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
107.5448 -22.4682 0.0152 28.1396 -176.2403 1.0160731 12.730 TRIG_00643833
Foreground time interval of the image:
-2.860 36.480 (delta_t = 39.340 [sec])
Background time interval of the image:
-525.667 -509.378 (delta_t = 16.289 [sec])
-239.768 -2.860 (delta_t = 236.908 [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 8.192000
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 8.192000
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 8.192000
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 -2.860 sec. to 36.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79834 ( -0.205208 0.213872 )
Norm@50keV : 1.67305E-03 ( -0.000220207 0.000214682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.74 using 59 PHA bins.
# Reduced chi-squared = 0.7323 for 57 degrees of freedom
# Null hypothesis probability = 9.354084e-01
Photon flux (15-150 keV) in 39.34 sec: 0.230395 ( -0.0256254 0.0256389 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.05958e-07 ( -8.03122e-08 8.18012e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.860 sec. to 36.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77674 ( -0.712837 0.930056 )
Epeak [keV] : 448.064 ( )
Norm@50keV : 1.71911E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7457 for 56 degrees of freedom
# Null hypothesis probability = 9.216354e-01
Photon flux (15-150 keV) in 39.34 sec: 0.230421 ( -0.025736 0.025538 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.05982e-07 ( -8.78856e-08 8.07808e-08 ) ergs/cm2
Band function
Time interval is from -2.860 sec. to 36.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25397 ( 1.25474 5.88024 )
beta : -1.83146 ( 1.82777 0.230874 )
Epeak [keV] : 37.3545 ( -36.603 -36.603 )
Norm@50keV : 4.10024E-03 ( -0.00431938 369412 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.64 using 59 PHA bins.
# Reduced chi-squared = 0.7572 for 55 degrees of freedom
# Null hypothesis probability = 9.081092e-01
Photon flux (15-150 keV) in 39.34 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] : 10.7905 (-1.53637 1.86103)
R^2/D10^2 : 7.96649E-02 (-0.0354444 0.0618243)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.59 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 57 degrees of freedom
# Null hypothesis probability = 1.803110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.593e-08 1.583e-08
25- 50 2.094e-07 3.346e-08
50-150 1.357e-07 4.074e-08
15-150 4.210e-07 6.403e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 101.394 (-35.2569 84.5345)
Norm : 1.01158 (-0.150551 0.183824)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.25 using 59 PHA bins.
# Reduced chi-squared = 0.7587 for 57 degrees of freedom
# Null hypothesis probability = 9.107874e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.040e-07 1.670e-08
25- 50 1.804e-07 2.478e-08
50-150 2.946e-07 1.328e-07
15-150 5.789e-07 1.572e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.61468 (-1.78232 1.88692)
R1^2/D10^2 : 0.382360 (-0.221699 0.814433)
kT2 [keV] : 28.9390 (-10.4504 36.2606)
R2^2/D10^2 : 1.65533E-03 (-0.0014688 0.0066615)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.08 using 59 PHA bins.
# Reduced chi-squared = 0.7650 for 55 degrees of freedom
# Null hypothesis probability = 8.996486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.080e-07 4.314e-08
25- 50 1.746e-07 6.379e-08
50-150 3.340e-07 1.837e-07
15-150 6.165e-07 2.575e-07
Peak spectrum fit
Power-law model
Time interval is from 5.800 sec. to 6.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92374 ( -0.53639 0.642354 )
Norm@50keV : 4.09380E-03 ( -0.00155178 0.00138386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.36 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.897269e-01
Photon flux (15-150 keV) in 1 sec: 0.593515 ( -0.159874 0.159878 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76483e-08 ( -1.27186e-08 1.32612e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.800 sec. to 6.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.74879 ( )
Epeak [keV] : 241.143 ( )
Norm@50keV : 1.56350E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 56 degrees of freedom
# Null hypothesis probability = 4.094140e-01
Photon flux (15-150 keV) in 1 sec: 0.593518 ( -0.1598 0.159714 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74906e-08 ( -1.25236e-08 1.31353e-08 ) ergs/cm2
Band function
Time interval is from 5.800 sec. to 6.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49045 ( 1.49414 1.49414 )
beta : -1.90864 ( 1.91529 0.528215 )
Epeak [keV] : 18.7498 ( -14.3303 -14.3303 )
Norm@50keV : 1.02335E-02 ( -0.010859 25.0649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.36 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 55 degrees of freedom
# Null hypothesis probability = 3.196828e-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] : 9.47517 (-2.86261 4.74367)
R^2/D10^2 : 0.323967 (-0.322885 0.96344)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.70 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.009454e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.802e-09 3.588e-09
25- 50 1.334e-08 7.980e-09
50-150 5.943e-09 4.552e-09
15-150 2.509e-08 1.604e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.9382 (-90.9867 -90.9867)
Norm : 2.64167 (-0.891282 1.81969)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.490122e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.895e-09 4.253e-09
25- 50 1.169e-08 7.235e-09
50-150 1.791e-08 1.438e-08
15-150 3.649e-08 2.475e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.27179 (-1.7886 8.20755)
R1^2/D10^2 : 188.625 (-183.874 970.657)
kT2 [keV] : 14.4746 (-13.6043 -14.5093)
R2^2/D10^2 : 5.74743E-02 (-0.0558511 0.0844825)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.08 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.969127e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.547e-09 4.007e-09
25- 50 9.984e-09 5.915e-09
50-150 1.366e-08 8.880e-09
15-150 3.119e-08 1.784e-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: 1.79834 ( -0.205208 0.213872 )
Norm@50keV : 1.67305E-03 ( -0.000220207 0.000214682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.74 using 59 PHA bins.
# Reduced chi-squared = 0.7323 for 57 degrees of freedom
# Null hypothesis probability = 9.354084e-01
Photon flux (15-150 keV) in 39.34 sec: 0.230395 ( -0.0256254 0.0256389 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.05958e-07 ( -8.03122e-08 8.18012e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77674 ( -0.712837 0.930056 )
Epeak [keV] : 448.064 ( )
Norm@50keV : 1.71911E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7457 for 56 degrees of freedom
# Null hypothesis probability = 9.216354e-01
Photon flux (15-150 keV) in 39.34 sec: 0.230421 ( -0.025736 0.025538 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.05982e-07 ( -8.78856e-08 8.07808e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25397 ( 1.25474 5.88024 )
beta : -1.83146 ( 1.82777 0.230874 )
Epeak [keV] : 37.3545 ( -36.603 -36.603 )
Norm@50keV : 4.10024E-03 ( -0.00431938 369412 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.64 using 59 PHA bins.
# Reduced chi-squared = 0.7572 for 55 degrees of freedom
# Null hypothesis probability = 9.081092e-01
Photon flux (15-150 keV) in 39.34 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) = 1.71e-07
S(50-100 keV) = 1.96e-07
T90 vs. Hardness ratio plot
T90 = 32.6839999556541 sec.
Hardness ratio (energy fluence ratio) = 1.1462
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.04732
Count Ratio (50-100 keV) / (15-25 keV) = 0.660877
Mask shadow pattern
IMX = -5.336869788725411E-01, IMY = 3.507030346768814E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-525.667390 -509.378000
-239.768000 -2.860000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.7477 -40.5403 5.2 36.3 127.9 -1.2975 -2.2 10.0 Vela X-1
116.6947 -16.2374 2.5 17.5 -177.4 0.8873 4.7 ------ UNKNOWN
155.8634 39.8514 2.3 50.4 -19.0 2.4790 5.0 ------ UNKNOWN
71.6646 -25.4295 5.1 59.6 -161.6 4.1579 2.3 ------ UNKNOWN
138.3436 41.3486 3.2 46.6 -36.1 1.5611 3.6 ------ UNKNOWN
85.9397 6.2256 2.3 45.3 -121.3 4.5613 5.2 ------ UNKNOWN
85.6492 6.0650 2.5 45.6 -121.6 4.4702 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.860000 36.480000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3840 -40.5932 5.7 36.3 128.4 0.3541 2.0 7.0 Vela X-1
107.5448 -22.4681 0.9 28.1 -176.2 1.0159 12.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
101.732590 962.364100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5861 -40.7238 4.2 29.8 73.4 -2.9771 -2.7 10.5 Vela X-1
46.4020 -38.3878 3.5 54.1 177.1 7.3952 3.3 ------ UNKNOWN
137.9974 20.0759 3.2 51.9 -23.7 5.1722 3.6 ------ UNKNOWN
136.8881 26.7800 3.4 56.8 -29.4 12.7934 3.4 ------ UNKNOWN
69.0304 3.2291 3.0 45.6 -121.5 9.6825 3.8 ------ UNKNOWN
Plot creation:
Sat Jul 11 00:43:01 EDT 2015