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
219.2851 27.7949 0.0110 51.8737 -6.3870 3.3835223 17.499 TRIG_00148646
Foreground time interval of the image:
-3.408 30.064 (delta_t = 33.472 [sec])
Background time interval of the image:
-71.019 -3.408 (delta_t = 67.611 [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)
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 -3.408 sec. to 30.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48168 ( -0.138371 0.138809 )
Norm@50keV : 6.93346E-03 ( -0.000551449 0.000550851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.04 using 59 PHA bins.
# Reduced chi-squared = 0.9305 for 57 degrees of freedom
# Null hypothesis probability = 6.243914e-01
Photon flux (15-150 keV) in 33.47 sec: 0.861370 ( -0.0726311 0.0728737 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20823e-06 ( -1.86914e-07 1.87509e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.408 sec. to 30.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24892 ( -0.57413 0.306486 )
Epeak [keV] : 175.560 ( -175.56 -175.56 )
Norm@50keV : 8.93286E-03 ( -0.00246299 0.00742333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9368 for 56 degrees of freedom
# Null hypothesis probability = 6.095882e-01
Photon flux (15-150 keV) in 33.47 sec: 0.851773 ( -0.075546 0.075725 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18607e-06 ( -1.96124e-07 1.94909e-07 ) ergs/cm2
Band function
Time interval is from -3.408 sec. to 30.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24982 ( 1.15027 1.15027 )
beta : -9.32259 ( 9.3705 19.3462 )
Epeak [keV] : 176.103 ( -82.6453 -176.103 )
Norm@50keV : 8.92290E-03 ( -0.00172991 0.00589558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9539 for 55 degrees of freedom
# Null hypothesis probability = 5.721903e-01
Photon flux (15-150 keV) in 33.47 sec: 0.847105 ( ) 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] : 16.8036 (-1.65607 1.86847)
R^2/D10^2 : 6.60018E-02 (-0.0205002 0.0291518)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.85 using 59 PHA bins.
# Reduced chi-squared = 1.576 for 57 degrees of freedom
# Null hypothesis probability = 3.586098e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.274e-07 2.010e-08
25- 50 5.586e-07 6.125e-08
50-150 1.122e-06 1.600e-07
15-150 1.808e-06 1.777e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.55941 (-0.282162 0.282148)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.90 using 59 PHA bins.
# Reduced chi-squared = 0.9455 for 57 degrees of freedom
# Null hypothesis probability = 5.922735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.967e-07 2.915e-08
25- 50 5.707e-07 5.974e-08
50-150 1.252e-06 3.411e-07
15-150 2.119e-06 5.797e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.02489 (-1.94633 2.42895)
R1^2/D10^2 : 0.852081 (-0.529153 1.6173)
kT2 [keV] : 27.3046 (-5.59447 11.6526)
R2^2/D10^2 : 9.87961E-03 (-0.00700854 0.0091548)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.16 using 59 PHA bins.
# Reduced chi-squared = 0.9666 for 55 degrees of freedom
# Null hypothesis probability = 5.450927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.677e-07 1.146e-07
25- 50 5.544e-07 1.808e-07
50-150 1.364e-06 5.584e-07
15-150 2.186e-06 8.004e-07
Peak spectrum fit
Power-law model
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29340 ( -0.253933 0.248764 )
Norm@50keV : 2.23271E-02 ( -0.00342025 0.00341355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.71 using 59 PHA bins.
# Reduced chi-squared = 0.9072 for 57 degrees of freedom
# Null hypothesis probability = 6.731106e-01
Photon flux (15-150 keV) in 1 sec: 2.66048 ( -0.431069 0.433857 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2099e-07 ( -3.5362e-08 3.55183e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.456570 ( -1.48867 0.946067 )
Epeak [keV] : 99.7088 ( -31.7206 -99.7204 )
Norm@50keV : 5.57007E-02 ( -0.0354096 0.21502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.10 using 59 PHA bins.
# Reduced chi-squared = 0.8946 for 56 degrees of freedom
# Null hypothesis probability = 6.967713e-01
Photon flux (15-150 keV) in 1 sec: 2.58637 ( -0.44185 0.44443 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12999e-07 ( -3.913e-08 3.7972e-08 ) ergs/cm2
Band function
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88301 ( -14.1847 -4.88301 )
beta : -1.54018 ( -0.505731 0.329658 )
Epeak [keV] : 34.5383 ( -14.5081 10.1445 )
Norm@50keV : 253.854 ( -38.1842 7538.33 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.46 using 59 PHA bins.
# Reduced chi-squared = 0.8810 for 55 degrees of freedom
# Null hypothesis probability = 7.211118e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.146e-07 ( -2.14593e-07 -3.65e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.4336 (-2.82744 3.54388)
R^2/D10^2 : 0.196493 (-0.0932321 0.16491)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.38 using 59 PHA bins.
# Reduced chi-squared = 0.9540 for 57 degrees of freedom
# Null hypothesis probability = 5.740524e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.208e-08 3.434e-09
25- 50 5.450e-08 1.391e-08
50-150 1.192e-07 3.504e-08
15-150 1.858e-07 3.640e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 11.2996 (-1.74099 1.74068)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9462 for 57 degrees of freedom
# Null hypothesis probability = 5.908046e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.814e-08 1.620e-08
25- 50 5.413e-08 3.069e-08
50-150 1.187e-07 6.685e-08
15-150 2.010e-07 1.130e-07
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.38 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.61 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.40 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.37 using 59 PHA bins.
# Reduced chi-squared = 0.9887 for 55 degrees of freedom
# Reduced chi-squared = 0.8656 for 55 degrees of freedom
# Reduced chi-squared = 0.8617 for 55 degrees of freedom
# Reduced chi-squared = 0.8614 for 55 degrees of freedom
# Null hypothesis probability = 4.983415e-01
# Null hypothesis probability = 7.501559e-01
# Null hypothesis probability = 7.571379e-01
# Null hypothesis probability = 7.578065e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 1.48168 ( -0.138371 0.138809 )
Norm@50keV : 6.93346E-03 ( -0.000551449 0.000550851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.04 using 59 PHA bins.
# Reduced chi-squared = 0.9305 for 57 degrees of freedom
# Null hypothesis probability = 6.243914e-01
Photon flux (15-150 keV) in 33.47 sec: 0.861370 ( -0.0726311 0.0728737 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20823e-06 ( -1.86914e-07 1.87509e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24892 ( -0.57413 0.306486 )
Epeak [keV] : 175.560 ( -175.56 -175.56 )
Norm@50keV : 8.93286E-03 ( -0.00246299 0.00742333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9368 for 56 degrees of freedom
# Null hypothesis probability = 6.095882e-01
Photon flux (15-150 keV) in 33.47 sec: 0.851773 ( -0.075546 0.075725 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18607e-06 ( -1.96124e-07 1.94909e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24982 ( 1.15027 1.15027 )
beta : -9.32259 ( 9.3705 19.3462 )
Epeak [keV] : 176.103 ( -82.6457 -176.103 )
Norm@50keV : 8.92290E-03 ( -0.00172991 0.00589558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9539 for 55 degrees of freedom
# Null hypothesis probability = 5.721903e-01
Photon flux (15-150 keV) in 33.47 sec: 0.847105 ( ) 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) = 5.41e-07
S(50-100 keV) = 7.75e-07
T90 vs. Hardness ratio plot
T90 = 27.4560000300407 sec.
Hardness ratio (energy fluence ratio) = 1.43253
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.46612
Count Ratio (50-100 keV) / (15-25 keV) = 1.33971
Mask shadow pattern
IMX = 1.266233766103257E+00, IMY = 1.417400962895539E-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:
-71.019400 -3.408000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2701 -60.5353 5.1 45.2 179.2 0.4124 2.3 5.4 Cen X-3
186.6183 -62.6773 3.3 42.4 168.3 0.6467 3.5 5.7 GX 301-2
244.9854 -15.6433 1.8 39.1 64.5 2.1767 6.7 0.4 Sco X-1
220.8005 -72.4364 2.8 51.3 150.1 2.1056 4.1 ------ UNKNOWN
226.1013 27.4431 2.4 53.8 0.8 1.7199 4.8 ------ UNKNOWN
165.0318 -60.3300 2.8 47.1 -178.3 0.7560 4.1 ------ UNKNOWN
146.8285 -46.3098 2.1 51.9 -155.9 1.5466 5.4 ------ UNKNOWN
186.1361 25.6857 2.8 50.7 -44.6 2.1001 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.408000 30.064000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
169.9685 -60.6345 6.2 45.4 179.3 0.2732 1.9 10.2 Cen X-3
186.8988 -62.6651 4.2 42.3 168.1 -0.3983 -2.7 9.2 GX 301-2
244.9307 -15.7551 5.5 39.0 64.6 0.5506 2.1 7.4 Sco X-1
242.5938 15.5564 2.4 53.2 25.0 2.1717 4.8 ------ UNKNOWN
219.2851 27.7949 0.7 51.9 -6.4 3.3834 17.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
272.780600 302.090000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5192 35.2774 15.7 30.8 52.7 0.0568 0.7 4.9 Her X-1
252.6389 9.0290 2.8 36.6 100.1 0.5515 4.1 ------ UNKNOWN
276.4918 62.8671 2.4 50.7 15.4 0.7449 4.7 ------ UNKNOWN
223.0159 41.8977 2.1 14.4 -3.1 0.2730 5.5 ------ UNKNOWN
Plot creation:
Sun May 31 16:09:48 EDT 2015