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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.0302 -27.2427 0.0166 57.1060 -4.9451 2.0819189 11.536 TRIG_00653978
Foreground time interval of the image:
-0.584 6.840 (delta_t = 7.424 [sec])
Background time interval of the image:
-47.835 -0.584 (delta_t = 47.251 [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 -0.584 sec. to 6.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89764 ( -0.191063 0.19992 )
Norm@50keV : 2.02625E-02 ( -0.00259979 0.00256623 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.92 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.956754e-01
Photon flux (15-150 keV) in 7.424 sec: 2.90494 ( -0.354131 0.355262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38299e-06 ( -1.74726e-07 1.75858e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.584 sec. to 6.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.521821 ( -1.34273 0.98181 )
Epeak [keV] : 50.7398 ( -9.18518 18.0786 )
Norm@50keV : 0.107622 ( -0.107631 0.454165 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 56 degrees of freedom
# Null hypothesis probability = 3.429694e-01
Photon flux (15-150 keV) in 7.424 sec: 2.76342 ( -0.36929 0.36941 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29094e-06 ( -1.89223e-07 1.90685e-07 ) ergs/cm2
Band function
Time interval is from -0.584 sec. to 6.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.594162 ( -1.85593 2.99559 )
beta : -2.66671 ( 2.66718 0.586155 )
Epeak [keV] : 43.4683 ( -9.40372 17.7203 )
Norm@50keV : 0.504054 ( -0.422264 34.8986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.51 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.477970e-01
Photon flux (15-150 keV) in 7.424 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30166e-06 ( -1.30161e-06 -1.83841e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9218 (-1.37154 1.55406)
R^2/D10^2 : 0.740753 (-0.277985 0.436)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.26 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.114972e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.652e-07 3.463e-08
25- 50 5.160e-07 7.676e-08
50-150 4.390e-07 1.136e-07
15-150 1.120e-06 1.830e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.0666 (-24.2933 42.4943)
Norm : 13.5547 (-2.13863 2.65754)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.30 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.246097e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.620e-07 4.636e-08
25- 50 4.376e-07 5.657e-08
50-150 6.431e-07 2.749e-07
15-150 1.343e-06 2.780e-07
Double BB
R1^2/D10^2 : 1.50632E-02 (-0.008675 0.196116)
kT2 [keV] : 9.25346 (-3.11134 2.15252)
R2^2/D10^2 : 1.49276 (-0.64779 2.323)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.99 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.93 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.72 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 2.410599e-01
# Null hypothesis probability = 2.712805e-01
# Null hypothesis probability = 3.408548e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.253e-07 9.006e-08
25- 50 4.725e-07 1.460e-07
50-150 4.973e-07 1.598e-07
15-150 1.195e-06 3.037e-07
Peak spectrum fit
Power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89867 ( -0.257462 0.280907 )
Norm@50keV : 4.13085E-02 ( -0.00782553 0.00770174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.44 using 59 PHA bins.
# Reduced chi-squared = 1.376 for 57 degrees of freedom
# Null hypothesis probability = 3.136775e-02
Photon flux (15-150 keV) in 1 sec: 5.92470 ( -1.0836 1.0875 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79791e-07 ( -7.0802e-08 7.10663e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.558737 ( -1.35343 1.08085 )
Epeak [keV] : 58.6413 ( -8.93305 30.7122 )
Norm@50keV : 0.183177 ( -0.182105 0.580055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.86 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 56 degrees of freedom
# Null hypothesis probability = 5.515926e-02
Photon flux (15-150 keV) in 1 sec: 5.73710 ( -1.09194 1.09891 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83878e-07 ( -7.1532e-08 7.1927e-08 ) ergs/cm2
Band function
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.560041 ( -0.763453 1.99868 )
beta : -10.0000 ( 10 3.01981e-14 )
Epeak [keV] : 58.6720 ( -15.8871 30.8057 )
Norm@50keV : 0.182876 ( -0.182865 0.578775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.86 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 55 degrees of freedom
# Null hypothesis probability = 4.574108e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85177e-07 ( -3.8517e-07 -7.0048e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.8159 (-2.62537 2.865)
R^2/D10^2 : 0.709707 (-0.348585 0.735305)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.33 using 59 PHA bins.
# Reduced chi-squared = 1.392 for 57 degrees of freedom
# Null hypothesis probability = 2.692206e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.268e-08 1.090e-08
25- 50 1.284e-07 3.550e-08
50-150 1.907e-07 6.520e-08
15-150 3.518e-07 8.885e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 94.5201 (-34.1213 70.9878)
Norm : 27.2064 (-5.95144 7.25225)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.10 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.437394e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.107e-08 1.638e-08
25- 50 1.215e-07 2.413e-08
50-150 1.905e-07 1.064e-07
15-150 3.831e-07 1.188e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.50671 (-2.91176 3.25196)
R1^2/D10^2 : 14.0407 (-11.8358 514.463)
kT2 [keV] : 18.9021 (-3.97956 6.08239)
R2^2/D10^2 : 0.231709 (-0.166467 0.329245)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.93 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 55 degrees of freedom
# Null hypothesis probability = 6.236722e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.578e-08 3.746e-08
25- 50 1.188e-07 6.240e-08
50-150 2.075e-07 1.260e-07
15-150 3.921e-07 2.008e-07
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: 1.89764 ( -0.191063 0.19992 )
Norm@50keV : 2.02625E-02 ( -0.00259979 0.00256623 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.92 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.956754e-01
Photon flux (15-150 keV) in 7.424 sec: 2.90494 ( -0.354131 0.355262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38299e-06 ( -1.74726e-07 1.75858e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.521821 ( -1.34273 0.98181 )
Epeak [keV] : 50.7398 ( -9.18518 18.0786 )
Norm@50keV : 0.107622 ( -0.107631 0.454165 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 56 degrees of freedom
# Null hypothesis probability = 3.429694e-01
Photon flux (15-150 keV) in 7.424 sec: 2.76342 ( -0.36929 0.36941 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29094e-06 ( -1.89223e-07 1.90685e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.594162 ( -1.85593 2.99559 )
beta : -2.66671 ( 2.66718 0.586155 )
Epeak [keV] : 43.4683 ( -9.40372 17.7203 )
Norm@50keV : 0.504054 ( -0.422264 34.8986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.51 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.477970e-01
Photon flux (15-150 keV) in 7.424 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30166e-06 ( -1.30161e-06 -1.83841e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.03e-07
S(50-100 keV) = 4.33e-07
T90 vs. Hardness ratio plot
T90 = 6.17600005865097 sec.
Hardness ratio (energy fluence ratio) = 1.07444
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.46562
Count Ratio (50-100 keV) / (15-25 keV) = 0.849756
Mask shadow pattern
IMX = 1.540364286128175E+00, IMY = 1.332772111267381E-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:
-47.835400 -0.584000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.1105 -37.7977 5.8 56.6 -24.5 -0.7120 -2.0 6.5 4U 1700-377
256.3177 -36.4997 7.6 57.5 -23.4 0.6150 1.5 7.3 GX 349+2
264.8443 -44.3082 204.9 47.4 -23.9 -0.0085 -0.1 9.6 4U 1735-44
275.8213 -30.3519 6.0 52.1 -3.2 0.3768 1.9 5.4 H1820-303
284.9670 -24.9882 6.4 51.6 9.2 -0.4432 -1.8 5.5 HT1900.1-2455
263.0044 -33.8254 6.5 56.2 -16.3 0.5669 1.8 0.9 GX 354-0
52.4709 -30.9631 3.6 54.1 177.1 0.9000 3.2 ------ UNKNOWN
1.6704 -85.4068 2.0 27.9 -98.5 0.5851 5.7 ------ UNKNOWN
240.2067 -60.4971 2.8 46.8 -53.8 1.4451 4.2 ------ UNKNOWN
170.0745 -81.1670 3.1 40.9 -93.3 1.2122 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.584000 6.840000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.8610 -37.9796 19.8 56.6 -24.9 0.0917 0.6 10.1 4U 1700-377
256.5524 -36.3565 515.6 57.5 -23.1 -0.0037 -0.0 6.9 GX 349+2
264.8576 -44.2962 8.4 47.4 -23.8 0.0921 1.4 10.5 4U 1735-44
275.8495 -30.4367 4.5 52.0 -3.2 0.2393 2.5 5.7 H1820-303
285.0960 -24.8491 9.5 51.6 9.4 -0.1335 -1.2 5.4 HT1900.1-2455
263.0457 -33.8261 9.1 56.1 -16.3 -0.1759 -1.3 2.9 GX 354-0
31.2184 -21.1189 2.9 51.1 150.3 0.6959 3.9 ------ UNKNOWN
312.5184 -28.3861 2.4 35.8 37.4 0.2839 4.8 ------ UNKNOWN
310.7138 -35.3702 2.4 30.5 28.7 0.2044 4.8 ------ UNKNOWN
271.0302 -27.2428 1.0 57.1 -4.9 2.0830 11.4 ------ UNKNOWN
83.9144 -48.2427 2.2 56.1 -146.9 0.9459 5.2 ------ UNKNOWN
91.9547 -61.2679 2.5 49.1 -131.9 0.6483 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
837.164600 962.743500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6316 22.0154 0.8 42.2 -48.4 4.6965 14.9 0.1 Crab
53.7467 53.2002 0.7 19.6 -116.6 2.5715 17.3 ------ UNKNOWN
281.3210 80.0797 2.9 57.8 -156.6 2.9106 4.1 ------ UNKNOWN
95.0270 65.0999 2.3 43.3 -114.9 2.6899 5.0 ------ UNKNOWN
Plot creation:
Wed Sep 30 11:05:04 EDT 2015