Special notes of this burst
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
349.548 32.476 0.000 42.307 -26.439 2.447 8.446 TRIG_00509717
Image time interval: 0.000 to 320.000 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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) 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 1.616 sec. to 411.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60499 ( -0.206021 0.209392 )
Norm@50keV : 7.08415E-04 ( -9.14009e-05 9.04605e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.71 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.256178e-01
Photon flux (15-150 keV) in 409.4 sec: 9.11760E-02 ( -0.0112507 0.011265 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71072e-06 ( -3.71874e-07 3.76862e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.616 sec. to 411.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15569 ( -0.852304 0.432269 )
Epeak [keV] : 87.8852 ( -39.8911 -87.8758 )
Norm@50keV : 1.23495E-03 ( -0.000594941 0.0022604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 56 degrees of freedom
# Null hypothesis probability = 2.273739e-01
Photon flux (15-150 keV) in 409.4 sec: 8.97289E-02 ( -0.0114571 0.0114851 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60848e-06 ( -4.1019e-07 4.115e-07 ) ergs/cm2
Band function
Time interval is from 1.616 sec. to 411.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15213 ( -0.577843 0.810551 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 87.5936 ( -33.7295 -87.5938 )
Norm@50keV : 1.23988E-03 ( -0.000599776 0.00225829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 2.002427e-01
Photon flux (15-150 keV) in 409.4 sec: 8.95788E-02 ( 6.91042 -0.01125 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61824e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7094 (-2.10428 2.63155)
R^2/D10^2 : 1.81217E-02 (-0.00882783 0.016817)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.96 using 59 PHA bins.
# Reduced chi-squared = 1.420 for 57 degrees of freedom
# Null hypothesis probability = 2.017554e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.542e-07 5.818e-08
25- 50 8.540e-07 1.494e-07
50-150 8.604e-07 2.348e-07
15-150 1.969e-06 3.441e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 161.295 (-67.0263 -160.156)
Norm : 0.377662 (-0.0497957 0.0599827)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.561962e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.945e-07 2.186e-07
25- 50 7.388e-07 3.855e-07
50-150 1.501e-06 8.601e-07
15-150 2.635e-06 1.449e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.95900 (-1.48385 1.01667)
R1^2/D10^2 : 0.115972 (-0.0646755 0.154324)
kT2 [keV] : 27.9422 (-7.92701 17.8423)
R2^2/D10^2 : 8.27998E-04 (-0.000645281 0.00114866)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.468653e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.103e-07 1.950e-07
25- 50 7.556e-07 3.367e-07
50-150 1.542e-06 8.440e-07
15-150 2.708e-06 1.351e-06
Peak spectrum fit
Power-law model
Time interval is from 216.348 sec. to 217.348 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38511 ( -0.805627 0.780848 )
Norm@50keV : 4.10487E-03 ( -0.00176925 0.00176695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.42 using 59 PHA bins.
# Reduced chi-squared = 0.8494 for 57 degrees of freedom
# Null hypothesis probability = 7.837407e-01
Photon flux (15-150 keV) in 1 sec: 0.498234 ( -0.223904 0.227777 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97867e-08 ( -1.80748e-08 1.8476e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 216.348 sec. to 217.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.756873 ( -0.757972 6.60004 )
Epeak [keV] : 109.247 ( -109.347 -109.347 )
Norm@50keV : 8.02976E-03 ( -0.00802124 8.13581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8617 for 56 degrees of freedom
# Null hypothesis probability = 7.595500e-01
Photon flux (15-150 keV) in 1 sec: 0.484408 ( -0.244209 0.233883 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.87712e-08 ( -1.83727e-08 1.89731e-08 ) ergs/cm2
Band function
Time interval is from 216.348 sec. to 217.348 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.750569 ( -3.73886 0.845187 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 108.339 ( -69.7784 -108.448 )
Norm@50keV : 8.10377E-03 ( -0.00809561 0.911542 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8774 for 55 degrees of freedom
# Null hypothesis probability = 7.281517e-01
Photon flux (15-150 keV) in 1 sec: 0.488924 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90568e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.9612 (-7.56327 15.4369)
R^2/D10^2 : 2.65199E-02 (-0.0265146 0.121883)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.02 using 59 PHA bins.
# Reduced chi-squared = 0.8600 for 57 degrees of freedom
# Null hypothesis probability = 7.648851e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.875e-09 1.260e-09
25- 50 9.008e-09 5.720e-09
50-150 2.379e-08 1.712e-08
15-150 3.467e-08 2.309e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.08935 (-0.901833 1.10202)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.48 using 59 PHA bins.
# Reduced chi-squared = 0.8506 for 57 degrees of freedom
# Null hypothesis probability = 7.816886e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.203e-09 3.284e-09
25- 50 1.001e-08 6.515e-09
50-150 2.195e-08 1.395e-08
15-150 3.716e-08 2.429e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.02002 (-5.00549 21.2931)
R1^2/D10^2 : 1.74516 (-1.78461 -1.78461)
kT2 [keV] : 23.8911 (-23.8881 -23.8881)
R2^2/D10^2 : 1.06299E-02 (-0.0106403 0.0689234)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.35 using 59 PHA bins.
# Reduced chi-squared = 0.8609 for 55 degrees of freedom
# Null hypothesis probability = 7.586505e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.391e-09 3.832e-09
25- 50 8.822e-09 4.557e-09
50-150 2.555e-08 1.648e-08
15-150 3.976e-08 2.218e-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: 1.60522 ( -0.220725 0.22509 )
Norm@50keV : 7.52164E-04 ( -0.000104269 0.000103216 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.43 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.202135e-01
Photon flux (15-150 keV) in 343.3 sec: 9.68137E-02 ( -0.012929 0.0129507 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41335e-06 ( -3.54773e-07 3.59548e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01816 ( -0.953228 0.724086 )
Epeak [keV] : 79.9328 ( -27.2634 -79.9306 )
Norm@50keV : 1.53318E-03 ( -0.00087981 0.00324415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.82 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 56 degrees of freedom
# Null hypothesis probability = 3.387897e-01
Photon flux (15-150 keV) in 343.3 sec: 9.47593E-02 ( -0.0130704 0.0132267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30871e-06 ( -3.82824e-07 3.87249e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01662 ( -0.694336 0.91222 )
beta : -10.0000 ( 10 8.52651e-14 )
Epeak [keV] : 79.8395 ( -27.1599 -79.8395 )
Norm@50keV : 1.53582E-03 ( -0.000848713 0.00323705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.82 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.050372e-01
Photon flux (15-150 keV) in 343.3 sec: 9.47282E-02 ( 6.90527 -0.0125703 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31674e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.04e-07
S(50-100 keV) = 9.26e-07
T90 vs. Hardness ratio plot
T90 = 373.819999992847 sec.
Hardness ratio (energy fluence ratio) = 1.31534
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.09687
Count Ratio (50-100 keV) / (15-25 keV) = 0.909631
Mask shadow pattern
IMX = 0.814948701689, IMY = 0.405239122531
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-129.599400 1.616000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
32.4519 58.3202 2.5 50.3 26.9 3.4297 4.7 ------ UNKNOWN
336.2419 22.2211 3.0 50.7 -44.7 2.8360 3.9 ------ UNKNOWN
352.2990 -14.4565 3.6 41.2 -100.0 2.3435 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
1.616000 344.900600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
53.3910 26.4740 2.0 31.0 73.8 4.2474 5.7 ------ UNKNOWN
30.7926 32.4273 2.3 24.5 31.0 2.3147 5.1 ------ UNKNOWN
15.8273 33.6318 2.1 27.4 2.7 2.2057 5.6 ------ UNKNOWN
15.8043 8.1034 2.3 11.1 -66.5 1.8584 5.0 ------ UNKNOWN
15.3421 0.0213 1.9 14.2 -101.4 2.2971 6.0 ------ UNKNOWN
5.9883 15.4689 1.9 21.8 -45.4 2.4256 6.2 ------ UNKNOWN
17.3493 -24.0253 2.4 33.6 -140.8 2.3669 4.8 ------ UNKNOWN
342.0557 9.8185 2.8 44.4 -61.1 6.4574 4.1 ------ UNKNOWN
351.2147 -11.8865 2.4 40.8 -95.8 6.7977 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
406.300600 963.080000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5799 35.1906 0.5 41.2 -50.4 18.6224 22.5 0.8 Cyg X-1
308.1072 40.9485 1.9 34.0 -42.0 2.9671 5.9 0.3 Cyg X-3
326.1063 38.2336 5.7 19.9 -45.1 0.6911 2.0 6.1 Cyg X-2
31.4296 43.7843 3.0 34.4 80.1 3.1908 3.9 ------ UNKNOWN
28.6887 37.8487 3.1 32.2 90.9 2.6339 3.8 ------ UNKNOWN
13.0254 -4.3043 2.6 43.0 166.0 3.3635 4.5 ------ UNKNOWN
349.5387 32.4866 1.5 0.0 -83.7 2.5633 7.6 ------ UNKNOWN
275.7203 60.9961 3.3 54.3 -13.4 3.6143 3.5 ------ UNKNOWN
328.5634 -11.6184 2.2 48.5 -130.4 9.1486 5.2 ------ UNKNOWN
Plot creation:
Thu Oct 8 20:23:32 EDT 2015