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
48.4859 -42.9423 0.0043 21.5540 -57.2923 1.8327941 44.347 TRIG_00271019
Foreground time interval of the image:
-1.008 9.981 (delta_t = 10.989 [sec])
Background time interval of the image:
-113.419 -1.008 (delta_t = 112.411 [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 0.512000
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 0.512000
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 0.512000
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 -1.008 sec. to 171.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37558 ( -0.0883 0.088271 )
Norm@50keV : 1.56413E-03 ( -7.44954e-05 7.43979e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.94 using 59 PHA bins.
# Reduced chi-squared = 0.7709 for 57 degrees of freedom
# Null hypothesis probability = 8.975208e-01
Photon flux (15-150 keV) in 172.5 sec: 0.189453 ( -0.00928121 0.00930223 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62046e-06 ( -1.3935e-07 1.40077e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.008 sec. to 171.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25751 ( -0.336407 0.162712 )
Epeak [keV] : 330.143 ( -330.082 -330.082 )
Norm@50keV : 1.78293E-03 ( -0.000281593 0.000776671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.54 using 59 PHA bins.
# Reduced chi-squared = 0.7775 for 56 degrees of freedom
# Null hypothesis probability = 8.875840e-01
Photon flux (15-150 keV) in 172.5 sec: 0.188110 ( -0.009909 0.009908 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.597e-06 ( -1.54922e-07 1.54008e-07 ) ergs/cm2
Band function
Time interval is from -1.008 sec. to 171.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.79385E-02 ( -1.61375 -1.61375 )
beta : -1.41088 ( 1.40954 0.114004 )
Epeak [keV] : 40.1401 ( -40.1512 243.381 )
Norm@50keV : 1.30660E-02 ( -0.0129929 96049.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.22 using 59 PHA bins.
# Reduced chi-squared = 0.7858 for 55 degrees of freedom
# Null hypothesis probability = 8.749994e-01
Photon flux (15-150 keV) in 172.5 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] : 17.0132 ( )
R^2/D10^2 : 1.38651E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 146.05 using 59 PHA bins.
# Reduced chi-squared = 2.5622 for 57 degrees of freedom
# Null hypothesis probability = 9.397448e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.410e-07 1.369e-08
25- 50 6.241e-07 3.959e-08
50-150 1.290e-06 1.264e-07
15-150 2.055e-06 1.207e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.782037 (-0.037121 0.0371164)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.20 using 59 PHA bins.
# Reduced chi-squared = 0.9860 for 57 degrees of freedom
# Null hypothesis probability = 5.049095e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.360e-07 1.889e-08
25- 50 6.463e-07 3.631e-08
50-150 1.418e-06 1.030e-07
15-150 2.400e-06 1.294e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.95907 (-1.03016 1.15764)
R1^2/D10^2 : 0.185750 (-0.0753762 0.143139)
kT2 [keV] : 28.6550 (-3.85467 5.64285)
R2^2/D10^2 : 2.01951E-03 (-0.000903783 0.00130505)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.31 using 59 PHA bins.
# Reduced chi-squared = 0.7328 for 55 degrees of freedom
# Null hypothesis probability = 9.311906e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.938e-07 5.649e-08
25- 50 6.138e-07 8.677e-08
50-150 1.696e-06 3.587e-07
15-150 2.604e-06 3.717e-07
Peak spectrum fit
Power-law model
Time interval is from 1.212 sec. to 2.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32538 ( -0.157659 0.158419 )
Norm@50keV : 1.33950E-02 ( -0.00126467 0.00126086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.72 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.252440e-01
Photon flux (15-150 keV) in 1 sec: 1.60577 ( -0.150219 0.150298 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31566e-07 ( -1.40458e-08 1.41863e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.212 sec. to 2.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.806380 ( -0.682047 0.575781 )
Epeak [keV] : 118.368 ( -41.4935 -118.368 )
Norm@50keV : 2.42270E-02 ( -0.0113239 0.0271302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.49 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 56 degrees of freedom
# Null hypothesis probability = 2.566618e-01
Photon flux (15-150 keV) in 1 sec: 1.57459 ( -0.15461 0.15445 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27076e-07 ( -1.5092e-08 1.5169e-08 ) ergs/cm2
Band function
Time interval is from 1.212 sec. to 2.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.806701 ( -0.445623 0.668321 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 118.400 ( -41.5049 -118.401 )
Norm@50keV : 2.42163E-02 ( -0.0113161 0.0271503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.49 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.274783e-01
Photon flux (15-150 keV) in 1 sec: 1.58501 ( ) 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] : 16.9384 (-1.96988 2.25422)
R^2/D10^2 : 0.126414 (-0.0434151 0.0652543)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.10 using 59 PHA bins.
# Reduced chi-squared = 1.458 for 57 degrees of freedom
# Null hypothesis probability = 1.363640e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.394e-09 1.302e-09
25- 50 3.262e-08 4.180e-09
50-150 6.675e-08 1.188e-08
15-150 1.068e-07 1.332e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.54960 (-0.615516 0.615518)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.48 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 57 degrees of freedom
# Null hypothesis probability = 1.419333e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.641e-08 3.270e-09
25- 50 3.156e-08 1.274e-08
50-150 6.923e-08 3.727e-08
15-150 1.172e-07 3.574e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50028 (-1.95495 2.64801)
R1^2/D10^2 : 1.69913 (-1.12491 4.55261)
kT2 [keV] : 24.8642 (-4.8039 9.11231)
R2^2/D10^2 : 2.91513E-02 (-0.0195199 0.0266861)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.696843e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.375e-08 6.668e-09
25- 50 3.030e-08 1.019e-08
50-150 8.307e-08 3.885e-08
15-150 1.271e-07 4.843e-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: 1.34269 ( -0.0706237 0.0705854 )
Norm@50keV : 9.86643E-03 ( -0.00038643 0.000386306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.78 using 59 PHA bins.
# Reduced chi-squared = 0.9085 for 57 degrees of freedom
# Null hypothesis probability = 6.705166e-01
Photon flux (15-150 keV) in 10.99 sec: 1.18685 ( -0.0479799 0.0480413 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06078e-06 ( -4.61939e-08 4.63732e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.964772 ( -0.292481 0.274171 )
Epeak [keV] : 144.604 ( -41.2489 217.76 )
Norm@50keV : 1.49646E-02 ( -0.00381012 0.00550353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.10 using 59 PHA bins.
# Reduced chi-squared = 0.8232 for 56 degrees of freedom
# Null hypothesis probability = 8.246823e-01
Photon flux (15-150 keV) in 10.99 sec: 1.16216 ( -0.05098 0.051 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03173e-06 ( -5.13211e-08 5.1165e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.964758 ( -0.207237 0.359294 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 144.581 ( -25.7665 217.644 )
Norm@50keV : 1.49636E-02 ( -0.00381044 0.00550447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.10 using 59 PHA bins.
# Reduced chi-squared = 0.8381 for 55 degrees of freedom
# Null hypothesis probability = 7.981485e-01
Photon flux (15-150 keV) in 10.99 sec: 1.16318 ( ) 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) = 6.08e-07
S(50-100 keV) = 9.37e-07
T90 vs. Hardness ratio plot
T90 = 130.368000030518 sec.
Hardness ratio (energy fluence ratio) = 1.54112
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.50983
Count Ratio (50-100 keV) / (15-25 keV) = 1.17971
Mask shadow pattern
IMX = 2.134392873802190E-01, IMY = 3.323675962069452E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-113.419380 -1.008000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3156 -60.7611 8.7 44.6 130.4 0.6340 1.3 8.3 Cen X-3
186.2891 -62.7078 5.6 48.3 139.9 1.0123 2.0 10.8 GX 301-2
75.1735 -39.8467 2.3 19.5 2.3 0.5000 4.9 ------ UNKNOWN
66.2951 -5.3186 2.3 54.1 -12.6 1.4965 5.1 ------ UNKNOWN
285.8080 -58.6388 2.7 59.1 -166.2 2.9200 4.3 ------ UNKNOWN
320.8343 -53.8954 5.2 54.0 -143.2 1.3839 2.2 ------ UNKNOWN
41.9337 -13.4994 3.1 50.7 -44.5 2.0728 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.008000 9.980600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3036 -60.6292 53.7 44.7 130.2 -0.0350 -0.2 0.5 Cen X-3
186.6820 -62.8931 10.5 48.3 140.2 -0.1811 -1.1 7.4 GX 301-2
113.7662 -63.5245 2.3 20.3 113.9 0.2189 5.1 ------ UNKNOWN
238.0174 -66.2490 2.6 54.1 167.1 0.7638 4.5 ------ UNKNOWN
79.4073 -25.3595 2.3 34.3 6.6 0.2355 5.0 ------ UNKNOWN
48.4859 -42.9423 0.3 21.6 -57.3 1.8327 44.4 ------ UNKNOWN
297.6359 -55.8728 1.9 59.2 -158.1 1.4249 6.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
52.780600 962.163000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
312.7394 -54.8767 3.8 59.0 -166.2 9.6607 3.1 ------ UNKNOWN
44.1302 2.4307 3.0 45.6 -34.3 3.0425 3.8 ------ UNKNOWN
44.4027 11.4008 5.1 54.5 -33.1 5.4171 2.3 ------ UNKNOWN
35.8270 6.3838 3.1 50.7 -44.5 9.5670 3.7 ------ UNKNOWN
Plot creation:
Sun May 31 10:42:56 EDT 2015