Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
42.9725 49.2805 0.0092 48.4511 38.5090 8.5972114 20.949 TRIG_00445414
Foreground time interval of the image:
-31.192 13.109 (delta_t = 44.301 [sec])
Background time interval of the image:
-145.491 -31.192 (delta_t = 114.299 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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)
The mask-weighted light curves based on cleaned DPHs
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -31.192 sec. to 32.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83120 ( -0.1139 0.116178 )
Norm@50keV : 1.01317E-02 ( -0.000667229 0.000661633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.740528e-01
Photon flux (15-150 keV) in 64 sec: 1.41338 ( -0.0914608 0.0918385 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96417e-06 ( -3.95766e-07 3.9816e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.192 sec. to 32.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06240 ( -0.128373 0.443824 )
Epeak [keV] : 27.7461 ( -9999.35 -9999.36 )
Norm@50keV : 7.66067E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.59 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 56 degrees of freedom
# Null hypothesis probability = 3.465737e-01
Photon flux (15-150 keV) in 64 sec: 1.41448 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96202e-06 ( -3.99974e-07 3.94874e-07 ) ergs/cm2
Band function
Time interval is from -31.192 sec. to 32.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62439 ( 1.62439 1.62439 )
beta : -1.83120 ( -0.116349 0.113817 )
Epeak [keV] : 19.0479 ( -19.0397 -19.0397 )
Norm@50keV : 1.72098E-02 ( -0.00637565 1.44976 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.053824e-01
Photon flux (15-150 keV) in 64 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] : 12.2913 ( )
R^2/D10^2 : 0.295889 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 142.42 using 59 PHA bins.
# Reduced chi-squared = 2.4987 for 57 degrees of freedom
# Null hypothesis probability = 2.922459e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.061e-07 7.126e-08
25- 50 1.961e-06 1.402e-07
50-150 1.810e-06 2.413e-07
15-150 4.377e-06 3.414e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 112.171 (-26.0584 32.8415)
Norm : 5.92039 (-0.495996 0.654525)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.16 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.142015e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.891e-07 1.034e-07
25- 50 1.748e-06 1.254e-07
50-150 3.015e-06 8.864e-07
15-150 5.753e-06 9.824e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.27980 (-1.21556 1.24434)
R1^2/D10^2 : 1.61294 (-0.674497 1.48656)
kT2 [keV] : 30.2697 (-7.17119 14.4831)
R2^2/D10^2 : 7.97747E-03 (-0.00559524 0.0133385)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.72 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Null hypothesis probability = 1.735454e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.864e-07 2.064e-07
25- 50 1.799e-06 2.822e-07
50-150 3.163e-06 1.085e-06
15-150 5.949e-06 1.519e-06
Peak spectrum fit
Power-law model
Time interval is from 8.308 sec. to 9.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82425 ( -0.611469 0.964868 )
Norm@50keV : 6.41579E-03 ( -0.00392741 0.00373941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.10 using 59 PHA bins.
# Reduced chi-squared = 0.8438 for 57 degrees of freedom
# Null hypothesis probability = 7.933796e-01
Photon flux (15-150 keV) in 1 sec: 1.55744 ( -0.621437 0.622355 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.15164e-08 ( -3.06405e-08 3.12943e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.308 sec. to 9.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.839853 ( -4.47633 1.16793 )
Epeak [keV] : 26.6214 ( )
Norm@50keV : 8.46814E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.69 using 59 PHA bins.
# Reduced chi-squared = 0.8337 for 56 degrees of freedom
# Null hypothesis probability = 8.079234e-01
Photon flux (15-150 keV) in 1 sec: 1.56370 ( -0.633079 0.62647 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.56276e-08 ( -3.0852e-08 3.15774e-08 ) ergs/cm2
Band function
Time interval is from 8.308 sec. to 9.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.833414 ( -0.937019 1.05351 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 26.5414 ( -16.844 22.2008 )
Norm@50keV : 8.61027E-02 ( -0.0857627 10.9084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.69 using 59 PHA bins.
# Reduced chi-squared = 0.8488 for 55 degrees of freedom
# Null hypothesis probability = 7.799636e-01
Photon flux (15-150 keV) in 1 sec: 1.57001 ( 5.42999 -0.633153 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.55632e-08 ( -7.55562e-08 -3.08644e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1861 (-5.08041 3.31224)
R^2/D10^2 : 0.697146 (-0.696933 10.8068)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.78 using 59 PHA bins.
# Reduced chi-squared = 0.8382 for 57 degrees of freedom
# Null hypothesis probability = 8.028759e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.482e-08 9.815e-09
25- 50 3.781e-08 2.449e-08
50-150 2.081e-08 1.808e-08
15-150 7.344e-08 4.677e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.2511 (-16.9586 27.7682)
Norm : 12.7054 (-6.51334 17.3194)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8207 for 57 degrees of freedom
# Null hypothesis probability = 8.309879e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.639e-08 1.601e-08
25- 50 3.083e-08 2.011e-08
50-150 1.780e-08 1.551e-08
15-150 7.502e-08 4.854e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.14007 (-3.12317 12.3244)
R1^2/D10^2 : 69.4860 (-70.8275 -70.8275)
kT2 [keV] : 11.7145 (-4.1376 61.6906)
R2^2/D10^2 : 0.323653 (-0.327347 1.67925)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.39 using 59 PHA bins.
# Reduced chi-squared = 0.8252 for 55 degrees of freedom
# Null hypothesis probability = 8.189585e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.652e-08 1.258e-08
25- 50 3.158e-08 2.056e-08
50-150 2.327e-08 1.756e-08
15-150 8.138e-08 4.841e-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: 1.77650 ( -0.111795 0.113691 )
Norm@50keV : 1.33172E-02 ( -0.000850118 0.000844629 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 57 degrees of freedom
# Null hypothesis probability = 2.969536e-01
Photon flux (15-150 keV) in 44.3 sec: 1.81863 ( -0.116887 0.117387 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43627e-06 ( -3.5494e-07 3.56822e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04416 ( -0.335668 0.112093 )
Epeak [keV] : 19.3344 ( -9999.35 -9999.36 )
Norm@50keV : 9.56328E-03 ( -0.000764952 0.00136208 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 56 degrees of freedom
# Null hypothesis probability = 2.760923e-01
Photon flux (15-150 keV) in 44.3 sec: 1.81819 ( -0.11715 0.0579 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4341e-06 ( -3.39028e-07 3.5378e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53765 ( 1.53766 1.53766 )
beta : -1.77650 ( -0.113778 0.111761 )
Epeak [keV] : 21.8767 ( -21.8749 -21.8749 )
Norm@50keV : 2.41215E-02 ( -0.0116079 1478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.358253e-01
Photon flux (15-150 keV) in 44.3 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) = 1.70e-06
S(50-100 keV) = 1.91e-06
T90 vs. Hardness ratio plot
T90 = 48 sec.
Hardness ratio (energy fluence ratio) = 1.12353
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.22211
Count Ratio (50-100 keV) / (15-25 keV) = 0.764685
Mask shadow pattern (with DETECTION mask)
IMX = 8.829483902278739E-01, IMY = -7.025551529741617E-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:
-145.491400 -31.192000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.3395 38.2884 5.6 51.8 -33.9 0.7584 2.0 8.2 Cyg X-2
53.0041 16.1988 2.2 39.9 86.8 2.1198 5.4 ------ UNKNOWN
5.6208 -23.0657 2.7 31.7 -154.3 0.5088 4.3 ------ UNKNOWN
329.0934 14.7738 2.7 43.6 -64.1 1.9936 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-31.192000 13.108600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
325.9951 38.3750 0.0 52.1 -33.9 0.3860 1.5 8.9 Cyg X-2
42.9771 49.2782 0.6 48.5 38.5 9.3357 18.6 ------ UNKNOWN
41.7950 -0.2338 2.4 29.8 117.1 0.6163 4.9 ------ UNKNOWN
325.2635 27.1296 2.4 49.1 -48.0 1.5890 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
80.508640 962.830400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6508 22.0192 0.5 42.0 134.6 35.7860 24.2 1.0 Crab
154.7152 73.5281 2.9 48.8 39.6 8.8294 4.0 ------ UNKNOWN
73.2223 9.7775 2.5 46.9 156.2 6.7668 4.6 ------ UNKNOWN
343.7541 74.5679 2.7 35.0 -4.4 2.6867 4.3 ------ UNKNOWN
30.5394 48.2188 2.9 8.2 -73.7 1.6371 4.0 ------ UNKNOWN
Plot creation:
Fri Dec 18 19:44:30 EST 2015