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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
355.2693 9.9167 0.0224 23.2316 -133.1994 1.3227284 8.564 TRIG_00553918
Foreground time interval of the image:
30.088 169.508 (delta_t = 139.420 [sec])
Background time interval of the image:
-239.000 30.088 (delta_t = 269.088 [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 112.000000
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 112.000000
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 112.000000
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 30.088 sec. to 169.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40361 ( -0.272155 0.273367 )
Norm@50keV : 6.27000E-04 ( -9.89179e-05 9.82929e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9325 for 57 degrees of freedom
# Null hypothesis probability = 6.201383e-01
Photon flux (15-150 keV) in 139.4 sec: 7.64194E-02 ( -0.0119852 0.0120064 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.43936e-07 ( -1.47475e-07 1.49835e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.088 sec. to 169.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05050 ( -1.34622 0.608903 )
Epeak [keV] : 135.769 ( -135.769 -135.769 )
Norm@50keV : 9.43760E-04 ( -0.000408215 0.00334225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9438 for 56 degrees of freedom
# Null hypothesis probability = 5.948192e-01
Photon flux (15-150 keV) in 139.4 sec: 7.52513E-02 ( -0.0126155 0.0125037 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.21502e-07 ( -1.6463e-07 1.6376e-07 ) ergs/cm2
Band function
Time interval is from 30.088 sec. to 169.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.959928 ( 0.959897 5.94355 )
beta : -1.66519 ( 1.67778 0.528101 )
Epeak [keV] : 113.292 ( -114.254 -114.254 )
Norm@50keV : 1.06066E-03 ( -0.000416181 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.81 using 59 PHA bins.
# Reduced chi-squared = 0.9602 for 55 degrees of freedom
# Null hypothesis probability = 5.586617e-01
Photon flux (15-150 keV) in 139.4 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] : 15.8171 (-2.79672 3.60469)
R^2/D10^2 : 7.37395E-03 (-0.003748 0.00711781)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.01 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.673354e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.331e-08 1.791e-08
25- 50 2.221e-07 5.901e-08
50-150 3.867e-07 1.283e-07
15-150 6.621e-07 1.753e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.358 (-78.2434 -199.361)
Norm : 0.314731 (-0.0485445 0.0486576)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9422 for 57 degrees of freedom
# Null hypothesis probability = 5.993549e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.092e-07 6.275e-08
25- 50 2.102e-07 1.185e-07
50-150 4.609e-07 2.596e-07
15-150 7.803e-07 4.404e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.45315 (-3.48522 9.79113)
R1^2/D10^2 : 0.322375 (-0.307841 45.9759)
kT2 [keV] : 19.9989 (-5.0689 -20.0251)
R2^2/D10^2 : 2.97550E-03 (-0.00292364 0.00516912)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.62 using 59 PHA bins.
# Reduced chi-squared = 0.9749 for 55 degrees of freedom
# Null hypothesis probability = 5.275000e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.913e-08 5.317e-08
25- 50 1.919e-07 9.303e-08
50-150 4.731e-07 2.774e-07
15-150 7.641e-07 3.685e-07
Peak spectrum fit
Power-law model
Time interval is from 61.200 sec. to 62.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.901505 ( -0.642544 0.565347 )
Norm@50keV : 3.74406E-03 ( -0.00126444 0.00120499 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.38 using 59 PHA bins.
# Reduced chi-squared = 0.9539 for 57 degrees of freedom
# Null hypothesis probability = 5.741676e-01
Photon flux (15-150 keV) in 1 sec: 0.429748 ( -0.139326 0.141704 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19942e-08 ( -1.35591e-08 1.37197e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 61.200 sec. to 62.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.266067 ( -7.09796 -0.249036 )
Epeak [keV] : 171.446 ( -167.815 -167.815 )
Norm@50keV : 6.68657E-03 ( -0.00420821 1.87305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.23 using 59 PHA bins.
# Reduced chi-squared = 0.9685 for 56 degrees of freedom
# Null hypothesis probability = 5.419940e-01
Photon flux (15-150 keV) in 1 sec: 0.413982 ( -0.167664 0.153092 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1004e-08 ( -1.45522e-08 1.43509e-08 ) ergs/cm2
Band function
Time interval is from 61.200 sec. to 62.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.160546 ( 0.790059 0.790059 )
beta : -1.54426 ( 1.54337 1.54337 )
Epeak [keV] : 155.096 ( -155.093 -155.093 )
Norm@50keV : 7.36661E-03 ( -0.00736593 346636 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9858 for 55 degrees of freedom
# Null hypothesis probability = 5.045074e-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] : 24.6152 (-7.60698 15.9472)
R^2/D10^2 : 1.12141E-02 (-0.0112141 0.0247742)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9574 for 57 degrees of freedom
# Null hypothesis probability = 5.667346e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.190e-09 7.640e-10
25- 50 6.698e-09 4.162e-09
50-150 3.015e-08 1.909e-08
15-150 3.804e-08 2.416e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-94.0777 -199.363)
Norm : 1.78773 (-0.586003 0.586036)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 57 degrees of freedom
# Null hypothesis probability = 4.342648e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.452e-09 2.811e-09
25- 50 8.563e-09 5.155e-09
50-150 1.878e-08 1.170e-08
15-150 3.180e-08 2.049e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.93028 (-2.83765 40.1487)
R1^2/D10^2 : 14.2638 (-14.8015 442.672)
kT2 [keV] : 26.9229 (-8.70439 22.4271)
R2^2/D10^2 : 8.25246E-03 (-0.0082807 0.0200321)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.68 using 59 PHA bins.
# Reduced chi-squared = 0.9578 for 55 degrees of freedom
# Null hypothesis probability = 5.638755e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.299e-09 1.823e-09
25- 50 6.178e-09 3.681e-09
50-150 3.110e-08 1.919e-08
15-150 4.057e-08 2.374e-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: 1.40361 ( -0.272155 0.273367 )
Norm@50keV : 6.27000E-04 ( -9.89179e-05 9.82929e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9325 for 57 degrees of freedom
# Null hypothesis probability = 6.201383e-01
Photon flux (15-150 keV) in 139.4 sec: 7.64194E-02 ( -0.0119852 0.0120064 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.43936e-07 ( -1.47475e-07 1.49835e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05050 ( -1.34622 0.608903 )
Epeak [keV] : 135.769 ( -135.769 -135.769 )
Norm@50keV : 9.43760E-04 ( -0.000408215 0.00334225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9438 for 56 degrees of freedom
# Null hypothesis probability = 5.948192e-01
Photon flux (15-150 keV) in 139.4 sec: 7.52513E-02 ( -0.0126155 0.0125037 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.21502e-07 ( -1.6463e-07 1.6376e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.959928 ( 0.959897 5.94355 )
beta : -1.66519 ( 1.67778 0.528101 )
Epeak [keV] : 113.292 ( -114.254 -114.254 )
Norm@50keV : 1.06066E-03 ( -0.000416181 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.81 using 59 PHA bins.
# Reduced chi-squared = 0.9602 for 55 degrees of freedom
# Null hypothesis probability = 5.586617e-01
Photon flux (15-150 keV) in 139.4 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) = 1.99e-07
S(50-100 keV) = 3.00e-07
T90 vs. Hardness ratio plot
T90 = 85.5839999318123 sec.
Hardness ratio (energy fluence ratio) = 1.50754
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.45072
Count Ratio (50-100 keV) / (15-25 keV) = 1.02414
Mask shadow pattern
IMX = -2.938410813622833E-01, IMY = 3.129159711550278E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 112.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 112.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 112.000000
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:
-239.000000 30.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.2914 38.2185 7.3 49.1 174.3 -0.8172 -1.6 8.4 Cyg X-2
302.5113 14.4936 3.0 45.0 130.8 3.4091 3.9 ------ UNKNOWN
324.8757 38.7468 3.4 49.9 173.2 1.8019 3.4 ------ UNKNOWN
347.6212 -21.7052 2.0 14.2 -14.1 1.1126 5.8 ------ UNKNOWN
354.9746 23.0301 2.5 34.5 -147.5 1.2135 4.6 ------ UNKNOWN
24.3641 -51.8975 2.9 55.5 -20.6 2.7271 4.0 ------ UNKNOWN
355.3639 48.6739 5.8 58.7 -159.2 2.8779 2.0 ------ UNKNOWN
4.5723 36.9978 2.6 50.7 -146.0 2.6106 4.4 ------ UNKNOWN
25.5260 -17.3767 3.6 43.7 -63.9 3.3289 3.2 ------ UNKNOWN
23.5268 -8.8829 2.6 41.6 -76.4 3.7168 4.5 ------ UNKNOWN
12.9839 31.9586 2.0 50.7 -134.9 6.4047 5.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
30.088000 169.508000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.2729 38.2578 22.1 49.1 174.3 0.1894 0.5 6.1 Cyg X-2
355.2693 9.9166 1.3 23.2 -133.2 1.3228 8.6 ------ UNKNOWN
349.2826 41.0764 2.1 50.4 -162.2 1.8750 5.5 ------ UNKNOWN
18.2583 12.7482 2.2 42.5 -109.9 2.9209 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
365.300600 621.700600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6314 22.0152 0.3 27.7 -8.0 10.8989 46.1 0.1 Crab
122.3553 17.9037 3.0 44.6 50.0 3.3283 3.8 ------ UNKNOWN
103.9201 20.8337 2.3 32.9 28.6 1.4428 4.9 ------ UNKNOWN
76.9936 -59.4684 3.3 54.1 177.1 3.3443 3.5 ------ UNKNOWN
63.3572 -2.3180 2.1 20.8 -88.9 1.3521 5.4 ------ UNKNOWN
44.2583 -48.8717 2.7 54.7 -156.3 3.6959 4.2 ------ UNKNOWN
Plot creation:
Sat May 30 17:09:01 EDT 2015