Special notes of this burst
Image
Pre-slew 50.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
338.929 -64.890 0.000 50.094 -26.299 0.050 6.297 TRIG_00301578
Image time interval: 0.000 to 0.064 [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 0.064000
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 0.064000
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 0.064000
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 0.012 sec. to 121.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06926 ( -0.467642 0.545964 )
Norm@50keV : 4.94545E-04 ( -0.000166583 0.00015511 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.22 using 59 PHA bins.
# Reduced chi-squared = 0.8460 for 57 degrees of freedom
# Null hypothesis probability = 7.896269e-01
Photon flux (15-150 keV) in 121.1 sec: 7.66454E-02 ( -0.0191444 0.0191643 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54897e-07 ( -1.6186e-07 1.68599e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 121.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96991 ( )
Epeak [keV] : 14.2200 ( )
Norm@50keV : 5.59778E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.22 using 59 PHA bins.
# Reduced chi-squared = 0.8611 for 56 degrees of freedom
# Null hypothesis probability = 7.606483e-01
Photon flux (15-150 keV) in 121.1 sec: 7.64714E-02 ( -0.0195504 0.0192782 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50931e-07 ( -1.69621e-07 1.7207e-07 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 121.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97044 ( -4.97044 -4.97044 )
beta : -2.16502 ( -0.74784 0.525142 )
Epeak [keV] : 20.8595 ( -20.8595 93.2332 )
Norm@50keV : 268.370 ( -66.4959 1.2242e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8740 for 55 degrees of freedom
# Null hypothesis probability = 7.345701e-01
Photon flux (15-150 keV) in 121.1 sec: 7.58189E-02 ( ) 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] : 10.0339 (-4.02719 6.02569)
R^2/D10^2 : 3.29182E-02 (-0.0318023 0.212133)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.46 using 59 PHA bins.
# Reduced chi-squared = 0.9730 for 57 degrees of freedom
# Null hypothesis probability = 5.329014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.183e-08 4.516e-08
25- 50 2.044e-07 1.093e-07
50-150 1.077e-07 7.599e-08
15-150 3.940e-07 2.374e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 66.9196 (-35.8534 -66.924)
Norm : 0.378501 (-0.14257 0.233135)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.75 using 59 PHA bins.
# Reduced chi-squared = 0.8552 for 57 degrees of freedom
# Null hypothesis probability = 7.735527e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.170e-07 4.981e-08
25- 50 1.839e-07 8.416e-08
50-150 2.283e-07 1.782e-07
15-150 5.291e-07 2.585e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.32502 (-1.658 2.61691)
R1^2/D10^2 : 0.766876 (-0.66549 1.83579)
kT2 [keV] : 19.4284 (-7.04197 15.9156)
R2^2/D10^2 : 2.21459E-03 (-0.00196407 0.00960627)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.65 using 59 PHA bins.
# Reduced chi-squared = 0.8483 for 55 degrees of freedom
# Null hypothesis probability = 7.809741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.415e-07 8.435e-08
25- 50 1.510e-07 7.908e-08
50-150 2.696e-07 1.781e-07
15-150 5.621e-07 3.073e-07
Peak spectrum fit
Power-law model
Time interval is from -0.048 sec. to 0.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12956 ( -0.442614 0.412389 )
Norm@50keV : 1.28185E-02 ( -0.00332728 0.00327267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.03 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 57 degrees of freedom
# Null hypothesis probability = 5.491572e-01
Photon flux (15-150 keV) in 1 sec: 1.49162 ( -0.401845 0.411538 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32785e-07 ( -3.34117e-08 3.35411e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 0.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26141 ( )
Epeak [keV] : 85.9259 ( )
Norm@50keV : 7.05608E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 56 degrees of freedom
# Null hypothesis probability = 5.484333e-01
Photon flux (15-150 keV) in 1 sec: 1.42899 ( -0.40308 0.42196 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29241e-07 ( -3.53885e-08 3.4679e-08 ) ergs/cm2
Band function
Time interval is from -0.048 sec. to 0.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.265280 ( -0.770879 2.44806 )
beta : 10.0000 ( -10 -10 )
Epeak [keV] : 120.670 ( -120.67 -120.67 )
Norm@50keV : 2.75561E-21 ( -8.12146e-22 2.54396e-14 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.04 using 59 PHA bins.
# Reduced chi-squared = 0.9825 for 55 degrees of freedom
# Null hypothesis probability = 5.113996e-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] : 21.6339 (-6.02398 9.0585)
R^2/D10^2 : 5.53495E-02 (-0.0375506 0.108497)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.75 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 57 degrees of freedom
# Null hypothesis probability = 5.219201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.831e-09 2.920e-09
25- 50 2.529e-08 1.384e-08
50-150 8.838e-08 4.274e-08
15-150 1.185e-07 5.889e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-79.6835 -200)
Norm : 6.50786 (-1.6538 1.6538)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.73 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.481789e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.622e-08 9.925e-09
25- 50 3.120e-08 1.838e-08
50-150 6.843e-08 4.141e-08
15-150 1.158e-07 6.840e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 34.6723 (-34.7039 -34.7039)
R1^2/D10^2 : 9.21577E-03 (-0.00914938 0.0741217)
kT2 [keV] : 10.3999 (-10.4138 -10.4138)
R2^2/D10^2 : 0.332929 (-0.332128 -0.332128)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.52 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9731 for 55 degrees of freedom
# Reduced chi-squared = 0.9716 for 55 degrees of freedom
# Null hypothesis probability = 5.314248e-01
# Null hypothesis probability = 5.344341e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.640e-09 5.305e-09
25- 50 3.007e-08 2.021e-08
50-150 9.209e-08 4.657e-08
15-150 1.308e-07 6.790e-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: 2.34921 ( -0.887387 1.42147 )
Norm@50keV : 1.61694E-03 ( -0.00161694 0.00103139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.87 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.968666e-01
Photon flux (15-150 keV) in 9.365 sec: 0.290521 ( -0.136032 0.136656 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.461e-07 ( -7.61051e-08 8.2031e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84827 ( )
Epeak [keV] : 14.0477 ( )
Norm@50keV : 3.02112E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.83 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 56 degrees of freedom
# Null hypothesis probability = 1.731857e-01
Photon flux (15-150 keV) in 9.365 sec: 0.286750 ( -0.1395 0.138949 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43863e-07 ( -7.61899e-08 8.35592e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99792 ( -0.00211384 0.198064 )
beta : -9.37166 ( 9.37167 19.3717 )
Epeak [keV] : 0.264464 ( -0.264464 -0.264464 )
Norm@50keV : 2.53373E-03 ( -0.00117528 0.00364408 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.82 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 55 degrees of freedom
# Null hypothesis probability = 1.506103e-01
Photon flux (15-150 keV) in 9.365 sec: 0.286527 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4239e-07 ( -1.42325e-07 -7.50992e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.70e-07
S(50-100 keV) = 1.62e-07
T90 vs. Hardness ratio plot
T90 = 114.911999970675 sec.
Hardness ratio (energy fluence ratio) = 0.952941
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.672232
Count Ratio (50-100 keV) / (15-25 keV) = 0.688988
Mask shadow pattern
IMX = 1.07195403911, IMY = 0.529777073925
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-70.223410 0.012000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.7597 -62.7182 3.4 43.8 45.1 1.1502 3.4 4.2 GX 301-2
244.9692 -15.6586 0.5 27.9 165.9 2.3056 23.4 1.3 Sco X-1
255.7804 -37.7549 7.1 4.5 -165.6 0.1407 1.6 11.1 4U 1700-377
256.2677 -36.3386 8.2 5.9 -163.4 0.1200 1.4 9.6 GX 349+2
263.0246 -24.8768 89.8 18.5 -149.6 -0.0117 -0.1 7.9 GX 1+4
264.6747 -44.5140 17.1 7.4 -61.2 -0.0596 -0.7 4.8 4U 1735-44
268.4314 -1.4178 3.9 42.5 -152.9 0.4398 2.9 4.3 SW J1753.5-0127
270.2172 -24.9452 3.7 21.3 -132.2 0.3019 3.2 8.8 GX 5-1
270.4628 -25.7154 7.2 20.8 -130.5 0.1552 1.6 8.8 GRS 1758-258
274.0112 -14.0640 2.2 32.5 -137.1 0.5828 5.2 1.7 GX 17+2
276.1191 -30.3887 8.3 20.6 -111.0 0.1331 1.4 10.1 H1820-303
285.1312 -24.8261 5.4 30.2 -108.4 -0.2955 -2.1 7.7 HT1900.1-2455
263.1169 -33.8138 3.1 10.5 -133.2 0.3188 3.7 6.5 GX 354-0
244.2452 -58.9966 2.9 18.1 25.2 0.3349 4.0 ------ UNKNOWN
256.0880 -20.5814 2.3 21.6 -170.3 0.4306 5.1 ------ UNKNOWN
323.0197 -46.6195 3.1 47.2 -53.1 1.5601 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.012000 9.376590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.7543 -62.7331 16.8 43.8 45.1 -0.0793 -0.7 3.5 GX 301-2
244.8608 -15.7447 5.2 27.8 165.7 -0.0804 -2.2 9.3 Sco X-1
256.0639 -37.9568 3.0 4.3 -162.3 0.1161 3.9 7.7 4U 1700-377
256.6114 -36.3587 14.7 5.9 -160.8 0.0239 0.8 9.3 GX 349+2
263.1008 -24.8358 5.1 18.6 -149.4 -0.0683 -2.3 7.4 GX 1+4
264.6428 -44.4548 4.6 7.3 -61.6 0.0723 2.5 4.3 4U 1735-44
268.4834 -1.4191 27.0 42.5 -152.8 0.0224 0.4 7.2 SW J1753.5-0127
270.3733 -25.1636 9.7 21.2 -131.5 0.0424 1.2 7.0 GX 5-1
270.4231 -25.8651 4.6 20.6 -130.3 -0.0897 -2.5 9.8 GRS 1758-258
274.0771 -14.0926 9.0 32.5 -136.9 -0.0564 -1.3 5.3 GX 17+2
276.1271 -30.4152 74.1 20.6 -111.0 -0.0055 -0.2 10.9 H1820-303
285.1818 -24.9031 6.5 30.2 -108.2 0.0851 1.8 8.0 HT1900.1-2455
262.9579 -33.7465 7.5 10.5 -134.0 -0.0473 -1.5 5.5 GX 354-0
275.0188 -30.5705 2.0 19.7 -112.5 0.2069 5.8 ------ UNKNOWN
322.7604 -56.8572 2.2 44.3 -39.4 0.3500 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
90.176600 962.099200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.5492 -62.6268 0.0 50.9 149.3 5.3569 2.3 9.1 GX 301-2
256.0792 -37.7788 5.3 53.4 -149.0 3.5844 2.2 5.9 4U 1700-377
256.5087 -36.5235 11.8 54.3 -147.8 2.1295 1.0 7.0 GX 349+2
264.7302 -44.4586 202.1 44.2 -146.7 0.0517 0.1 0.8 4U 1735-44
237.3231 -58.9547 3.5 43.0 -178.9 2.2373 3.3 ------ UNKNOWN
11.6166 -24.4720 3.1 45.5 -3.1 3.3338 3.8 ------ UNKNOWN
243.5149 -37.4772 4.6 58.7 -159.1 8.2710 2.5 ------ UNKNOWN
341.8193 -14.8863 3.9 50.0 -43.0 7.3667 3.0 ------ UNKNOWN
305.7897 -29.4933 4.7 40.9 -93.2 6.4318 2.5 ------ UNKNOWN
Plot creation:
Wed Nov 25 15:57:26 EST 2015