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
265.3009 34.9446 0.0213 20.8696 142.0257 0.0301620 9.022 TRIG_00162580
Foreground time interval of the image:
-0.004 0.064 (delta_t = 0.068 [sec])
Background time interval of the image:
-299.360 -0.004 (delta_t = 299.356 [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 0.032000
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 0.032000
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 0.032000
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 -0.004 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20996 ( -0.354765 0.341635 )
Norm@50keV : 2.43073E-02 ( -0.00502439 0.00502436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.19 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.132764e-01
Photon flux (15-150 keV) in 0.068 sec: 2.85723 ( -0.605865 0.607282 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67226e-08 ( -3.78247e-09 3.82522e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.925260 ( )
Epeak [keV] : 196.286 ( )
Norm@50keV : 3.37185E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.06 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.905073e-01
Photon flux (15-150 keV) in 0.068 sec: 2.83791 ( -0.61386 0.61357 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6451e-08 ( -4.1582e-09 4.00228e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.247108 ( -0.0459161 -0.0459161 )
beta : -1.46225 ( 1.4589 0.550446 )
Epeak [keV] : 60.3948 ( -60.4504 143.356 )
Norm@50keV : 0.171305 ( -0.180246 544.387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.45 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Null hypothesis probability = 1.795596e-01
Photon flux (15-150 keV) in 0.068 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] : 16.9249 (-3.94178 6.15354)
R^2/D10^2 : 0.232055 (-0.150326 0.339118)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.51 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 57 degrees of freedom
# Null hypothesis probability = 1.235837e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.217e-10 3.736e-10
25- 50 4.064e-09 1.598e-09
50-150 8.299e-09 3.331e-09
15-150 1.328e-08 4.918e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 11.8181 (-2.49264 2.49251)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.65 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.579889e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.001e-09 1.186e-09
25- 50 3.849e-09 2.279e-09
50-150 8.442e-09 4.896e-09
15-150 1.429e-08 8.299e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.5436 (-5.40976 5.21788)
R1^2/D10^2 : 0.813105 (-0.511307 3.85522)
kT2 [keV] : 50.8791 (-40.2435 -69.923)
R2^2/D10^2 : 5.03314E-03 (-0.00219361 0.0870182)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.01 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.897463e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.367e-09 8.371e-10
25- 50 4.094e-09 2.323e-09
50-150 1.067e-08 5.851e-09
15-150 1.613e-08 8.010e-09
Peak spectrum fit
Power-law model
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.928029 ( -0.780344 0.659869 )
Norm@50keV : 2.70021E-03 ( -0.00106364 0.00100107 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8776 for 57 degrees of freedom
# Null hypothesis probability = 7.320126e-01
Photon flux (15-150 keV) in 1 sec: 0.310044 ( -0.116522 0.118399 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.998e-08 ( -1.13215e-08 1.14971e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.922785 ( -1.10877 0.664595 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 2.71526E-03 ( -0.000968263 0.0436625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8933 for 56 degrees of freedom
# Null hypothesis probability = 6.993209e-01
Photon flux (15-150 keV) in 1 sec: 0.309978 ( -0.060692 0.117699 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99858e-08 ( -2.99858e-08 1.14792e-08 ) ergs/cm2
Band function
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.863468 ( 0.862176 0.862176 )
beta : -0.938599 ( -0.659692 0.779867 )
Epeak [keV] : 13.3739 ( -13.3625 -13.3625 )
Norm@50keV : 4.07196E-03 ( -0.00240414 111613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.03 using 59 PHA bins.
# Reduced chi-squared = 0.9096 for 55 degrees of freedom
# Null hypothesis probability = 6.646509e-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] : 26.2124 (-11.7696 31.9763)
R^2/D10^2 : 6.44663E-03 (-0.00643473 0.0353078)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.66 using 59 PHA bins.
# Reduced chi-squared = 0.9064 for 57 degrees of freedom
# Null hypothesis probability = 6.748269e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.500e-10 5.035e-10
25- 50 4.356e-09 2.804e-09
50-150 2.201e-08 1.411e-08
15-150 2.712e-08 1.698e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-112.699 -199.363)
Norm : 1.28529 (-0.488081 0.488102)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.56 using 59 PHA bins.
# Reduced chi-squared = 0.9220 for 57 degrees of freedom
# Null hypothesis probability = 6.423440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.200e-09 2.081e-09
25- 50 6.157e-09 4.031e-09
50-150 1.350e-08 8.430e-09
15-150 2.286e-08 1.416e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.98418 (-8.96475 -8.96475)
R1^2/D10^2 : 0.111586 (-0.111669 -0.111669)
kT2 [keV] : 46.0556 (-46.0123 -46.0123)
R2^2/D10^2 : 1.10991E-03 (-0.00111311 0.0149052)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.65 using 59 PHA bins.
# Reduced chi-squared = 0.9027 for 55 degrees of freedom
# Null hypothesis probability = 6.785822e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.026e-09 1.434e-09
25- 50 5.654e-09 3.770e-09
50-150 2.321e-08 1.346e-08
15-150 3.089e-08 1.742e-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: 1.20996 ( -0.354765 0.341635 )
Norm@50keV : 2.43073E-02 ( -0.00502439 0.00502436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.19 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.132764e-01
Photon flux (15-150 keV) in 0.068 sec: 2.85723 ( -0.605865 0.607282 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67226e-08 ( -3.78247e-09 3.82522e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.925260 ( )
Epeak [keV] : 196.286 ( )
Norm@50keV : 3.37185E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.06 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.905073e-01
Photon flux (15-150 keV) in 0.068 sec: 2.83791 ( -0.61386 0.61357 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6451e-08 ( -4.1582e-09 4.00228e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.247108 ( -0.0459161 -0.0459161 )
beta : -1.46225 ( 1.4589 0.550446 )
Epeak [keV] : 60.3948 ( -60.4504 148.84 )
Norm@50keV : 0.171305 ( -0.180246 544.387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.45 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Null hypothesis probability = 1.795596e-01
Photon flux (15-150 keV) in 0.068 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) = 3.53e-09
S(50-100 keV) = 6.11e-09
T90 vs. Hardness ratio plot
T90 = 0.0559999942779541 sec.
Hardness ratio (energy fluence ratio) = 1.73088
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.68011
Count Ratio (50-100 keV) / (15-25 keV) = 1.70575
Mask shadow pattern
IMX = -3.005377951979895E-01, IMY = -2.345888052357080E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
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:
-299.360000 -0.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3828 35.3252 3.5 11.9 143.6 0.5479 3.2 3.8 Her X-1
268.3661 -1.4529 65.7 45.3 -163.2 0.0589 0.2 0.1 SW J1753.5-0127
273.8279 -14.0504 8.1 58.8 -160.3 -2.2660 -1.5 10.4 GX 17+2
288.7060 10.9026 6.7 50.5 165.4 1.0353 1.7 6.0 GRS 1915+105
291.4924 48.4926 2.3 40.0 113.2 2.9833 5.0 ------ UNKNOWN
275.4886 7.1684 3.3 43.0 -179.0 0.9642 3.5 ------ UNKNOWN
170.0080 41.1489 2.3 53.8 -2.0 2.8132 4.9 ------ UNKNOWN
169.6743 30.8525 2.8 57.7 -13.5 3.9534 4.2 ------ UNKNOWN
278.3402 -11.2219 2.9 58.9 -166.4 4.9512 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.004000 0.064000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2270 35.3190 220.0 11.8 143.7 -0.0002 -0.1 11.4 Her X-1
268.2954 -1.4989 80.1 45.3 -163.1 -0.0008 -0.1 5.2 SW J1753.5-0127
274.0869 -13.9735 3.9 58.8 -160.6 -0.0472 -2.9 6.0 GX 17+2
288.8114 11.0283 6.8 50.5 165.2 0.0163 1.7 5.0 GRS 1915+105
294.7839 35.9737 2.6 44.2 131.2 0.0633 4.5 ------ UNKNOWN
265.3008 34.9446 1.3 20.9 142.0 0.0302 9.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
51.340600 302.670500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5274 35.3195 4.7 8.8 -42.1 0.4473 2.5 3.7 Her X-1
268.2828 -1.4155 3.4 36.4 -142.9 0.8368 3.3 5.6 SW J1753.5-0127
274.2169 -14.0513 3.7 49.7 -149.3 1.4434 3.1 12.3 GX 17+2
288.8293 11.0624 4.2 32.1 174.5 0.6698 2.8 7.2 GRS 1915+105
299.6019 35.2112 0.3 28.0 121.5 10.6112 38.8 0.8 Cyg X-1
308.1328 40.9915 4.0 34.0 108.9 1.1806 2.9 2.5 Cyg X-3
283.6475 2.8256 2.1 36.4 -169.9 1.2408 5.6 ------ UNKNOWN
272.3040 14.5154 2.6 21.4 -156.8 0.8507 4.4 ------ UNKNOWN
290.7837 -18.8494 3.1 59.0 -166.2 4.2859 3.7 ------ UNKNOWN
238.2056 21.7420 3.3 27.1 -69.7 0.7372 3.5 ------ UNKNOWN
271.7598 -19.9469 4.8 55.2 -145.3 3.4386 2.5 ------ UNKNOWN
257.2296 -11.6180 2.8 47.2 -127.1 3.1377 4.1 ------ UNKNOWN
232.7469 6.7798 3.0 41.0 -83.5 3.2356 3.9 ------ UNKNOWN
Plot creation:
Sun May 31 15:16:28 EDT 2015