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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
191.4943 -7.1752 0.0136 10.1190 -48.1709 0.2632532 14.219 TRIG_00509419
Foreground time interval of the image:
-2.328 0.360 (delta_t = 2.688 [sec])
Background time interval of the image:
-239.848 -2.328 (delta_t = 237.520 [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 0.256000
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 0.256000
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 0.256000
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)
The mask-weighted light curves based on cleaned DPHs
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 -2.328 sec. to 0.360 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29672 ( -0.194316 0.193882 )
Norm@50keV : 6.17146E-03 ( -0.0006915 0.000689334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.14 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.297087e-01
Photon flux (15-150 keV) in 2.688 sec: 0.735828 ( -0.082068 0.0821284 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6406e-07 ( -2.09219e-08 2.1191e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.328 sec. to 0.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03317 ( -0.83299 0.432527 )
Epeak [keV] : 186.076 ( -186.076 -186.076 )
Norm@50keV : 8.37288E-03 ( -0.00354553 0.012993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.75 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 56 degrees of freedom
# Null hypothesis probability = 3.086161e-01
Photon flux (15-150 keV) in 2.688 sec: 0.727836 ( -0.08513 0.084845 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60633e-07 ( -2.33162e-08 2.3123e-08 ) ergs/cm2
Band function
Time interval is from -2.328 sec. to 0.360 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.786016 ( 0.87548 0.87548 )
beta : -1.43146 ( 1.42733 0.306771 )
Epeak [keV] : 97.9370 ( -96.3363 -96.3363 )
Norm@50keV : 1.20237E-02 ( -0.00671646 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.798388e-01
Photon flux (15-150 keV) in 2.688 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] : 16.4798 (-2.34969 2.86653)
R^2/D10^2 : 6.26664E-02 (-0.0261153 0.0429131)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.01 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 57 degrees of freedom
# Null hypothesis probability = 3.987532e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.393e-09 2.114e-09
25- 50 4.052e-08 6.263e-09
50-150 7.776e-08 1.671e-08
15-150 1.277e-07 1.956e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.01338 (-0.335541 0.335524)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.17 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.137989e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.017e-08 1.137e-08
25- 50 3.881e-08 2.111e-08
50-150 8.512e-08 4.664e-08
15-150 1.441e-07 7.939e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.23759 (-3.46997 3.68947)
R1^2/D10^2 : 0.401037 (-0.259987 1.96649)
kT2 [keV] : 31.7261 (-11.0712 65.6281)
R2^2/D10^2 : 5.58479E-03 (-0.00528696 0.0205135)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.15 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 55 degrees of freedom
# Null hypothesis probability = 2.647206e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.579e-08 8.768e-09
25- 50 3.925e-08 1.988e-08
50-150 1.071e-07 5.871e-08
15-150 1.622e-07 8.039e-08
Peak spectrum fit
Power-law model
Time interval is from -2.330 sec. to -1.330 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23598 ( -0.229384 0.227381 )
Norm@50keV : 8.69517E-03 ( -0.00116985 0.00116695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.52 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 57 degrees of freedom
# Null hypothesis probability = 1.410398e-01
Photon flux (15-150 keV) in 1 sec: 1.02611 ( -0.139129 0.139297 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.73462e-08 ( -1.32123e-08 1.33863e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.330 sec. to -1.330 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.480585 ( -1.28898 0.853161 )
Epeak [keV] : 103.419 ( -36.8784 -103.408 )
Norm@50keV : 2.05032E-02 ( -0.0124899 0.0650614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.87 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 56 degrees of freedom
# Null hypothesis probability = 1.515804e-01
Photon flux (15-150 keV) in 1 sec: 0.995289 ( -0.073741 0.145671 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.25621e-08 ( -1.49219e-08 1.49493e-08 ) ergs/cm2
Band function
Time interval is from -2.330 sec. to -1.330 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.236322 ( 0.219108 5.18766 )
beta : -1.73920 ( 1.74481 0.631883 )
Epeak [keV] : 84.3703 ( -80.933 310.168 )
Norm@50keV : 2.83894E-02 ( -0.0311635 94.5116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.61 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.357184e-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] : 16.9493 (-2.5316 3.19923)
R^2/D10^2 : 8.25409E-02 (-0.0364513 0.0602945)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.16 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.502977e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.833e-09 1.292e-09
25- 50 2.133e-08 4.610e-09
50-150 4.372e-08 1.045e-08
15-150 6.988e-08 1.346e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.20936 (-0.570651 0.570622)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.56 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 57 degrees of freedom
# Null hypothesis probability = 8.018637e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.048e-08 5.945e-09
25- 50 2.016e-08 1.137e-08
50-150 4.422e-08 2.454e-08
15-150 7.487e-08 4.193e-08
Double BB
R1^2/D10^2 : 0.217832 (-3001.92 96648.4)
kT2 [keV] : 38.0766 ( )
R2^2/D10^2 : 3.66399E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.67 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.11 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.09 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Reduced chi-squared = 1.220 for 55 degrees of freedom
# Reduced chi-squared = 1.220 for 55 degrees of freedom
# Null hypothesis probability = 1.173010e-01
# Null hypothesis probability = 1.267523e-01
# Null hypothesis probability = 1.271262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.256e-09 1.714e-09
25- 50 1.982e-08 4.445e-09
50-150 4.640e-08 1.341e-08
15-150 7.248e-08 1.540e-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: 1.29672 ( -0.194316 0.193882 )
Norm@50keV : 6.17146E-03 ( -0.0006915 0.000689334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.14 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.297087e-01
Photon flux (15-150 keV) in 2.688 sec: 0.735828 ( -0.082068 0.0821284 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6406e-07 ( -2.09219e-08 2.1191e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03317 ( -0.83299 0.432527 )
Epeak [keV] : 186.076 ( -186.076 -186.076 )
Norm@50keV : 8.37288E-03 ( -0.00354553 0.012993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.75 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 56 degrees of freedom
# Null hypothesis probability = 3.086161e-01
Photon flux (15-150 keV) in 2.688 sec: 0.727836 ( -0.08513 0.084845 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60633e-07 ( -2.33162e-08 2.3123e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.786016 ( 0.87548 0.87548 )
beta : -1.43146 ( 1.42733 0.306771 )
Epeak [keV] : 97.9370 ( -96.3363 -96.3363 )
Norm@50keV : 1.20237E-02 ( -0.00671646 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.798388e-01
Photon flux (15-150 keV) in 2.688 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) = 3.64e-08
S(50-100 keV) = 5.93e-08
T90 vs. Hardness ratio plot
T90 = 2.51599991321564 sec.
Hardness ratio (energy fluence ratio) = 1.62912
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.38604
Count Ratio (50-100 keV) / (15-25 keV) = 1.17691
Mask shadow pattern
IMX = 1.190234813146320E-01, IMY = 1.329845045493814E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.848000 -2.328000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
180.3176 -6.8980 2.5 11.3 14.3 0.8486 4.7 ------ UNKNOWN
192.8264 6.6337 2.4 7.2 -153.3 0.8076 4.8 ------ UNKNOWN
210.2682 -44.2971 3.8 50.7 -44.7 3.1236 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.328000 0.360000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
209.3342 52.2980 2.0 53.6 173.2 0.4292 5.8 ------ UNKNOWN
191.4942 -7.1752 0.8 10.1 -48.2 0.2633 14.2 ------ UNKNOWN
233.9461 35.0845 2.1 54.5 -156.4 0.3323 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
44.652590 962.210500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3003 -60.6236 16.1 55.8 -9.4 1.3699 0.7 0.5 Cen X-3
186.6688 -62.7692 297.2 55.7 -19.1 0.0792 0.0 0.3 GX 301-2
166.9109 -24.7469 2.2 29.3 28.6 3.4793 5.3 ------ UNKNOWN
208.4637 12.9108 2.5 26.2 -161.7 2.5006 4.7 ------ UNKNOWN
231.4221 38.8740 3.5 59.1 -166.1 13.4366 3.3 ------ UNKNOWN
221.9707 -13.3847 5.4 30.6 -97.6 1.7340 2.1 ------ UNKNOWN
214.3201 -58.0153 3.3 53.8 -36.5 11.0310 3.5 ------ UNKNOWN
220.5732 -51.8065 4.3 50.6 -44.7 8.6689 2.7 ------ UNKNOWN
235.1439 -2.1297 3.1 43.8 -116.2 8.9034 3.8 ------ UNKNOWN
Plot creation:
Sat May 30 20:55:38 EDT 2015