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
79.2888 64.1913 0.0196 44.2350 173.5517 0.3888617 9.822 TRIG_00441664
Foreground time interval of the image:
-0.752 2.248 (delta_t = 3.000 [sec])
Background time interval of the image:
-515.551 -488.687 (delta_t = 26.864 [sec])
-239.752 -0.752 (delta_t = 239.000 [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 1.024000
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 1.024000
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 1.024000
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 -0.752 sec. to 2.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56921 ( -0.27414 0.277141 )
Norm@50keV : 8.46202E-03 ( -0.00142392 0.00141301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.86 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.215323e-01
Photon flux (15-150 keV) in 3 sec: 1.07730 ( -0.181746 0.182254 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38352e-07 ( -4.24614e-08 4.28925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.752 sec. to 2.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23550 ( -1.26684 1.16357 )
Epeak [keV] : 110.845 ( -110.959 -110.959 )
Norm@50keV : 1.26885E-02 ( -0.00523266 0.0470187 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.56 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 56 degrees of freedom
# Null hypothesis probability = 2.023060e-01
Photon flux (15-150 keV) in 3 sec: 1.06693 ( -0.184431 0.18479 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33019e-07 ( -4.7154e-08 4.58511e-08 ) ergs/cm2
Band function
Time interval is from -0.752 sec. to 2.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91457 ( -13.9651 -4.91457 )
beta : -1.84372 ( -0.685867 0.367447 )
Epeak [keV] : 29.9290 ( -10.3846 8.07148 )
Norm@50keV : 291.152 ( -46.8729 4144.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Null hypothesis probability = 2.414499e-01
Photon flux (15-150 keV) in 3 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] : 12.5449 (-2.49007 3.54883)
R^2/D10^2 : 0.229611 (-0.136484 0.287303)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.35 using 59 PHA bins.
# Reduced chi-squared = 1.287 for 57 degrees of freedom
# Null hypothesis probability = 7.127902e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.299e-08 7.590e-09
25- 50 7.612e-08 2.062e-08
50-150 7.412e-08 2.835e-08
15-150 1.732e-07 4.237e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.775 (-108.857 -198.622)
Norm : 4.40182 (-0.721015 0.952323)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.52 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.304677e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.289e-08 1.911e-08
25- 50 6.326e-08 3.567e-08
50-150 1.386e-07 7.714e-08
15-150 2.348e-07 1.305e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.66647 (-2.12993 2.58703)
R1^2/D10^2 : 0.707696 (-0.418575 0.636936)
kT2 [keV] : 44.2748 (-21.4651 -44.1813)
R2^2/D10^2 : 2.18917E-03 (-0.00212142 0.0157864)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.61 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Null hypothesis probability = 2.805426e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.195e-08 1.826e-08
25- 50 7.168e-08 4.048e-08
50-150 1.371e-07 7.769e-08
15-150 2.408e-07 1.217e-07
Peak spectrum fit
Power-law model
Time interval is from 0.248 sec. to 1.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64572 ( -0.303448 0.312895 )
Norm@50keV : 1.28451E-02 ( -0.00259323 0.00255811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.85 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 57 degrees of freedom
# Null hypothesis probability = 1.027483e-01
Photon flux (15-150 keV) in 1 sec: 1.67490 ( -0.325325 0.325941 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19514e-07 ( -2.50918e-08 2.54356e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.248 sec. to 1.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.635984 ( -2.25297 1.31407 )
Epeak [keV] : 61.0571 ( -13.6721 -61.036 )
Norm@50keV : 4.63956E-02 ( -0.046448 0.968973 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.35 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 56 degrees of freedom
# Null hypothesis probability = 1.084300e-01
Photon flux (15-150 keV) in 1 sec: 1.63846 ( -0.33077 0.33054 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10868e-07 ( -2.91823e-08 2.8608e-08 ) ergs/cm2
Band function
Time interval is from 0.248 sec. to 1.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94653 ( -5.14172 -4.94653 )
beta : -2.40733 ( -0.94712 0.594139 )
Epeak [keV] : 35.0541 ( -7.38048 5.35251 )
Norm@50keV : 209.044 ( -38.2587 719.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.50 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Null hypothesis probability = 1.784809e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10713e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6364 (-2.31439 3.15157)
R^2/D10^2 : 0.484733 (-0.287046 0.616361)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.32 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 57 degrees of freedom
# Null hypothesis probability = 8.315699e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.384e-08 5.201e-09
25- 50 4.198e-08 1.282e-08
50-150 3.347e-08 1.515e-08
15-150 8.928e-08 2.703e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 145.493 (-75.0254 -142.965)
Norm : 7.00807 (-1.46159 2.06111)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.84 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.182383e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.804e-08 1.045e-08
25- 50 3.330e-08 1.897e-08
50-150 6.489e-08 3.949e-08
15-150 1.162e-07 6.910e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.12107 (-2.6498 2.92614)
R1^2/D10^2 : 1.00915 (-0.629374 1.81972)
kT2 [keV] : 48.8799 (-31.448 -48.8799)
R2^2/D10^2 : 2.06902E-03 (-0.00189316 0.071355)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.00 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 55 degrees of freedom
# Null hypothesis probability = 1.470807e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.701e-08 1.005e-08
25- 50 3.966e-08 2.308e-08
50-150 6.138e-08 3.007e-08
15-150 1.180e-07 5.539e-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: 1.56921 ( -0.27414 0.277141 )
Norm@50keV : 8.46202E-03 ( -0.00142392 0.00141301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.86 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.215323e-01
Photon flux (15-150 keV) in 3 sec: 1.07730 ( -0.181746 0.182254 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38352e-07 ( -4.24614e-08 4.28925e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23550 ( -1.26684 1.16357 )
Epeak [keV] : 110.845 ( -110.959 -110.959 )
Norm@50keV : 1.26885E-02 ( -0.00523266 0.0470187 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.56 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 56 degrees of freedom
# Null hypothesis probability = 2.023060e-01
Photon flux (15-150 keV) in 3 sec: 1.06693 ( -0.184431 0.18479 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33019e-07 ( -4.7154e-08 4.58511e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91457 ( -13.6314 -4.91457 )
beta : -1.84372 ( -0.685867 0.367447 )
Epeak [keV] : 29.9290 ( -13.7618 8.07155 )
Norm@50keV : 291.152 ( -46.8729 4144.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Null hypothesis probability = 2.414499e-01
Photon flux (15-150 keV) in 3 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) = 6.09e-08
S(50-100 keV) = 8.21e-08
T90 vs. Hardness ratio plot
T90 = 3 sec.
Hardness ratio (energy fluence ratio) = 1.34811
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.79206
Count Ratio (50-100 keV) / (15-25 keV) = 0.936237
Mask shadow pattern
IMX = -9.674886340401854E-01, IMY = -1.093474487486454E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-515.551400 -488.687000
-239.752000 -0.752000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
101.1183 30.2729 2.2 40.4 118.2 3.8992 5.3 ------ UNKNOWN
160.3167 14.1197 2.3 29.9 8.7 1.1662 4.9 ------ UNKNOWN
165.6803 67.3611 2.9 26.2 -136.6 0.9062 4.0 ------ UNKNOWN
194.5105 -0.3249 3.6 58.7 -25.9 4.9541 3.2 ------ UNKNOWN
200.0597 13.6426 3.8 51.9 -42.2 3.6259 3.1 ------ UNKNOWN
205.9678 38.1128 3.0 42.3 -74.0 3.4147 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.752000 2.248000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
108.7013 43.9098 2.3 29.6 136.4 0.1363 4.9 ------ UNKNOWN
79.2888 64.1913 1.2 44.2 173.6 0.3888 9.8 ------ UNKNOWN
199.8807 43.7206 2.4 36.0 -79.8 0.1884 4.8 ------ UNKNOWN
217.8520 73.5540 2.7 43.4 -127.9 0.2160 4.3 ------ UNKNOWN
203.4457 43.2254 2.6 38.6 -80.3 0.2575 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
89.948610 162.348600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6444 22.0207 1.7 42.3 121.7 3.0729 6.9 0.7 Crab
138.6816 34.5345 2.7 46.1 48.1 2.2163 4.2 ------ UNKNOWN
117.5867 56.6089 2.4 20.0 42.0 0.5222 4.8 ------ UNKNOWN
51.0625 49.0457 2.2 21.4 -174.0 0.5239 5.2 ------ UNKNOWN
54.7942 55.7085 2.2 14.8 -166.0 0.4933 5.3 ------ UNKNOWN
38.2370 66.2748 2.1 17.0 -117.1 0.5402 5.5 ------ UNKNOWN
207.0103 52.4134 2.4 56.5 -17.0 1.8488 4.9 ------ UNKNOWN
217.5078 76.6975 2.3 36.7 -37.5 0.7066 4.9 ------ UNKNOWN
241.2071 63.0794 2.9 52.0 -42.1 2.2137 3.9 ------ UNKNOWN
0.6559 41.5585 2.6 48.6 -130.4 2.1207 4.5 ------ UNKNOWN
Plot creation:
Sat May 30 23:13:51 EDT 2015