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
286.7457 6.7574 0.0083 41.8603 60.1205 13.2926606 23.198 TRIG_00456073
Foreground time interval of the image:
-6.384 12.181 (delta_t = 18.565 [sec])
Background time interval of the image:
-239.520 -6.384 (delta_t = 233.136 [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 -6.188 sec. to 140.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43236 ( -0.0437598 0.0437445 )
Norm@50keV : 1.99948E-02 ( -0.000473491 0.000473325 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.48 using 59 PHA bins.
# Reduced chi-squared = 0.8330 for 57 degrees of freedom
# Null hypothesis probability = 8.114154e-01
Photon flux (15-150 keV) in 146.5 sec: 2.45348 ( -0.0656492 0.0658605 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81236e-05 ( -6.8472e-07 6.85106e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.188 sec. to 140.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26851 ( -0.178912 0.0819678 )
Epeak [keV] : 260.481 ( -105.284 -260.486 )
Norm@50keV : 2.35610E-02 ( -0.00315348 0.00449237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.86 using 59 PHA bins.
# Reduced chi-squared = 0.8011 for 56 degrees of freedom
# Null hypothesis probability = 8.570990e-01
Photon flux (15-150 keV) in 146.5 sec: 2.42389 ( -0.07176 0.07214 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79248e-05 ( -7.25175e-07 7.21805e-07 ) ergs/cm2
Band function
Time interval is from -6.188 sec. to 140.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03359 ( -0.399145 3.28202 )
beta : -1.50163 ( 1.50063 0.0799729 )
Epeak [keV] : 108.124 ( -61.4134 759.799 )
Norm@50keV : 3.22129E-02 ( -0.0113478 2.36222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.35 using 59 PHA bins.
# Reduced chi-squared = 0.8063 for 55 degrees of freedom
# Null hypothesis probability = 8.473501e-01
Photon flux (15-150 keV) in 146.5 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] : 18.3305 ( )
R^2/D10^2 : 0.138196 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 414.22 using 59 PHA bins.
# Reduced chi-squared = 7.2669 for 57 degrees of freedom
# Null hypothesis probability = 1.128342e-55
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.354e-06 6.549e-08
25- 50 6.347e-06 2.300e-07
50-150 1.555e-05 6.226e-07
15-150 2.325e-05 6.153e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-4.13226 -200)
Norm : 10.2708 (-0.243048 0.243048)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.70 using 59 PHA bins.
# Reduced chi-squared = 1.504 for 57 degrees of freedom
# Null hypothesis probability = 8.282593e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.748e-06 9.816e-08
25- 50 7.210e-06 1.970e-07
50-150 1.581e-05 4.322e-07
15-150 2.677e-05 7.178e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.25023 (-0.795627 0.841235)
R1^2/D10^2 : 1.34261 (-0.358714 0.543725)
kT2 [keV] : 31.3216 (-2.82831 3.73352)
R2^2/D10^2 : 1.77238E-02 (-0.00574939 0.0071883)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.63 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Null hypothesis probability = 3.782185e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.863e-06 2.256e-07
25- 50 7.001e-06 3.384e-07
50-150 1.789e-05 9.596e-07
15-150 2.776e-05 1.502e-06
Peak spectrum fit
Power-law model
Time interval is from 13.740 sec. to 14.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20922 ( -0.0766503 0.0767445 )
Norm@50keV : 0.421255 ( -0.0199733 0.0199733 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.33 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.907679e-01
Photon flux (15-150 keV) in 1 sec: 49.5118 ( -2.41458 2.41633 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.26276e-06 ( -2.20747e-07 2.21127e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.740 sec. to 14.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.540157 ( -0.354567 0.32962 )
Epeak [keV] : 124.207 ( -24.7781 63.9589 )
Norm@50keV : 0.850392 ( -0.243235 0.368535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.52 using 59 PHA bins.
# Reduced chi-squared = 0.8307 for 56 degrees of freedom
# Null hypothesis probability = 8.127402e-01
Photon flux (15-150 keV) in 1 sec: 48.6058 ( -2.4498 2.4532 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1944e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 13.740 sec. to 14.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.546603 ( -0.322354 0.258019 )
beta : -9.37163 ( 9.37167 19.3717 )
Epeak [keV] : 125.055 ( -15.3575 62.3139 )
Norm@50keV : 0.843900 ( -0.202772 0.154467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.52 using 59 PHA bins.
# Reduced chi-squared = 0.8458 for 55 degrees of freedom
# Null hypothesis probability = 7.851368e-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] : 19.3897 (-1.09586 1.16958)
R^2/D10^2 : 2.64756 (-0.466127 0.558893)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.76 using 59 PHA bins.
# Reduced chi-squared = 1.8379 for 57 degrees of freedom
# Null hypothesis probability = 1.193453e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.942e-07 1.735e-08
25- 50 9.473e-07 6.330e-08
50-150 2.627e-06 2.030e-07
15-150 3.769e-06 2.115e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-6.91628 -200)
Norm : 204.875 (-9.91828 9.91828)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.05 using 59 PHA bins.
# Reduced chi-squared = 1.8957 for 57 degrees of freedom
# Null hypothesis probability = 5.234972e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.101e-07 2.705e-08
25- 50 9.812e-07 5.400e-08
50-150 2.152e-06 1.210e-07
15-150 3.643e-06 2.075e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.85284 (-1.83682 2.33255)
R1^2/D10^2 : 23.4321 (-12.0002 31.7977)
kT2 [keV] : 27.3510 (-3.45265 6.05016)
R2^2/D10^2 : 0.701290 (-0.371328 0.463777)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.69 using 59 PHA bins.
# Reduced chi-squared = 0.8670 for 55 degrees of freedom
# Null hypothesis probability = 7.475023e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.443e-07 9.700e-08
25- 50 9.503e-07 1.398e-07
50-150 2.907e-06 5.085e-07
15-150 4.201e-06 6.950e-07
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: 1.31317 ( -0.0710163 0.0709116 )
Norm@50keV : 5.53507E-02 ( -0.00214383 0.00214289 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9574 for 57 degrees of freedom
# Null hypothesis probability = 5.666809e-01
Photon flux (15-150 keV) in 18.37 sec: 6.61977 ( -0.277481 0.278579 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00159e-05 ( -4.10645e-07 4.11488e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30913 ( -0.248948 0.176993 )
Epeak [keV] : 9997.89 ( -9997.79 -9997.79 )
Norm@50keV : 5.55797E-02 ( -0.00214933 0.018898 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9744 for 56 degrees of freedom
# Null hypothesis probability = 5.292651e-01
Photon flux (15-150 keV) in 18.37 sec: 6.60229 ( -0.29031 0.29504 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.99712e-06 ( -4.15033e-07 4.35902e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05564 ( 1.05564 1.05564 )
beta : -1.31317 ( -0.0709211 0.0710349 )
Epeak [keV] : 40.0427 ( -40.0427 -40.0427 )
Norm@50keV : 0.105957 ( -0.0404858 4122.35 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 55 degrees of freedom
# Null hypothesis probability = 4.908991e-01
Photon flux (15-150 keV) in 18.37 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) = 6.72e-06
S(50-100 keV) = 9.96e-06
T90 vs. Hardness ratio plot
T90 = 42.4999999403954 sec.
Hardness ratio (energy fluence ratio) = 1.48214
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.49219
Count Ratio (50-100 keV) / (15-25 keV) = 1.30511
Mask shadow pattern (with DETECTION mask)
IMX = 4.463664410743676E-01, IMY = -7.768972282570237E-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:
-239.520000 -6.188000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9805 -15.6395 0.2 7.3 -72.6 11.7962 52.0 0.1 Sco X-1
254.4540 35.1928 4.8 52.8 5.0 1.9724 2.4 9.0 Her X-1
256.0279 -37.8845 3.1 20.5 174.3 0.8953 3.8 3.1 4U 1700-377
256.3941 -36.4333 2.8 19.2 172.6 0.9335 4.0 2.1 GX 349+2
263.0389 -24.7565 0.8 12.3 130.1 3.1821 13.7 1.8 GX 1+4
264.7964 -44.4464 6.9 28.8 164.0 0.4875 1.7 2.3 4U 1735-44
268.2819 -1.6012 3.8 22.4 49.0 0.9035 3.1 10.3 SW J1753.5-0127
270.2765 -25.0672 2.7 18.3 119.9 1.0442 4.2 0.8 GX 5-1
270.1577 -25.8766 104.4 18.5 122.4 0.0279 0.1 11.2 GRS 1758-258
274.0121 -13.9476 8.1 21.2 85.9 0.4544 1.4 5.3 GX 17+2
275.8047 -30.3438 4.7 24.9 127.9 0.7921 2.5 6.4 H1820-303
285.0184 -24.9310 470.2 31.3 112.0 0.0112 0.0 1.1 HT1900.1-2455
262.9865 -33.8807 41.1 18.9 154.3 -0.0707 -0.3 2.8 GX 354-0
239.4090 24.8920 2.8 44.3 -14.1 1.7415 4.2 ------ UNKNOWN
233.0255 38.6342 3.0 59.1 -14.7 6.3375 3.9 ------ UNKNOWN
223.7233 -38.1876 3.1 32.3 -132.6 1.1779 3.8 ------ UNKNOWN
223.0705 32.7307 4.6 57.6 -26.4 4.1475 2.5 ------ UNKNOWN
199.6315 -56.7778 4.0 55.3 -145.3 5.1508 3.0 ------ UNKNOWN
206.8042 -29.7510 3.3 43.1 -112.3 4.7098 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.188000 12.180600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8321 -15.7131 5.7 7.4 -73.5 0.1450 2.0 9.6 Sco X-1
254.4430 35.2747 3.8 52.9 5.0 -1.1421 -3.0 4.1 Her X-1
256.1681 -37.8765 4.4 20.6 174.0 -0.2204 -2.6 8.8 4U 1700-377
256.6095 -36.3945 7.2 19.2 172.1 0.1383 1.6 8.6 GX 349+2
263.0216 -24.7234 13.0 12.3 130.0 -0.0804 -0.9 1.5 GX 1+4
264.6679 -44.3114 28.2 28.7 164.1 -0.0417 -0.4 8.9 4U 1735-44
268.4940 -1.3020 0.0 22.8 48.8 -0.0144 -0.1 11.8 SW J1753.5-0127
270.4258 -24.9296 25.7 18.4 119.3 -0.0423 -0.4 11.8 GX 5-1
270.2380 -25.9012 12.6 18.6 122.3 -0.0815 -0.9 10.1 GRS 1758-258
274.0114 -14.0283 51.4 21.2 86.2 -0.0278 -0.2 0.6 GX 17+2
275.9499 -30.3378 8.0 25.0 127.7 -0.1789 -1.4 2.2 H1820-303
285.0610 -25.0514 9.9 31.3 112.2 -0.2602 -1.2 8.0 HT1900.1-2455
263.1406 -33.6652 0.0 18.8 153.6 0.0396 0.4 12.7 GX 354-0
286.7512 6.7540 0.5 41.9 60.1 14.7449 21.2 ------ UNKNOWN
295.3049 -37.4913 2.7 42.5 129.5 1.7505 4.3 ------ UNKNOWN
251.2791 18.3781 2.9 36.0 1.1 0.4306 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
126.980600 962.560000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5166 35.2190 39.0 41.1 -152.9 -0.2403 -0.3 7.9 Her X-1
262.9541 -24.6342 3.5 39.0 104.3 6.5685 3.3 7.3 GX 1+4
268.3521 -1.3984 2.6 20.1 135.5 2.3465 4.4 3.4 SW J1753.5-0127
270.1617 -25.0278 3.7 35.6 95.0 4.6829 3.1 7.3 GX 5-1
270.2539 -25.6430 11.0 36.1 94.4 1.6917 1.1 6.6 GRS 1758-258
274.0038 -13.9818 3.2 24.3 100.1 2.7144 3.6 3.3 GX 17+2
275.7432 -30.4365 5.0 38.6 84.0 5.9570 2.3 10.3 H1820-303
285.0021 -25.0240 5.6 31.8 71.7 2.0473 2.1 6.5 HT1900.1-2455
288.7990 10.9440 0.5 4.7 -86.2 12.2535 22.5 0.1 GRS 1915+105
299.5999 35.1905 0.6 30.8 -90.6 16.7610 19.4 0.8 Cyg X-1
308.0817 41.0074 3.2 39.2 -85.7 9.2535 3.6 3.5 Cyg X-3
298.2752 -6.9729 3.3 17.9 28.4 1.6462 3.5 ------ UNKNOWN
295.3488 19.7561 2.7 15.5 -79.6 2.1164 4.3 ------ UNKNOWN
334.8487 7.8646 2.5 47.7 -25.9 4.8290 4.6 ------ UNKNOWN
342.2828 3.0334 4.5 55.4 -20.4 4.7726 2.5 ------ UNKNOWN
244.7149 42.6001 3.1 51.6 -150.4 5.7366 3.7 ------ UNKNOWN
275.5938 51.0875 3.6 45.3 -121.2 7.1125 3.2 ------ UNKNOWN
Plot creation:
Fri Dec 18 19:35:43 EST 2015