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
65.4392 -51.1868 0.0132 40.7900 -81.0817 16.7521506 14.540 TRIG_00595616
Foreground time interval of the image:
-57.560 281.701 (delta_t = 339.261 [sec])
Background time interval of the image:
-239.000 -57.560 (delta_t = 181.440 [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 64.000000
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 64.000000
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 64.000000
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 -49.688 sec. to 114.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47035 ( -0.0959201 0.0961198 )
Norm@50keV : 7.25621E-03 ( -0.000390158 0.000389598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.05 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.316289e-01
Photon flux (15-150 keV) in 164.1 sec: 0.898837 ( -0.0505103 0.05061 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13528e-05 ( -6.59864e-07 6.62404e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -49.688 sec. to 114.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26120 ( -0.394139 0.257335 )
Epeak [keV] : 186.048 ( -89.2219 -186.048 )
Norm@50keV : 9.15710E-03 ( -0.00218545 0.00488485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.10 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 56 degrees of freedom
# Null hypothesis probability = 1.288011e-01
Photon flux (15-150 keV) in 164.1 sec: 0.888845 ( -0.05328 0.053323 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12046e-05 ( -7.20071e-07 7.14442e-07 ) ergs/cm2
Band function
Time interval is from -49.688 sec. to 114.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.936387 ( 0.936449 0.936449 )
beta : -1.59182 ( 1.59199 0.183661 )
Epeak [keV] : 83.8096 ( -83.8644 -83.8644 )
Norm@50keV : 1.43190E-02 ( -0.00730349 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.47 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 55 degrees of freedom
# Null hypothesis probability = 1.206287e-01
Photon flux (15-150 keV) in 164.1 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] : 15.9174 ( )
R^2/D10^2 : 8.21707E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 143.86 using 59 PHA bins.
# Reduced chi-squared = 2.5239 for 57 degrees of freedom
# Null hypothesis probability = 1.865861e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.072e-07 7.869e-08
25- 50 2.963e-06 2.117e-07
50-150 5.236e-06 5.218e-07
15-150 8.906e-06 6.113e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-24.0747 -200)
Norm : 3.70252 (-0.197569 0.197569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.11 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.899761e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.513e-06 9.977e-08
25- 50 2.910e-06 1.846e-07
50-150 6.383e-06 5.809e-07
15-150 1.081e-05 8.591e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.15278 (-1.58364 1.66685)
R1^2/D10^2 : 0.553783 (-0.238504 0.558334)
kT2 [keV] : 30.9566 (-6.34849 12.4472)
R2^2/D10^2 : 6.38762E-03 (-0.00421892 0.00822998)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.82 using 59 PHA bins.
# Reduced chi-squared = 1.288 for 55 degrees of freedom
# Null hypothesis probability = 7.399900e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.261e-06 2.279e-07
25- 50 2.965e-06 4.808e-07
50-150 6.993e-06 2.063e-06
15-150 1.122e-05 2.469e-06
Peak spectrum fit
Power-law model
Time interval is from 77.948 sec. to 78.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72620 ( -0.329787 0.376896 )
Norm@50keV : 2.14661E-02 ( -0.00526091 0.0050797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.35 using 59 PHA bins.
# Reduced chi-squared = 0.9360 for 57 degrees of freedom
# Null hypothesis probability = 6.127287e-01
Photon flux (15-150 keV) in 1 sec: 2.87754 ( -0.630552 0.630841 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9837e-07 ( -4.92735e-08 4.9748e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 77.948 sec. to 78.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.703344 ( -1.87796 1.53236 )
Epeak [keV] : 67.6149 ( -25.0526 -67.6152 )
Norm@50keV : 6.87841E-02 ( -0.0687857 0.482711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.80 using 59 PHA bins.
# Reduced chi-squared = 0.9250 for 56 degrees of freedom
# Null hypothesis probability = 6.344558e-01
Photon flux (15-150 keV) in 1 sec: 2.84460 ( -0.62497 0.63415 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9893e-07 ( -5.0204e-08 5.0784e-08 ) ergs/cm2
Band function
Time interval is from 77.948 sec. to 78.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.708722 ( -1.31431 1.88457 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 67.8418 ( -24.5182 409.617 )
Norm@50keV : 6.82352E-02 ( -0.0682359 0.483884 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.80 using 59 PHA bins.
# Reduced chi-squared = 0.9418 for 55 degrees of freedom
# Null hypothesis probability = 5.976086e-01
Photon flux (15-150 keV) in 1 sec: 2.86216 ( 4.13784 -0.65088 ) 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] : 14.7668 (-3.3357 3.95788)
R^2/D10^2 : 0.368259 (-0.211733 0.520057)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 0.9681 for 57 degrees of freedom
# Null hypothesis probability = 5.435344e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.685e-08 7.031e-09
25- 50 6.600e-08 2.268e-08
50-150 9.725e-08 4.712e-08
15-150 1.801e-07 6.676e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 134.252 (-68.6203 -132.345)
Norm : 12.2159 (-2.89003 3.73202)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.28 using 59 PHA bins.
# Reduced chi-squared = 0.9171 for 57 degrees of freedom
# Null hypothesis probability = 6.525710e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.163e-08 1.846e-08
25- 50 5.766e-08 3.323e-08
50-150 1.085e-07 7.075e-08
15-150 1.978e-07 1.178e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.74057 (-1.98502 7.02222)
R1^2/D10^2 : 5142.22 (-5240.38 -5241.42)
kT2 [keV] : 16.2644 (-3.74037 9.10034)
R2^2/D10^2 : 0.248579 (-0.213655 0.25019)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.26 using 59 PHA bins.
#Fit statistic : Chi-Squared = 50.23 using 59 PHA bins.
# Reduced chi-squared = 0.9137 for 55 degrees of freedom
# Reduced chi-squared = 0.9133 for 55 degrees of freedom
# Null hypothesis probability = 6.561639e-01
# Null hypothesis probability = 6.569801e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.886e-08 1.375e-08
25- 50 5.633e-08 2.727e-08
50-150 1.095e-07 5.912e-08
15-150 1.947e-07 7.914e-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: 1.47035 ( -0.0959201 0.0961198 )
Norm@50keV : 7.25621E-03 ( -0.000390158 0.000389598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.05 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.316289e-01
Photon flux (15-150 keV) in 164.1 sec: 0.898837 ( -0.0505103 0.05061 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13528e-05 ( -6.59864e-07 6.62404e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26120 ( -0.394139 0.257335 )
Epeak [keV] : 186.048 ( -89.2219 -186.048 )
Norm@50keV : 9.15710E-03 ( -0.00218545 0.00488485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.10 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 56 degrees of freedom
# Null hypothesis probability = 1.288011e-01
Photon flux (15-150 keV) in 164.1 sec: 0.888845 ( -0.05328 0.053323 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12046e-05 ( -7.20071e-07 7.14442e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.936387 ( 0.936449 0.936449 )
beta : -1.59182 ( 1.59199 0.183661 )
Epeak [keV] : 83.8096 ( -83.8644 -83.8644 )
Norm@50keV : 1.43190E-02 ( -0.00730349 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.47 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 55 degrees of freedom
# Null hypothesis probability = 1.206287e-01
Photon flux (15-150 keV) in 164.1 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) = 2.77e-06
S(50-100 keV) = 3.99e-06
T90 vs. Hardness ratio plot
T90 = 132.976000010967 sec.
Hardness ratio (energy fluence ratio) = 1.44043
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.51664
Count Ratio (50-100 keV) / (15-25 keV) = 1.17466
Mask shadow pattern (with DETECTION mask)
IMX = 1.337672409638843E-01, IMY = 8.524394179970561E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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 -49.688000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5052 -40.5438 1.2 25.8 11.5 1.8019 9.4 1.2 Vela X-1
170.2840 -60.6621 2.3 12.4 105.8 0.8822 5.1 2.5 Cen X-3
186.5924 -62.7536 2.0 18.0 128.1 1.1241 5.9 2.0 GX 301-2
337.8324 -67.7433 3.0 46.2 -145.0 1.6882 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-49.688000 114.392000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3318 -40.4487 9.1 25.9 11.2 -0.2495 -1.3 11.0 Vela X-1
170.6783 -60.5751 6.7 12.6 106.0 0.3266 1.7 11.1 Cen X-3
186.6254 -62.8696 2.2 17.9 128.5 0.9950 5.1 6.0 GX 301-2
102.3880 -32.5870 2.8 41.8 -30.6 1.2916 4.1 ------ UNKNOWN
65.4550 -51.1784 0.5 40.8 -81.1 18.6431 21.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
386.900600 839.044100
841.000000 848.700600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6410 -62.7591 2.9 50.1 8.4 4.5756 4.0 0.8 GX 301-2
244.9750 -15.6390 0.1 14.3 151.2 35.1117 84.5 0.3 Sco X-1
255.9859 -37.8535 2.7 11.2 -64.6 1.8160 4.3 0.6 4U 1700-377
256.3268 -36.2805 6.3 10.4 -72.1 0.7817 1.8 10.0 GX 349+2
263.0233 -24.6723 3.7 15.5 -128.3 1.3613 3.1 4.5 GX 1+4
264.7240 -44.5249 10.4 20.5 -62.1 0.5306 1.1 4.6 4U 1735-44
268.4504 -1.5959 2518.2 35.1 -162.3 0.0020 0.0 9.9 SW J1753.5-0127
270.1540 -25.0292 2.0 21.5 -120.0 2.7074 5.8 7.7 GX 5-1
270.3157 -25.7501 2.7 21.4 -118.0 2.0405 4.4 0.8 GRS 1758-258
274.0598 -14.0762 3.4 29.9 -138.6 1.7683 3.4 3.9 GX 17+2
275.8679 -30.3147 5.4 25.3 -104.2 1.0794 2.1 4.3 H1820-303
285.0337 -24.9219 12.8 34.4 -111.5 0.7545 0.9 0.2 HT1900.1-2455
288.8175 10.9702 3.6 57.6 -151.3 8.9408 3.2 1.9 GRS 1915+105
262.8561 -33.6572 0.0 14.4 -93.2 0.7166 1.6 12.5 GX 354-0
231.8657 -35.7625 3.4 13.6 38.0 1.4918 3.4 ------ UNKNOWN
252.7172 -25.3095 2.6 7.1 -151.1 1.8055 4.4 ------ UNKNOWN
265.6713 -27.7749 1.7 16.9 -115.1 3.0341 6.7 ------ UNKNOWN
266.1171 -28.7252 0.6 17.1 -111.7 8.3432 18.6 ------ UNKNOWN
Plot creation:
Fri Dec 18 18:53:27 EST 2015