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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.4385 70.3799 0.0114 33.2487 113.5190 1.4167181 16.966 TRIG_00176918
Foreground time interval of the image:
-2.028 15.509 (delta_t = 17.537 [sec])
Background time interval of the image:
-299.192 -2.028 (delta_t = 297.164 [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)
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 -2.028 sec. to 61.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.992214 ( -0.164542 0.159213 )
Norm@50keV : 2.35260E-03 ( -0.000208598 0.000206442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.28 using 59 PHA bins.
# Reduced chi-squared = 0.9347 for 57 degrees of freedom
# Null hypothesis probability = 6.153932e-01
Photon flux (15-150 keV) in 63.72 sec: 0.270713 ( -0.0245227 0.0247407 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62582e-06 ( -1.4432e-07 1.44098e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.028 sec. to 61.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986067 ( -0.403424 0.227712 )
Epeak [keV] : 9999.33 ( )
Norm@50keV : 2.36654E-03 ( -0.000205909 0.00112797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.31 using 59 PHA bins.
# Reduced chi-squared = 0.9519 for 56 degrees of freedom
# Null hypothesis probability = 5.774262e-01
Photon flux (15-150 keV) in 63.72 sec: 0.270787 ( -0.024701 0.024527 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62255e-06 ( -1.4077e-07 1.46868e-07 ) ergs/cm2
Band function
Time interval is from -2.028 sec. to 61.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.865574 ( 0.865549 0.865549 )
beta : -0.992203 ( -0.159229 0.164521 )
Epeak [keV] : 27.8730 ( -27.9036 -27.9036 )
Norm@50keV : 3.79542E-03 ( -0.00164447 0.344014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.28 using 59 PHA bins.
# Reduced chi-squared = 0.9687 for 55 degrees of freedom
# Null hypothesis probability = 5.405820e-01
Photon flux (15-150 keV) in 63.72 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] : 24.2548 (-2.7915 3.43351)
R^2/D10^2 : 7.01929E-03 (-0.00235856 0.00331463)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.56 using 59 PHA bins.
# Reduced chi-squared = 1.396 for 57 degrees of freedom
# Null hypothesis probability = 2.586998e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.644e-08 8.663e-09
25- 50 2.593e-07 3.944e-08
50-150 1.136e-06 1.571e-07
15-150 1.441e-06 1.689e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.14719 (-0.101051 0.101027)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.11 using 59 PHA bins.
# Reduced chi-squared = 1.598 for 57 degrees of freedom
# Null hypothesis probability = 2.753344e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.821e-07 2.265e-08
25- 50 3.503e-07 8.379e-08
50-150 7.682e-07 3.061e-07
15-150 1.301e-06 4.430e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.78160 (-1.17841 1.99475)
R1^2/D10^2 : 2.64868 (-2.26576 18.8688)
kT2 [keV] : 28.6465 (-4.02293 5.84469)
R2^2/D10^2 : 4.02204E-03 (-0.0017277 0.0024263)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9663 for 55 degrees of freedom
# Null hypothesis probability = 5.457151e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.500e-07 6.673e-08
25- 50 2.403e-07 4.741e-08
50-150 1.207e-06 1.988e-07
15-150 1.597e-06 2.396e-07
Peak spectrum fit
Power-law model
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.822632 ( -0.347208 0.32192 )
Norm@50keV : 1.21987E-02 ( -0.00237469 0.00229355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.51 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.870833e-01
Photon flux (15-150 keV) in 1 sec: 1.40107 ( -0.261137 0.262988 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41214e-07 ( -2.5724e-08 2.57841e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.820010 ( -0.862675 0.320633 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.22968E-02 ( -0.00221471 0.0467775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.51 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 56 degrees of freedom
# Null hypothesis probability = 2.562231e-01
Photon flux (15-150 keV) in 1 sec: 1.40162 ( -0.27671 0.26214 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41223e-07 ( -2.5733e-08 2.5776e-08 ) ergs/cm2
Band function
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.99999 ( 9.99999 9.99999 )
beta : -0.822642 ( -0.321257 0.347212 )
Epeak [keV] : 15.6336 ( -15.6336 -15.6336 )
Norm@50keV : 1.65798 ( -0.322759 0.311724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.51 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.271174e-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] : 27.7974 (-5.64824 8.74681)
R^2/D10^2 : 2.60729E-02 (-0.014295 0.0260134)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.27 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.113086e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.299e-09 1.363e-09
25- 50 1.969e-08 7.219e-09
50-150 1.103e-07 3.498e-08
15-150 1.333e-07 4.485e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.73721 (-1.08812 1.088)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.20 using 59 PHA bins.
# Reduced chi-squared = 1.354 for 57 degrees of freedom
# Null hypothesis probability = 3.864972e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.429e-08 8.400e-09
25- 50 2.750e-08 1.580e-08
50-150 6.031e-08 3.408e-08
15-150 1.021e-07 5.910e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.17623 (-1.50519 2.33904)
R1^2/D10^2 : 33.6159 (-31.7386 2605.4)
kT2 [keV] : 31.3199 (-6.99921 12.3689)
R2^2/D10^2 : 1.76704E-02 (-0.0106588 0.020032)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.40 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Null hypothesis probability = 3.862337e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.152e-08 6.187e-09
25- 50 1.814e-08 8.049e-09
50-150 1.128e-07 6.022e-08
15-150 1.424e-07 5.400e-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: 0.822915 ( -0.172919 0.164424 )
Norm@50keV : 5.15484E-03 ( -0.00052087 0.00051232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.301797e-01
Photon flux (15-150 keV) in 17.54 sec: 0.592049 ( -0.058025 0.0583643 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04655e-06 ( -9.78418e-08 9.80375e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.389950 ( -0.864078 0.503173 )
Epeak [keV] : 230.719 ( -230.719 -230.719 )
Norm@50keV : 7.73737E-03 ( -0.00294211 0.0088859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.09 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 56 degrees of freedom
# Null hypothesis probability = 3.298318e-01
Photon flux (15-150 keV) in 17.54 sec: 0.581000 ( -0.060976 0.061141 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03193e-06 ( -1.04002e-07 1.02244e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.750470 ( 0.750391 0.750391 )
beta : -0.829079 ( -0.161158 0.176818 )
Epeak [keV] : 15.7911 ( )
Norm@50keV : 7.61320E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.13 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.653624e-01
Photon flux (15-150 keV) in 17.54 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) = 2.99e-07
S(50-100 keV) = 6.02e-07
T90 vs. Hardness ratio plot
T90 = 58.8320000171661 sec.
Hardness ratio (energy fluence ratio) = 2.01338
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.07748
Count Ratio (50-100 keV) / (15-25 keV) = 1.69324
Mask shadow pattern
IMX = -2.616173330901552E-01, IMY = -6.011339002880519E-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:
-299.192000 -2.028000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3859 35.1428 6.2 17.7 16.0 -0.3932 -1.8 12.5 Her X-1
268.1781 -1.3529 0.0 39.6 -60.1 1.0489 1.9 12.9 SW J1753.5-0127
288.7743 10.9503 1.0 28.9 -99.0 3.9498 11.7 1.4 GRS 1915+105
299.5846 35.1978 0.1 18.9 -162.6 16.8311 80.1 0.4 Cyg X-1
308.0994 40.9372 1.9 24.8 179.5 1.4651 5.9 1.0 Cyg X-3
326.1981 38.3173 87.8 38.9 -179.7 0.0430 0.1 1.3 Cyg X-2
328.6865 73.5763 2.9 43.8 126.2 3.5246 4.1 ------ UNKNOWN
245.6426 -3.2338 2.4 49.7 -31.0 2.8252 4.9 ------ UNKNOWN
289.5333 -1.3627 3.0 40.9 -93.4 4.0055 3.9 ------ UNKNOWN
307.4620 2.9580 4.3 44.9 -120.0 2.5342 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.028000 15.508590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4573 35.3421 282.7 17.6 16.6 0.0017 0.0 0.0 Her X-1
268.1781 -1.3529 0.0 39.6 -60.1 0.0289 0.3 12.9 SW J1753.5-0127
288.6823 10.8391 13.4 29.0 -98.7 -0.0528 -0.9 9.4 GRS 1915+105
299.7772 35.1186 3.9 19.1 -162.5 0.1239 3.0 10.4 Cyg X-1
307.9203 41.0788 90.0 24.7 179.1 0.0058 0.1 11.5 Cyg X-3
326.0378 38.4413 3.7 38.8 -179.9 -0.1832 -3.2 9.5 Cyg X-2
286.4385 70.3798 0.7 33.2 113.5 1.4168 17.0 ------ UNKNOWN
220.4739 15.4203 2.2 53.7 8.7 1.0369 5.2 ------ UNKNOWN
313.0368 35.8848 2.3 29.4 -170.8 0.2248 4.9 ------ UNKNOWN
328.0953 21.7378 2.7 47.2 -158.4 0.3281 4.2 ------ UNKNOWN
274.3820 10.9500 2.4 26.7 -68.8 0.2426 4.7 ------ UNKNOWN
239.8975 -4.0082 2.0 53.5 -25.5 0.7700 5.7 ------ UNKNOWN
295.8118 0.1902 2.6 41.5 -103.2 0.6821 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
68.508600 302.871400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3746 35.2104 12.9 39.1 -40.3 -0.2645 -0.9 8.9 Her X-1
299.5910 35.1915 0.4 35.9 -102.2 12.4409 30.4 0.6 Cyg X-1
308.1103 41.0048 1.7 31.4 -116.1 1.7400 6.6 3.1 Cyg X-3
326.2988 38.2564 3.8 38.2 -138.2 0.8019 3.0 7.2 Cyg X-2
286.2296 29.1858 3.3 41.2 -83.5 2.5840 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 14:37:21 EDT 2015