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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
312.8135 -78.3819 0.0020 28.2572 -126.9372 20.2641644 98.222 TRIG_00278854
Foreground time interval of the image:
-15.620 12.725 (delta_t = 28.345 [sec])
Background time interval of the image:
-239.776 -15.620 (delta_t = 224.156 [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 -15.620 sec. to 33.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33558 ( -0.0236716 0.0235742 )
Norm@50keV : 4.19919E-02 ( -0.000571091 0.000569807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.05 using 59 PHA bins.
# Reduced chi-squared = 0.5974 for 57 degrees of freedom
# Null hypothesis probability = 9.932111e-01
Photon flux (15-150 keV) in 48.74 sec: 5.04404 ( -0.0811821 0.081485 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00551e-05 ( -2.47738e-07 2.47733e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.620 sec. to 33.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22021 ( -0.0975765 0.0956264 )
Epeak [keV] : 443.808 ( -170.876 1550.07 )
Norm@50keV : 4.64592E-02 ( -0.00366776 0.00404599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.84 using 59 PHA bins.
# Reduced chi-squared = 0.5329 for 56 degrees of freedom
# Null hypothesis probability = 9.984080e-01
Photon flux (15-150 keV) in 48.74 sec: 4.98770 ( -0.09196 0.09262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99935e-05 ( -2.54764e-07 2.54618e-07 ) ergs/cm2
Band function
Time interval is from -15.620 sec. to 33.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22020 ( -0.58158 4.63812 )
beta : -10.00000 ( 10 2.57394e-12 )
Epeak [keV] : 443.729 ( -75.5029 1544.27 )
Norm@50keV : 4.64534E-02 ( -0.00057371 0.00404244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.84 using 59 PHA bins.
# Reduced chi-squared = 0.5425 for 55 degrees of freedom
# Null hypothesis probability = 9.977737e-01
Photon flux (15-150 keV) in 48.74 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] : 22.5158 ( )
R^2/D10^2 : 0.145138 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1239.63 using 59 PHA bins.
# Reduced chi-squared = 21.7478 for 57 degrees of freedom
# Null hypothesis probability = 7.356819e-222
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.566e-07 1.950e-08
25- 50 3.519e-06 7.238e-08
50-150 1.333e-05 2.071e-07
15-150 1.751e-05 2.145e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 22.3393 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 477.82 using 59 PHA bins.
# Reduced chi-squared = 8.3827 for 57 degrees of freedom
# Null hypothesis probability = 8.690097e-68
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.711e-06 4.289e-08
25- 50 5.216e-06 8.286e-08
50-150 1.144e-05 1.803e-07
15-150 1.937e-05 2.924e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.37929 (-0.430136 0.449873)
R1^2/D10^2 : 2.47301 (-0.410245 0.509832)
kT2 [keV] : 33.3905 (-1.33391 1.51741)
R2^2/D10^2 : 3.27261E-02 (-0.00467476 0.00504884)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.94 using 59 PHA bins.
# Reduced chi-squared = 0.5444 for 55 degrees of freedom
# Null hypothesis probability = 9.976699e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.840e-06 1.004e-07
25- 50 4.664e-06 1.209e-07
50-150 1.344e-05 2.486e-07
15-150 1.994e-05 3.461e-07
Peak spectrum fit
Power-law model
Time interval is from 10.848 sec. to 11.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05891 ( -0.0366613 0.0365548 )
Norm@50keV : 0.213810 ( -0.00449256 0.00448763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.78 using 59 PHA bins.
# Reduced chi-squared = 1.365 for 57 degrees of freedom
# Null hypothesis probability = 3.506968e-02
Photon flux (15-150 keV) in 1 sec: 24.7110 ( -0.539671 0.540201 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26564e-06 ( -4.91221e-08 4.91351e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.848 sec. to 11.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.678585 ( -0.157576 0.152615 )
Epeak [keV] : 213.491 ( -44.3981 97.7883 )
Norm@50keV : 0.307298 ( -0.0406572 0.0482328 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.94 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 56 degrees of freedom
# Null hypothesis probability = 3.684315e-01
Photon flux (15-150 keV) in 1 sec: 24.2474 ( -0.5641 0.566 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24265e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 10.848 sec. to 11.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.684847 ( -0.131698 0.0704287 )
beta : -9.34756 ( 9.37092 19.3709 )
Epeak [keV] : 216.250 ( -20.9001 36.0721 )
Norm@50keV : 0.305396 ( -0.0290402 0.0311485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.95 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Null hypothesis probability = 3.332446e-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] : 22.8021 ( )
R^2/D10^2 : 0.787060 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 373.86 using 59 PHA bins.
# Reduced chi-squared = 6.5589 for 57 degrees of freedom
# Null hypothesis probability = 3.973611e-48
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.447e-08 3.025e-09
25- 50 4.021e-07 1.220e-08
50-150 1.562e-06 4.950e-08
15-150 2.039e-06 4.750e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 104.277 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 594.00 using 59 PHA bins.
# Reduced chi-squared = 10.421 for 57 degrees of freedom
# Null hypothesis probability = 1.985264e-90
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.597e-07 5.400e-09
25- 50 4.995e-07 1.085e-08
50-150 1.095e-06 2.400e-08
15-150 1.855e-06 4.650e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.56422 (-0.8422 0.925678)
R1^2/D10^2 : 8.58742 (-2.26798 3.32727)
kT2 [keV] : 33.1977 (-2.20189 2.78696)
R2^2/D10^2 : 0.205015 (-0.048598 0.0538539)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.18 using 59 PHA bins.
# Reduced chi-squared = 0.9850 for 55 degrees of freedom
# Null hypothesis probability = 5.060573e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.524e-07 1.390e-08
25- 50 4.468e-07 2.115e-08
50-150 1.657e-06 7.500e-08
15-150 2.256e-06 9.600e-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: 1.26697 ( -0.0249728 0.0248889 )
Norm@50keV : 4.99485E-02 ( -0.000711228 0.000709875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.75 using 59 PHA bins.
# Reduced chi-squared = 0.6448 for 57 degrees of freedom
# Null hypothesis probability = 9.829327e-01
Photon flux (15-150 keV) in 28.34 sec: 5.92424 ( -0.0967953 0.0971047 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41043e-05 ( -1.84716e-07 1.84731e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13691 ( -0.102847 0.100642 )
Epeak [keV] : 432.240 ( -159.764 1965.7 )
Norm@50keV : 5.60421E-02 ( -0.00465515 0.00520403 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.91 using 59 PHA bins.
# Reduced chi-squared = 0.5697 for 56 degrees of freedom
# Null hypothesis probability = 9.960507e-01
Photon flux (15-150 keV) in 28.34 sec: 5.85674 ( -0.10813 0.10881 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40577e-05 ( -1.89566e-07 1.89453e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13690 ( -0.658462 0.625005 )
beta : -9.99547 ( 9.99011 19.9901 )
Epeak [keV] : 432.164 ( -136.693 500.39 )
Norm@50keV : 5.60364E-02 ( -0.000735705 0.00521411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.91 using 59 PHA bins.
# Reduced chi-squared = 0.5801 for 55 degrees of freedom
# Null hypothesis probability = 9.946481e-01
Photon flux (15-150 keV) in 28.34 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) = 4.55e-06
S(50-100 keV) = 7.22e-06
T90 vs. Hardness ratio plot
T90 = 20.9000000059605 sec.
Hardness ratio (energy fluence ratio) = 1.58681
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.53287
Count Ratio (50-100 keV) / (15-25 keV) = 1.35415
Mask shadow pattern
IMX = -3.229942853789712E-01, IMY = 4.296065986230516E-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:
-239.776000 -15.620000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5723 -40.6710 12.7 52.5 -29.2 0.6469 0.9 7.3 Vela X-1
170.5922 -60.5774 9.3 23.3 -26.5 0.2140 1.2 8.6 Cen X-3
186.3294 -62.8007 3.3 15.6 -22.5 0.5970 3.5 9.2 GX 301-2
255.9836 -37.8398 0.6 33.3 132.3 5.8716 19.9 0.3 4U 1700-377
256.6186 -36.4836 10.3 34.7 132.1 0.3620 1.1 9.6 GX 349+2
264.6840 -44.5161 6.1 30.9 149.4 0.4583 1.9 4.7 4U 1735-44
270.0995 -25.7182 4.3 49.4 140.7 2.2709 2.7 11.1 GRS 1758-258
275.9492 -30.3801 3.8 47.6 149.7 1.9779 3.1 1.5 H1820-303
263.0936 -33.7801 3.1 39.5 137.9 1.6295 3.7 6.2 GX 354-0
100.8568 -72.1306 4.3 37.9 -76.4 1.2753 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.620000 12.724600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5914 -40.6457 6.9 52.5 -29.1 -1.0249 -1.7 6.2 Vela X-1
170.0785 -60.5235 9.7 23.5 -26.7 0.2166 1.2 9.2 Cen X-3
186.8264 -62.8329 19.0 15.4 -22.3 -0.1002 -0.6 6.0 GX 301-2
255.8773 -38.0027 0.0 33.1 132.3 -0.0912 -0.3 10.8 4U 1700-377
256.3619 -36.3702 7.9 34.7 131.7 -0.4337 -1.5 4.8 GX 349+2
264.5414 -44.4878 7.5 30.9 149.2 0.3119 1.5 8.9 4U 1735-44
270.2711 -25.6254 7.0 49.6 140.8 -1.1831 -1.6 7.3 GRS 1758-258
275.7591 -30.2970 15.3 47.6 149.4 0.3745 0.8 9.6 H1820-303
262.8141 -33.7397 18.1 39.4 137.6 -0.2155 -0.6 10.4 GX 354-0
177.3180 -34.1619 2.3 40.3 14.7 1.2938 5.1 ------ UNKNOWN
312.8135 -78.3818 0.1 28.3 -126.9 20.2619 98.1 ------ UNKNOWN
25.2160 -84.9394 2.3 30.6 -104.6 1.3437 5.1 ------ UNKNOWN
351.3965 -64.4088 2.2 46.1 -129.2 3.9482 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
64.924600 962.284200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5075 -60.5390 4.6 39.3 30.0 2.0439 2.5 7.6 Cen X-3
186.5919 -62.7351 3.6 35.3 41.4 2.3722 3.2 2.8 GX 301-2
264.6533 -44.4970 16.1 38.5 123.1 0.8682 0.7 4.8 4U 1735-44
223.7676 -74.4239 2.9 19.2 56.4 1.8542 4.0 ------ UNKNOWN
312.7271 -78.3658 2.4 0.0 115.0 2.1635 4.8 ------ UNKNOWN
39.5171 -71.9148 4.1 20.8 -59.0 1.3135 2.8 ------ UNKNOWN
67.6217 -48.7465 5.1 47.1 -53.1 6.6921 2.3 ------ UNKNOWN
Plot creation:
Sun May 31 10:18:52 EDT 2015