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
163.5003 -45.4619 0.0099 14.4243 83.1554 0.4224468 19.276 TRIG_00416103
Foreground time interval of the image:
-0.284 4.112 (delta_t = 4.396 [sec])
Background time interval of the image:
-239.592 -0.284 (delta_t = 239.308 [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 0.512000
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 0.512000
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 0.512000
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 -0.284 sec. to 4.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27155 ( -0.17886 0.18958 )
Norm@50keV : 4.74712E-03 ( -0.000611198 0.000600598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.56 using 59 PHA bins.
# Reduced chi-squared = 0.7291 for 57 degrees of freedom
# Null hypothesis probability = 9.380525e-01
Photon flux (15-150 keV) in 4.396 sec: 0.816675 ( -0.0718796 0.0718988 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98413e-07 ( -2.09703e-08 2.14527e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.284 sec. to 4.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79504 ( -0.910734 0.202921 )
Epeak [keV] : 16.4648 ( )
Norm@50keV : 9.24380E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.35 using 59 PHA bins.
# Reduced chi-squared = 0.7206 for 56 degrees of freedom
# Null hypothesis probability = 9.429020e-01
Photon flux (15-150 keV) in 4.396 sec: 0.800654 ( -0.075371 0.075705 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87919e-07 ( -2.48273e-08 2.66173e-08 ) ergs/cm2
Band function
Time interval is from -0.284 sec. to 4.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.80295 ( -3.59547 1.86736 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 16.2556 ( -8.2685 10.8854 )
Norm@50keV : 9.10200E-03 ( -0.00315774 0.0245023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.35 using 59 PHA bins.
# Reduced chi-squared = 0.7337 for 55 degrees of freedom
# Null hypothesis probability = 9.304241e-01
Photon flux (15-150 keV) in 4.396 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] : 8.23430 (-0.814929 0.909936)
R^2/D10^2 : 0.776673 (-0.269448 0.412575)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 57 degrees of freedom
# Null hypothesis probability = 2.968865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.273e-08 5.535e-09
25- 50 7.859e-08 9.078e-09
50-150 2.267e-08 6.456e-09
15-150 1.440e-07 1.681e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.8416 (-9.16094 13.2962)
Norm : 5.00667 (-0.831542 1.03688)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.14 using 59 PHA bins.
# Reduced chi-squared = 0.7218 for 57 degrees of freedom
# Null hypothesis probability = 9.437134e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.166e-08 6.132e-09
25- 50 6.995e-08 7.517e-09
50-150 5.824e-08 1.543e-08
15-150 1.798e-07 2.016e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.12509 (-1.75564 1.66571)
R1^2/D10^2 : 3.79153 (-2.36318 16.6977)
kT2 [keV] : 15.7451 (-4.89124 12.8321)
R2^2/D10^2 : 3.76684E-02 (-0.0338088 0.11648)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.96 using 59 PHA bins.
# Reduced chi-squared = 0.7629 for 55 degrees of freedom
# Null hypothesis probability = 9.020140e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.322e-08 1.967e-08
25- 50 6.636e-08 2.722e-08
50-150 6.229e-08 3.479e-08
15-150 1.819e-07 8.368e-08
Peak spectrum fit
Power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14877 ( -0.213611 0.229351 )
Norm@50keV : 8.29201E-03 ( -0.00130349 0.00127251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.40 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.602142e-01
Photon flux (15-150 keV) in 1 sec: 1.33685 ( -0.151211 0.151227 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.74468e-08 ( -1.05988e-08 1.08731e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47742 ( -1.01694 0.726169 )
Epeak [keV] : 31.4450 ( )
Norm@50keV : 2.06559E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.53 using 59 PHA bins.
# Reduced chi-squared = 0.9917 for 56 degrees of freedom
# Null hypothesis probability = 4.924833e-01
Photon flux (15-150 keV) in 1 sec: 1.30755 ( -0.15482 0.15507 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.28211e-08 ( -1.11699e-08 1.20889e-08 ) ergs/cm2
Band function
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47764 ( 1.59192 6.38323 )
beta : -10.0000 ( 10 2.84217e-14 )
Epeak [keV] : 31.4371 ( -15.0011 21.677 )
Norm@50keV : 2.06461E-02 ( -0.0116883 0.061828 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.53 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.545256e-01
Photon flux (15-150 keV) in 1 sec: 1.31340 ( 5.6866 -0.16163 ) 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] : 9.35029 (-1.23352 1.41688)
R^2/D10^2 : 0.791125 (-0.336128 0.589753)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.68 using 59 PHA bins.
# Reduced chi-squared = 1.258 for 57 degrees of freedom
# Null hypothesis probability = 9.126425e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.372e-08 2.982e-09
25- 50 3.092e-08 4.555e-09
50-150 1.324e-08 3.813e-09
15-150 5.788e-08 8.475e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.2775 (-14.0021 22.6036)
Norm : 7.41075 (-1.33094 1.75017)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 0.9764 for 57 degrees of freedom
# Null hypothesis probability = 5.257394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.830e-08 2.785e-09
25- 50 2.669e-08 3.585e-09
50-150 2.701e-08 8.530e-09
15-150 7.200e-08 1.206e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.99434 (-1.40456 1.75931)
R1^2/D10^2 : 15.1318 (-11.6873 39.2935)
kT2 [keV] : 13.9173 (-2.90764 4.73091)
R2^2/D10^2 : 0.133613 (-0.0962467 0.142221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.23 using 59 PHA bins.
# Reduced chi-squared = 0.9859 for 55 degrees of freedom
# Null hypothesis probability = 5.041811e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.914e-08 9.754e-09
25- 50 2.514e-08 1.033e-08
50-150 2.577e-08 1.486e-08
15-150 7.005e-08 3.299e-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: 2.27155 ( -0.17886 0.18958 )
Norm@50keV : 4.74712E-03 ( -0.000611198 0.000600598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.56 using 59 PHA bins.
# Reduced chi-squared = 0.7291 for 57 degrees of freedom
# Null hypothesis probability = 9.380525e-01
Photon flux (15-150 keV) in 4.396 sec: 0.816675 ( -0.0718796 0.0718988 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98413e-07 ( -2.09703e-08 2.14527e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79504 ( -0.910734 0.202921 )
Epeak [keV] : 16.4648 ( )
Norm@50keV : 9.24380E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.35 using 59 PHA bins.
# Reduced chi-squared = 0.7206 for 56 degrees of freedom
# Null hypothesis probability = 9.429020e-01
Photon flux (15-150 keV) in 4.396 sec: 0.800654 ( -0.075373 0.075705 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87919e-07 ( -2.48273e-08 2.66173e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.80295 ( -3.59547 1.86736 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 16.2556 ( -8.26851 10.8854 )
Norm@50keV : 9.10200E-03 ( -0.00315774 0.0245023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.35 using 59 PHA bins.
# Reduced chi-squared = 0.7337 for 55 degrees of freedom
# Null hypothesis probability = 9.304241e-01
Photon flux (15-150 keV) in 4.396 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) = 6.37e-08
S(50-100 keV) = 5.28e-08
T90 vs. Hardness ratio plot
T90 = 3.83599996566772 sec.
Hardness ratio (energy fluence ratio) = 0.828885
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.95743
Count Ratio (50-100 keV) / (15-25 keV) = 0.386844
Mask shadow pattern
IMX = 3.065326062637548E-02, IMY = -2.553761083342893E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.592000 -0.284000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5303 -40.5448 0.4 25.6 27.3 4.9623 25.7 0.6 Vela X-1
169.9938 -60.7647 0.0 3.8 -172.9 0.2377 1.5 12.7 Cen X-3
186.6229 -62.7737 0.5 11.8 -165.1 4.0610 22.3 1.0 GX 301-2
264.7129 -44.3330 5.6 58.1 -155.1 3.0020 2.1 7.1 4U 1735-44
114.7716 -21.3307 2.3 51.0 17.9 2.8542 5.0 ------ UNKNOWN
237.6996 -33.6275 3.1 54.1 177.0 2.2608 3.7 ------ UNKNOWN
255.7179 -48.7995 1.5 50.8 -157.7 3.7419 7.5 ------ UNKNOWN
295.3648 -71.6873 2.6 44.4 -118.8 3.7741 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.284000 4.112000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5107 -40.6540 3.6 25.5 27.2 -0.0789 -3.2 6.0 Vela X-1
169.9938 -60.7647 0.0 3.8 -172.9 -0.0414 -2.1 12.7 Cen X-3
186.9093 -62.5972 125.8 12.0 -166.0 0.0017 0.1 12.5 GX 301-2
264.8621 -44.5968 5.9 57.9 -154.8 -0.2478 -2.0 10.2 4U 1735-44
163.5003 -45.4619 0.6 14.4 83.2 0.4223 19.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
48.308590 962.468000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5315 -40.5493 0.3 20.9 -12.9 20.0855 39.4 0.4 Vela X-1
170.2958 -60.6269 88.7 15.7 -119.1 0.0683 0.1 0.6 Cen X-3
186.6527 -62.7656 0.3 21.7 -135.7 18.9176 40.8 0.3 GX 301-2
153.8941 -34.0704 2.9 13.6 37.4 1.7937 3.9 ------ UNKNOWN
217.2620 -55.0724 2.7 34.7 -160.8 2.4512 4.3 ------ UNKNOWN
90.8343 -60.9157 5.4 43.5 -64.2 6.4081 2.1 ------ UNKNOWN
89.4517 -52.3189 5.1 47.0 -53.1 6.0110 2.3 ------ UNKNOWN
99.4057 -79.8399 3.3 40.9 -92.6 9.7591 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 01:59:37 EDT 2015