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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
121.6993 -13.9858 0.0093 38.0321 -134.6840 5.9565465 20.709 TRIG_00317888
Foreground time interval of the image:
-105.516 50.024 (delta_t = 155.540 [sec])
Background time interval of the image:
-239.600 -105.516 (delta_t = 134.084 [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 -105.516 sec. to 50.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42058 ( -0.0985692 0.0981488 )
Norm@50keV : 2.57467E-03 ( -0.000140589 0.000140526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.44 using 59 PHA bins.
# Reduced chi-squared = 0.6743 for 57 degrees of freedom
# Null hypothesis probability = 9.719174e-01
Photon flux (15-150 keV) in 155.5 sec: 0.315043 ( -0.0182096 0.0182671 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85265e-06 ( -2.27187e-07 2.28252e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -105.516 sec. to 50.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35157 ( -0.363867 0.135824 )
Epeak [keV] : 461.004 ( -739.573 -739.573 )
Norm@50keV : 2.77854E-03 ( -0.000252855 0.00126411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.45 using 59 PHA bins.
# Reduced chi-squared = 0.6867 for 56 degrees of freedom
# Null hypothesis probability = 9.646188e-01
Photon flux (15-150 keV) in 155.5 sec: 0.314128 ( -0.018788 0.018844 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84166e-06 ( -2.38786e-07 2.37993e-07 ) ergs/cm2
Band function
Time interval is from -105.516 sec. to 50.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91737 ( -5.66021 -4.91737 )
beta : -1.48959 ( -0.123445 0.110341 )
Epeak [keV] : 25.2153 ( -9.7738 3.36342 )
Norm@50keV : 208.573 ( -11.3377 1001.17 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.78 using 59 PHA bins.
# Reduced chi-squared = 0.6324 for 55 degrees of freedom
# Null hypothesis probability = 9.848778e-01
Photon flux (15-150 keV) in 155.5 sec: 0.310743 ( 6.68926 -0.018873 ) 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] : 17.3775 ( )
R^2/D10^2 : 2.12185E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 132.15 using 59 PHA bins.
# Reduced chi-squared = 2.3184 for 57 degrees of freedom
# Null hypothesis probability = 6.656013e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.017e-07 2.301e-08
25- 50 9.079e-07 7.526e-08
50-150 1.971e-06 1.850e-07
15-150 3.080e-06 2.301e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.30697 (-0.071495 0.0714858)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.88 using 59 PHA bins.
# Reduced chi-squared = 0.8050 for 57 degrees of freedom
# Null hypothesis probability = 8.540985e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.062e-07 3.320e-08
25- 50 9.737e-07 5.940e-08
50-150 2.136e-06 3.980e-07
15-150 3.616e-06 4.292e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.68217 (-0.930009 1.09079)
R1^2/D10^2 : 0.391785 (-0.163689 0.293113)
kT2 [keV] : 29.1630 (-4.00333 5.8423)
R2^2/D10^2 : 3.09518E-03 (-0.00139116 0.00203708)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.06 using 59 PHA bins.
# Reduced chi-squared = 0.5830 for 55 degrees of freedom
# Null hypothesis probability = 9.943059e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.805e-07 1.025e-07
25- 50 9.161e-07 1.482e-07
50-150 2.484e-06 4.844e-07
15-150 3.880e-06 6.772e-07
Peak spectrum fit
Power-law model
Time interval is from 3.548 sec. to 4.548 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30006 ( -0.176997 0.176604 )
Norm@50keV : 1.96657E-02 ( -0.00209386 0.00209153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.07 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.145962e-01
Photon flux (15-150 keV) in 1 sec: 2.34619 ( -0.255118 0.255563 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94329e-07 ( -2.27698e-08 2.29409e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.548 sec. to 4.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.497443 ( -0.874049 0.72741 )
Epeak [keV] : 100.433 ( -27.9815 343.185 )
Norm@50keV : 4.73573E-02 ( -0.0255862 0.0703118 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 56 degrees of freedom
# Null hypothesis probability = 1.597253e-01
Photon flux (15-150 keV) in 1 sec: 2.27348 ( -0.26536 0.26437 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86373e-07 ( -2.4243e-08 2.4343e-08 ) ergs/cm2
Band function
Time interval is from 3.548 sec. to 4.548 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.526922 ( -0.432552 0.669331 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 102.903 ( -43.847 222.549 )
Norm@50keV : 4.56615E-02 ( -0.0238188 0.0305136 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.381468e-01
Photon flux (15-150 keV) in 1 sec: 2.27705 ( ) 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] : 17.9751 (-2.16033 2.51904)
R^2/D10^2 : 0.154168 (-0.0552161 0.0835857)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.70 using 59 PHA bins.
# Reduced chi-squared = 1.346 for 57 degrees of freedom
# Null hypothesis probability = 4.200108e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.978e-09 2.060e-09
25- 50 4.610e-08 7.530e-09
50-150 1.081e-07 2.158e-08
15-150 1.641e-07 2.475e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.74648 (-1.04214 1.04208)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.77 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 57 degrees of freedom
# Null hypothesis probability = 6.688376e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.427e-08 1.342e-08
25- 50 4.668e-08 2.548e-08
50-150 1.024e-07 5.555e-08
15-150 1.733e-07 9.141e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.01479 (-2.33446 3.46483)
R1^2/D10^2 : 2.73686 (-2.12685 16.6891)
kT2 [keV] : 22.8836 (-4.03493 7.29013)
R2^2/D10^2 : 6.00217E-02 (-0.0388697 0.0522218)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.92 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 55 degrees of freedom
# Null hypothesis probability = 1.692440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.891e-08 9.657e-09
25- 50 4.413e-08 1.814e-08
50-150 1.221e-07 5.647e-08
15-150 1.851e-07 8.270e-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: 1.42058 ( -0.0985692 0.0981488 )
Norm@50keV : 2.57467E-03 ( -0.000140589 0.000140526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.44 using 59 PHA bins.
# Reduced chi-squared = 0.6743 for 57 degrees of freedom
# Null hypothesis probability = 9.719174e-01
Photon flux (15-150 keV) in 155.5 sec: 0.315043 ( -0.0182096 0.0182671 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85265e-06 ( -2.27187e-07 2.28252e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35157 ( -0.363867 0.135824 )
Epeak [keV] : 461.004 ( -739.573 -739.573 )
Norm@50keV : 2.77854E-03 ( -0.000252855 0.00126411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.45 using 59 PHA bins.
# Reduced chi-squared = 0.6867 for 56 degrees of freedom
# Null hypothesis probability = 9.646188e-01
Photon flux (15-150 keV) in 155.5 sec: 0.314128 ( -0.018788 0.018844 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84166e-06 ( -2.38786e-07 2.37993e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91737 ( -13.538 -4.91737 )
beta : -1.48959 ( -0.123445 0.110341 )
Epeak [keV] : 25.2153 ( -9.7738 3.36342 )
Norm@50keV : 208.573 ( -11.3377 1001.17 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.78 using 59 PHA bins.
# Reduced chi-squared = 0.6324 for 55 degrees of freedom
# Null hypothesis probability = 9.848778e-01
Photon flux (15-150 keV) in 155.5 sec: 0.310743 ( 6.68926 -0.018873 ) 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) = 9.15e-07
S(50-100 keV) = 1.37e-06
T90 vs. Hardness ratio plot
T90 = 92.7360000014305 sec.
Hardness ratio (energy fluence ratio) = 1.49727
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.45031
Count Ratio (50-100 keV) / (15-25 keV) = 1.26861
Mask shadow pattern
IMX = -5.500314165766547E-01, IMY = 5.561327987189398E-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:
-239.600000 -105.516000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5361 -40.5661 0.7 22.3 173.4 2.0133 16.6 0.8 Vela X-1
170.6190 -60.6993 6.1 32.1 109.1 0.4568 1.9 10.0 Cen X-3
186.7087 -62.7416 5.5 37.7 99.4 0.7990 2.1 2.2 GX 301-2
183.8097 -33.3999 2.1 21.2 46.4 0.7306 5.5 ------ UNKNOWN
168.4946 10.5909 2.6 41.0 -46.7 1.0077 4.4 ------ UNKNOWN
135.5652 4.6658 3.8 41.1 -98.2 2.1673 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-105.516000 50.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4364 -40.6276 7.1 22.4 173.3 -0.2874 -1.6 6.1 Vela X-1
170.3370 -60.4357 0.0 31.8 109.2 0.2180 0.7 11.3 Cen X-3
186.7061 -62.7109 70.8 37.6 99.3 0.0868 0.2 3.8 GX 301-2
214.4771 -20.0166 2.2 50.5 32.0 4.6692 5.3 ------ UNKNOWN
161.1943 3.4430 2.3 33.0 -57.1 1.2809 4.9 ------ UNKNOWN
121.6993 -13.9858 0.6 38.0 -134.7 5.9561 20.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
200.500600 962.462500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9770 -15.6313 0.3 20.3 81.4 25.3777 40.7 0.6 Sco X-1
254.4593 35.3413 166.4 54.9 7.9 -0.1567 -0.1 0.1 Her X-1
256.0093 -37.8598 2.2 38.4 116.3 8.1920 5.2 1.4 4U 1700-377
256.4339 -36.4230 6.6 37.9 114.1 2.6935 1.7 0.1 GX 349+2
263.0280 -24.6297 4.9 38.7 92.9 4.3025 2.4 7.0 GX 1+4
257.1748 -11.6269 2.7 32.0 71.2 3.8953 4.3 ------ UNKNOWN
210.8993 -55.8703 2.7 45.4 168.6 4.8592 4.3 ------ UNKNOWN
203.2988 34.8927 3.6 50.7 -44.5 11.9865 3.3 ------ UNKNOWN
Plot creation:
Sun May 31 06:56:03 EDT 2015