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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
197.0925 -58.9960 0.0247 31.9036 56.9179 0.7316770 7.790 TRIG_00566545
Foreground time interval of the image:
-28.056 2.584 (delta_t = 30.640 [sec])
Background time interval of the image:
-173.123 -28.056 (delta_t = 145.067 [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)
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 -28.056 sec. to 2.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86083 ( -0.326303 0.352225 )
Norm@50keV : 1.51609E-03 ( -0.000344144 0.000331347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7418 for 57 degrees of freedom
# Null hypothesis probability = 9.271984e-01
Photon flux (15-150 keV) in 30.64 sec: 0.214047 ( -0.0394332 0.0394411 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27076e-07 ( -9.37857e-08 9.6948e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.056 sec. to 2.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51606 ( -1.8106 0.69066 )
Epeak [keV] : 58.8958 ( )
Norm@50keV : 2.40479E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.08 using 59 PHA bins.
# Reduced chi-squared = 0.7515 for 56 degrees of freedom
# Null hypothesis probability = 9.160276e-01
Photon flux (15-150 keV) in 30.64 sec: 0.211625 ( -0.04059 0.020208 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11219e-07 ( -1.09822e-07 1.09342e-07 ) ergs/cm2
Band function
Time interval is from -28.056 sec. to 2.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.70457 ( -4.05271 -4.05271 )
beta : -2.09043 ( -0.720883 0.485399 )
Epeak [keV] : 28.0435 ( -25.6999 43.8638 )
Norm@50keV : 0.559719 ( -0.542147 94.059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.34 using 59 PHA bins.
# Reduced chi-squared = 0.7516 for 55 degrees of freedom
# Null hypothesis probability = 9.137868e-01
Photon flux (15-150 keV) in 30.64 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] : 9.98600 (-2.02022 2.62826)
R^2/D10^2 : 0.101617 (-0.0597107 0.138133)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.83 using 59 PHA bins.
# Reduced chi-squared = 0.8392 for 57 degrees of freedom
# Null hypothesis probability = 8.012923e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.320e-08 2.306e-08
25- 50 1.568e-07 5.057e-08
50-150 8.152e-08 3.788e-08
15-150 3.016e-07 8.837e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.2868 (-38.2304 -83.2868)
Norm : 0.996375 (-0.242795 0.342459)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.12 using 59 PHA bins.
# Reduced chi-squared = 0.7390 for 57 degrees of freedom
# Null hypothesis probability = 9.296615e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.940e-08 2.016e-08
25- 50 1.320e-07 3.387e-08
50-150 1.913e-07 1.434e-07
15-150 4.027e-07 1.582e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.18985 (-3.38768 3.20189)
R1^2/D10^2 : 0.284006 ( )
kT2 [keV] : 30.8536 (-18.0641 -30.9184)
R2^2/D10^2 : 1.03985E-03 (-0.00100746 0.00352197)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 41.40 using 59 PHA bins.
# Reduced chi-squared = 0.7591 for 55 degrees of freedom
# Reduced chi-squared = 0.7527 for 55 degrees of freedom
# Null hypothesis probability = 9.061138e-01
# Null hypothesis probability = 9.126569e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.997e-08 4.777e-08
25- 50 1.281e-07 7.079e-08
50-150 1.816e-07 1.181e-07
15-150 3.897e-07 2.107e-07
Peak spectrum fit
Power-law model
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03768 ( -0.264669 0.290397 )
Norm@50keV : 1.01512E-02 ( -0.00208255 0.00202655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.29 using 59 PHA bins.
# Reduced chi-squared = 0.9349 for 57 degrees of freedom
# Null hypothesis probability = 6.151634e-01
Photon flux (15-150 keV) in 1 sec: 1.54966 ( -0.247024 0.247042 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.38261e-08 ( -1.76553e-08 1.8144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40199E-02 ( -1.94661 1.47051 )
Epeak [keV] : 39.9878 ( -9.69258 10.963 )
Norm@50keV : 0.153083 ( -0.153942 1.98102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.41 using 59 PHA bins.
# Reduced chi-squared = 0.8467 for 56 degrees of freedom
# Null hypothesis probability = 7.861517e-01
Photon flux (15-150 keV) in 1 sec: 1.49126 ( -0.24722 0.24851 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32941e-08 ( -1.59547e-08 1.79789e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.85010E-02 ( 1.17714 1.24674 )
beta : -10.00000 ( 10 4.38316e-11 )
Epeak [keV] : 39.9373 ( -7.58367 8.77264 )
Norm@50keV : 0.144641 ( -0.0224373 2.0001 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.42 using 59 PHA bins.
# Reduced chi-squared = 0.8621 for 55 degrees of freedom
# Null hypothesis probability = 7.564631e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.41046e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.2253 (-1.49944 1.69239)
R^2/D10^2 : 0.718102 (-0.321337 0.589599)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.28 using 59 PHA bins.
# Reduced chi-squared = 0.8646 for 57 degrees of freedom
# Null hypothesis probability = 7.564122e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.540e-08 3.905e-09
25- 50 3.951e-08 9.470e-09
50-150 2.199e-08 8.985e-09
15-150 7.689e-08 1.851e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.1316 (-19.698 36.3658)
Norm : 8.37731 (-1.88068 2.34773)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.46 using 59 PHA bins.
# Reduced chi-squared = 0.8678 for 57 degrees of freedom
# Null hypothesis probability = 7.506098e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.100e-08 4.165e-09
25- 50 3.182e-08 6.340e-09
50-150 3.577e-08 1.521e-08
15-150 8.860e-08 2.173e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.57241 (-3.57238 -3.57238)
R1^2/D10^2 : 14.8409 (-14.8414 -14.8414)
kT2 [keV] : 11.6237 (-2.19214 -11.6237)
R2^2/D10^2 : 0.392483 (-0.392485 0.6032)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.91 using 59 PHA bins.
# Reduced chi-squared = 0.8530 for 55 degrees of freedom
# Null hypothesis probability = 7.727685e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.877e-08 9.520e-09
25- 50 3.583e-08 2.014e-08
50-150 2.693e-08 1.648e-08
15-150 8.153e-08 4.351e-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: 1.86083 ( -0.326303 0.352225 )
Norm@50keV : 1.51609E-03 ( -0.000344144 0.000331347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7418 for 57 degrees of freedom
# Null hypothesis probability = 9.271984e-01
Photon flux (15-150 keV) in 30.64 sec: 0.214047 ( -0.0394332 0.0394411 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27076e-07 ( -9.37857e-08 9.6948e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51606 ( -1.8106 0.690717 )
Epeak [keV] : 58.8958 ( )
Norm@50keV : 2.40479E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.08 using 59 PHA bins.
# Reduced chi-squared = 0.7515 for 56 degrees of freedom
# Null hypothesis probability = 9.160276e-01
Photon flux (15-150 keV) in 30.64 sec: 0.211625 ( -0.04059 0.020208 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11219e-07 ( -1.09822e-07 1.09342e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.70457 ( -4.05271 -4.05271 )
beta : -2.09043 ( -0.720883 0.485399 )
Epeak [keV] : 28.0435 ( -25.6999 43.8638 )
Norm@50keV : 0.559719 ( -0.542147 94.0766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.34 using 59 PHA bins.
# Reduced chi-squared = 0.7516 for 55 degrees of freedom
# Null hypothesis probability = 9.137868e-01
Photon flux (15-150 keV) in 30.64 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) = 1.23e-07
S(50-100 keV) = 1.35e-07
T90 vs. Hardness ratio plot
T90 = 29.9759999513626 sec.
Hardness ratio (energy fluence ratio) = 1.09756
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37615
Count Ratio (50-100 keV) / (15-25 keV) = 0.639211
Mask shadow pattern
IMX = 3.398025988801988E-01, IMY = -5.216129614581994E-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:
-173.123400 -28.056000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3921 -40.6430 4.1 16.0 176.7 0.3614 2.8 8.2 Vela X-1
170.2382 -60.7338 3.8 22.6 78.6 0.4728 3.1 7.0 Cen X-3
186.6366 -62.8398 14.5 29.2 68.3 0.1728 0.8 4.2 GX 301-2
218.9505 -46.1651 2.7 45.0 36.0 1.5587 4.2 ------ UNKNOWN
201.4108 -42.9886 2.2 33.5 26.8 0.9031 5.2 ------ UNKNOWN
217.0647 -21.3700 2.4 54.3 5.5 2.4602 4.8 ------ UNKNOWN
103.9059 -37.1720 2.3 40.6 172.8 1.0130 5.0 ------ UNKNOWN
170.1121 -19.7567 2.5 23.3 -49.2 0.6094 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-28.056000 2.584000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.7474 -40.4302 0.0 15.8 177.6 0.0724 1.3 12.5 Vela X-1
170.5005 -60.7506 15.9 22.7 78.4 -0.0542 -0.7 9.4 Cen X-3
186.4147 -62.6665 6.4 29.0 68.1 0.1759 1.8 9.1 GX 301-2
197.0925 -58.9960 1.5 31.9 56.9 0.7315 7.8 ------ UNKNOWN
120.0820 -49.9102 2.0 27.3 152.6 0.4003 5.8 ------ UNKNOWN
126.2284 -46.8593 2.1 22.9 158.5 0.3234 5.4 ------ UNKNOWN
168.4530 -42.7892 2.1 9.5 28.4 0.2934 5.5 ------ UNKNOWN
130.3905 -35.5095 2.1 20.9 -170.0 0.3108 5.6 ------ UNKNOWN
108.9797 -19.7803 2.3 45.1 -161.5 0.4556 5.0 ------ UNKNOWN
181.3620 2.8403 2.3 48.4 -49.3 1.2053 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
71.676590 962.391500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6399 -40.5476 4.3 41.9 -132.1 2.7684 2.7 5.1 Vela X-1
170.3036 -60.6061 1.4 13.5 -148.6 3.7007 8.4 1.1 Cen X-3
186.7711 -62.7819 1.5 6.3 -171.9 3.5075 7.7 3.2 GX 301-2
255.7849 -37.7071 24.8 42.6 46.9 0.6127 0.5 12.6 4U 1700-377
256.5922 -36.4384 5.6 44.0 46.4 2.8799 2.1 7.6 GX 349+2
214.4944 -35.4575 3.1 26.1 -6.4 1.7838 3.7 ------ UNKNOWN
219.0863 -27.3205 2.8 35.1 -4.7 2.3962 4.1 ------ UNKNOWN
201.4250 -42.9310 2.3 16.2 -28.7 2.2406 5.1 ------ UNKNOWN
193.6641 -8.2507 3.9 50.7 -44.4 8.0538 3.0 ------ UNKNOWN
169.2766 -22.9333 2.9 41.1 -80.9 8.9605 4.0 ------ UNKNOWN
Plot creation:
Sat May 30 15:53:20 EDT 2015