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
97.7900 -45.9037 0.0050 16.5629 173.7856 1.0477228 38.140 TRIG_00232339
Foreground time interval of the image:
0.244 8.116 (delta_t = 7.872 [sec])
Background time interval of the image:
-239.000 0.244 (delta_t = 239.244 [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 0.244 sec. to 8.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77354 ( -0.0881569 0.0893243 )
Norm@50keV : 7.84782E-03 ( -0.000406705 0.000404009 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.63 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.832484e-01
Photon flux (15-150 keV) in 7.872 sec: 1.07052 ( -0.0520751 0.0521401 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69353e-07 ( -3.03492e-08 3.05448e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 8.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40081 ( -0.40266 0.363514 )
Epeak [keV] : 74.2342 ( -18.0468 490.872 )
Norm@50keV : 1.24022E-02 ( -0.00437658 0.00781138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.58 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 56 degrees of freedom
# Null hypothesis probability = 3.467427e-01
Photon flux (15-150 keV) in 7.872 sec: 1.04809 ( -0.05634 0.05626 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4862e-07 ( -3.66268e-08 3.65749e-08 ) ergs/cm2
Band function
Time interval is from 0.244 sec. to 8.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.759612 ( -0.67388 2.02132 )
beta : -2.01580 ( -0.28081 0.197955 )
Epeak [keV] : 46.7603 ( -15.2827 23.6308 )
Norm@50keV : 3.11456E-02 ( -0.0186712 0.80715 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.581636e-01
Photon flux (15-150 keV) in 7.872 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4634e-07 ( -5.46285e-07 -3.38189e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.8188 ( )
R^2/D10^2 : 0.266177 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 137.16 using 59 PHA bins.
# Reduced chi-squared = 2.4064 for 57 degrees of freedom
# Null hypothesis probability = 1.474143e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.182e-08 5.172e-09
25- 50 1.911e-07 9.604e-09
50-150 1.588e-07 1.905e-08
15-150 4.117e-07 2.110e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 104.888 (-17.3514 29.3072)
Norm : 4.67151 (-0.332652 0.321806)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.68 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.784974e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.610e-08 8.659e-09
25- 50 1.677e-07 1.047e-08
50-150 2.792e-07 7.742e-08
15-150 5.430e-07 8.041e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.32070 (-1.00997 0.969675)
R1^2/D10^2 : 0.769803 (-0.22923 0.388892)
kT2 [keV] : 34.0826 (-8.96168 19.8691)
R2^2/D10^2 : 3.82354E-03 (-0.00279731 0.0072832)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.28 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.269033e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.303e-08 9.466e-09
25- 50 1.786e-07 1.846e-08
50-150 2.956e-07 1.242e-07
15-150 5.573e-07 1.411e-07
Peak spectrum fit
Power-law model
Time interval is from 2.672 sec. to 3.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59616 ( -0.104673 0.105902 )
Norm@50keV : 1.96029E-02 ( -0.00125576 0.00124823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.64 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.581685e-01
Photon flux (15-150 keV) in 1 sec: 2.51608 ( -0.153399 0.15349 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83416e-07 ( -1.26687e-08 1.27598e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.672 sec. to 3.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16319 ( -0.498879 0.441661 )
Epeak [keV] : 90.5841 ( -26.5284 3745.25 )
Norm@50keV : 3.33794E-02 ( -0.0136392 0.027762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.86 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 56 degrees of freedom
# Null hypothesis probability = 1.951217e-01
Photon flux (15-150 keV) in 1 sec: 2.47118 ( -0.16072 0.16002 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76289e-07 ( -1.4814e-08 1.4761e-08 ) ergs/cm2
Band function
Time interval is from 2.672 sec. to 3.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.519507 ( -1.69583 -0.523998 )
beta : -1.78149 ( -0.549053 0.17549 )
Epeak [keV] : 37.5461 ( -12.0166 69.5537 )
Norm@50keV : 0.484827 ( -0.504823 11.0916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.56 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Null hypothesis probability = 2.528991e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77927e-07 ( -1.7792e-07 -1.3424e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9989 (-0.91496 0.998559)
R^2/D10^2 : 0.468182 (-0.110087 0.141507)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.14 using 59 PHA bins.
# Reduced chi-squared = 1.9498 for 57 degrees of freedom
# Null hypothesis probability = 2.366481e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.678e-08 1.720e-09
25- 50 5.778e-08 3.970e-09
50-150 6.172e-08 8.595e-09
15-150 1.363e-07 1.055e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 166.938 (-43.9681 -167.008)
Norm : 10.3484 (-0.680804 0.748217)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.81 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 57 degrees of freedom
# Null hypothesis probability = 2.228355e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.631e-08 2.200e-09
25- 50 4.950e-08 8.005e-09
50-150 1.019e-07 4.112e-08
15-150 1.778e-07 4.760e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.51471 (-2.05046 1.4928)
R1^2/D10^2 : 1.16621 (-0.434083 0.91353)
kT2 [keV] : 48.9156 (-24.402 -49.6296)
R2^2/D10^2 : 3.53876E-03 (-0.00265206 0.026841)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.94 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 55 degrees of freedom
# Null hypothesis probability = 1.913506e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.204e-08 3.450e-09
25- 50 5.557e-08 9.360e-09
50-150 1.029e-07 4.560e-08
15-150 1.805e-07 5.106e-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: 1.77354 ( -0.0881569 0.0893243 )
Norm@50keV : 7.84782E-03 ( -0.000406705 0.000404009 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.63 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.832484e-01
Photon flux (15-150 keV) in 7.872 sec: 1.07052 ( -0.0520751 0.0521401 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69353e-07 ( -3.03492e-08 3.05448e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40081 ( -0.40266 0.363514 )
Epeak [keV] : 74.2342 ( -18.0468 490.229 )
Norm@50keV : 1.24022E-02 ( -0.00437658 0.00781138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.58 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 56 degrees of freedom
# Null hypothesis probability = 3.467427e-01
Photon flux (15-150 keV) in 7.872 sec: 1.04809 ( -0.05634 0.05626 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4862e-07 ( -3.66268e-08 3.65749e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.759612 ( -0.67388 2.02132 )
beta : -2.01580 ( -0.28081 0.197955 )
Epeak [keV] : 46.7603 ( -15.2827 23.6308 )
Norm@50keV : 3.11456E-02 ( -0.0186712 0.80715 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.581636e-01
Photon flux (15-150 keV) in 7.872 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4634e-07 ( -5.46285e-07 -3.38189e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.59e-07
S(50-100 keV) = 1.86e-07
T90 vs. Hardness ratio plot
T90 = 6.25999999046326 sec.
Hardness ratio (energy fluence ratio) = 1.16981
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.28488
Count Ratio (50-100 keV) / (15-25 keV) = 0.698351
Mask shadow pattern
IMX = -2.956600595998222E-01, IMY = -3.219439490819969E-02
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:
-239.000000 0.244000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4840 -40.5624 2.4 32.3 -125.8 1.1421 4.7 2.1 Vela X-1
170.4363 -60.6019 5.2 33.9 -70.7 -0.6100 -2.2 3.8 Cen X-3
186.6933 -62.8212 2.3 38.4 -59.6 1.7265 4.9 3.2 GX 301-2
344.6761 -55.0981 3.5 50.7 31.5 2.6844 3.3 ------ UNKNOWN
71.5396 -26.6783 2.4 39.0 132.8 1.8365 4.9 ------ UNKNOWN
319.3029 -69.9762 2.2 44.1 7.7 1.5825 5.2 ------ UNKNOWN
134.7878 -16.0016 3.7 54.0 -143.2 3.3072 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.244000 8.116000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.2974 -40.4637 20.7 32.3 -126.1 0.0229 0.6 11.9 Vela X-1
170.4676 -60.7479 4.9 33.8 -70.5 0.1182 2.3 8.7 Cen X-3
186.8109 -62.6861 3.7 38.6 -59.7 -0.1823 -3.1 6.6 GX 301-2
352.3584 -60.6514 2.5 43.8 31.3 0.3103 4.6 ------ UNKNOWN
97.7905 -45.9037 0.3 16.6 173.8 1.0476 38.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
49.300600 963.080000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5122 -40.5575 1.6 27.8 -92.5 4.4139 7.1 0.8 Vela X-1
170.4072 -60.6195 30.6 43.3 -48.1 0.4999 0.4 2.7 Cen X-3
186.9051 -62.9440 35.3 49.9 -41.6 -0.6777 -0.3 12.4 GX 301-2
53.4305 -27.4422 2.5 39.4 97.2 6.2359 4.7 ------ UNKNOWN
75.9149 -3.5267 3.4 46.5 144.1 4.8556 3.4 ------ UNKNOWN
30.7865 -82.5624 2.9 41.6 5.2 2.6167 4.0 ------ UNKNOWN
270.6637 -76.9485 4.1 57.1 -7.0 5.0353 2.8 ------ UNKNOWN
213.9254 -68.3778 4.4 56.3 -28.5 7.0585 2.6 ------ UNKNOWN
134.2118 -5.8660 3.7 50.9 -135.5 7.3086 3.1 ------ UNKNOWN
Plot creation:
Sun May 31 11:47:48 EDT 2015