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
294.7439 40.3965 0.0157 21.3905 -79.6823 0.4333063 12.330 TRIG_00349931
Foreground time interval of the image:
-0.392 8.496 (delta_t = 8.888 [sec])
Background time interval of the image:
-239.444 -0.392 (delta_t = 239.052 [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 0.064000
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 0.064000
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 0.064000
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 -0.392 sec. to 8.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67905 ( -0.282721 0.294626 )
Norm@50keV : 2.87645E-03 ( -0.000474163 0.000453746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9067 for 57 degrees of freedom
# Null hypothesis probability = 6.742088e-01
Photon flux (15-150 keV) in 8.888 sec: 0.379269 ( -0.0530366 0.0530632 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3712e-07 ( -4.08605e-08 4.18324e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.392 sec. to 8.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67888 ( -0.388345 0.278493 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 2.88077E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.69 using 59 PHA bins.
# Reduced chi-squared = 0.9231 for 56 degrees of freedom
# Null hypothesis probability = 6.384822e-01
Photon flux (15-150 keV) in 8.888 sec: 0.379254 ( -0.05274 0.052819 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35783e-07 ( -3.90432e-08 3.93712e-08 ) ergs/cm2
Band function
Time interval is from -0.392 sec. to 8.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39026 ( 1.39026 1.39026 )
beta : -1.67898 ( 1.67898 0.282744 )
Epeak [keV] : 14.9974 ( -14.9968 -14.9968 )
Norm@50keV : 6.74488E-03 ( -0.0043014 0.0790206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9397 for 55 degrees of freedom
# Null hypothesis probability = 6.022196e-01
Photon flux (15-150 keV) in 8.888 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] : 10.9585 (-2.66707 4.19383)
R^2/D10^2 : 0.117639 (-0.11536 0.212371)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.89 using 59 PHA bins.
# Reduced chi-squared = 1.419 for 57 degrees of freedom
# Null hypothesis probability = 2.042552e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.622e-08 8.257e-09
25- 50 7.377e-08 1.621e-08
50-150 4.989e-08 1.844e-08
15-150 1.499e-07 3.822e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 181.183 (-99.97 -181.964)
Norm : 1.51832 (-0.219147 0.304601)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.86 using 59 PHA bins.
# Reduced chi-squared = 0.9624 for 57 degrees of freedom
# Null hypothesis probability = 5.558576e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.400e-08 1.914e-08
25- 50 6.466e-08 3.485e-08
50-150 1.372e-07 7.559e-08
15-150 2.359e-07 1.306e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.70388 (-1.4173 1.82214)
R1^2/D10^2 : 1.17214 (-0.772554 2.71614)
kT2 [keV] : 41.8963 (-16.9824 112.122)
R2^2/D10^2 : 1.24636E-03 (-0.00105 0.00398014)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.61 using 59 PHA bins.
# Reduced chi-squared = 0.8657 for 55 degrees of freedom
# Null hypothesis probability = 7.498665e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.415e-08 1.869e-08
25- 50 5.396e-08 2.243e-08
50-150 1.722e-07 9.849e-08
15-150 2.704e-07 1.211e-07
Peak spectrum fit
Power-law model
Time interval is from -0.372 sec. to 0.628 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30087 ( -0.173281 0.172083 )
Norm@50keV : 1.42748E-02 ( -0.00146283 0.00145866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.76 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.470572e-01
Photon flux (15-150 keV) in 1 sec: 1.70330 ( -0.175928 0.176091 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41033e-07 ( -1.61457e-08 1.6291e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.372 sec. to 0.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.980617 ( -0.765938 0.30265 )
Epeak [keV] : 160.387 ( -160.453 -160.453 )
Norm@50keV : 2.07602E-02 ( -0.00769518 0.0288221 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.09 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 56 degrees of freedom
# Null hypothesis probability = 4.344870e-01
Photon flux (15-150 keV) in 1 sec: 1.68435 ( -0.09048 0.18006 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37638e-07 ( -1.8064e-08 1.7791e-08 ) ergs/cm2
Band function
Time interval is from -0.372 sec. to 0.628 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.52821 -5 )
beta : -1.43439 ( -0.216601 0.205079 )
Epeak [keV] : 27.0966 ( -6.62778 5.23938 )
Norm@50keV : 815.537 ( -82.1648 3561.97 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.99 using 59 PHA bins.
# Reduced chi-squared = 0.9816 for 55 degrees of freedom
# Null hypothesis probability = 5.133753e-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] : 16.3163 (-2.06135 2.44391)
R^2/D10^2 : 0.151208 (-0.0570613 0.0883771)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.37 using 59 PHA bins.
# Reduced chi-squared = 1.322 for 57 degrees of freedom
# Null hypothesis probability = 5.204932e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.286e-09 1.588e-09
25- 50 3.545e-08 4.850e-09
50-150 6.644e-08 1.307e-08
15-150 1.102e-07 1.535e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.02493 (-0.71952 0.719493)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.38 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.909975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.750e-08 9.705e-09
25- 50 3.366e-08 1.592e-08
50-150 7.381e-08 4.060e-08
15-150 1.250e-07 6.805e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.95964 (-3.7301 3.84634)
R1^2/D10^2 : 0.768976 (-0.407186 2.1006)
kT2 [keV] : 36.2758 (-36.1656 -41.9968)
R2^2/D10^2 : 7.82335E-03 (-0.00435224 0.0402815)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.67 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.124770e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.341e-08 6.640e-09
25- 50 3.472e-08 1.653e-08
50-150 8.883e-08 4.756e-08
15-150 1.370e-07 6.398e-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: 1.67905 ( -0.282721 0.294626 )
Norm@50keV : 2.87645E-03 ( -0.000474163 0.000453746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9067 for 57 degrees of freedom
# Null hypothesis probability = 6.742088e-01
Photon flux (15-150 keV) in 8.888 sec: 0.379269 ( -0.0530366 0.0530632 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3712e-07 ( -4.08605e-08 4.18324e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67888 ( -0.388345 0.278493 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 2.88077E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.69 using 59 PHA bins.
# Reduced chi-squared = 0.9231 for 56 degrees of freedom
# Null hypothesis probability = 6.384822e-01
Photon flux (15-150 keV) in 8.888 sec: 0.379254 ( -0.05274 0.052819 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35783e-07 ( -3.90432e-08 3.93712e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39026 ( 1.39026 1.39026 )
beta : -1.67898 ( 1.67898 0.282744 )
Epeak [keV] : 14.9974 ( -14.9968 -14.9968 )
Norm@50keV : 6.74488E-03 ( -0.0043014 0.0790206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9397 for 55 degrees of freedom
# Null hypothesis probability = 6.022196e-01
Photon flux (15-150 keV) in 8.888 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) = 6.36e-08
S(50-100 keV) = 7.95e-08
T90 vs. Hardness ratio plot
T90 = 8.47600001096725 sec.
Hardness ratio (energy fluence ratio) = 1.25
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.887903
Count Ratio (50-100 keV) / (15-25 keV) = 0.716636
Mask shadow pattern
IMX = 7.015688471606696E-02, IMY = 3.853698884002041E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-239.444000 -0.392000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5309 35.3511 7.9 12.4 139.9 0.2730 1.5 3.6 Her X-1
268.3829 -1.4396 6.8 34.9 38.4 0.5054 1.7 1.2 SW J1753.5-0127
274.0040 -14.0360 8.7 47.7 30.6 0.9861 1.3 0.1 GX 17+2
288.7641 10.9564 0.8 28.7 -6.2 2.8908 14.2 2.1 GRS 1915+105
299.5872 35.2053 0.3 25.0 -66.0 8.5609 36.2 0.3 Cyg X-1
308.1765 41.0625 4.4 31.6 -78.7 0.8168 2.6 7.2 Cyg X-3
231.2929 20.5267 3.3 36.0 115.6 1.5512 3.5 ------ UNKNOWN
255.4201 7.5872 3.0 28.9 66.3 1.2001 3.9 ------ UNKNOWN
270.4597 3.3046 2.5 30.1 34.5 1.1389 4.5 ------ UNKNOWN
217.6351 52.9853 2.6 41.3 171.0 1.4114 4.4 ------ UNKNOWN
319.9033 62.9160 3.0 43.0 -112.2 3.2976 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.392000 8.496000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3488 35.4643 6.3 12.5 140.4 -0.0584 -1.8 9.0 Her X-1
268.4125 -1.5502 3.6 35.0 38.3 0.1770 3.2 6.4 SW J1753.5-0127
274.1412 -14.1256 6.7 47.8 30.4 0.2162 1.7 9.5 GX 17+2
288.7671 10.9460 26.6 28.7 -6.2 0.0155 0.4 1.8 GRS 1915+105
299.8094 35.1235 0.0 25.1 -65.8 0.0556 1.4 11.7 Cyg X-1
308.1292 40.9170 8.5 31.5 -78.4 0.0725 1.4 2.3 Cyg X-3
209.6112 45.9004 2.5 46.5 160.8 0.3238 4.6 ------ UNKNOWN
266.8997 9.1547 2.1 24.4 42.6 0.2157 5.5 ------ UNKNOWN
204.3335 67.8298 2.3 50.0 -169.8 0.3308 5.0 ------ UNKNOWN
294.7439 40.3966 0.9 21.4 -79.7 0.4334 12.3 ------ UNKNOWN
258.5004 72.8842 2.1 39.9 -148.2 0.2608 5.4 ------ UNKNOWN
296.7044 67.0470 2.6 37.2 -126.0 0.2308 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
53.256590 962.632500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5191 35.3671 12.8 31.9 107.0 -0.8887 -0.9 3.4 Her X-1
288.8000 10.9366 0.7 29.9 24.6 10.2510 15.8 0.5 GRS 1915+105
299.5861 35.2015 0.2 6.4 -25.2 32.5421 66.6 0.2 Cyg X-1
308.1078 40.9896 1.5 10.2 -84.9 3.8908 7.6 2.2 Cyg X-3
326.1938 38.2926 7.7 24.3 -82.5 1.1022 1.5 2.0 Cyg X-2
275.5612 33.3766 3.0 16.8 84.4 2.1593 3.9 ------ UNKNOWN
277.5287 55.5176 2.7 18.9 161.8 2.2072 4.3 ------ UNKNOWN
199.8665 78.6819 2.9 51.5 178.4 5.8691 4.0 ------ UNKNOWN
135.8655 80.4408 2.9 58.6 -171.1 15.9320 4.0 ------ UNKNOWN
116.1237 87.0853 3.0 52.5 -167.2 6.1130 3.9 ------ UNKNOWN
51.3122 83.1585 3.9 53.0 -159.4 4.5827 2.9 ------ UNKNOWN
336.9942 59.6214 3.3 32.4 -127.8 2.6084 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 04:21:11 EDT 2015