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
161.9753 -24.7690 0.0139 34.8490 110.1820 1.8311919 13.845 TRIG_00672525
Foreground time interval of the image:
6.088 25.784 (delta_t = 19.696 [sec])
Background time interval of the image:
-239.400 6.088 (delta_t = 245.488 [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 16.384000
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 16.384000
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 16.384000
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 6.088 sec. to 25.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94144 ( -0.206835 0.217695 )
Norm@50keV : 5.47648E-03 ( -0.00076123 0.000741711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.83 using 59 PHA bins.
# Reduced chi-squared = 0.8918 for 57 degrees of freedom
# Null hypothesis probability = 7.043842e-01
Photon flux (15-150 keV) in 19.7 sec: 0.800179 ( -0.091528 0.09158 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92764e-07 ( -1.31777e-07 1.33957e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.088 sec. to 25.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77633 ( -0.943466 0.518069 )
Epeak [keV] : 58.4746 ( )
Norm@50keV : 6.80099E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.9055 for 56 degrees of freedom
# Null hypothesis probability = 6.747746e-01
Photon flux (15-150 keV) in 19.7 sec: 0.795516 ( -0.094445 0.094027 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.76667e-07 ( -1.53029e-07 1.38131e-07 ) ergs/cm2
Band function
Time interval is from 6.088 sec. to 25.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07785 ( 1.21392 1.21392 )
beta : -2.11877 ( 2.12631 0.360758 )
Epeak [keV] : 36.3619 ( -37.0787 -37.0787 )
Norm@50keV : 1.95387E-02 ( -0.0201613 1.60868e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.05 using 59 PHA bins.
# Reduced chi-squared = 0.9099 for 55 degrees of freedom
# Null hypothesis probability = 6.638872e-01
Photon flux (15-150 keV) in 19.7 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] : 9.79988 (-1.25044 1.49088)
R^2/D10^2 : 0.402055 (-0.169578 0.279266)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.29 using 59 PHA bins.
# Reduced chi-squared = 1.198 for 57 degrees of freedom
# Null hypothesis probability = 1.453512e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.538e-07 3.502e-08
25- 50 3.715e-07 5.418e-08
50-150 1.828e-07 5.591e-08
15-150 7.082e-07 1.090e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.2695 (-23.5326 43.4139)
Norm : 3.82418 (-0.648828 0.815475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.44 using 59 PHA bins.
# Reduced chi-squared = 0.9024 for 57 degrees of freedom
# Null hypothesis probability = 6.828927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.946e-07 3.339e-08
25- 50 3.156e-07 4.452e-08
50-150 4.272e-07 1.555e-07
15-150 9.374e-07 1.695e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12963 (-1.59495 1.59207)
R1^2/D10^2 : 1.10441 (-0.560804 1.56181)
kT2 [keV] : 30.5066 (-11.9231 60.2163)
R2^2/D10^2 : 3.81590E-03 (-0.00357847 0.0198768)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.49 using 59 PHA bins.
# Reduced chi-squared = 0.8998 for 55 degrees of freedom
# Null hypothesis probability = 6.842903e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.918e-07 6.856e-08
25- 50 3.241e-07 1.160e-07
50-150 4.848e-07 2.686e-07
15-150 1.001e-06 4.119e-07
Peak spectrum fit
Power-law model
Time interval is from 11.980 sec. to 12.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00301 ( -0.5601 0.704835 )
Norm@50keV : 8.59621E-03 ( -0.00384608 0.00352646 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9424 for 57 degrees of freedom
# Null hypothesis probability = 5.991156e-01
Photon flux (15-150 keV) in 1 sec: 1.29131 ( -0.40567 0.40572 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.92994e-08 ( -3.09813e-08 3.28198e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.980 sec. to 12.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02123 ( -3.59117 0.144169 )
Epeak [keV] : 48.0827 ( )
Norm@50keV : 8.38375E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9592 for 56 degrees of freedom
# Null hypothesis probability = 5.618816e-01
Photon flux (15-150 keV) in 1 sec: 1.29170 ( -0.40542 0.40577 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 11.980 sec. to 12.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27164 ( 1.26629 1.26629 )
beta : -2.07493 ( 2.08464 0.635873 )
Epeak [keV] : 27.4877 ( -25.7221 -25.7221 )
Norm@50keV : 2.85250E-02 ( -0.0221232 3380.22 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.67 using 59 PHA bins.
# Reduced chi-squared = 0.9758 for 55 degrees of freedom
# Null hypothesis probability = 5.255936e-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] : 9.07774 (-3.34392 4.67854)
R^2/D10^2 : 0.887993 (-0.882357 4.18064)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.48 using 59 PHA bins.
# Reduced chi-squared = 0.9909 for 57 degrees of freedom
# Null hypothesis probability = 4.945574e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.431e-08 8.800e-09
25- 50 3.082e-08 1.952e-08
50-150 1.207e-08 9.360e-09
15-150 5.721e-08 3.700e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.3095 (-39.4408 -64.3089)
Norm : 6.62695 (-2.64166 5.28071)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9458 for 57 degrees of freedom
# Null hypothesis probability = 5.917547e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.683e-08 1.058e-08
25- 50 2.615e-08 1.670e-08
50-150 3.147e-08 2.545e-08
15-150 7.445e-08 5.075e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.26550 (-5.31513 -5.31513)
R1^2/D10^2 : 5.14129 (-4.97734 -4.97734)
kT2 [keV] : 18.8269 (-19.5517 -19.5517)
R2^2/D10^2 : 3.59895E-02 (-0.0316764 1.1589)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9790 for 55 degrees of freedom
# Null hypothesis probability = 5.188665e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.783e-08 1.148e-08
25- 50 2.336e-08 1.308e-08
50-150 3.185e-08 2.129e-08
15-150 7.303e-08 3.898e-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: 1.94144 ( -0.206835 0.217695 )
Norm@50keV : 5.47648E-03 ( -0.00076123 0.000741711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.83 using 59 PHA bins.
# Reduced chi-squared = 0.8918 for 57 degrees of freedom
# Null hypothesis probability = 7.043842e-01
Photon flux (15-150 keV) in 19.7 sec: 0.800126 ( -0.0915196 0.0915705 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.9259e-07 ( -1.31761e-07 1.33953e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77627 ( -0.943448 0.518108 )
Epeak [keV] : 58.4679 ( )
Norm@50keV : 6.80152E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.9055 for 56 degrees of freedom
# Null hypothesis probability = 6.747746e-01
Photon flux (15-150 keV) in 19.7 sec: 0.795331 ( -0.094406 0.094102 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.76919e-07 ( -1.52986e-07 1.46298e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07785 ( 1.21392 1.21392 )
beta : -2.11877 ( 2.12631 0.360758 )
Epeak [keV] : 36.3619 ( -37.0787 -37.0787 )
Norm@50keV : 1.95387E-02 ( -0.0201613 1.60868e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.05 using 59 PHA bins.
# Reduced chi-squared = 0.9099 for 55 degrees of freedom
# Null hypothesis probability = 6.638872e-01
Photon flux (15-150 keV) in 19.7 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) = 2.94e-07
S(50-100 keV) = 3.05e-07
T90 vs. Hardness ratio plot
T90 = 17.4400000572205 sec.
Hardness ratio (energy fluence ratio) = 1.03741
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08117
Count Ratio (50-100 keV) / (15-25 keV) = 0.552275
Mask shadow pattern
IMX = -2.402208657539906E-01, IMY = -6.535364046436554E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
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:
-239.400000 6.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4334 -40.5658 3.2 24.8 57.3 -1.0316 -3.6 4.4 Vela X-1
170.6612 -60.6988 471.8 4.9 -144.4 0.0054 0.0 11.1 Cen X-3
186.6609 -62.7544 0.9 12.7 -136.0 2.7673 12.3 1.0 GX 301-2
93.3417 -36.2340 3.0 48.3 16.0 2.2372 3.9 ------ UNKNOWN
86.3873 -34.9938 2.8 52.8 11.2 3.4675 4.1 ------ UNKNOWN
168.9269 -44.3687 2.8 16.0 129.6 0.8693 4.1 ------ UNKNOWN
118.3065 -57.4191 2.9 22.0 5.6 0.9146 4.0 ------ UNKNOWN
87.1599 -69.8633 2.4 30.9 -31.2 1.2867 4.8 ------ UNKNOWN
246.0708 -73.3305 3.1 33.0 -103.0 1.3851 3.7 ------ UNKNOWN
268.4238 -79.1501 2.7 35.0 -89.6 2.1267 4.3 ------ UNKNOWN
279.3044 -75.0653 3.5 39.5 -92.2 3.2609 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
6.088000 25.784000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5865 -40.6999 5.6 24.7 57.4 0.1543 2.1 9.1 Vela X-1
169.9073 -60.5561 0.0 4.5 -145.5 -0.0969 -2.0 12.7 Cen X-3
186.4227 -62.8734 6.9 12.6 -135.4 0.0924 1.7 8.9 GX 301-2
180.5751 -15.9584 2.6 45.9 135.3 1.1452 4.4 ------ UNKNOWN
161.9753 -24.7690 0.8 34.8 110.2 1.8313 13.9 ------ UNKNOWN
88.3783 -64.4050 2.8 32.5 -21.3 0.2663 4.1 ------ UNKNOWN
56.4175 -50.4224 2.1 54.3 -21.9 0.8741 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
121.100580 458.900590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6792 -40.5962 4.0 27.0 -8.2 0.8404 2.9 7.3 Vela X-1
170.5451 -60.7187 4.0 36.4 -63.0 -1.3827 -2.8 8.9 Cen X-3
186.7922 -62.7372 3.7 41.4 -72.9 3.2949 3.1 4.2 GX 301-2
127.3140 -0.2124 2.5 41.5 65.0 5.4631 4.6 ------ UNKNOWN
150.4350 7.8930 3.5 34.6 103.6 2.1250 3.3 ------ UNKNOWN
114.5666 -15.8757 3.4 45.1 36.0 2.9036 3.4 ------ UNKNOWN
163.9925 7.6891 2.6 32.5 127.8 2.2370 4.5 ------ UNKNOWN
163.5557 -8.8231 3.3 16.0 129.8 0.9618 3.5 ------ UNKNOWN
209.0496 -12.6397 3.1 46.0 -152.3 2.2042 3.7 ------ UNKNOWN
218.3263 -2.2560 3.1 58.7 -159.2 7.2379 3.7 ------ UNKNOWN
215.0008 -16.3635 3.1 50.1 -144.9 3.1964 3.8 ------ UNKNOWN
97.9869 -65.3254 3.1 56.8 -29.3 6.1539 3.7 ------ UNKNOWN
211.0870 -38.9731 2.4 43.5 -114.6 6.0450 4.9 ------ UNKNOWN
Plot creation:
Fri Mar 18 11:42:30 EDT 2016