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
76.7210 12.8281 0.0047 13.2344 174.8520 1.2622871 40.954 TRIG_00614390
Foreground time interval of the image:
-0.844 5.344 (delta_t = 6.188 [sec])
Background time interval of the image:
-102.307 -0.844 (delta_t = 101.463 [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 0.256000
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 0.256000
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 0.256000
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 -0.844 sec. to 5.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85450 ( -0.0820631 0.083047 )
Norm@50keV : 1.17441E-02 ( -0.000561676 0.000558178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.845653e-01
Photon flux (15-150 keV) in 6.188 sec: 1.65377 ( -0.0751262 0.0752748 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.68168e-07 ( -3.20345e-08 3.22001e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.844 sec. to 5.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47991 ( -0.357567 0.328651 )
Epeak [keV] : 64.3611 ( -13.1139 105.787 )
Norm@50keV : 1.85520E-02 ( -0.00600013 0.00994134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.68 using 59 PHA bins.
# Reduced chi-squared = 0.9943 for 56 degrees of freedom
# Null hypothesis probability = 4.869173e-01
Photon flux (15-150 keV) in 6.188 sec: 1.61667 ( -0.08148 0.08153 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44808e-07 ( -3.78767e-08 3.79943e-08 ) ergs/cm2
Band function
Time interval is from -0.844 sec. to 5.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87284 ( -6.09394 -4.87284 )
beta : -1.91572 ( -0.0939278 0.0912294 )
Epeak [keV] : 22.1494 ( -3.1819 2.61485 )
Norm@50keV : 2864.13 ( -123.892 9248.59 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9871 for 55 degrees of freedom
# Null hypothesis probability = 5.016474e-01
Photon flux (15-150 keV) in 6.188 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47389e-07 ( -6.47345e-07 -3.77332e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9212 ( )
R^2/D10^2 : 0.387917 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 161.36 using 59 PHA bins.
# Reduced chi-squared = 2.8309 for 57 degrees of freedom
# Null hypothesis probability = 6.538857e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.211e-08 5.755e-09
25- 50 2.252e-07 1.163e-08
50-150 1.916e-07 1.915e-08
15-150 4.889e-07 2.472e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 93.3781 (-14.0841 18.4849)
Norm : 7.32978 (-0.492791 0.54219)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.30 using 59 PHA bins.
# Reduced chi-squared = 0.9877 for 57 degrees of freedom
# Null hypothesis probability = 5.013344e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.185e-07 9.251e-09
25- 50 2.020e-07 9.839e-09
50-150 3.145e-07 8.905e-08
15-150 6.349e-07 8.505e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.22341 (-0.948037 1.06935)
R1^2/D10^2 : 2.98216 (-1.2419 2.48903)
kT2 [keV] : 21.0201 (-3.05214 4.76803)
R2^2/D10^2 : 3.45019E-02 (-0.0189468 0.0307603)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.17 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.260842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.177e-07 1.881e-08
25- 50 1.994e-07 2.299e-08
50-150 3.132e-07 5.975e-08
15-150 6.303e-07 8.428e-08
Peak spectrum fit
Power-law model
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68888 ( -0.0686357 0.0691102 )
Norm@50keV : 4.63432E-02 ( -0.00188675 0.00188183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.41 using 59 PHA bins.
# Reduced chi-squared = 1.358 for 57 degrees of freedom
# Null hypothesis probability = 3.731664e-02
Photon flux (15-150 keV) in 1 sec: 6.13118 ( -0.25122 0.251602 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29473e-07 ( -1.82741e-08 1.83248e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10958 ( -0.312943 0.290382 )
Epeak [keV] : 75.3293 ( -11.5038 27.6376 )
Norm@50keV : 9.16060E-02 ( -0.0259727 0.0398387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.97 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 56 degrees of freedom
# Null hypothesis probability = 1.925730e-01
Photon flux (15-150 keV) in 1 sec: 5.95166 ( -0.26553 0.26572 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11523e-07 ( -2.0448e-08 2.0414e-08 ) ergs/cm2
Band function
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.681851 ( -0.552041 1.05405 )
beta : -2.01105 ( 2.00967 0.197365 )
Epeak [keV] : 55.4879 ( -17.1015 25.9041 )
Norm@50keV : 0.167562 ( -0.0890446 0.747775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.333400e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12858e-07 ( -4.12851e-07 -1.9485e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.4750 ( )
R^2/D10^2 : 0.976730 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 176.06 using 59 PHA bins.
# Reduced chi-squared = 3.0888 for 57 degrees of freedom
# Null hypothesis probability = 4.436658e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.757e-08 2.800e-09
25- 50 1.344e-07 6.200e-09
50-150 1.575e-07 1.260e-08
15-150 3.294e-07 1.410e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 138.673 (-23.6532 27.0991)
Norm : 25.4207 (-1.21451 1.46518)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.73 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.002591e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.569e-08 4.695e-09
25- 50 1.203e-07 7.750e-09
50-150 2.297e-07 6.120e-08
15-150 4.157e-07 6.620e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.57753 (-1.20267 1.25731)
R1^2/D10^2 : 5.12036 (-1.88156 3.76881)
kT2 [keV] : 24.6836 (-4.01442 6.65147)
R2^2/D10^2 : 7.59458E-02 (-0.0447935 0.079561)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.28 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 55 degrees of freedom
# Null hypothesis probability = 1.076772e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.900e-08 7.930e-09
25- 50 1.265e-07 1.410e-08
50-150 2.241e-07 4.405e-08
15-150 4.097e-07 6.000e-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: 1.85450 ( -0.0820631 0.083047 )
Norm@50keV : 1.17441E-02 ( -0.000561676 0.000558178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.845653e-01
Photon flux (15-150 keV) in 6.188 sec: 1.65377 ( -0.0751262 0.0752748 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.68168e-07 ( -3.20345e-08 3.22001e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47991 ( -0.357567 0.328651 )
Epeak [keV] : 64.3611 ( -13.1139 105.787 )
Norm@50keV : 1.85520E-02 ( -0.00600013 0.00994134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.68 using 59 PHA bins.
# Reduced chi-squared = 0.9943 for 56 degrees of freedom
# Null hypothesis probability = 4.869173e-01
Photon flux (15-150 keV) in 6.188 sec: 1.61667 ( -0.08148 0.08153 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44808e-07 ( -3.78767e-08 3.79943e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87284 ( -6.09394 -4.87284 )
beta : -1.91572 ( -0.0939278 0.0912294 )
Epeak [keV] : 22.1494 ( -3.1819 2.61485 )
Norm@50keV : 2864.13 ( -123.892 9248.59 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9871 for 55 degrees of freedom
# Null hypothesis probability = 5.016474e-01
Photon flux (15-150 keV) in 6.188 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47389e-07 ( -6.47345e-07 -3.77332e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.92e-07
S(50-100 keV) = 2.12e-07
T90 vs. Hardness ratio plot
T90 = 3.92399996519089 sec.
Hardness ratio (energy fluence ratio) = 1.10417
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08769
Count Ratio (50-100 keV) / (15-25 keV) = 0.619508
Mask shadow pattern
IMX = -2.342332408229152E-01, IMY = -2.110245017262507E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-102.307400 -0.844000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6220 22.0127 0.3 22.7 -164.1 4.4190 36.9 0.6 Crab
81.8001 -57.1749 2.8 57.0 3.0 2.9219 4.1 ------ UNKNOWN
86.7492 -28.4196 2.4 29.2 -9.2 0.6427 4.8 ------ UNKNOWN
96.1446 -53.5830 2.8 55.2 -7.5 1.6548 4.2 ------ UNKNOWN
97.9350 -9.0938 2.3 20.8 -59.4 0.6692 5.1 ------ UNKNOWN
99.2575 3.2066 2.7 20.5 -95.0 0.5522 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.844000 5.344000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6439 21.9987 11.8 22.7 -164.1 -0.0306 -1.0 1.1 Crab
46.3326 -36.1499 2.5 47.0 41.4 0.6721 4.7 ------ UNKNOWN
67.9811 -51.5055 2.3 52.1 13.5 0.6527 5.1 ------ UNKNOWN
76.7210 12.8281 0.3 13.2 174.9 1.2622 41.0 ------ UNKNOWN
113.5932 -6.2034 2.3 35.0 -74.6 0.3041 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
44.092590 963.001500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6252 22.0121 0.2 11.3 -144.5 38.8168 61.8 0.5 Crab
81.8024 30.7491 3.1 18.5 -165.2 2.1517 3.8 ------ UNKNOWN
101.1793 69.5536 3.6 58.8 -169.3 13.1223 3.2 ------ UNKNOWN
Plot creation:
Thu May 28 14:16:38 EDT 2015