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
134.3596 56.4211 0.0082 30.1286 14.8159 1.7198390 23.588 TRIG_00453747
Foreground time interval of the image:
-1.152 25.533 (delta_t = 26.685 [sec])
Background time interval of the image:
-239.168 -1.152 (delta_t = 238.016 [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 2.048000
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 2.048000
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 2.048000
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 -1.152 sec. to 26.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20924 ( -0.118338 0.116885 )
Norm@50keV : 4.15141E-03 ( -0.000276928 0.00027683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.07 using 59 PHA bins.
# Reduced chi-squared = 0.8959 for 57 degrees of freedom
# Null hypothesis probability = 6.960511e-01
Photon flux (15-150 keV) in 27.65 sec: 0.487929 ( -0.0339505 0.0340316 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16154e-06 ( -8.43032e-08 8.4664e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.152 sec. to 26.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.882795 ( -0.513243 0.377941 )
Epeak [keV] : 185.650 ( -82.2153 -185.651 )
Norm@50keV : 5.91466E-03 ( -0.00192382 0.00422566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.63 using 59 PHA bins.
# Reduced chi-squared = 0.8862 for 56 degrees of freedom
# Null hypothesis probability = 7.131925e-01
Photon flux (15-150 keV) in 27.65 sec: 0.480714 ( -0.035479 0.035471 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13851e-06 ( -9.23482e-08 9.13611e-08 ) ergs/cm2
Band function
Time interval is from -1.152 sec. to 26.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.12207E-02 ( -1.30873 0.230486 )
beta : -1.39486 ( 1.39005 0.215134 )
Epeak [keV] : 69.3597 ( -38.7614 152.976 )
Norm@50keV : 1.78063E-02 ( -0.0179456 47.0752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.93 using 59 PHA bins.
# Reduced chi-squared = 0.8714 for 55 degrees of freedom
# Null hypothesis probability = 7.392646e-01
Photon flux (15-150 keV) in 27.65 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] : 18.5452 (-1.61526 1.82879)
R^2/D10^2 : 2.85571E-02 (-0.00771431 0.0102717)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.47 using 59 PHA bins.
# Reduced chi-squared = 1.517 for 57 degrees of freedom
# Null hypothesis probability = 7.126802e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.384e-08 7.576e-09
25- 50 2.545e-07 2.912e-08
50-150 6.400e-07 7.728e-08
15-150 9.483e-07 8.032e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.04070 (-0.138523 0.138501)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.40 using 59 PHA bins.
# Reduced chi-squared = 1.288 for 57 degrees of freedom
# Null hypothesis probability = 7.075711e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.405e-07 1.212e-08
25- 50 2.702e-07 3.655e-08
50-150 5.927e-07 1.580e-07
15-150 1.003e-06 2.072e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1266 (-2.32041 2.60338)
R1^2/D10^2 : 0.139510 (-0.0637047 0.147709)
kT2 [keV] : 41.0029 (-12.761 68.9387)
R2^2/D10^2 : 1.69347E-03 (-0.00148734 0.0040411)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.15 using 59 PHA bins.
# Reduced chi-squared = 0.8755 for 55 degrees of freedom
# Null hypothesis probability = 7.315860e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.088e-08 2.425e-08
25- 50 2.733e-07 6.950e-08
50-150 7.861e-07 3.332e-07
15-150 1.150e-06 4.084e-07
Peak spectrum fit
Power-law model
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07331 ( -0.29191 0.278272 )
Norm@50keV : 9.37467E-03 ( -0.00149089 0.00148533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 57 degrees of freedom
# Null hypothesis probability = 9.207944e-01
Photon flux (15-150 keV) in 1 sec: 1.08476 ( -0.177189 0.177936 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.88676e-08 ( -1.69626e-08 1.7097e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07898 ( -0.301084 0.273705 )
Epeak [keV] : 9999.17 ( -9999.36 -9999.36 )
Norm@50keV : 9.42243E-03 ( -0.00147434 0.0166642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.68 using 59 PHA bins.
# Reduced chi-squared = 0.7622 for 56 degrees of freedom
# Null hypothesis probability = 9.049970e-01
Photon flux (15-150 keV) in 1 sec: 1.08568 ( -0.178796 0.17515 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.89058e-08 ( -1.71813e-08 1.69502e-08 ) ergs/cm2
Band function
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.82907 ( -4.82907 -4.82907 )
beta : -1.13619 ( -0.324039 0.315656 )
Epeak [keV] : 26.1973 ( -26.1973 12.058 )
Norm@50keV : 395.096 ( -61.9136 2.48062e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.04 using 59 PHA bins.
# Reduced chi-squared = 0.7644 for 55 degrees of freedom
# Null hypothesis probability = 9.003532e-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] : 21.1491 (-4.53329 6.39802)
R^2/D10^2 : 4.23577E-02 (-0.0238533 0.0500808)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.81 using 59 PHA bins.
# Reduced chi-squared = 0.9265 for 57 degrees of freedom
# Null hypothesis probability = 6.329697e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.568e-09 1.241e-09
25- 50 1.842e-08 5.962e-09
50-150 6.145e-08 2.001e-08
15-150 8.345e-08 2.324e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.46759 (-0.730245 0.730177)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.83 using 59 PHA bins.
# Reduced chi-squared = 0.8917 for 57 degrees of freedom
# Null hypothesis probability = 7.044411e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.112e-08 6.430e-09
25- 50 2.140e-08 1.218e-08
50-150 4.693e-08 2.592e-08
15-150 7.946e-08 4.548e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.17660 (-4.32415 6.23362)
R1^2/D10^2 : 0.413355 (-0.316007 0.601309)
kT2 [keV] : 47.5958 (-43.3898 -48.2786)
R2^2/D10^2 : 3.11519E-03 (-0.00275805 0.0201357)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.40 using 59 PHA bins.
# Reduced chi-squared = 0.7710 for 55 degrees of freedom
# Null hypothesis probability = 8.929725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.643e-09 4.423e-09
25- 50 2.071e-08 1.189e-08
50-150 7.257e-08 3.971e-08
15-150 1.009e-07 5.080e-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: 1.20021 ( -0.117535 0.116018 )
Norm@50keV : 4.24646E-03 ( -0.000282204 0.000282073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.78 using 59 PHA bins.
# Reduced chi-squared = 0.9259 for 57 degrees of freedom
# Null hypothesis probability = 6.341711e-01
Photon flux (15-150 keV) in 26.68 sec: 0.498462 ( -0.034544 0.0346173 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14936e-06 ( -8.29649e-08 8.3304e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.852937 ( -0.514045 0.396046 )
Epeak [keV] : 179.028 ( -76.3785 -179.028 )
Norm@50keV : 6.19041E-03 ( -0.002094 0.00443998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.15 using 59 PHA bins.
# Reduced chi-squared = 0.9133 for 56 degrees of freedom
# Null hypothesis probability = 6.588063e-01
Photon flux (15-150 keV) in 26.68 sec: 0.490739 ( -0.036062 0.036058 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12503e-06 ( -9.10962e-08 9.00957e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.75801E-03 ( -1.037 0.0999143 )
beta : -1.40097 ( 1.39789 0.214956 )
Epeak [keV] : 67.9342 ( -36.3031 105.684 )
Norm@50keV : 2.01845E-02 ( -0.0217032 36.6456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8898 for 55 degrees of freedom
# Null hypothesis probability = 7.040885e-01
Photon flux (15-150 keV) in 26.68 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) = 2.45e-07
S(50-100 keV) = 4.24e-07
T90 vs. Hardness ratio plot
T90 = 20.8640000224113 sec.
Hardness ratio (energy fluence ratio) = 1.73061
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.88182
Count Ratio (50-100 keV) / (15-25 keV) = 1.64053
Mask shadow pattern
IMX = 5.610522469974785E-01, IMY = -1.484031830978243E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.168000 -1.152000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6321 22.0205 0.3 26.8 -111.7 9.7701 36.1 0.4 Crab
151.6301 15.7103 3.0 39.0 93.5 3.2969 3.8 ------ UNKNOWN
136.2542 -4.7533 2.4 42.3 132.8 3.1514 4.7 ------ UNKNOWN
63.0856 34.3183 2.9 41.1 -81.3 3.2513 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.152000 25.532600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.4692 22.0534 5.0 27.0 -111.5 0.1726 2.3 9.4 Crab
165.2193 53.8765 2.8 44.3 32.6 0.6021 4.2 ------ UNKNOWN
186.5702 72.4871 2.5 56.3 10.5 1.7211 4.6 ------ UNKNOWN
134.3597 56.4213 0.5 30.1 14.8 1.7193 23.6 ------ UNKNOWN
58.1437 47.2529 2.6 44.1 -61.9 1.0531 4.4 ------ UNKNOWN
66.2024 23.6462 2.0 41.1 -98.1 1.4961 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
83.532600 962.878700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
223.2269 62.4581 3.8 42.0 43.0 4.9931 3.5 ------ UNKNOWN
222.6601 62.5138 3.8 41.7 43.2 5.6642 4.0 ------ UNKNOWN
1.5658 60.1642 3.3 57.6 -26.3 11.6113 3.5 ------ UNKNOWN
105.7168 6.0113 4.1 55.2 -145.3 10.9307 2.8 ------ UNKNOWN
Plot creation:
Sat May 30 22:16:36 EDT 2015