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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.5290 55.3184 0.0077 22.9670 -50.0531 1.6264078 24.903 TRIG_00539563
Foreground time interval of the image:
-6.852 10.717 (delta_t = 17.569 [sec])
Background time interval of the image:
-265.283 -250.525 (delta_t = 14.759 [sec])
-239.184 -6.852 (delta_t = 232.332 [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 0.512000
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 0.512000
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 0.512000
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 -6.852 sec. to 79.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50395 ( -0.0571706 0.0572506 )
Norm@50keV : 5.59270E-03 ( -0.000159328 0.000159227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8480 for 57 degrees of freedom
# Null hypothesis probability = 7.862816e-01
Photon flux (15-150 keV) in 86.82 sec: 0.698933 ( -0.0215333 0.0216329 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60327e-06 ( -1.42044e-07 1.4268e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.852 sec. to 79.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50128 ( -0.216419 0.0590087 )
Epeak [keV] : 9998.60 ( )
Norm@50keV : 5.60909E-03 ( -0.000159974 0.00142347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8631 for 56 degrees of freedom
# Null hypothesis probability = 7.569991e-01
Photon flux (15-150 keV) in 86.82 sec: 0.698538 ( -0.02146 0.021341 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60362e-06 ( -1.3273e-07 1.40579e-07 ) ergs/cm2
Band function
Time interval is from -6.852 sec. to 79.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.555699 ( 1.03932 1.03932 )
beta : -1.51386 ( 1.51043 0.0602351 )
Epeak [keV] : 37.2211 ( -36.5438 487.757 )
Norm@50keV : 2.87257E-02 ( -0.0292082 550808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.90 using 59 PHA bins.
# Reduced chi-squared = 0.8709 for 55 degrees of freedom
# Null hypothesis probability = 7.403183e-01
Photon flux (15-150 keV) in 86.82 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] : 16.4322 ( )
R^2/D10^2 : 5.44503E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 327.15 using 59 PHA bins.
# Reduced chi-squared = 5.7395 for 57 degrees of freedom
# Null hypothesis probability = 1.436934e-39
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.623e-07 1.558e-08
25- 50 1.129e-06 4.081e-08
50-150 2.151e-06 1.237e-07
15-150 3.542e-06 1.220e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.84514 (-0.0806398 0.0806387)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.65 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.147995e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.151e-07 1.901e-08
25- 50 1.183e-06 3.690e-08
50-150 2.595e-06 7.857e-08
15-150 4.394e-06 1.402e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.58598 (-0.658512 0.725861)
R1^2/D10^2 : 0.897015 (-0.284412 0.447911)
kT2 [keV] : 27.0120 (-2.36063 3.01082)
R2^2/D10^2 : 8.30751E-03 (-0.00253932 0.00316951)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.91 using 59 PHA bins.
# Reduced chi-squared = 0.8892 for 55 degrees of freedom
# Null hypothesis probability = 7.053387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.947e-07 5.787e-08
25- 50 1.131e-06 7.249e-08
50-150 2.832e-06 2.309e-07
15-150 4.558e-06 3.091e-07
Peak spectrum fit
Power-law model
Time interval is from 36.556 sec. to 37.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31356 ( -0.128593 0.129308 )
Norm@50keV : 2.24175E-02 ( -0.0015482 0.00154279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.52 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.499467e-01
Photon flux (15-150 keV) in 1 sec: 2.68126 ( -0.182829 0.183015 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20801e-07 ( -1.77985e-08 1.797e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.556 sec. to 37.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30911 ( -0.225458 0.130845 )
Epeak [keV] : 9999.28 ( -9999.36 -9999.36 )
Norm@50keV : 2.25104E-02 ( -0.00557925 0.00699469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.150466e-01
Photon flux (15-150 keV) in 1 sec: 2.68250 ( -0.18444 0.18128 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20425e-07 ( -1.7369e-08 1.8038e-08 ) ergs/cm2
Band function
Time interval is from 36.556 sec. to 37.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06766 ( 1.06767 1.06767 )
beta : -1.31354 ( -0.129461 0.128594 )
Epeak [keV] : 38.4848 ( -38.4829 -38.4829 )
Norm@50keV : 4.24277E-02 ( -0.0164765 3.21411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.52 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.833449e-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] : 17.4518 ( )
R^2/D10^2 : 0.182227 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 129.82 using 59 PHA bins.
# Reduced chi-squared = 2.2776 for 57 degrees of freedom
# Null hypothesis probability = 1.322427e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.122e-08 1.438e-09
25- 50 5.068e-08 4.985e-09
50-150 1.111e-07 1.490e-08
15-150 1.730e-07 1.650e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 10.8470 (-0.747914 0.74792)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.90 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.626689e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.719e-08 2.300e-09
25- 50 5.230e-08 8.545e-09
50-150 1.147e-07 3.796e-08
15-150 1.942e-07 5.583e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.32609 (-1.21611 1.43359)
R1^2/D10^2 : 3.83978 (-1.97337 4.8251)
kT2 [keV] : 31.3742 (-5.6782 9.50771)
R2^2/D10^2 : 2.37018E-02 (-0.0129537 0.0212247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.438516e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.550e-08 8.125e-09
25- 50 4.680e-08 9.425e-09
50-150 1.549e-07 4.028e-08
15-150 2.272e-07 5.810e-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: 1.49082 ( -0.105779 0.106326 )
Norm@50keV : 6.06570E-03 ( -0.000357756 0.000356444 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.60 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.530136e-01
Photon flux (15-150 keV) in 17.57 sec: 0.755363 ( -0.0440985 0.0442101 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01255e-06 ( -6.61795e-08 6.66904e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34539 ( -0.412242 0.200101 )
Epeak [keV] : 224.048 ( -224.048 -224.048 )
Norm@50keV : 7.18381E-03 ( -0.00143024 0.00426892 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.18 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.311141e-01
Photon flux (15-150 keV) in 17.57 sec: 0.749153 ( -0.046901 0.046624 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.99506e-07 ( -7.53876e-08 7.47182e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.202915 ( 0.886403 0.886403 )
beta : -1.55075 ( 1.55523 0.14867 )
Epeak [keV] : 40.1251 ( -40.0644 210.524 )
Norm@50keV : 4.68693E-02 ( -0.0484061 275.355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.47 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 55 degrees of freedom
# Null hypothesis probability = 4.199192e-01
Photon flux (15-150 keV) in 17.57 sec: 0.747014 ( ) 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) = 1.14e-06
S(50-100 keV) = 1.61e-06
T90 vs. Hardness ratio plot
T90 = 52.2519999742508 sec.
Hardness ratio (energy fluence ratio) = 1.41228
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.24381
Count Ratio (50-100 keV) / (15-25 keV) = 0.971596
Mask shadow pattern
IMX = 2.721098443244023E-01, IMY = 3.248983524118090E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-265.283400 -250.524600
-239.184000 -6.852000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3577 35.4718 6.1 35.4 -100.5 0.9621 1.9 9.2 Her X-1
299.6630 35.2264 5.0 38.5 -163.4 0.7384 2.3 3.9 Cyg X-1
308.1664 40.9669 2.0 35.2 -177.1 1.7043 5.8 2.7 Cyg X-3
326.1504 38.2272 6.0 43.3 164.6 0.9178 1.9 5.8 Cyg X-2
301.7294 14.7887 3.6 58.8 -159.1 4.8897 3.3 ------ UNKNOWN
289.2860 16.1550 4.4 55.2 -145.3 3.7771 2.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.852000 10.716620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3243 35.3422 4.1 35.5 -100.5 0.3060 2.8 6.5 Her X-1
299.3521 35.2577 22.8 38.4 -163.0 0.0400 0.5 12.1 Cyg X-1
307.9435 40.9315 6.0 35.2 -176.8 -0.1357 -1.9 7.7 Cyg X-3
326.1039 38.2229 20.6 43.3 164.6 0.0624 0.6 6.7 Cyg X-2
335.2550 42.1814 2.3 42.8 152.9 0.6186 5.1 ------ UNKNOWN
228.5290 55.3184 0.5 23.0 -50.1 1.6262 24.9 ------ UNKNOWN
184.2642 39.0602 2.0 52.0 -20.5 0.7921 5.7 ------ UNKNOWN
293.9580 17.4747 2.5 54.7 -150.9 0.9980 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
55.516600 422.916630
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5355 35.2875 61.2 26.8 -130.0 -0.0656 -0.2 5.0 Her X-1
299.6225 35.1479 24.6 51.4 -175.5 0.3325 0.5 3.6 Cyg X-1
307.9888 41.0136 4.5 51.8 173.3 2.2782 2.5 6.6 Cyg X-3
320.1975 72.0841 3.0 39.0 131.8 2.5220 3.8 ------ UNKNOWN
246.5705 46.0696 2.4 14.7 -135.8 1.3006 4.7 ------ UNKNOWN
183.5023 12.1576 4.3 55.5 -20.4 3.0020 2.7 ------ UNKNOWN
184.8294 7.5450 3.9 58.9 -24.4 6.6944 3.0 ------ UNKNOWN
285.9965 18.1193 2.6 56.9 -150.6 6.7404 4.5 ------ UNKNOWN
Plot creation:
Sat May 30 17:52:03 EDT 2015