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
46.2357 -47.3880 0.0198 26.7281 -1.4857 0.0377199 9.671 TRIG_00259803
Foreground time interval of the image:
0.000 0.084 (delta_t = 0.084 [sec])
Background time interval of the image:
-239.700 0.000 (delta_t = 239.700 [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 0.000 sec. to 0.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30587 ( -0.234633 0.238983 )
Norm@50keV : 2.45562E-02 ( -0.00448936 0.00448908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.82 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.738291e-01
Photon flux (15-150 keV) in 0.084 sec: 2.93264 ( -0.552412 0.553773 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03555e-08 ( -3.87082e-09 3.87771e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.554944 ( -1.53749 1.10469 )
Epeak [keV] : 81.3766 ( -17.7842 37.0229 )
Norm@50keV : 0.168756 ( -0.168754 0.650863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.43 using 59 PHA bins.
# Reduced chi-squared = 0.9004 for 56 degrees of freedom
# Null hypothesis probability = 6.850107e-01
Photon flux (15-150 keV) in 0.084 sec: 2.99103 ( -0.54708 0.55041 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16201e-08 ( -4.32499e-09 4.23419e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.16335 ( -4.15849 -3.91097 )
beta : -2.04844 ( 9.32433 19.2976 )
Epeak [keV] : 51.2639 ( -20.1925 34.8173 )
Norm@50keV : 5.69134 ( -5.60854 30.7583 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 55 degrees of freedom
# Null hypothesis probability = 6.506994e-01
Photon flux (15-150 keV) in 0.084 sec: 3.02326 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16126e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.0583 (-3.40069 3.88611)
R^2/D10^2 : 0.186413 (-0.0873755 0.167119)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.73 using 59 PHA bins.
# Reduced chi-squared = 0.9075 for 57 degrees of freedom
# Null hypothesis probability = 6.724741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.117e-09 3.724e-10
25- 50 5.383e-09 1.494e-09
50-150 1.438e-08 4.243e-09
15-150 2.088e-08 5.170e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.5018 (-2.29486 2.29473)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.529824e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.615e-09 1.544e-09
25- 50 5.030e-09 2.914e-09
50-150 1.103e-08 6.405e-09
15-150 1.868e-08 1.058e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.1055 (-11.9257 -11.9257)
R1^2/D10^2 : 0.398632 (-0.40231 -0.40231)
kT2 [keV] : 26.2350 (-26.0566 -26.0566)
R2^2/D10^2 : 4.02620E-02 (-0.0414819 0.235943)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.08 using 59 PHA bins.
# Reduced chi-squared = 0.9105 for 55 degrees of freedom
# Null hypothesis probability = 6.627232e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.433e-09 1.026e-09
25- 50 5.591e-09 3.701e-09
50-150 1.451e-08 9.467e-09
15-150 2.153e-08 1.393e-08
Peak spectrum fit
Power-law model
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09982 ( -0.602846 0.540941 )
Norm@50keV : 3.17555E-03 ( -0.00106288 0.00105175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.72 using 59 PHA bins.
# Reduced chi-squared = 0.9425 for 57 degrees of freedom
# Null hypothesis probability = 5.988853e-01
Photon flux (15-150 keV) in 1 sec: 0.368337 ( -0.125835 0.127471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32025e-08 ( -1.14568e-08 1.165e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.31230E-02 ( -4.57599 6.84009 )
Epeak [keV] : 95.4308 ( -44.1611 -95.4309 )
Norm@50keV : 1.09525E-02 ( -0.0109529 1.89313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9483 for 56 degrees of freedom
# Null hypothesis probability = 5.852108e-01
Photon flux (15-150 keV) in 1 sec: 0.353586 ( -0.129589 0.131463 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08436e-08 ( -1.30045e-08 1.27263e-08 ) ergs/cm2
Band function
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90676 ( -4.90676 -4.90676 )
beta : -1.67489 ( -1.82902 0.891153 )
Epeak [keV] : 43.6368 ( -43.6368 31.8084 )
Norm@50keV : 9.64975 ( -3.06063 1.05256e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9459 for 55 degrees of freedom
# Null hypothesis probability = 5.891412e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.09761e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.3737 (-5.93154 11.4455)
R^2/D10^2 : 2.35461E-02 (-0.0234982 0.0642277)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.68 using 59 PHA bins.
# Reduced chi-squared = 0.9418 for 57 degrees of freedom
# Null hypothesis probability = 6.003179e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.581e-09 1.038e-09
25- 50 7.423e-09 4.617e-09
50-150 1.828e-08 1.224e-08
15-150 2.729e-08 1.830e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-108.063 -199.363)
Norm : 1.54741 (-0.524435 0.524434)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.33 using 59 PHA bins.
# Reduced chi-squared = 0.9707 for 57 degrees of freedom
# Null hypothesis probability = 5.378684e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.853e-09 2.417e-09
25- 50 7.412e-09 4.452e-09
50-150 1.626e-08 1.023e-08
15-150 2.752e-08 1.739e-08
Double BB
R1^2/D10^2 : 2.02097E-04 ( )
kT2 [keV] : 13.2461 (-13.2568 12.5757)
R2^2/D10^2 : 5.46768E-02 (-0.0545635 -0.0545635)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.63 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.54 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
# Reduced chi-squared = 0.9569 for 55 degrees of freedom
# Reduced chi-squared = 0.9552 for 55 degrees of freedom
# Reduced chi-squared = 0.9542 for 55 degrees of freedom
# Null hypothesis probability = 5.657400e-01
# Null hypothesis probability = 5.692700e-01
# Null hypothesis probability = 5.715297e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.217e-09 1.416e-09
25- 50 7.785e-09 5.895e-09
50-150 2.175e-08 1.345e-08
15-150 3.175e-08 1.733e-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: 1.30587 ( -0.234633 0.238983 )
Norm@50keV : 2.45562E-02 ( -0.00448936 0.00448908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.82 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.738291e-01
Photon flux (15-150 keV) in 0.084 sec: 2.93264 ( -0.552412 0.553773 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03555e-08 ( -3.87082e-09 3.87771e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.554944 ( -1.53749 1.10469 )
Epeak [keV] : 81.3766 ( -17.7842 37.0229 )
Norm@50keV : 0.168756 ( -0.168754 0.650863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.43 using 59 PHA bins.
# Reduced chi-squared = 0.9004 for 56 degrees of freedom
# Null hypothesis probability = 6.850107e-01
Photon flux (15-150 keV) in 0.084 sec: 2.99103 ( -0.54708 0.55041 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16201e-08 ( -4.32499e-09 4.23419e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.16335 ( -4.15849 -3.91097 )
beta : -2.04844 ( 9.32433 19.2976 )
Epeak [keV] : 51.2639 ( -20.1925 34.8173 )
Norm@50keV : 5.69134 ( -5.60854 30.7581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 55 degrees of freedom
# Null hypothesis probability = 6.506994e-01
Photon flux (15-150 keV) in 0.084 sec: 3.02326 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16126e-08 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.55e-09
S(50-100 keV) = 7.35e-09
T90 vs. Hardness ratio plot
T90 = 0.0680000185966492 sec.
Hardness ratio (energy fluence ratio) = 1.61538
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 3.30288
Count Ratio (50-100 keV) / (15-25 keV) = 2.99056
Mask shadow pattern
IMX = 5.033938484930026E-01, IMY = 1.305644198141932E-02
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:
-239.700000 0.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4811 -60.5219 3.5 42.9 129.7 1.9647 3.3 7.8 Cen X-3
186.7919 -62.6890 14.0 42.6 141.5 0.3725 0.8 6.1 GX 301-2
264.4847 -44.4165 4.5 57.1 -159.4 2.1709 2.6 11.2 4U 1735-44
90.3937 -40.1253 2.7 42.5 50.4 2.6757 4.3 ------ UNKNOWN
117.0550 -60.0443 2.5 32.1 90.4 1.4524 4.5 ------ UNKNOWN
67.2324 -35.7503 3.3 41.2 22.3 1.0205 3.4 ------ UNKNOWN
239.1698 -48.3236 2.7 56.9 179.3 4.2897 4.4 ------ UNKNOWN
28.7215 -68.2676 2.6 5.5 -40.0 0.7238 4.5 ------ UNKNOWN
255.6829 -48.8123 1.8 54.3 -167.8 3.6208 6.3 ------ UNKNOWN
280.7204 -42.7562 4.3 55.3 -145.3 2.7698 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 0.084000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2030 -60.7772 0.0 42.6 129.6 0.0281 2.2 9.8 Cen X-3
186.4182 -62.7170 8.5 42.6 141.3 -0.0131 -1.3 7.3 GX 301-2
264.6744 -44.4452 5.6 57.0 -159.2 0.0319 2.1 3.0 4U 1735-44
104.9952 -46.6174 3.1 40.6 69.0 0.0530 3.7 ------ UNKNOWN
46.2358 -47.3880 1.2 26.7 -1.5 0.0377 9.7 ------ UNKNOWN
357.2513 -43.4822 2.1 34.4 -70.4 0.0364 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
61.400600 962.389100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
47.7286 5.1762 2.3 52.6 7.6 6.9004 5.0 ------ UNKNOWN
204.6889 -74.8661 4.8 56.9 179.2 6.8708 2.4 ------ UNKNOWN
231.9861 -80.9646 4.0 51.6 -173.1 3.5170 2.9 ------ UNKNOWN
Plot creation:
Sun May 31 10:54:33 EDT 2015