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
335.0257 -63.4422 0.0038 39.4005 -25.0701 3.7955244 50.609 TRIG_00296805
Foreground time interval of the image:
-0.440 13.884 (delta_t = 14.324 [sec])
Background time interval of the image:
-239.280 -0.440 (delta_t = 238.840 [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 -0.440 sec. to 13.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51625 ( -0.0545142 0.0545532 )
Norm@50keV : 1.82115E-02 ( -0.000542311 0.000542269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9375 for 57 degrees of freedom
# Null hypothesis probability = 6.095474e-01
Photon flux (15-150 keV) in 14.32 sec: 2.28358 ( -0.0745553 0.0747673 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46754e-06 ( -7.73611e-08 7.74653e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.440 sec. to 13.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19556 ( -0.225837 0.21488 )
Epeak [keV] : 136.625 ( -35.0036 153.342 )
Norm@50keV : 2.56521E-02 ( -0.00513402 0.0067933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8355 for 56 degrees of freedom
# Null hypothesis probability = 8.048790e-01
Photon flux (15-150 keV) in 14.32 sec: 2.23493 ( -0.08049 0.08077 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42055e-06 ( -8.45596e-08 8.40727e-08 ) ergs/cm2
Band function
Time interval is from -0.440 sec. to 13.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.199033 ( -1.40009 4.19274 )
beta : -1.61033 ( 1.61037 0.085932 )
Epeak [keV] : 47.4262 ( -20.3084 160.911 )
Norm@50keV : 0.117131 ( -0.113051 245.323 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.82 using 59 PHA bins.
# Reduced chi-squared = 0.8330 for 55 degrees of freedom
# Null hypothesis probability = 8.065416e-01
Photon flux (15-150 keV) in 14.32 sec: 2.23864 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4171e-06 ( -2.417e-06 -8.39725e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.4893 ( )
R^2/D10^2 : 0.180763 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 269.65 using 59 PHA bins.
# Reduced chi-squared = 4.7308 for 57 degrees of freedom
# Null hypothesis probability = 2.257754e-29
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.445e-07 8.420e-09
25- 50 6.236e-07 2.821e-08
50-150 1.198e-06 6.859e-08
15-150 1.966e-06 6.730e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.35796 (-0.278216 0.278213)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.8919 for 57 degrees of freedom
# Null hypothesis probability = 7.041455e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.337e-07 1.024e-08
25- 50 6.420e-07 2.012e-08
50-150 1.408e-06 4.590e-08
15-150 2.384e-06 8.091e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.65775 (-0.826108 0.8901)
R1^2/D10^2 : 1.67214 (-0.50253 0.794715)
kT2 [keV] : 27.8510 (-2.8167 3.81052)
R2^2/D10^2 : 2.28162E-02 (-0.00845714 0.0111601)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.05 using 59 PHA bins.
# Reduced chi-squared = 0.8554 for 55 degrees of freedom
# Null hypothesis probability = 7.685385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.868e-07 2.878e-08
25- 50 6.451e-07 4.797e-08
50-150 1.482e-06 1.370e-07
15-150 2.414e-06 1.554e-07
Peak spectrum fit
Power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00389 ( -0.0525137 0.0520721 )
Norm@50keV : 9.77956E-02 ( -0.00321003 0.00320571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.33 using 59 PHA bins.
# Reduced chi-squared = 1.444 for 57 degrees of freedom
# Null hypothesis probability = 1.573321e-02
Photon flux (15-150 keV) in 1 sec: 11.2576 ( -0.372961 0.380842 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05612e-06 ( -3.58867e-08 3.57984e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.313758 ( -0.242363 0.229815 )
Epeak [keV] : 143.397 ( -22.6061 41.657 )
Norm@50keV : 0.197149 ( -0.0399291 0.0527351 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.38 using 59 PHA bins.
# Reduced chi-squared = 0.9532 for 56 degrees of freedom
# Null hypothesis probability = 5.746726e-01
Photon flux (15-150 keV) in 1 sec: 11.0734 ( -0.3815 0.3819 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03948e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.75368 ( -3.91379 -3.69548 )
beta : -1.22029 ( -0.141094 0.0844745 )
Epeak [keV] : 50.6718 ( -9.44726 62.7264 )
Norm@50keV : 4.08621 ( -4.18215 333.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.23 using 59 PHA bins.
# Reduced chi-squared = 0.8405 for 55 degrees of freedom
# Null hypothesis probability = 7.941999e-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] : 22.0145 ( )
R^2/D10^2 : 0.418553 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 151.80 using 59 PHA bins.
# Reduced chi-squared = 2.6632 for 57 degrees of freedom
# Null hypothesis probability = 1.498194e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.753e-08 2.395e-09
25- 50 1.985e-07 9.100e-09
50-150 7.189e-07 3.590e-08
15-150 9.549e-07 3.410e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 46.1662 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 364.93 using 59 PHA bins.
# Reduced chi-squared = 6.4023 for 57 degrees of freedom
# Null hypothesis probability = 1.780928e-46
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.150e-07 3.650e-09
25- 50 2.211e-07 8.700e-09
50-150 4.850e-07 1.630e-08
15-150 8.211e-07 2.935e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.7679 (-1.9029 2.06755)
R1^2/D10^2 : 1.69958 (-0.504437 0.857131)
kT2 [keV] : 40.3204 (-7.53141 17.5804)
R2^2/D10^2 : 4.64198E-02 (-0.0306241 0.047837)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.64 using 59 PHA bins.
# Reduced chi-squared = 0.8481 for 55 degrees of freedom
# Null hypothesis probability = 7.813295e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.937e-08 7.130e-09
25- 50 2.190e-07 2.460e-08
50-150 7.645e-07 1.994e-07
15-150 1.043e-06 2.033e-07
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: 1.51625 ( -0.0545142 0.0545532 )
Norm@50keV : 1.82115E-02 ( -0.000542311 0.000542269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9375 for 57 degrees of freedom
# Null hypothesis probability = 6.095474e-01
Photon flux (15-150 keV) in 14.32 sec: 2.28358 ( -0.0745553 0.0747673 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46754e-06 ( -7.73611e-08 7.74653e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19556 ( -0.225837 0.21488 )
Epeak [keV] : 136.625 ( -35.0036 153.342 )
Norm@50keV : 2.56521E-02 ( -0.00513402 0.0067933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8355 for 56 degrees of freedom
# Null hypothesis probability = 8.048790e-01
Photon flux (15-150 keV) in 14.32 sec: 2.23493 ( -0.08049 0.08077 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42055e-06 ( -8.45596e-08 8.40727e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.212077 ( -1.38933 4.19975 )
beta : -1.61040 ( 1.61041 0.0859037 )
Epeak [keV] : 47.6506 ( -20.4769 164.007 )
Norm@50keV : 0.114744 ( -0.111608 240.594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.81 using 59 PHA bins.
# Reduced chi-squared = 0.8330 for 55 degrees of freedom
# Null hypothesis probability = 8.065993e-01
Photon flux (15-150 keV) in 14.32 sec: 2.23864 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4171e-06 ( -2.417e-06 -8.39725e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.15e-07
S(50-100 keV) = 8.60e-07
T90 vs. Hardness ratio plot
T90 = 6.07600000500679 sec.
Hardness ratio (energy fluence ratio) = 1.39837
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.5087
Count Ratio (50-100 keV) / (15-25 keV) = 1.22749
Mask shadow pattern
IMX = 7.440379484351372E-01, IMY = 3.480602275669307E-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:
-239.280000 -0.440000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4995 -40.6230 2.2 38.1 -176.9 1.2666 5.4 4.3 Vela X-1
170.2461 -60.6372 2.3 34.1 -126.7 1.3145 4.9 2.2 Cen X-3
186.8072 -62.6123 25.5 37.5 -114.1 0.1868 0.4 10.3 GX 301-2
87.5473 -31.9592 3.0 36.4 116.1 1.5208 3.9 ------ UNKNOWN
331.0136 -45.3677 3.5 56.5 -16.4 2.3164 3.3 ------ UNKNOWN
171.2657 -35.9414 3.1 55.3 -145.3 4.3966 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.440000 13.884000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6171 -40.5410 4.8 38.2 -176.8 0.1545 2.4 4.1 Vela X-1
170.3675 -60.7549 7.2 34.1 -126.5 -0.1180 -1.6 8.1 Cen X-3
186.3199 -62.7068 6.2 37.3 -114.3 -0.1933 -1.9 10.0 GX 301-2
75.7058 -50.7477 3.0 18.3 92.8 0.2236 3.9 ------ UNKNOWN
335.0257 -63.4422 0.2 39.4 -25.1 3.7955 50.6 ------ UNKNOWN
300.2007 -61.0299 2.2 48.3 -44.8 0.9663 5.3 ------ UNKNOWN
262.1498 -69.1993 3.5 42.4 -68.2 0.6213 3.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
484.720580 951.420600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
210.2271 47.4559 2.7 55.6 177.2 5.2219 4.3 ------ UNKNOWN
169.5098 -31.1279 2.9 31.7 -15.6 1.1762 4.0 ------ UNKNOWN
161.6884 -41.7601 2.8 43.8 -11.7 1.7351 4.1 ------ UNKNOWN
212.7500 33.2307 3.0 47.1 -168.0 2.0058 3.9 ------ UNKNOWN
190.0953 -49.9774 3.6 50.7 -39.2 3.7844 3.3 ------ UNKNOWN
Plot creation:
Sun May 31 08:40:24 EDT 2015