Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.9232 -14.9282 0.0164 31.9225 58.4326 0.1788433 11.697 TRIG_00821103
Foreground time interval of the image:
0.052 0.264 (delta_t = 0.212 [sec])
Background time interval of the image:
-239.000 -149.576 (delta_t = 89.424 [sec])
-149.000 0.052 (delta_t = 149.052 [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 0.256000
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 0.256000
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 0.256000
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 0.052 sec. to 0.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.515526 ( -0.316857 0.289243 )
Norm@50keV : 4.96249E-02 ( -0.00849594 0.00808563 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.80 using 59 PHA bins.
# Reduced chi-squared = 0.9789 for 57 degrees of freedom
# Null hypothesis probability = 5.202372e-01
Photon flux (15-150 keV) in 0.212 sec: 0.597222 ( -0.279627 0.658038 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40254e-07 ( -2.15663e-08 2.16605e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 0.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.505138 ( -0.731149 0.400524 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.00373E-02 ( -0.00778375 0.0409585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9969 for 56 degrees of freedom
# Null hypothesis probability = 4.813895e-01
Photon flux (15-150 keV) in 0.212 sec: 5.86152 ( -0.86043 0.86049 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 0.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.967776 ( 0.967776 0.967776 )
beta : -0.515509 ( -0.289277 0.316847 )
Epeak [keV] : 12.9698 ( -12.9698 -12.9698 )
Norm@50keV : 7.33631E-02 ( -0.0331703 590767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.80 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.446094e-01
Photon flux (15-150 keV) in 0.212 sec: 5.86250 ( -0.85929 0.86217 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40203e-07 ( -2.15668e-08 2.16634e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.2002 (-8.21061 14.0957)
R^2/D10^2 : 6.00158E-02 (-0.0336119 0.062424)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.30 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.639382e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.224e-09 7.101e-10
25- 50 1.457e-08 4.464e-09
50-150 1.177e-07 3.649e-08
15-150 1.345e-07 3.656e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-30.1302 -200)
Norm : 21.4084 (-3.52414 3.52414)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.29 using 59 PHA bins.
# Reduced chi-squared = 1.584 for 57 degrees of freedom
# Null hypothesis probability = 3.276108e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.140e-08 6.599e-09
25- 50 2.193e-08 1.265e-08
50-150 4.808e-08 2.779e-08
15-150 8.141e-08 4.600e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.51426 (-1.89055 8.73879)
R1^2/D10^2 : 61.9692 (-61.608 11473.8)
kT2 [keV] : 41.9799 (-11.3596 -41.9799)
R2^2/D10^2 : 3.73699E-02 (-0.0253524 0.0453722)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.86 using 59 PHA bins.
# Reduced chi-squared = 0.9974 for 55 degrees of freedom
# Null hypothesis probability = 4.801168e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.893e-09 4.305e-09
25- 50 1.354e-08 5.020e-09
50-150 1.219e-07 5.511e-08
15-150 1.433e-07 5.764e-08
Peak spectrum fit
Power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.878314 ( -0.323531 0.299732 )
Norm@50keV : 1.58363E-02 ( -0.00274569 0.00267849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.87 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.176912e-01
Photon flux (15-150 keV) in 1 sec: 1.81748 ( -0.30862 0.31115 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79263e-07 ( -3.03509e-08 3.05247e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.871354 ( -1.19183 0.396917 )
Epeak [keV] : 9998.85 ( -9998.85 -9998.85 )
Norm@50keV : 1.59414E-02 ( -0.00257423 0.0326926 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.87 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 56 degrees of freedom
# Null hypothesis probability = 1.006486e-01
Photon flux (15-150 keV) in 1 sec: 1.82001 ( -0.32117 0.30841 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79461e-07 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.791758 ( 0.791758 0.791758 )
beta : -0.878349 ( -0.299273 0.323532 )
Epeak [keV] : 19.8174 ( -19.8237 -19.8237 )
Norm@50keV : 2.35063E-02 ( -0.0102466 498455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.87 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 55 degrees of freedom
# Null hypothesis probability = 8.541700e-02
Photon flux (15-150 keV) in 1 sec: 1.81748 ( -0.30862 0.31115 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79263e-07 ( -3.03509e-08 3.05247e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.5823 (-5.72487 8.65291)
R^2/D10^2 : 3.68617E-02 (-0.0205049 0.0405076)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.01 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 57 degrees of freedom
# Null hypothesis probability = 4.697732e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.376e-09 1.735e-09
25- 50 2.559e-08 9.050e-09
50-150 1.326e-07 4.413e-08
15-150 1.625e-07 5.383e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.854 -200)
Norm : 7.54229 (-1.2894 1.2894)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.05 using 59 PHA bins.
# Reduced chi-squared = 1.474 for 57 degrees of freedom
# Null hypothesis probability = 1.140446e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.878e-08 1.091e-08
25- 50 3.613e-08 2.083e-08
50-150 7.923e-08 4.468e-08
15-150 1.341e-07 7.565e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.77396 (-3.33394 5.24597)
R1^2/D10^2 : 1.39096 (-1.2485 20.2261)
kT2 [keV] : 36.1916 (-10.7906 55.1979)
R2^2/D10^2 : 1.37899E-02 (-0.012147 0.0261885)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.13 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.523425e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.240e-08 7.230e-09
25- 50 2.924e-08 1.510e-08
50-150 1.407e-07 7.820e-08
15-150 1.823e-07 9.400e-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: 0.515526 ( -0.316857 0.289243 )
Norm@50keV : 4.96249E-02 ( -0.00849594 0.00808563 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.80 using 59 PHA bins.
# Reduced chi-squared = 0.9789 for 57 degrees of freedom
# Null hypothesis probability = 5.202372e-01
Photon flux (15-150 keV) in 0.212 sec: 5.86257 ( -0.859292 0.862172 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40239e-07 ( -2.15625e-08 2.16672e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.505260 ( -0.728199 0.401332 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.00346E-02 ( -0.00852802 0.00705926 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9969 for 56 degrees of freedom
# Null hypothesis probability = 4.813896e-01
Photon flux (15-150 keV) in 0.212 sec: 5.87484 ( -0.86927 0.8497 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40415e-07 ( -2.15759e-08 2.12401e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.967776 ( 0.967776 0.967776 )
beta : -0.515509 ( -0.289277 0.316847 )
Epeak [keV] : 12.9698 ( -12.9698 -12.9698 )
Norm@50keV : 7.33631E-02 ( -0.0331703 590767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.80 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.446094e-01
Photon flux (15-150 keV) in 0.212 sec: 5.86250 ( -0.85929 0.86217 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40203e-07 ( -2.15668e-08 2.16634e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.82e-08
S(50-100 keV) = 5.11e-08
T90 vs. Hardness ratio plot
T90 = 0.179999947547913 sec.
Hardness ratio (energy fluence ratio) = 2.80769
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.4114
Count Ratio (50-100 keV) / (15-25 keV) = 2.35714
Mask shadow pattern
IMX = 3.261370498094933E-01, IMY = -5.308038167059512E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.000000 -149.575500
-149.000000 0.052000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9522 -15.6651 1.7 37.6 64.8 7.5475 6.9 2.2 Sco X-1
254.4379 35.2419 5.4 33.9 161.1 1.2942 2.2 6.1 Her X-1
255.8876 -37.7690 12.5 48.4 32.7 1.5207 0.9 6.5 4U 1700-377
256.6101 -36.4735 13.7 47.0 32.8 -1.1775 -0.8 9.0 GX 349+2
262.9563 -24.6065 7.1 33.9 32.4 1.0247 1.6 8.8 GX 1+4
264.7376 -44.4718 4.7 52.5 21.7 5.0509 2.4 1.3 4U 1735-44
268.3518 -1.4538 120.3 11.0 50.7 -0.0387 -0.1 1.0 SW J1753.5-0127
270.3092 -24.9955 20.0 32.5 20.5 0.2965 0.6 5.2 GX 5-1
270.2632 -25.7402 7.0 33.3 20.4 0.9100 1.7 2.1 GRS 1758-258
273.9911 -14.0096 5.0 21.2 15.4 1.0103 2.3 1.8 GX 17+2
276.1084 -30.4898 0.0 37.7 11.0 -0.1117 -0.2 12.0 H1820-303
284.8996 -24.9367 3.7 33.5 -3.8 -1.6141 -3.1 7.5 HT1900.1-2455
288.8063 10.9550 1.6 14.0 -94.3 3.7874 7.3 0.7 GRS 1915+105
299.5903 35.1746 1.6 35.9 -132.4 4.8912 7.2 1.6 Cyg X-1
308.1035 40.8231 9.1 44.6 -131.8 1.4968 1.3 7.8 Cyg X-3
263.1897 -33.9692 0.0 42.7 27.0 0.5734 0.6 12.8 GX 354-0
277.1914 -45.6625 2.4 52.9 10.5 7.9534 4.8 ------ UNKNOWN
289.3128 -45.6920 2.4 54.4 0.2 7.3049 4.9 ------ UNKNOWN
275.0862 7.1811 0.1 0.1 94.2 36.1748 89.3 ------ UNKNOWN
272.0489 44.7307 3.0 37.6 -171.3 2.3034 3.9 ------ UNKNOWN
295.8386 -31.1340 2.9 43.1 -13.9 2.6980 4.1 ------ UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.052000 0.264000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9451 -15.5175 9.2 37.6 65.0 -0.0309 -1.3 7.6 Sco X-1
254.6503 35.2490 9.7 33.8 161.4 -0.0136 -1.2 11.0 Her X-1
256.1085 -37.8262 3.3 48.4 32.5 -0.1286 -3.5 5.9 4U 1700-377
256.4592 -36.5346 4.2 47.1 32.9 0.0861 2.7 6.8 GX 349+2
263.0433 -24.8863 3.8 34.2 32.1 0.0391 3.0 8.6 GX 1+4
264.5844 -44.4358 43.0 52.5 21.8 -0.0134 -0.3 6.8 4U 1735-44
268.2814 -1.6229 6.0 11.2 50.4 0.0158 1.9 11.5 SW J1753.5-0127
270.0996 -24.9553 0.0 32.5 20.9 -0.0323 -3.0 12.5 GX 5-1
270.3218 -25.8893 7.0 33.4 20.2 -0.0180 -1.6 8.8 GRS 1758-258
273.8896 -13.9118 4.4 21.1 15.7 0.0206 2.6 10.1 GX 17+2
275.7632 -30.3126 6.0 37.5 11.5 0.0238 1.9 9.0 H1820-303
285.2071 -25.0349 0.0 33.7 -4.2 -0.0075 -0.7 11.6 HT1900.1-2455
288.7841 11.0909 6.0 14.0 -94.8 -0.0152 -1.9 8.8 GRS 1915+105
299.5898 35.2019 82.1 35.9 -132.4 0.0015 0.1 0.0 Cyg X-1
308.2766 41.0139 9.2 44.8 -131.9 0.0252 1.3 8.4 Cyg X-3
262.8897 -33.7553 7.5 42.6 27.5 -0.0289 -1.5 6.9 GX 354-0
251.9232 -14.9283 1.0 31.9 58.4 0.1790 11.7 ------ UNKNOWN
251.0619 51.3984 2.4 48.5 172.5 0.1009 4.8 ------ UNKNOWN
308.8560 -30.9901 2.3 50.0 -26.1 0.0826 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
63.500600 963.038100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9792 -15.6423 0.3 6.7 80.7 43.8426 34.1 0.1 Sco X-1
254.5608 35.3551 11.3 50.4 -179.9 3.5423 1.0 5.1 Her X-1
255.8052 -37.9936 0.0 23.3 -10.5 -0.6361 -0.5 12.4 4U 1700-377
256.2642 -36.3530 15.0 21.7 -12.2 0.9934 0.8 9.3 GX 349+2
263.0819 -24.8908 14.6 14.4 -47.5 -1.0363 -0.8 9.6 GX 1+4
264.8746 -44.5874 57.3 31.6 -20.4 0.3319 0.2 10.0 4U 1735-44
268.2179 -1.3020 0.0 21.1 -131.6 2.1296 1.5 12.8 SW J1753.5-0127
270.2447 -25.1414 3.0 20.0 -59.2 5.2132 3.9 4.3 GX 5-1
270.3235 -25.6741 11.9 20.3 -57.9 1.4657 1.1 4.3 GRS 1758-258
273.8590 -14.1831 0.0 21.2 -92.0 1.6557 1.0 12.3 GX 17+2
275.7693 -30.5323 0.0 26.8 -53.2 2.5437 1.5 12.8 H1820-303
285.1808 -24.7594 0.0 32.7 -70.0 0.3771 0.2 12.5 HT1900.1-2455
288.7790 10.9415 2.6 44.8 -126.0 20.8417 4.4 1.2 GRS 1915+105
263.0638 -33.9787 9.1 21.5 -28.6 -1.7245 -1.3 9.4 GX 354-0
207.6754 -35.8224 3.8 44.6 51.0 19.2081 3.0 ------ UNKNOWN
220.8690 -51.0914 3.6 43.9 25.2 8.7014 3.2 ------ UNKNOWN
229.9545 -37.2105 3.1 29.6 34.4 5.9156 3.7 ------ UNKNOWN
235.3151 -8.3776 2.5 17.5 107.6 6.4819 4.6 ------ UNKNOWN
263.7755 -19.6528 3.3 12.2 -68.6 4.3296 3.5 ------ UNKNOWN
265.2154 -66.8190 2.4 52.6 -9.2 16.0901 4.8 ------ UNKNOWN
269.0468 8.0981 2.7 28.6 -145.2 6.3737 4.3 ------ UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Wed May 30 17:08:07 EDT 2018