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
259.0081 55.3913 0.0056 33.6705 -101.4636 5.3084307 34.430 TRIG_00306778
Foreground time interval of the image:
-0.328 43.420 (delta_t = 43.748 [sec])
Background time interval of the image:
-132.915 -0.328 (delta_t = 132.587 [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 -0.328 sec. to 43.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28538 ( -0.0683079 0.0680927 )
Norm@50keV : 8.09523E-03 ( -0.000302179 0.000302175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.77 using 59 PHA bins.
# Reduced chi-squared = 0.8556 for 57 degrees of freedom
# Null hypothesis probability = 7.728952e-01
Photon flux (15-150 keV) in 43.75 sec: 0.963229 ( -0.0379726 0.0380417 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51246e-06 ( -1.42884e-07 1.43262e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.328 sec. to 43.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01850 ( -0.284828 0.270553 )
Epeak [keV] : 201.644 ( -76.5348 4400.55 )
Norm@50keV : 1.07586E-02 ( -0.00239626 0.00369611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.87 using 59 PHA bins.
# Reduced chi-squared = 0.8191 for 56 degrees of freedom
# Null hypothesis probability = 8.309642e-01
Photon flux (15-150 keV) in 43.75 sec: 0.948728 ( -0.040475 0.040522 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4542e-06 ( -1.56796e-07 1.55838e-07 ) ergs/cm2
Band function
Time interval is from -0.328 sec. to 43.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.102485 ( -0.829158 3.56467 )
beta : -1.38910 ( 1.38741 0.108004 )
Epeak [keV] : 57.9467 ( -26.7881 214.417 )
Norm@50keV : 4.14738E-02 ( -0.0430121 9.75889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.60 using 59 PHA bins.
# Reduced chi-squared = 0.7926 for 55 degrees of freedom
# Null hypothesis probability = 8.661597e-01
Photon flux (15-150 keV) in 43.75 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] : 18.1731 ( )
R^2/D10^2 : 5.86106E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 170.23 using 59 PHA bins.
# Reduced chi-squared = 2.9865 for 57 degrees of freedom
# Null hypothesis probability = 3.294946e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.690e-07 1.391e-08
25- 50 7.873e-07 4.156e-08
50-150 1.892e-06 1.339e-07
15-150 2.848e-06 1.277e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.03470 (-0.152345 0.152297)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.59 using 59 PHA bins.
# Reduced chi-squared = 1.607 for 57 degrees of freedom
# Null hypothesis probability = 2.485055e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.397e-07 1.645e-08
25- 50 8.458e-07 3.369e-08
50-150 1.855e-06 7.131e-08
15-150 3.140e-06 1.273e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.72977 (-1.27478 1.42382)
R1^2/D10^2 : 0.418648 (-0.147007 0.258495)
kT2 [keV] : 33.2255 (-5.25426 9.2042)
R2^2/D10^2 : 6.32333E-03 (-0.00340339 0.00510809)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.43 using 59 PHA bins.
# Reduced chi-squared = 0.8442 for 55 degrees of freedom
# Null hypothesis probability = 7.878920e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.121e-07 4.441e-08
25- 50 8.287e-07 8.422e-08
50-150 2.326e-06 4.331e-07
15-150 3.467e-06 4.657e-07
Peak spectrum fit
Power-law model
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06733 ( -0.107926 0.107177 )
Norm@50keV : 4.39965E-02 ( -0.00274632 0.00274566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.65 using 59 PHA bins.
# Reduced chi-squared = 0.7132 for 57 degrees of freedom
# Null hypothesis probability = 9.499147e-01
Photon flux (15-150 keV) in 1 sec: 5.08840 ( -0.322617 0.322733 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6491e-07 ( -3.2685e-08 3.28042e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.906133 ( -0.436374 0.21407 )
Epeak [keV] : 380.266 ( -380.266 -380.266 )
Norm@50keV : 5.22550E-02 ( -0.0104744 0.0296523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.20 using 59 PHA bins.
# Reduced chi-squared = 0.7178 for 56 degrees of freedom
# Null hypothesis probability = 9.449950e-01
Photon flux (15-150 keV) in 1 sec: 5.06320 ( -0.32861 0.32847 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61846e-07 ( -3.4154e-08 3.392e-08 ) ergs/cm2
Band function
Time interval is from 0.128 sec. to 1.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.71871 ( -2.71871 -2.71871 )
beta : -1.10936 ( -0.139499 0.123243 )
Epeak [keV] : 29.5112 ( -29.5112 108.989 )
Norm@50keV : 34.4148 ( -34.4148 928.678 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.51 using 59 PHA bins.
# Reduced chi-squared = 0.7185 for 55 degrees of freedom
# Null hypothesis probability = 9.427392e-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] : 20.7537 (-1.73298 1.9394)
R^2/D10^2 : 0.217785 (-0.0536249 0.0695032)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.80 using 59 PHA bins.
# Reduced chi-squared = 1.558 for 57 degrees of freedom
# Null hypothesis probability = 4.459288e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.781e-08 2.395e-09
25- 50 9.087e-08 8.510e-09
50-150 2.914e-07 3.520e-08
15-150 4.001e-07 3.260e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 20.4051 (-1.32307 1.32307)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.07 using 59 PHA bins.
# Reduced chi-squared = 1.633 for 57 degrees of freedom
# Null hypothesis probability = 1.806823e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.079e-08 4.000e-09
25- 50 9.770e-08 1.062e-08
50-150 2.143e-07 5.330e-08
15-150 3.628e-07 6.660e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.93191 (-1.9732 2.69183)
R1^2/D10^2 : 2.54336 (-1.4267 3.88094)
kT2 [keV] : 33.5633 (-6.41666 15.2793)
R2^2/D10^2 : 4.06032E-02 (-0.0275165 0.0446335)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.96 using 59 PHA bins.
# Reduced chi-squared = 0.7447 for 55 degrees of freedom
# Null hypothesis probability = 9.204613e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.541e-08 1.257e-08
25- 50 9.248e-08 1.973e-08
50-150 3.367e-07 9.565e-08
15-150 4.646e-07 1.311e-07
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: 1.28538 ( -0.0683079 0.0680927 )
Norm@50keV : 8.09523E-03 ( -0.000302179 0.000302175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.77 using 59 PHA bins.
# Reduced chi-squared = 0.8556 for 57 degrees of freedom
# Null hypothesis probability = 7.728952e-01
Photon flux (15-150 keV) in 43.75 sec: 0.963229 ( -0.0379726 0.0380417 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51246e-06 ( -1.42884e-07 1.43262e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01850 ( -0.284828 0.270553 )
Epeak [keV] : 201.644 ( -76.5348 4400.55 )
Norm@50keV : 1.07586E-02 ( -0.00239626 0.00369611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.87 using 59 PHA bins.
# Reduced chi-squared = 0.8191 for 56 degrees of freedom
# Null hypothesis probability = 8.309642e-01
Photon flux (15-150 keV) in 43.75 sec: 0.948728 ( -0.040475 0.040522 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4542e-06 ( -1.56796e-07 1.55838e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.102485 ( -0.829158 3.56467 )
beta : -1.38910 ( 1.38741 0.108004 )
Epeak [keV] : 57.9467 ( -26.7881 214.417 )
Norm@50keV : 4.14738E-02 ( -0.0430121 9.75889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.60 using 59 PHA bins.
# Reduced chi-squared = 0.7926 for 55 degrees of freedom
# Null hypothesis probability = 8.661597e-01
Photon flux (15-150 keV) in 43.75 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) = 7.75e-07
S(50-100 keV) = 1.27e-06
T90 vs. Hardness ratio plot
T90 = 29.5519999861717 sec.
Hardness ratio (energy fluence ratio) = 1.63871
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.76856
Count Ratio (50-100 keV) / (15-25 keV) = 1.58536
Mask shadow pattern
IMX = -1.323988251153645E-01, IMY = 6.528828242920284E-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:
-132.915400 -0.328000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3603 35.3884 12.1 29.4 -63.0 -0.1471 -0.9 5.5 Her X-1
203.1634 -3.7668 2.3 42.4 58.4 2.1083 5.0 ------ UNKNOWN
229.8173 -11.0839 2.3 48.7 20.6 1.6145 5.1 ------ UNKNOWN
162.0736 62.8832 2.3 42.8 -177.5 0.8080 5.0 ------ UNKNOWN
266.3436 10.1180 3.5 50.9 -35.4 1.2787 3.3 ------ UNKNOWN
271.0396 31.9011 3.1 43.7 -64.2 1.8640 3.7 ------ UNKNOWN
273.7099 67.1019 3.4 43.8 -116.1 1.8213 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.328000 43.420000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4272 35.4760 11.9 29.4 -63.2 -0.1104 -1.0 8.2 Her X-1
259.0081 55.3914 0.3 33.7 -101.5 5.3077 34.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
208.084600 962.484000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6691 35.2234 0.0 20.4 18.7 -0.2099 -0.7 12.6 Her X-1
268.3265 -1.4124 17.0 57.3 -2.5 1.2936 0.7 3.5 SW J1753.5-0127
288.6751 10.9458 5.2 50.2 -30.7 -1.9915 -2.2 7.3 GRS 1915+105
299.5648 35.2019 0.6 34.2 -62.4 11.5491 20.9 1.3 Cyg X-1
308.0971 40.9527 2.6 34.9 -77.9 3.7244 4.4 0.6 Cyg X-3
106.1979 68.7630 2.9 54.2 176.8 5.3589 4.0 ------ UNKNOWN
252.9535 87.8005 2.3 32.4 -171.8 1.8294 5.0 ------ UNKNOWN
293.4878 59.8891 2.4 18.8 -109.4 1.6589 4.8 ------ UNKNOWN
288.1969 13.5267 3.0 47.6 -31.4 3.0803 3.9 ------ UNKNOWN
310.0225 38.1816 3.5 37.9 -76.2 3.3158 3.3 ------ UNKNOWN
298.8044 14.8660 2.0 50.8 -44.5 11.7438 5.8 ------ UNKNOWN
Plot creation:
Sun May 31 08:03:31 EDT 2015