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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
0.9265 -52.9715 0.0076 20.9015 -11.1292 2.0499812 25.233 TRIG_00255445
Foreground time interval of the image:
-2.744 40.637 (delta_t = 43.381 [sec])
Background time interval of the image:
-57.563 -2.744 (delta_t = 54.819 [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 3.072000
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 3.072000
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 3.072000
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 -2.744 sec. to 108.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56663 ( -0.11284 0.113635 )
Norm@50keV : 1.56081E-03 ( -9.54675e-05 9.49271e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.86 using 59 PHA bins.
# Reduced chi-squared = 0.6466 for 57 degrees of freedom
# Null hypothesis probability = 9.823697e-01
Photon flux (15-150 keV) in 110.9 sec: 0.198554 ( -0.0119193 0.0119584 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62576e-06 ( -1.08748e-07 1.09641e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.744 sec. to 108.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56928 ( -0.259665 0.11142 )
Epeak [keV] : 9999.31 ( -9999.36 -9999.36 )
Norm@50keV : 1.55564E-03 ( -0.000713982 0.000555079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.90 using 59 PHA bins.
# Reduced chi-squared = 0.6589 for 56 degrees of freedom
# Null hypothesis probability = 9.772045e-01
Photon flux (15-150 keV) in 110.9 sec: 0.198467 ( -0.011897 0.011943 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62551e-06 ( -5.47402e-08 1.06641e-07 ) ergs/cm2
Band function
Time interval is from -2.744 sec. to 108.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28004 ( 1.28004 1.28004 )
beta : -1.56662 ( -0.113695 0.112708 )
Epeak [keV] : 26.1539 ( -26.1557 -26.1557 )
Norm@50keV : 3.25920E-03 ( -0.00129853 0.221779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.86 using 59 PHA bins.
# Reduced chi-squared = 0.6702 for 55 degrees of freedom
# Null hypothesis probability = 9.714273e-01
Photon flux (15-150 keV) in 110.9 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] : 14.2911 ( )
R^2/D10^2 : 2.50911E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 122.55 using 59 PHA bins.
# Reduced chi-squared = 2.1499 for 57 degrees of freedom
# Null hypothesis probability = 1.071480e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.198e-07 1.383e-08
25- 50 4.546e-07 3.222e-08
50-150 6.177e-07 7.780e-08
15-150 1.192e-06 8.340e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.216 (-52.2401 -199.289)
Norm : 0.800249 (-0.0460893 0.0473632)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.15 using 59 PHA bins.
# Reduced chi-squared = 0.7045 for 57 degrees of freedom
# Null hypothesis probability = 9.557077e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.210e-07 1.686e-08
25- 50 4.251e-07 4.031e-08
50-150 9.321e-07 2.209e-07
15-150 1.578e-06 2.734e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.49514 (-1.26802 1.4626)
R1^2/D10^2 : 0.291506 (-0.146114 0.363702)
kT2 [keV] : 27.6891 (-5.40419 10.1015)
R2^2/D10^2 : 2.07510E-03 (-0.0013162 0.00239115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.64 using 59 PHA bins.
# Reduced chi-squared = 0.7571 for 55 degrees of freedom
# Null hypothesis probability = 9.081373e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.303e-07 4.708e-08
25- 50 4.100e-07 7.175e-08
50-150 9.898e-07 2.597e-07
15-150 1.630e-06 3.380e-07
Peak spectrum fit
Power-law model
Time interval is from -0.768 sec. to 0.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46378 ( -0.337905 0.34199 )
Norm@50keV : 4.95676E-03 ( -0.00101083 0.000996386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.02 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.376484e-01
Photon flux (15-150 keV) in 1 sec: 0.612967 ( -0.119773 0.11991 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.73141e-08 ( -1.05492e-08 1.08316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.768 sec. to 0.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986413 ( -1.90256 0.804703 )
Epeak [keV] : 99.0413 ( -99.1669 -99.1669 )
Norm@50keV : 8.94256E-03 ( -0.00491066 0.0851642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.68 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 56 degrees of freedom
# Null hypothesis probability = 4.127833e-01
Photon flux (15-150 keV) in 1 sec: 0.601219 ( -0.125851 0.123225 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50577e-08 ( -1.23982e-08 1.24196e-08 ) ergs/cm2
Band function
Time interval is from -0.768 sec. to 0.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.387731 ( 0.530068 5.45875 )
beta : -1.79077 ( 1.80303 0.627024 )
Epeak [keV] : 59.7054 ( -59.5361 180.45 )
Norm@50keV : 2.09844E-02 ( -0.0219934 170.596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.27 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.909608e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.51407e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6699 (-2.93229 4.08421)
R^2/D10^2 : 9.71768E-02 (-0.058534 0.132035)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.79 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.091460e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.843e-09 1.618e-09
25- 50 1.395e-08 5.128e-09
50-150 1.696e-08 7.631e-09
15-150 3.476e-08 1.253e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-109.504 -199.363)
Norm : 2.51432 (-0.486418 0.486453)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.85 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.436342e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.261e-09 3.655e-09
25- 50 1.204e-08 6.920e-09
50-150 2.641e-08 1.513e-08
15-150 4.472e-08 2.538e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.3069 (-6.90593 4.13333)
R1^2/D10^2 : 0.220321 ( )
kT2 [keV] : 76.0132 (-80.3064 -80.3065)
R2^2/D10^2 : 3.46940E-04 (-0.000258591 0.0748803)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.27 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.25 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.908624e-01
# Null hypothesis probability = 3.917281e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.068e-09 2.937e-09
25- 50 1.358e-08 8.445e-09
50-150 2.786e-08 1.363e-08
15-150 4.651e-08 2.270e-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: 1.57707 ( -0.0964588 0.0971689 )
Norm@50keV : 3.00802E-03 ( -0.000160569 0.000159941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.43 using 59 PHA bins.
# Reduced chi-squared = 0.7969 for 57 degrees of freedom
# Null hypothesis probability = 8.651913e-01
Photon flux (15-150 keV) in 43.38 sec: 0.383850 ( -0.0203593 0.0203951 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22388e-06 ( -7.08621e-08 7.13354e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36476 ( -0.39919 0.261017 )
Epeak [keV] : 148.308 ( )
Norm@50keV : 3.84884E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.47 using 59 PHA bins.
# Reduced chi-squared = 0.7942 for 56 degrees of freedom
# Null hypothesis probability = 8.665496e-01
Photon flux (15-150 keV) in 43.38 sec: 0.378823 ( -0.022081 0.022061 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20068e-06 ( -8.22658e-08 8.0856e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22376 ( 1.23212 1.23212 )
beta : -1.72821 ( 1.72757 0.224619 )
Epeak [keV] : 97.8828 ( -101.945 -101.945 )
Norm@50keV : 4.65408E-03 ( -0.00156817 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.32 using 59 PHA bins.
# Reduced chi-squared = 0.8058 for 55 degrees of freedom
# Null hypothesis probability = 8.480489e-01
Photon flux (15-150 keV) in 43.38 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) = 4.15e-07
S(50-100 keV) = 5.60e-07
T90 vs. Hardness ratio plot
T90 = 88.4280000030994 sec.
Hardness ratio (energy fluence ratio) = 1.3494
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.17336
Count Ratio (50-100 keV) / (15-25 keV) = 0.893607
Mask shadow pattern
IMX = 3.747115588397704E-01, IMY = 7.371383709429975E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
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:
-57.563390 -2.744000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5862 -60.5548 4.5 45.3 172.6 0.3372 2.6 9.0 Cen X-3
186.6460 -62.7570 1.0 43.8 -176.3 1.2888 11.4 0.9 GX 301-2
59.3413 -39.1628 2.3 41.1 67.9 1.4723 5.0 ------ UNKNOWN
20.5945 -23.8590 2.0 49.8 17.8 1.1835 5.6 ------ UNKNOWN
0.3709 -29.3229 2.2 44.5 -7.0 0.6108 5.3 ------ UNKNOWN
332.7147 -58.7232 2.9 20.8 -59.2 0.2839 3.9 ------ UNKNOWN
320.6046 -43.8706 2.6 37.4 -60.1 0.6053 4.4 ------ UNKNOWN
227.2316 -48.9431 4.2 55.2 -145.2 1.0934 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.744000 40.636630
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4687 -60.4944 4.2 45.4 172.5 -0.4294 -2.8 8.9 Cen X-3
186.7246 -62.8424 2.9 43.7 -176.2 0.5550 4.0 4.7 GX 301-2
13.0809 -54.7567 2.7 18.7 9.8 0.3669 4.3 ------ UNKNOWN
0.9265 -52.9715 0.5 20.9 -11.1 2.0498 25.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
82.836600 675.136600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
154.7604 -70.4778 2.9 55.1 167.6 6.6128 4.0 ------ UNKNOWN
11.1207 -45.7881 2.6 9.7 44.7 1.2444 4.5 ------ UNKNOWN
183.8820 -70.1001 2.8 56.9 179.1 7.0378 4.2 ------ UNKNOWN
246.8515 -70.8570 3.0 47.7 -158.2 2.5203 3.8 ------ UNKNOWN
337.4561 -19.3369 2.7 38.2 -39.5 2.1996 4.2 ------ UNKNOWN
250.6617 -58.3629 7.6 55.2 -145.3 3.8976 1.5 ------ UNKNOWN
Plot creation:
Sun May 31 11:01:26 EDT 2015