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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
238.8948 40.9185 0.0025 18.4520 152.8293 6.4504576 77.728 TRIG_00456939
Foreground time interval of the image:
-4.296 14.813 (delta_t = 19.109 [sec])
Background time interval of the image:
-239.288 -4.296 (delta_t = 234.992 [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)
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 -4.296 sec. to 56.476 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23213 ( -0.0314518 0.0313679 )
Norm@50keV : 1.63131E-02 ( -0.000270926 0.000270348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.68 using 59 PHA bins.
# Reduced chi-squared = 0.7312 for 57 degrees of freedom
# Null hypothesis probability = 9.363271e-01
Photon flux (15-150 keV) in 60.77 sec: 1.92394 ( -0.0357226 0.0358861 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96877e-06 ( -1.62106e-07 1.62196e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.296 sec. to 56.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18133 ( -0.132718 0.0153292 )
Epeak [keV] : 992.247 ( -9767.33 -9767.33 )
Norm@50keV : 1.71118E-02 ( -0.000269329 0.00195464 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.08 using 59 PHA bins.
# Reduced chi-squared = 0.7514 for 56 degrees of freedom
# Null hypothesis probability = 9.160890e-01
Photon flux (15-150 keV) in 60.77 sec: 1.92289 ( -0.03541 0.03511 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.97132e-06 ( -1.60919e-07 1.61587e-07 ) ergs/cm2
Band function
Time interval is from -4.296 sec. to 56.476 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.200621 ( -2.35953 -2.35953 )
beta : -1.24289 ( -0.0324958 0.0324566 )
Epeak [keV] : 40.5747 ( -40.5374 148.451 )
Norm@50keV : 0.172417 ( -0.173784 400.894 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.63 using 59 PHA bins.
# Reduced chi-squared = 0.7205 for 55 degrees of freedom
# Null hypothesis probability = 9.412035e-01
Photon flux (15-150 keV) in 60.77 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] : 21.6745 ( )
R^2/D10^2 : 6.51236E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 778.26 using 59 PHA bins.
# Reduced chi-squared = 13.654 for 57 degrees of freedom
# Null hypothesis probability = 3.186670e-127
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.464e-07 1.243e-08
25- 50 1.816e-06 4.619e-08
50-150 6.369e-06 1.367e-07
15-150 8.531e-06 1.610e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 8.39442 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 433.75 using 59 PHA bins.
# Reduced chi-squared = 7.6096 for 57 degrees of freedom
# Null hypothesis probability = 2.285183e-59
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.270e-06 2.309e-08
25- 50 2.444e-06 4.588e-08
50-150 5.359e-06 1.009e-07
15-150 9.073e-06 1.671e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.56587 (-0.557406 0.587736)
R1^2/D10^2 : 0.858837 (-0.167894 0.219449)
kT2 [keV] : 35.8354 (-2.2521 2.7337)
R2^2/D10^2 : 1.08752E-02 (-0.0022691 0.00256228)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.20 using 59 PHA bins.
# Reduced chi-squared = 0.7490 for 55 degrees of freedom
# Null hypothesis probability = 9.163304e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.434e-07 5.165e-08
25- 50 2.204e-06 7.627e-08
50-150 6.924e-06 2.157e-07
15-150 9.971e-06 2.765e-07
Peak spectrum fit
Power-law model
Time interval is from 34.248 sec. to 35.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37432 ( -0.0686606 0.068865 )
Norm@50keV : 4.91931E-02 ( -0.00194014 0.00193873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.26 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.258511e-01
Photon flux (15-150 keV) in 1 sec: 5.95683 ( -0.239119 0.239315 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.77901e-07 ( -2.09711e-08 2.10428e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 34.248 sec. to 35.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.985492 ( -0.29085 0.272136 )
Epeak [keV] : 136.543 ( -37.5421 179.793 )
Norm@50keV : 7.60114E-02 ( -0.0195129 0.0284675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.14 using 59 PHA bins.
# Reduced chi-squared = 0.9846 for 56 degrees of freedom
# Null hypothesis probability = 5.074148e-01
Photon flux (15-150 keV) in 1 sec: 5.84812 ( -0.25012 0.25021 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65682e-07 ( -2.3076e-08 2.2944e-08 ) ergs/cm2
Band function
Time interval is from 34.248 sec. to 35.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.268607 ( -0.730602 3.19803 )
beta : -1.54954 ( -0.23077 0.131628 )
Epeak [keV] : 60.9212 ( -35.4836 67.0273 )
Norm@50keV : 0.214849 ( -0.225292 73.8955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.71 using 59 PHA bins.
# Reduced chi-squared = 0.9401 for 55 degrees of freedom
# Null hypothesis probability = 6.012627e-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] : 16.1593 ( )
R^2/D10^2 : 0.535606 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 171.49 using 59 PHA bins.
# Reduced chi-squared = 3.0086 for 57 degrees of freedom
# Null hypothesis probability = 2.139176e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.885e-08 2.335e-09
25- 50 1.224e-07 6.400e-09
50-150 2.243e-07 1.575e-08
15-150 3.756e-07 1.790e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 24.4693 (-0.976943 0.97701)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.98 using 59 PHA bins.
# Reduced chi-squared = 1.315 for 57 degrees of freedom
# Null hypothesis probability = 5.535913e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.130e-08 2.695e-09
25- 50 1.179e-07 4.900e-09
50-150 2.586e-07 1.060e-08
15-150 4.378e-07 2.025e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.77553 (-1.22373 1.29285)
R1^2/D10^2 : 2.75688 (-0.889751 1.54414)
kT2 [keV] : 32.3701 (-5.45172 9.41922)
R2^2/D10^2 : 3.81928E-02 (-0.0215205 0.0352741)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.05 using 59 PHA bins.
# Reduced chi-squared = 0.9645 for 55 degrees of freedom
# Null hypothesis probability = 5.495391e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.674e-08 6.285e-09
25- 50 1.212e-07 1.115e-08
50-150 3.009e-07 6.745e-08
15-150 4.688e-07 8.000e-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: 0.869887 ( -0.0379783 0.0377439 )
Norm@50keV : 2.18715E-02 ( -0.000461169 0.000459138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.8919 for 57 degrees of freedom
# Null hypothesis probability = 7.041705e-01
Photon flux (15-150 keV) in 19.11 sec: 2.51021 ( -0.0525616 0.0526357 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.74658e-06 ( -9.8401e-08 9.84578e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.793280 ( -0.138165 0.0880122 )
Epeak [keV] : 997.814 ( -999.605 -999.605 )
Norm@50keV : 2.34612E-02 ( -0.000867267 0.0030554 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.32 using 59 PHA bins.
# Reduced chi-squared = 0.8985 for 56 degrees of freedom
# Null hypothesis probability = 6.888794e-01
Photon flux (15-150 keV) in 19.11 sec: 2.50642 ( -0.05078 0.02613 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.73955e-06 ( -1.01398e-07 1.00232e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.789645 ( 0.789645 0.789645 )
beta : -0.869888 ( -0.0377283 0.0379985 )
Epeak [keV] : 15.2721 ( )
Norm@50keV : 3.24060E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.9243 for 55 degrees of freedom
# Null hypothesis probability = 6.343675e-01
Photon flux (15-150 keV) in 19.11 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) = 2.13e-06
S(50-100 keV) = 3.63e-06
T90 vs. Hardness ratio plot
T90 = 44.3279999494553 sec.
Hardness ratio (energy fluence ratio) = 1.70423
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.58078
Count Ratio (50-100 keV) / (15-25 keV) = 1.39768
Mask shadow pattern
IMX = -2.968442908855459E-01, IMY = -1.523657199714717E-01
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:
-239.288000 -4.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4008 35.1497 0.0 22.6 115.4 0.2410 0.9 11.9 Her X-1
299.5969 35.2031 0.8 39.0 46.0 6.6043 13.9 0.3 Cyg X-1
308.0989 40.9346 1.8 39.3 32.0 2.7656 6.4 1.2 Cyg X-3
326.2124 38.2033 7.4 50.9 20.4 -1.3216 -1.5 7.4 Cyg X-2
308.0802 37.6296 2.7 41.6 35.6 2.1345 4.3 ------ UNKNOWN
326.7368 38.5848 2.4 50.9 19.7 3.7634 4.9 ------ UNKNOWN
329.0776 47.4862 2.6 45.7 9.7 1.8390 4.4 ------ UNKNOWN
211.3116 18.5831 2.6 48.8 176.2 2.1538 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.296000 14.812600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4854 35.3837 5.5 22.3 115.2 -0.2211 -2.1 2.8 Her X-1
299.7436 35.1473 3.9 39.1 45.9 0.6445 3.0 8.2 Cyg X-1
307.9546 41.0458 5.7 39.1 32.0 0.3465 2.0 9.0 Cyg X-3
326.0400 38.4117 11.9 50.6 20.3 0.3444 1.0 8.2 Cyg X-2
238.8948 40.9185 0.1 18.5 152.8 6.4504 77.7 ------ UNKNOWN
206.2733 16.0201 2.4 53.3 -179.9 1.2543 4.8 ------ UNKNOWN
223.6866 77.2703 2.4 21.8 -73.6 0.4871 4.8 ------ UNKNOWN
183.9462 23.7524 2.3 58.0 -153.4 2.6099 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
54.812590 962.782600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3885 35.2787 9.1 13.4 66.1 -0.6119 -1.3 5.1 Her X-1
299.5975 35.1909 1.0 47.2 32.5 20.1313 11.3 0.7 Cyg X-1
308.1098 40.9141 3.7 50.8 21.9 6.9092 3.1 2.3 Cyg X-3
246.2499 3.6712 2.7 37.8 124.2 6.1216 4.5 ------ UNKNOWN
246.4043 4.0113 3.6 37.5 123.9 4.9918 3.8 ------ UNKNOWN
225.6690 12.2812 2.6 30.9 162.0 3.0940 4.5 ------ UNKNOWN
308.7316 54.6298 3.1 46.8 4.5 3.4591 3.7 ------ UNKNOWN
285.6322 60.6654 2.9 34.4 -4.7 2.5246 4.0 ------ UNKNOWN
196.5306 -1.5636 4.4 57.3 -170.6 6.3134 2.6 ------ UNKNOWN
339.0686 65.0186 2.5 57.5 -14.2 12.2795 4.6 ------ UNKNOWN
182.5968 14.4678 3.8 55.3 -145.2 12.6468 3.0 ------ UNKNOWN
Plot creation:
Sat May 30 22:09:07 EDT 2015