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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
230.7848 25.6299 0.0148 40.9042 31.7463 3.2046489 12.968 TRIG_00423181
Foreground time interval of the image:
-33.480 72.101 (delta_t = 105.581 [sec])
Background time interval of the image:
-530.799 -508.939 (delta_t = 21.861 [sec])
-239.000 -33.480 (delta_t = 205.520 [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 64.000000
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 64.000000
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 64.000000
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)
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 -33.480 sec. to 80.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83693 ( -0.161889 0.167143 )
Norm@50keV : 2.35904E-03 ( -0.000229912 0.000225649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.99 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.511706e-01
Photon flux (15-150 keV) in 114 sec: 0.329842 ( -0.0288328 0.0289174 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4733e-06 ( -2.41072e-07 2.4339e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.480 sec. to 80.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01911 ( )
Epeak [keV] : 8.73626 ( )
Norm@50keV : 1.89073E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 56 degrees of freedom
# Null hypothesis probability = 1.356841e-01
Photon flux (15-150 keV) in 114 sec: 0.330203 ( -0.029392 0.028483 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4666e-06 ( -1.17682e-07 2.45613e-07 ) ergs/cm2
Band function
Time interval is from -33.480 sec. to 80.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50956 ( 1.51059 1.51059 )
beta : -1.83690 ( 1.8369 0.1618 )
Epeak [keV] : 20.1076 ( -19.6265 -19.6265 )
Norm@50keV : 5.03353E-03 ( -0.00255327 0.102529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.99 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 55 degrees of freedom
# Null hypothesis probability = 1.121423e-01
Photon flux (15-150 keV) in 114 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] : 12.4235 ( )
R^2/D10^2 : 6.59540E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 120.03 using 59 PHA bins.
# Reduced chi-squared = 2.1058 for 57 degrees of freedom
# Null hypothesis probability = 2.165554e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.460e-07 3.962e-08
25- 50 8.057e-07 9.308e-08
50-150 7.648e-07 1.466e-07
15-150 1.816e-06 2.018e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 103.789 (-28.8059 56.9477)
Norm : 1.42509 (-0.173449 0.196794)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.99 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 57 degrees of freedom
# Null hypothesis probability = 8.717517e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.246e-07 5.768e-08
25- 50 7.396e-07 7.632e-08
50-150 1.224e-06 4.168e-07
15-150 2.388e-06 4.497e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72900 (-0.977808 1.27536)
R1^2/D10^2 : 1.96523 (-1.23373 3.73468)
kT2 [keV] : 21.2650 (-3.79677 5.89293)
R2^2/D10^2 : 7.65839E-03 (-0.00451741 0.00833868)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.62 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.180611e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.078e-07 2.099e-07
25- 50 6.305e-07 1.870e-07
50-150 1.304e-06 4.372e-07
15-150 2.442e-06 6.595e-07
Peak spectrum fit
Power-law model
Time interval is from 69.904 sec. to 70.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70745 ( -0.615317 0.685827 )
Norm@50keV : 5.47449E-03 ( -0.00237915 0.00230706 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.719174e-01
Photon flux (15-150 keV) in 1 sec: 0.728925 ( -0.291002 0.292142 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0675e-08 ( -2.19113e-08 2.2839e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 69.904 sec. to 70.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.94291E-02 ( -5.81738 2.27395 )
Epeak [keV] : 52.8608 ( -52.7837 -52.7837 )
Norm@50keV : 4.80460E-02 ( -0.0488054 113.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.72 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 56 degrees of freedom
# Null hypothesis probability = 1.756466e-01
Photon flux (15-150 keV) in 1 sec: 0.700476 ( -0.289556 0.294543 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55955e-08 ( -2.10948e-08 2.43486e-08 ) ergs/cm2
Band function
Time interval is from 69.904 sec. to 70.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.97818 -5 )
beta : -2.06087 ( 2.06324 0.780027 )
Epeak [keV] : 27.7997 ( -27.8002 18.8213 )
Norm@50keV : 400.423 ( -151.858 6.19032e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.36 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 55 degrees of freedom
# Null hypothesis probability = 1.600418e-01
Photon flux (15-150 keV) in 1 sec: 0.699095 ( 6.30091 -0.288197 ) 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] : 12.3644 (-4.51158 7.07395)
R^2/D10^2 : 0.171401 (-0.171405 0.716865)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.15 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.902892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.553e-09 3.545e-09
25- 50 1.809e-08 1.137e-08
50-150 1.696e-08 1.229e-08
15-150 4.060e-08 2.667e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 116.322 (-77.9644 -113.262)
Norm : 3.15065 (-1.3543 2.30165)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.33 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.862404e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.216e-09 5.150e-09
25- 50 1.462e-08 8.960e-09
50-150 2.569e-08 1.953e-08
15-150 4.852e-08 3.322e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.31090 (-7.50768 -7.50768)
R1^2/D10^2 : 0.611725 (-0.591213 -0.591213)
kT2 [keV] : 18.3158 (-18.7502 -18.7502)
R2^2/D10^2 : 2.73623E-02 (-0.0246268 0.701549)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.57 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 55 degrees of freedom
# Null hypothesis probability = 1.557779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.310e-09 6.005e-09
25- 50 1.672e-08 1.375e-08
50-150 2.252e-08 1.606e-08
15-150 4.654e-08 3.187e-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: 1.83113 ( -0.173033 0.179093 )
Norm@50keV : 2.26815E-03 ( -0.000238312 0.000233496 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.98 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.030775e-01
Photon flux (15-150 keV) in 105.6 sec: 0.316399 ( -0.0296188 0.0296969 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20305e-06 ( -2.31656e-07 2.34065e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10712 ( -0.730971 0.0532213 )
Epeak [keV] : 45.4836 ( )
Norm@50keV : 1.63506E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.89 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 56 degrees of freedom
# Null hypothesis probability = 2.741537e-01
Photon flux (15-150 keV) in 105.6 sec: 0.316728 ( -0.03013 0.029298 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19774e-06 ( -2.27051e-07 2.36132e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.98684 ( 0.822499 1.98684 )
beta : -1.83108 ( 1.83112 0.173008 )
Epeak [keV] : 392.881 ( -715.336 -715.336 )
Norm@50keV : 2.26856E-03 ( 0.822496 -0.00226837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.98 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Null hypothesis probability = 2.412509e-01
Photon flux (15-150 keV) in 105.6 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) = 7.06e-07
S(50-100 keV) = 7.90e-07
T90 vs. Hardness ratio plot
T90 = 97.5999999642372 sec.
Hardness ratio (energy fluence ratio) = 1.11898
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.09392
Count Ratio (50-100 keV) / (15-25 keV) = 0.751364
Mask shadow pattern
IMX = 7.367381570224313E-01, IMY = -4.558411472072452E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-530.799400 -508.938600
-239.000000 -33.480000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
184.3823 -24.6203 3.3 46.0 139.0 2.2952 3.5 ------ UNKNOWN
243.9430 49.8100 2.3 53.2 -0.3 2.4977 5.0 ------ UNKNOWN
172.5949 62.0443 2.8 41.8 -52.8 1.9001 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-33.480000 72.100590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
210.2254 -1.5011 2.0 32.7 88.0 1.3936 5.8 ------ UNKNOWN
177.1322 -23.9154 2.5 46.1 148.3 1.6839 4.6 ------ UNKNOWN
222.4036 18.6487 2.2 34.0 44.7 1.0452 5.2 ------ UNKNOWN
230.7848 25.6299 0.9 40.9 31.7 3.2012 13.0 ------ UNKNOWN
165.6619 20.1341 2.3 19.3 -133.2 0.6254 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
132.500600 963.029400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4773 35.3190 8.9 22.5 -15.1 0.6221 1.3 1.7 Her X-1
268.3977 -1.3906 4.6 45.3 46.8 4.7472 2.5 4.1 SW J1753.5-0127
219.6611 11.6989 2.8 17.5 145.0 1.9385 4.2 ------ UNKNOWN
266.3162 42.3775 3.0 33.5 -23.0 2.1963 3.9 ------ UNKNOWN
219.5471 66.1336 2.3 41.1 -80.9 12.2637 5.1 ------ UNKNOWN
Plot creation:
Sun May 31 01:28:45 EDT 2015