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
112.7662 17.0235 0.0138 19.6953 61.4634 0.4841346 13.918 TRIG_00679120
Foreground time interval of the image:
-0.036 9.312 (delta_t = 9.348 [sec])
Background time interval of the image:
-239.776 -0.036 (delta_t = 239.740 [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 2.048000
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 2.048000
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 2.048000
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 -0.036 sec. to 9.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52836 ( -0.219949 0.222498 )
Norm@50keV : 3.11909E-03 ( -0.00040331 0.000398262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.83 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.773965e-01
Photon flux (15-150 keV) in 9.348 sec: 0.392441 ( -0.04844 0.048497 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75403e-07 ( -3.89101e-08 3.94866e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 9.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52962 ( -0.22448 0.220702 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.12120E-03 ( -0.00225277 0.00435825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.470212e-01
Photon flux (15-150 keV) in 9.348 sec: 0.393417 ( -0.051805 0.049339 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77958e-07 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 9.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97190 ( -4.9719 -4.9719 )
beta : -1.58003 ( -0.254135 0.238444 )
Epeak [keV] : 21.4774 ( -21.4774 7.3369 )
Norm@50keV : 837.881 ( -101.843 1.82197e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.34 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.314260e-01
Photon flux (15-150 keV) in 9.348 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] : 13.5626 (-2.08787 2.57008)
R^2/D10^2 : 6.17573E-02 (-0.0284018 0.0505913)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.14 using 59 PHA bins.
# Reduced chi-squared = 1.441 for 57 degrees of freedom
# Null hypothesis probability = 1.629103e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.249e-08 5.623e-09
25- 50 8.099e-08 1.446e-08
50-150 9.646e-08 2.703e-08
15-150 1.999e-07 3.706e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.351 (-86.991 -199.361)
Norm : 1.59786 (-0.194803 0.195005)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.56 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.564213e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.719e-08 2.108e-08
25- 50 7.155e-08 3.928e-08
50-150 1.569e-07 8.638e-08
15-150 2.657e-07 1.467e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.78542 (-4.6981 2.43947)
R1^2/D10^2 : 0.170749 (-0.105674 1.74539)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 5.30237E-05 (-1.64161e-05 0.00019818)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.03 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.99 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Reduced chi-squared = 1.163 for 55 degrees of freedom
# Null hypothesis probability = 1.893062e-01
# Null hypothesis probability = 1.902679e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.279e-08 1.257e-08
25- 50 7.845e-08 3.157e-08
50-150 1.701e-07 1.090e-07
15-150 2.813e-07 1.547e-07
Peak spectrum fit
Power-law model
Time interval is from 1.120 sec. to 2.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50511 ( -0.327818 0.325436 )
Norm@50keV : 7.26617E-03 ( -0.00128593 0.00125803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.97 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.329721e-01
Photon flux (15-150 keV) in 1 sec: 0.908380 ( -0.153933 0.15404 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.88811e-08 ( -1.34006e-08 1.36428e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.120 sec. to 2.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50428 ( -0.45031 0.303865 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.28521E-03 ( -0.00129489 -0.00728523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.99 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 56 degrees of freedom
# Null hypothesis probability = 1.140564e-01
Photon flux (15-150 keV) in 1 sec: 0.918153 ( -0.159414 0.146057 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83469e-08 ( -1.50172e-08 1.13856e-08 ) ergs/cm2
Band function
Time interval is from 1.120 sec. to 2.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.89992 ( -4.89992 -4.89992 )
beta : -1.59707 ( -0.454866 0.36653 )
Epeak [keV] : 22.9660 ( -22.966 7.15583 )
Norm@50keV : 1128.74 ( -186.918 4.66238e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.32 using 59 PHA bins.
# Reduced chi-squared = 1.242 for 55 degrees of freedom
# Null hypothesis probability = 1.071050e-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] : 10.6406 (-2.6356 4.79223)
R^2/D10^2 : 0.324024 (-0.319017 0.612601)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.70 using 59 PHA bins.
# Reduced chi-squared = 1.556 for 57 degrees of freedom
# Null hypothesis probability = 4.548511e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.609e-09 2.961e-09
25- 50 2.060e-08 5.235e-09
50-150 1.283e-08 6.201e-09
15-150 4.104e-08 1.265e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-99.5538 -199.362)
Norm : 3.68005 (-0.617403 0.618369)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.98 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 57 degrees of freedom
# Null hypothesis probability = 1.008490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.164e-09 5.260e-09
25- 50 1.763e-08 1.008e-08
50-150 3.866e-08 2.168e-08
15-150 6.545e-08 3.633e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.28606 (-1.41282 2.0277)
R1^2/D10^2 : 1.17908 (-0.843034 1.79642)
kT2 [keV] : 200.000 (-157.351 -200)
R2^2/D10^2 : 1.72897E-04 (-4.89409e-05 4.89213e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.35 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.03 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 55 degrees of freedom
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 2.885476e-01
# Null hypothesis probability = 2.985407e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.080e-08 5.169e-09
25- 50 1.704e-08 9.035e-09
50-150 5.009e-08 4.745e-08
15-150 7.792e-08 5.645e-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: 1.52836 ( -0.219949 0.222498 )
Norm@50keV : 3.11909E-03 ( -0.00040331 0.000398262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.83 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.773965e-01
Photon flux (15-150 keV) in 9.348 sec: 0.392430 ( -0.048438 0.048494 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75365e-07 ( -3.89035e-08 3.9493e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53352 ( -0.226337 0.219131 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.11690E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.470200e-01
Photon flux (15-150 keV) in 9.348 sec: 0.392391 ( -0.048446 0.048377 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75022e-07 ( -4.03806e-08 3.92186e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97190 ( -4.9719 -4.9719 )
beta : -1.58003 ( -0.254135 0.238444 )
Epeak [keV] : 21.4774 ( -21.4774 7.3369 )
Norm@50keV : 837.881 ( -101.843 1.82197e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.34 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.314260e-01
Photon flux (15-150 keV) in 9.348 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) = 6.91e-08
S(50-100 keV) = 9.53e-08
T90 vs. Hardness ratio plot
T90 = 8.73199993371964 sec.
Hardness ratio (energy fluence ratio) = 1.37916
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.18425
Count Ratio (50-100 keV) / (15-25 keV) = 0.826361
Mask shadow pattern
IMX = 1.710043101406890E-01, IMY = -3.144712058619749E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.776000 -0.036000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6283 22.0218 0.2 16.4 -40.1 9.9195 50.9 0.5 Crab
83.1061 -29.1693 3.0 39.8 -167.8 1.1021 3.9 ------ UNKNOWN
83.3661 58.2979 3.5 49.9 -10.5 1.3281 3.3 ------ UNKNOWN
55.3358 27.5867 3.6 41.0 -61.1 1.9809 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.036000 9.312000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7129 21.8682 4.2 16.2 -40.3 0.0792 2.8 9.8 Crab
112.7662 17.0234 0.8 19.7 61.5 0.4840 13.9 ------ UNKNOWN
96.3594 -34.1500 2.5 43.3 174.4 0.2424 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
75.124610 962.291800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6329 22.0212 0.2 27.9 -81.2 36.8827 49.2 0.4 Crab
147.4921 38.4268 3.5 37.1 41.5 3.1207 3.3 ------ UNKNOWN
129.7179 61.5494 2.7 46.1 4.9 4.2964 4.2 ------ UNKNOWN
110.7459 -10.8022 2.9 27.9 178.0 2.4764 3.9 ------ UNKNOWN
114.1220 52.0780 2.9 35.1 -4.8 2.5420 3.9 ------ UNKNOWN
97.5733 -3.2984 3.0 25.2 -148.4 2.0208 3.8 ------ UNKNOWN
Plot creation:
Mon Mar 28 14:47:30 EDT 2016