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
54.3070 -89.0292 0.0227 30.6493 -115.8824 0.3581574 8.502 TRIG_00519256
Foreground time interval of the image:
-2.960 5.328 (delta_t = 8.288 [sec])
Background time interval of the image:
-239.544 -2.960 (delta_t = 236.584 [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)
The mask-weighted light curves based on cleaned DPHs
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 -2.960 sec. to 5.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78539 ( -0.3044 0.323164 )
Norm@50keV : 2.72359E-03 ( -0.000566875 0.000550322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.17 using 59 PHA bins.
# Reduced chi-squared = 0.8275 for 57 degrees of freedom
# Null hypothesis probability = 8.203205e-01
Photon flux (15-150 keV) in 8.288 sec: 0.373201 ( -0.0667689 0.0667985 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07927e-07 ( -4.32647e-08 4.44146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.960 sec. to 5.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30320 ( -1.21354 0.788509 )
Epeak [keV] : 65.6204 ( -50.2363 -65.5337 )
Norm@50keV : 5.01920E-03 ( -0.00503311 0.0179079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.47 using 59 PHA bins.
# Reduced chi-squared = 0.8299 for 56 degrees of freedom
# Null hypothesis probability = 8.140274e-01
Photon flux (15-150 keV) in 8.288 sec: 0.367883 ( -0.067484 0.067573 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00303e-07 ( -4.51812e-08 4.69399e-08 ) ergs/cm2
Band function
Time interval is from -2.960 sec. to 5.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31872 ( -1.68667 1.18358 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 67.3169 ( -38.5211 -67.3146 )
Norm@50keV : 4.88981E-03 ( -0.00206653 0.0179859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8450 for 55 degrees of freedom
# Null hypothesis probability = 7.865043e-01
Photon flux (15-150 keV) in 8.288 sec: 0.368743 ( 6.63126 -0.065511 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99249e-07 ( -1.99191e-07 -4.34697e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0592 (-3.13422 4.01919)
R^2/D10^2 : 8.74363E-02 (-0.0557879 0.176046)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 57 degrees of freedom
# Null hypothesis probability = 4.848245e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.230e-08 8.429e-09
25- 50 7.058e-08 2.148e-08
50-150 6.192e-08 2.423e-08
15-150 1.548e-07 5.002e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 105.899 (-48.9606 -104.814)
Norm : 1.63145 (-0.328571 0.498016)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.49 using 59 PHA bins.
# Reduced chi-squared = 0.8156 for 57 degrees of freedom
# Null hypothesis probability = 8.385935e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.533e-08 1.002e-08
25- 50 6.179e-08 2.655e-08
50-150 1.034e-07 7.201e-08
15-150 2.005e-07 1.135e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29804 (-1.55265 2.15584)
R1^2/D10^2 : 1.32545 (-0.976315 4.23391)
kT2 [keV] : 21.4390 (-5.93462 11.2706)
R2^2/D10^2 : 8.54415E-03 (-0.0066552 0.0207933)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.62 using 59 PHA bins.
# Reduced chi-squared = 0.7931 for 55 degrees of freedom
# Null hypothesis probability = 8.655840e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.959e-08 2.209e-08
25- 50 5.689e-08 3.051e-08
50-150 1.102e-07 6.734e-08
15-150 2.067e-07 1.089e-07
Peak spectrum fit
Power-law model
Time interval is from 0.916 sec. to 1.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30185 ( -0.347462 0.343366 )
Norm@50keV : 7.93181E-03 ( -0.0016454 0.00164409 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9364 for 57 degrees of freedom
# Null hypothesis probability = 6.119647e-01
Photon flux (15-150 keV) in 1 sec: 0.946604 ( -0.20267 0.203494 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.83457e-08 ( -1.7553e-08 1.7729e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.916 sec. to 1.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.525822 ( -1.91716 0.972528 )
Epeak [keV] : 105.622 ( )
Norm@50keV : 1.81233E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9363 for 56 degrees of freedom
# Null hypothesis probability = 6.107376e-01
Photon flux (15-150 keV) in 1 sec: 0.920366 ( -0.210931 0.209424 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6219e-08 ( -1.80505e-08 1.8262e-08 ) ergs/cm2
Band function
Time interval is from 0.916 sec. to 1.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.606376 ( -0.77245 2.16199 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 110.994 ( -45.6669 606.347 )
Norm@50keV : 1.68348E-02 ( -0.01007 0.0993662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.44 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 55 degrees of freedom
# Null hypothesis probability = 5.729223e-01
Photon flux (15-150 keV) in 1 sec: 0.940273 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.63279e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.9824 (-4.00848 5.42462)
R^2/D10^2 : 5.24565E-02 (-0.0301878 0.0644236)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.08 using 59 PHA bins.
# Reduced chi-squared = 0.9664 for 57 degrees of freedom
# Null hypothesis probability = 5.473111e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.717e-09 1.779e-09
25- 50 1.786e-08 6.087e-09
50-150 4.730e-08 1.920e-08
15-150 6.888e-08 2.473e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.95838 (-0.827773 0.827708)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.47 using 59 PHA bins.
# Reduced chi-squared = 0.9556 for 57 degrees of freedom
# Null hypothesis probability = 5.705421e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.857e-09 5.745e-09
25- 50 1.896e-08 1.102e-08
50-150 4.159e-08 2.419e-08
15-150 7.041e-08 4.147e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.75573 (-2.17006 8.09549)
R1^2/D10^2 : 2.88201 (-2.80099 18.4756)
kT2 [keV] : 22.5424 (-5.6461 14.3598)
R2^2/D10^2 : 2.68374E-02 (-0.0229835 0.0453728)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 55 degrees of freedom
# Null hypothesis probability = 6.182343e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.207e-09 4.577e-09
25- 50 1.667e-08 9.060e-09
50-150 5.093e-08 2.978e-08
15-150 7.581e-08 4.033e-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: 1.78539 ( -0.3044 0.323164 )
Norm@50keV : 2.72359E-03 ( -0.000566875 0.000550322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.17 using 59 PHA bins.
# Reduced chi-squared = 0.8275 for 57 degrees of freedom
# Null hypothesis probability = 8.203205e-01
Photon flux (15-150 keV) in 8.288 sec: 0.373201 ( -0.0667689 0.0667985 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07927e-07 ( -4.32647e-08 4.44146e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30320 ( -1.21354 0.788509 )
Epeak [keV] : 65.6204 ( -50.2363 -65.5337 )
Norm@50keV : 5.01920E-03 ( -0.00503311 0.0179079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.47 using 59 PHA bins.
# Reduced chi-squared = 0.8299 for 56 degrees of freedom
# Null hypothesis probability = 8.140274e-01
Photon flux (15-150 keV) in 8.288 sec: 0.367883 ( -0.067484 0.067573 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00303e-07 ( -4.51812e-08 4.69399e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31872 ( -1.68667 1.18358 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 67.3169 ( -38.5211 -67.3146 )
Norm@50keV : 4.88981E-03 ( -0.00206653 0.0179859 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8450 for 55 degrees of freedom
# Null hypothesis probability = 7.865043e-01
Photon flux (15-150 keV) in 8.288 sec: 0.368743 ( 6.63126 -0.065511 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99249e-07 ( -1.99191e-07 -4.34697e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 5.82e-08
S(50-100 keV) = 6.76e-08
T90 vs. Hardness ratio plot
T90 = 7.28399991989136 sec.
Hardness ratio (energy fluence ratio) = 1.16151
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.805242
Count Ratio (50-100 keV) / (15-25 keV) = 0.737292
Mask shadow pattern
IMX = -2.586676173132431E-01, IMY = 5.331216493044129E-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:
-239.544000 -2.960000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5427 -40.5474 1.0 24.9 10.9 2.2412 11.7 0.8 Vela X-1
170.2062 -60.6001 26.2 4.6 168.2 -0.0773 -0.4 3.5 Cen X-3
186.6561 -62.7860 0.8 12.6 177.6 2.7218 15.2 0.9 GX 301-2
156.7784 -18.6250 3.0 41.1 55.9 2.0402 3.8 ------ UNKNOWN
179.6549 -68.7470 2.4 12.0 -151.1 0.7711 4.9 ------ UNKNOWN
80.9007 -41.4260 4.3 50.6 -44.7 2.4650 2.7 ------ UNKNOWN
81.6671 -39.1189 3.1 52.0 -42.2 3.3412 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.960000 5.328000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3861 -40.4508 11.6 25.0 10.7 -0.0291 -1.0 9.0 Vela X-1
169.9757 -60.7215 6.6 4.5 169.9 0.0460 1.7 11.6 Cen X-3
186.2994 -62.9017 0.0 12.4 178.2 -0.0332 -1.2 12.6 GX 301-2
210.9721 -33.3879 2.9 41.6 135.9 0.2961 4.0 ------ UNKNOWN
204.3173 -61.4376 2.3 20.9 175.9 0.1409 5.1 ------ UNKNOWN
54.3051 -89.0291 1.4 30.6 -115.9 0.3582 8.5 ------ UNKNOWN
286.4167 -68.8699 2.5 45.6 -142.1 0.2853 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Fri Jun 12 02:02:38 EDT 2015