 1.2440 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
88.100620 962.440000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9819 -15.6379 0.1 19.1 99.1 62.5354 82.2 0.2 Sco X-1
254.3242 35.3441 12.3 48.7 8.1 1.6030 0.9 6.5 Her X-1
255.9935 -37.8412 0.7 40.4 124.1 45.6698 16.8 0.4 4U 1700-377
256.4384 -36.4171 71.1 39.7 122.1 0.3971 0.2 0.4 GX 349+2
263.1575 -24.8220 10.8 38.4 101.6 -2.7630 -1.1 9.3 GX 1+4
268.3650 -1.3173 6.7 40.7 63.6 5.5672 1.7 8.1 SW J1753.5-0127
220.5041 -38.2514 2.8 32.4 170.0 3.4903 4.1 ------ UNKNOWN
228.5531 -21.7016 3.6 15.2 156.7 2.1629 3.2 ------ UNKNOWN
181.5428 -13.8175 3.1 46.1 -123.7 13.6490 3.7 ------ UNKNOWN
Plot creation:
Sun May 31 12:38:11 EDT 2015