Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
136.008 -51.405 0.018 41.407 -145.312 1.941 10.632 TRIG_00155408
Image time interval: 0.000 to 120.000 [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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 120.000000
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 120.000000
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 120.000000
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)
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 7.384 sec. to 105.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79431 ( -0.220187 0.228971 )
Norm@50keV : 1.25148E-03 ( -0.000179721 0.000176454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.55 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.165263e-01
Photon flux (15-150 keV) in 98.23 sec: 0.172072 ( -0.0222627 0.0222917 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13197e-06 ( -1.63934e-07 1.66453e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.384 sec. to 105.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.928111 ( -1.50201 0.98817 )
Epeak [keV] : 54.6285 ( -14.2045 -54.6388 )
Norm@50keV : 3.78348E-03 ( -0.00377996 0.0224925 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 56 degrees of freedom
# Null hypothesis probability = 3.432236e-01
Photon flux (15-150 keV) in 98.23 sec: 0.166391 ( -0.023733 0.023491 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04652e-06 ( -1.91232e-07 1.97894e-07 ) ergs/cm2
Band function
Time interval is from 7.384 sec. to 105.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.354463 ( -1.30554 5.24829 )
beta : -2.34534 ( 2.34495 0.57572 )
Epeak [keV] : 45.8382 ( -18.8629 39.847 )
Norm@50keV : 8.59028E-03 ( -0.00945195 1.26566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.50 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.482048e-01
Photon flux (15-150 keV) in 98.23 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05934e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4345 (-1.46074 1.72392)
R^2/D10^2 : 5.05598E-02 (-0.0208756 0.0340708)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.59 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.035029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.366e-07 3.023e-08
25- 50 4.056e-07 7.181e-08
50-150 3.083e-07 9.543e-08
15-150 8.505e-07 1.350e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.2632 (-34.3994 77.7674)
Norm : 0.769784 (-0.129727 0.163879)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.92 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 57 degrees of freedom
# Null hypothesis probability = 3.701809e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.976e-07 3.561e-08
25- 50 3.398e-07 5.285e-08
50-150 5.419e-07 2.256e-07
15-150 1.079e-06 2.977e-07
Double BB
R1^2/D10^2 : 8.26326E-02 (-0.0393054 0.104169)
kT2 [keV] : 69.9171 (-37.9821 -56.4871)
R2^2/D10^2 : 7.27087E-05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.12 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.02 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 2.557259e-01
# Null hypothesis probability = 3.610188e-01
# Null hypothesis probability = 3.646781e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.799e-07 7.607e-08
25- 50 3.674e-07 1.302e-07
50-150 3.663e-07 1.423e-07
15-150 9.136e-07 2.775e-07
Peak spectrum fit
Power-law model
Time interval is from 43.720 sec. to 44.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47415 ( -0.567032 0.55993 )
Norm@50keV : 5.37725E-03 ( -0.00177269 0.00175438 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.26 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.286962e-01
Photon flux (15-150 keV) in 1 sec: 0.666740 ( -0.221769 0.223131 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.12345e-08 ( -1.78854e-08 1.82885e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 43.720 sec. to 44.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.851347 ( -2.18976 1.31107 )
Epeak [keV] : 87.7375 ( -88.5343 -88.5343 )
Norm@50keV : 1.15064E-02 ( -0.0113344 1.52974 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 56 degrees of freedom
# Null hypothesis probability = 3.974934e-01
Photon flux (15-150 keV) in 1 sec: 0.653785 ( -0.23515 0.22965 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87294e-08 ( -2.03238e-08 2.02897e-08 ) ergs/cm2
Band function
Time interval is from 43.720 sec. to 44.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.59032 ( -1.47142 0.617747 )
Epeak [keV] : 24.4343 ( -24.4367 60.4136 )
Norm@50keV : 672.079 ( -213.661 4.60778e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.66 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 55 degrees of freedom
# Null hypothesis probability = 3.772913e-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] : 14.3784 (-4.58213 7.16557)
R^2/D10^2 : 9.03434E-02 (-0.0902341 0.263096)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.927787e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.934e-09 2.502e-09
25- 50 1.502e-08 9.030e-09
50-150 2.072e-08 1.402e-08
15-150 3.967e-08 2.565e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.75738 (-0.888909 1.16074)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.18 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.315579e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.866e-09 4.247e-09
25- 50 1.321e-08 8.135e-09
50-150 2.897e-08 1.761e-08
15-150 4.904e-08 3.007e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.141 ( )
R1^2/D10^2 : 7.01904E-05 (-7.07142e-05 0.168002)
kT2 [keV] : 11.3377 (-8.35904 6.40014)
R2^2/D10^2 : 0.181738 (-0.143354 1.30255)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.22 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.15 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Null hypothesis probability = 3.576344e-01
# Null hypothesis probability = 3.951081e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.875e-09 3.814e-09
25- 50 1.425e-08 8.315e-09
50-150 2.704e-08 1.529e-08
15-150 4.717e-08 2.627e-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: 1.79431 ( -0.220187 0.228971 )
Norm@50keV : 1.25148E-03 ( -0.000179721 0.000176454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.55 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.165263e-01
Photon flux (15-150 keV) in 98.23 sec: 0.172072 ( -0.0222627 0.0222917 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13197e-06 ( -1.63934e-07 1.66453e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.928111 ( -1.50201 0.98817 )
Epeak [keV] : 54.6285 ( -14.2045 -54.6388 )
Norm@50keV : 3.78348E-03 ( -0.00377996 0.0224925 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 56 degrees of freedom
# Null hypothesis probability = 3.432236e-01
Photon flux (15-150 keV) in 98.23 sec: 0.166391 ( -0.023733 0.023491 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04652e-06 ( -1.91232e-07 1.97894e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.354463 ( -1.40458 5.27434 )
beta : -2.34534 ( 2.34495 0.57572 )
Epeak [keV] : 45.8382 ( -18.8629 39.847 )
Norm@50keV : 8.59028E-03 ( -0.00945195 1.26566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.50 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.482048e-01
Photon flux (15-150 keV) in 98.23 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05934e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.18e-07
S(50-100 keV) = 3.67e-07
T90 vs. Hardness ratio plot
T90 = 85.1840000152588 sec.
Hardness ratio (energy fluence ratio) = 1.15409
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37596
Count Ratio (50-100 keV) / (15-25 keV) = 0.667735
Mask shadow pattern
IMX = -0.725101197699, IMY = 0.501860005705
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 120.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 120.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 120.000000
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:
-6.299400 7.384000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5686 -40.5039 6.6 50.8 -137.6 -0.2852 -1.7 3.6 Vela X-1
170.4491 -60.7096 5.1 21.7 -130.6 0.0797 2.3 6.5 Cen X-3
186.4556 -62.7532 3.7 14.4 -121.6 0.1008 3.1 5.6 GX 301-2
244.8821 -15.6442 6.2 54.4 -3.9 0.1926 1.9 5.6 Sco X-1
255.8558 -37.8425 6.1 35.9 18.7 0.0912 1.9 6.2 4U 1700-377
256.4359 -36.4989 191.3 37.3 18.5 0.0030 0.1 4.6 GX 349+2
263.1035 -24.7388 6.3 50.4 20.0 0.2163 1.8 5.2 GX 1+4
264.5433 -44.4062 13.0 33.0 34.2 -0.0414 -0.9 8.9 4U 1735-44
270.2337 -25.7467 4.2 51.8 28.2 0.4430 2.8 3.7 GRS 1758-258
275.8730 -30.4070 6.8 49.5 36.6 0.2774 1.7 3.6 H1820-303
263.1258 -33.8899 10.3 41.9 24.8 0.0706 1.1 7.6 GX 354-0
230.7250 -70.1032 3.3 5.0 93.3 0.1139 3.5 ------ UNKNOWN
98.1856 -49.1335 2.2 55.3 -171.8 0.5673 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
7.384000 105.616000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5385 -40.5358 5.2 50.8 -137.6 2.7770 2.2 1.2 Vela X-1
170.6316 -60.6828 4.8 21.6 -130.3 -0.6512 -2.4 10.0 Cen X-3
186.3250 -62.7361 4.6 14.4 -121.6 -0.5883 -2.5 9.3 GX 301-2
244.8765 -15.6603 6.9 54.4 -3.9 -1.2802 -1.7 6.1 Sco X-1
256.0047 -37.7791 30.5 36.0 18.8 0.1376 0.4 4.0 4U 1700-377
256.3599 -36.2663 25.0 37.5 18.2 0.1740 0.5 10.1 GX 349+2
263.0396 -24.8892 12.2 50.2 20.0 -0.8336 -0.9 8.8 GX 1+4
264.5382 -44.3826 6.2 33.0 34.2 0.6765 1.8 9.7 4U 1735-44
270.2682 -25.7571 4.7 51.8 28.3 -2.8943 -2.5 2.0 GRS 1758-258
275.8498 -30.4219 6.4 49.5 36.5 -2.1551 -1.8 5.1 H1820-303
263.1318 -33.8220 24.5 42.0 24.7 -0.2191 -0.5 7.2 GX 354-0
82.7555 -51.2738 2.6 56.9 176.2 6.5271 4.4 ------ UNKNOWN
190.2724 -29.1614 2.9 42.0 -74.0 3.9208 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
193.500590 303.096300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4873 -40.5490 1.5 10.9 -136.3 0.7110 7.9 1.9 Vela X-1
170.2854 -60.5128 3.9 20.9 -5.1 0.2988 3.0 6.7 Cen X-3
186.7519 -62.8892 5.2 28.9 -1.1 0.2665 2.2 7.6 GX 301-2
78.9403 -71.6009 2.4 31.9 75.9 0.8806 4.7 ------ UNKNOWN
95.7865 -28.8519 2.3 37.4 157.3 0.7803 4.9 ------ UNKNOWN
201.3460 -32.8782 2.9 50.0 -39.3 1.5033 4.0 ------ UNKNOWN
Plot creation:
Wed Jul 15 01:04:22 EDT 2015