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
107.3430 1.0662 0.0105 29.1591 14.2143 2.1897984 18.414 TRIG_00275087
Foreground time interval of the image:
-47.884 36.101 (delta_t = 83.985 [sec])
Background time interval of the image:
-239.200 -47.884 (delta_t = 191.316 [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 4.096000
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 4.096000
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 4.096000
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 -47.884 sec. to 109.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65699 ( -0.094867 0.0954638 )
Norm@50keV : 1.84159E-03 ( -9.59557e-05 9.545e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.505121e-01
Photon flux (15-150 keV) in 157.4 sec: 0.241023 ( -0.012376 0.0124082 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69401e-06 ( -1.49382e-07 1.50297e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -47.884 sec. to 109.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65820 ( -0.217223 0.0933106 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 1.84204E-03 ( -0.000709683 0.000481264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.52 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.159088e-01
Photon flux (15-150 keV) in 157.4 sec: 0.241094 ( -0.012281 0.012232 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69014e-06 ( -1.458e-07 1.50018e-07 ) ergs/cm2
Band function
Time interval is from -47.884 sec. to 109.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.05324 ( -3.45599 -3.45599 )
beta : -1.69328 ( -0.116951 0.10732 )
Epeak [keV] : 21.8091 ( -22.2381 99.4248 )
Norm@50keV : 91.8558 ( -91.8633 8327.68 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.56 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Null hypothesis probability = 3.460234e-01
Photon flux (15-150 keV) in 157.4 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] : 12.8983 ( )
R^2/D10^2 : 4.28121E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 194.04 using 59 PHA bins.
# Reduced chi-squared = 3.4042 for 57 degrees of freedom
# Null hypothesis probability = 7.706614e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.378e-07 2.400e-08
25- 50 8.120e-07 5.084e-08
50-150 8.501e-07 9.790e-08
15-150 1.900e-06 1.196e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 159.781 (-37.7047 -160.334)
Norm : 0.974924 (-0.0568433 0.0643843)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.90 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.736847e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.919e-07 3.030e-08
25- 50 7.329e-07 8.862e-08
50-150 1.484e-06 5.153e-07
15-150 2.609e-06 5.635e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.13285 (-0.775807 0.826352)
R1^2/D10^2 : 0.289423 (-0.0944242 0.15206)
kT2 [keV] : 33.6531 (-6.03966 9.69553)
R2^2/D10^2 : 1.20985E-03 (-0.000636727 0.00109018)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.89 using 59 PHA bins.
# Reduced chi-squared = 0.9435 for 55 degrees of freedom
# Null hypothesis probability = 5.940645e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.109e-07 5.501e-08
25- 50 7.410e-07 8.303e-08
50-150 1.628e-06 4.452e-07
15-150 2.780e-06 5.816e-07
Peak spectrum fit
Power-law model
Time interval is from 70.224 sec. to 71.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48624 ( -0.235944 0.239822 )
Norm@50keV : 7.45468E-03 ( -0.00105963 0.00104475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.23 using 59 PHA bins.
# Reduced chi-squared = 0.6005 for 57 degrees of freedom
# Null hypothesis probability = 9.927454e-01
Photon flux (15-150 keV) in 1 sec: 0.927237 ( -0.124221 0.124298 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.08807e-08 ( -1.11308e-08 1.1335e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 70.224 sec. to 71.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37042 ( -0.986409 1.09918 )
Epeak [keV] : 261.641 ( -261.641 -261.641 )
Norm@50keV : 8.57975E-03 ( -0.00215981 0.0191261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.18 using 59 PHA bins.
# Reduced chi-squared = 0.6103 for 56 degrees of freedom
# Null hypothesis probability = 9.905897e-01
Photon flux (15-150 keV) in 1 sec: 0.922944 ( -0.125955 0.127086 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01667e-08 ( -1.24952e-08 1.19064e-08 ) ergs/cm2
Band function
Time interval is from 70.224 sec. to 71.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97208 ( -4.97208 -4.97208 )
beta : -1.52202 ( -0.269993 0.249932 )
Epeak [keV] : 21.1135 ( -21.1135 6.91939 )
Norm@50keV : 2123.62 ( -282.4 4.18898e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.99 using 59 PHA bins.
# Reduced chi-squared = 0.6181 for 55 degrees of freedom
# Null hypothesis probability = 9.884028e-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] : 14.1286 (-2.35553 3.00669)
R^2/D10^2 : 0.128708 (-0.0630383 0.115944)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.42 using 59 PHA bins.
# Reduced chi-squared = 0.8494 for 57 degrees of freedom
# Null hypothesis probability = 7.837224e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.422e-09 1.491e-09
25- 50 2.035e-08 4.460e-09
50-150 2.687e-08 7.935e-09
15-150 5.264e-08 9.895e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-84.5198 -199.363)
Norm : 3.78909 (-0.504665 0.504665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.45 using 59 PHA bins.
# Reduced chi-squared = 0.6044 for 57 degrees of freedom
# Null hypothesis probability = 9.921420e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.435e-09 5.340e-09
25- 50 1.815e-08 1.012e-08
50-150 3.981e-08 2.245e-08
15-150 6.739e-08 3.704e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.42206 (-3.08657 4.16656)
R1^2/D10^2 : 1.27987 (-0.977042 15.5934)
kT2 [keV] : 25.4928 (-8.923 54.7316)
R2^2/D10^2 : 1.34935E-02 (-0.0126806 0.0431132)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.14 using 59 PHA bins.
# Reduced chi-squared = 0.6389 for 55 degrees of freedom
# Null hypothesis probability = 9.830089e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.192e-09 4.953e-09
25- 50 1.749e-08 8.950e-09
50-150 4.256e-08 2.334e-08
15-150 6.924e-08 3.660e-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: 1.69079 ( -0.140287 0.142591 )
Norm@50keV : 1.67250E-03 ( -0.000139364 0.000137816 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.97 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.683986e-01
Photon flux (15-150 keV) in 83.98 sec: 0.221416 ( -0.0171744 0.0172002 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30143e-06 ( -1.14062e-07 1.1522e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63492 ( -0.474228 0.687685 )
Epeak [keV] : 306.292 ( )
Norm@50keV : 1.79175E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.01 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 56 degrees of freedom
# Null hypothesis probability = 3.324193e-01
Photon flux (15-150 keV) in 83.98 sec: 0.221346 ( -0.008916 0.017175 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3012e-06 ( -1.2833e-07 1.14398e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.41286 ( -3.40702 -3.40702 )
beta : -1.74212 ( -0.206441 0.169008 )
Epeak [keV] : 22.7427 ( -22.7455 140.172 )
Norm@50keV : 21.7652 ( -20.8838 153.373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.18 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.254543e-01
Photon flux (15-150 keV) in 83.98 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) = 7.16e-07
S(50-100 keV) = 9.08e-07
T90 vs. Hardness ratio plot
T90 = 115.692000001669 sec.
Hardness ratio (energy fluence ratio) = 1.26816
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.20899
Count Ratio (50-100 keV) / (15-25 keV) = 0.788473
Mask shadow pattern
IMX = 5.408630220464085E-01, IMY = -1.370027779097523E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.200000 -47.884000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6197 22.0227 0.5 48.0 -27.3 6.2372 21.6 0.9 Crab
135.3589 -40.7088 168.6 37.9 110.4 0.0239 0.1 12.0 Vela X-1
31.9279 -70.3018 2.6 57.2 -173.8 3.0351 4.4 ------ UNKNOWN
42.4913 -62.7641 2.8 50.6 -167.0 1.4161 4.1 ------ UNKNOWN
76.5130 -17.3112 2.2 17.8 -82.5 0.7332 5.1 ------ UNKNOWN
22.9246 -57.0908 3.9 58.9 -157.7 3.1546 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-47.884000 36.100590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7713 22.0652 5.2 48.0 -27.1 0.5286 2.2 8.3 Crab
135.5926 -40.6688 8.6 38.0 110.3 -0.4049 -1.3 7.4 Vela X-1
107.3430 1.0662 0.6 29.2 14.2 2.1898 18.4 ------ UNKNOWN
91.7124 27.2264 2.7 52.2 -16.9 1.1454 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
85.700600 302.890000
420.800000 532.700590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6240 22.0245 0.3 31.2 -54.4 12.5806 37.3 0.8 Crab
135.5903 -40.6706 3.0 49.0 143.3 -4.0911 -3.8 7.5 Vela X-1
138.8006 -18.7074 2.5 36.7 115.9 2.5056 4.5 ------ UNKNOWN
134.1773 45.7299 2.4 50.5 15.8 2.9487 4.8 ------ UNKNOWN
120.7105 35.5872 2.7 36.7 10.0 1.2357 4.2 ------ UNKNOWN
109.8524 36.0199 2.9 35.0 -4.8 1.1741 4.0 ------ UNKNOWN
101.1822 37.8932 3.2 37.2 -16.4 1.0977 3.6 ------ UNKNOWN
90.3267 -20.2434 2.4 27.1 -151.2 1.0511 4.7 ------ UNKNOWN
85.9870 41.6994 2.4 44.9 -31.0 2.1178 4.8 ------ UNKNOWN
84.2882 56.7673 3.7 58.7 -22.9 4.6193 3.2 ------ UNKNOWN
69.8457 32.0825 3.6 47.0 -53.2 3.6229 3.2 ------ UNKNOWN
Plot creation:
Tue Jun 23 22:57:25 EDT 2015