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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
289.3734 32.5282 0.0085 13.0251 25.8165 0.9308752 22.695 TRIG_00624606
Foreground time interval of the image:
-7.940 3.772 (delta_t = 11.712 [sec])
Background time interval of the image:
-239.072 -7.940 (delta_t = 231.132 [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 -7.940 sec. to 3.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88697 ( -0.131264 0.135232 )
Norm@50keV : 4.56756E-03 ( -0.000388535 0.000383116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.71 using 59 PHA bins.
# Reduced chi-squared = 0.8722 for 57 degrees of freedom
# Null hypothesis probability = 7.424069e-01
Photon flux (15-150 keV) in 11.71 sec: 0.651896 ( -0.046872 0.0468991 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91698e-07 ( -4.11405e-08 4.16705e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.940 sec. to 3.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29384 ( -0.624433 0.542655 )
Epeak [keV] : 51.6539 ( -11.3912 73.7336 )
Norm@50keV : 9.81828E-03 ( -0.00486014 0.0120564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8249 for 56 degrees of freedom
# Null hypothesis probability = 8.219657e-01
Photon flux (15-150 keV) in 11.71 sec: 0.634659 ( -0.049317 0.049325 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63087e-07 ( -4.73541e-08 4.86902e-08 ) ergs/cm2
Band function
Time interval is from -7.940 sec. to 3.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29384 ( 1.38551 0.362679 )
beta : -10.00000 ( 10 7.10543e-15 )
Epeak [keV] : 51.6439 ( -11.1342 73.7086 )
Norm@50keV : 9.81702E-03 ( -0.00069641 0.0120864 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8399 for 55 degrees of freedom
# Null hypothesis probability = 7.951992e-01
Photon flux (15-150 keV) in 11.71 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.641e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7842 (-0.931289 1.02847)
R^2/D10^2 : 0.227849 (-0.0663955 0.0930847)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.11 using 59 PHA bins.
# Reduced chi-squared = 1.423 for 57 degrees of freedom
# Null hypothesis probability = 1.964929e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.456e-08 8.419e-09
25- 50 1.779e-07 1.470e-08
50-150 1.151e-07 2.169e-08
15-150 3.576e-07 3.267e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 81.5551 (-17.8005 26.6977)
Norm : 3.03642 (-0.323784 0.375504)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.16 using 59 PHA bins.
# Reduced chi-squared = 0.8098 for 57 degrees of freedom
# Null hypothesis probability = 8.472146e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.237e-08 9.450e-09
25- 50 1.528e-07 1.200e-08
50-150 2.184e-07 6.891e-08
15-150 4.636e-07 7.471e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.10950 (-1.28478 1.42043)
R1^2/D10^2 : 1.28486 (-0.6407 1.69929)
kT2 [keV] : 19.6038 (-4.02427 7.45392)
R2^2/D10^2 : 1.69438E-02 (-0.012227 0.0272958)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.37 using 59 PHA bins.
# Reduced chi-squared = 0.8249 for 55 degrees of freedom
# Null hypothesis probability = 8.195005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.136e-08 2.839e-08
25- 50 1.522e-07 4.141e-08
50-150 2.146e-07 1.084e-07
15-150 4.582e-07 1.523e-07
Peak spectrum fit
Power-law model
Time interval is from 1.736 sec. to 2.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35791 ( -0.195977 0.195974 )
Norm@50keV : 1.13097E-02 ( -0.00131682 0.00131204 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.84 using 59 PHA bins.
# Reduced chi-squared = 0.7866 for 57 degrees of freedom
# Null hypothesis probability = 8.786311e-01
Photon flux (15-150 keV) in 1 sec: 1.36473 ( -0.15813 0.158279 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10265e-07 ( -1.43524e-08 1.45249e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.736 sec. to 2.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.946666 ( -0.900925 0.512136 )
Epeak [keV] : 126.865 ( -60.5227 -126.876 )
Norm@50keV : 1.83868E-02 ( -0.00813564 0.0337032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.00 using 59 PHA bins.
# Reduced chi-squared = 0.7857 for 56 degrees of freedom
# Null hypothesis probability = 8.774929e-01
Photon flux (15-150 keV) in 1 sec: 1.34366 ( -0.16244 0.16302 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06615e-07 ( -1.62149e-08 1.606e-08 ) ergs/cm2
Band function
Time interval is from 1.736 sec. to 2.736 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.74507 ( -4.74507 -4.74507 )
beta : -1.52933 ( -0.26884 0.246181 )
Epeak [keV] : 29.0190 ( -7.19131 6.41074 )
Norm@50keV : 299.797 ( -34.0623 3.73081e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.51 using 59 PHA bins.
# Reduced chi-squared = 0.7728 for 55 degrees of freedom
# Null hypothesis probability = 8.907912e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07255e-07 ( -1.07248e-07 -1.50666e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.5628 (-2.21346 2.66381)
R^2/D10^2 : 0.140677 (-0.058755 0.0979338)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.75 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.473533e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.086e-09 1.543e-09
25- 50 2.911e-08 4.595e-09
50-150 4.874e-08 1.148e-08
15-150 8.493e-08 1.347e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.62176 (-0.645051 0.645018)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.50 using 59 PHA bins.
# Reduced chi-squared = 0.8157 for 57 degrees of freedom
# Null hypothesis probability = 8.384846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.400e-08 7.805e-09
25- 50 2.693e-08 1.495e-08
50-150 5.906e-08 3.244e-08
15-150 9.999e-08 5.545e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.33261 (-3.11849 4.31935)
R1^2/D10^2 : 0.771076 (-0.524746 1.04176)
kT2 [keV] : 31.1748 (-11.7388 -31.3013)
R2^2/D10^2 : 1.00109E-02 (-0.00926365 0.0450233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.55 using 59 PHA bins.
# Reduced chi-squared = 0.7918 for 55 degrees of freedom
# Null hypothesis probability = 8.672781e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.145e-08 6.100e-09
25- 50 2.800e-08 1.290e-08
50-150 6.850e-08 3.686e-08
15-150 1.079e-07 5.510e-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: 1.88697 ( -0.131264 0.135232 )
Norm@50keV : 4.56756E-03 ( -0.000388535 0.000383116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.71 using 59 PHA bins.
# Reduced chi-squared = 0.8722 for 57 degrees of freedom
# Null hypothesis probability = 7.424069e-01
Photon flux (15-150 keV) in 11.71 sec: 0.651896 ( -0.046872 0.0468991 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91698e-07 ( -4.11405e-08 4.16705e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29384 ( -0.624433 0.542655 )
Epeak [keV] : 51.6539 ( -11.3912 73.7336 )
Norm@50keV : 9.81828E-03 ( -0.00486014 0.0120564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8249 for 56 degrees of freedom
# Null hypothesis probability = 8.219657e-01
Photon flux (15-150 keV) in 11.71 sec: 0.634659 ( -0.049317 0.049325 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63087e-07 ( -4.73541e-08 4.86902e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29384 ( 1.38551 0.362679 )
beta : -10.00000 ( 10 5.50671e-14 )
Epeak [keV] : 51.6439 ( -11.1342 73.7086 )
Norm@50keV : 9.81702E-03 ( -0.00069641 0.0120864 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8399 for 55 degrees of freedom
# Null hypothesis probability = 7.951992e-01
Photon flux (15-150 keV) in 11.71 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.641e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.43e-07
S(50-100 keV) = 1.54e-07
T90 vs. Hardness ratio plot
T90 = 10.5799999833107 sec.
Hardness ratio (energy fluence ratio) = 1.07692
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.16083
Count Ratio (50-100 keV) / (15-25 keV) = 0.636006
Mask shadow pattern
IMX = 2.082417405171726E-01, IMY = -1.007420848035764E-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:
-239.072000 -7.940000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4765 35.3722 2.9 41.9 20.8 1.7946 4.0 2.0 Her X-1
268.2726 -1.4290 22.1 43.7 -37.9 0.1813 0.5 5.9 SW J1753.5-0127
288.7918 10.9322 0.7 20.7 -50.7 3.3020 15.6 0.9 GRS 1915+105
299.5873 35.2032 0.4 8.8 68.9 6.5573 30.5 0.2 Cyg X-1
308.1246 40.9526 1.9 14.7 102.5 1.3552 6.2 0.7 Cyg X-3
326.0878 38.4050 4.1 22.6 140.3 0.7052 2.8 6.4 Cyg X-2
329.7395 -2.6541 2.2 39.3 -138.6 1.6248 5.2 ------ UNKNOWN
305.0155 -3.3717 2.6 30.3 -97.4 1.3518 4.5 ------ UNKNOWN
354.4824 -4.2992 3.4 58.7 -159.3 4.9156 3.4 419.4 UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-7.940000 3.772000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4088 35.1861 6.1 42.0 20.6 -0.1588 -1.9 9.7 Her X-1
268.3603 -1.5783 6.8 43.8 -38.2 0.1273 1.7 7.6 SW J1753.5-0127
288.7335 10.8525 3.9 20.8 -50.7 -0.1225 -3.0 6.8 GRS 1915+105
299.4592 35.2830 3.0 8.9 68.4 0.1545 3.9 8.1 Cyg X-1
308.0074 41.1122 6.1 14.9 102.0 0.0826 1.9 10.6 Cyg X-3
326.2841 38.4434 5.7 22.7 140.3 -0.0979 -2.0 9.0 Cyg X-2
289.3734 32.5282 0.5 13.0 25.8 0.9310 22.7 ------ UNKNOWN
348.6143 7.5567 2.4 47.4 -167.8 0.3569 4.8 ------ UNKNOWN
256.3014 1.6397 1.8 51.3 -24.6 0.6413 6.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
45.028600 962.975100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4730 35.3656 1.5 28.9 18.6 6.1520 7.8 1.6 Her X-1
268.3487 -1.4498 9.2 39.3 -52.4 1.4489 1.3 1.2 SW J1753.5-0127
288.7940 10.9596 0.7 21.6 -85.3 12.7646 17.1 0.9 GRS 1915+105
299.5864 35.2051 0.3 8.9 162.8 24.9694 43.1 0.3 Cyg X-1
308.0607 40.9494 1.5 17.1 148.4 5.2745 7.8 2.3 Cyg X-3
326.1675 38.2737 2.3 30.3 161.8 4.6631 5.1 2.9 Cyg X-2
301.8170 36.6465 2.6 11.0 157.8 2.5384 4.5 ------ UNKNOWN
347.7662 8.3058 4.0 59.0 -166.3 12.5741 2.9 ------ UNKNOWN
319.4540 -6.0340 3.1 48.0 -128.9 9.9584 3.8 ------ UNKNOWN
Plot creation:
Thu May 28 13:42:16 EDT 2015