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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
149.7242 -59.7609 0.0149 14.8469 63.4179 0.7075377 13.025 TRIG_00292826
Foreground time interval of the image:
-0.044 30.565 (delta_t = 30.609 [sec])
Background time interval of the image:
-197.835 -0.044 (delta_t = 197.791 [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 2.048000
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 2.048000
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 2.048000
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 -0.044 sec. to 61.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67437 ( -0.152868 0.156142 )
Norm@50keV : 1.37033E-03 ( -0.000129148 0.000127463 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.47 using 59 PHA bins.
# Reduced chi-squared = 0.7451 for 57 degrees of freedom
# Null hypothesis probability = 9.241716e-01
Photon flux (15-150 keV) in 61.84 sec: 0.180397 ( -0.0153045 0.0153123 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.86302e-07 ( -7.83401e-08 7.94848e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 61.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35593 ( -0.353242 0.501659 )
Epeak [keV] : 92.2191 ( -36.65 -92.2194 )
Norm@50keV : 2.04137E-03 ( -0.000775164 0.00254658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.59 using 59 PHA bins.
# Reduced chi-squared = 0.7427 for 56 degrees of freedom
# Null hypothesis probability = 9.244095e-01
Photon flux (15-150 keV) in 61.84 sec: 0.177730 ( -0.01605 0.016015 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60669e-07 ( -9.08368e-08 9.16098e-08 ) ergs/cm2
Band function
Time interval is from -0.044 sec. to 61.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13224 ( 1.12464 1.12464 )
beta : -1.87035 ( 1.87396 0.319601 )
Epeak [keV] : 63.4756 ( -62.8384 -62.8384 )
Norm@50keV : 2.84752E-03 ( -0.00162209 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.41 using 59 PHA bins.
# Reduced chi-squared = 0.7530 for 55 degrees of freedom
# Null hypothesis probability = 9.123972e-01
Photon flux (15-150 keV) in 61.84 sec: 0.177769 ( 6.82223 -0.016012 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.63285e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2554 (-1.30041 1.50007)
R^2/D10^2 : 4.01401E-02 (-0.0137666 0.0203894)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.94 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 57 degrees of freedom
# Null hypothesis probability = 8.782464e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.897e-08 1.249e-08
25- 50 2.547e-07 2.551e-08
50-150 2.332e-07 4.570e-08
15-150 5.669e-07 5.958e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 138.847 (-46.1927 -137.411)
Norm : 0.748322 (-0.0721105 0.0927268)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.64 using 59 PHA bins.
# Reduced chi-squared = 0.7306 for 57 degrees of freedom
# Null hypothesis probability = 9.368373e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.196e-07 1.490e-08
25- 50 2.191e-07 4.208e-08
50-150 4.184e-07 1.862e-07
15-150 7.570e-07 2.229e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.56215 (-1.86657 2.0285)
R1^2/D10^2 : 0.258032 (-0.148439 0.584004)
kT2 [keV] : 23.5761 (-6.17212 14.4165)
R2^2/D10^2 : 2.84974E-03 (-0.00229595 0.00639855)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.31 using 59 PHA bins.
# Reduced chi-squared = 0.7693 for 55 degrees of freedom
# Null hypothesis probability = 8.948478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.202e-07 4.824e-08
25- 50 2.202e-07 6.737e-08
50-150 4.161e-07 2.181e-07
15-150 7.566e-07 2.808e-07
Peak spectrum fit
Power-law model
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86537 ( -0.234082 0.25023 )
Norm@50keV : 6.03364E-03 ( -0.00105962 0.00103747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.72 using 59 PHA bins.
# Reduced chi-squared = 0.8899 for 57 degrees of freedom
# Null hypothesis probability = 7.081593e-01
Photon flux (15-150 keV) in 1 sec: 0.853441 ( -0.121288 0.121288 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54682e-08 ( -9.52344e-09 9.81395e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.91260E-02 ( -1.68693 1.21388 )
Epeak [keV] : 43.8207 ( -8.13588 15.5624 )
Norm@50keV : 6.54339E-02 ( -0.0654339 0.605887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7819 for 56 degrees of freedom
# Null hypothesis probability = 8.821914e-01
Photon flux (15-150 keV) in 1 sec: 0.819009 ( -0.121592 0.12226 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.80908e-08 ( -9.0354e-09 1.0274e-08 ) ergs/cm2
Band function
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.174625 ( -1.13721 0.983693 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 44.3786 ( -8.68862 15.0786 )
Norm@50keV : 5.84269E-02 ( -0.0584744 6.5425 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.80 using 59 PHA bins.
# Reduced chi-squared = 0.7964 for 55 degrees of freedom
# Null hypothesis probability = 8.611376e-01
Photon flux (15-150 keV) in 1 sec: 0.819019 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.80847e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5274 (-1.46077 1.71484)
R^2/D10^2 : 0.353704 (-0.153454 0.263838)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.50 using 59 PHA bins.
# Reduced chi-squared = 0.8157 for 57 degrees of freedom
# Null hypothesis probability = 8.384389e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.108e-09 1.799e-09
25- 50 2.164e-08 4.535e-09
50-150 1.308e-08 4.613e-09
15-150 4.283e-08 8.510e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.0633 (-26.2176 52.8542)
Norm : 4.15872 (-0.772266 0.941151)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8148 for 57 degrees of freedom
# Null hypothesis probability = 8.399021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-08 2.160e-09
25- 50 1.748e-08 2.930e-09
50-150 2.384e-08 1.366e-08
15-150 5.207e-08 1.498e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.44911 (-6.44876 -6.44911)
R1^2/D10^2 : 1.07719 (-1.04413 -1.07719)
kT2 [keV] : 14.8937 (-14.8934 -14.8937)
R2^2/D10^2 : 6.53155E-02 (-0.0653116 0.327389)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.73 using 59 PHA bins.
# Reduced chi-squared = 0.7950 for 55 degrees of freedom
# Null hypothesis probability = 8.629859e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.593e-09 5.345e-09
25- 50 1.961e-08 9.655e-09
50-150 1.897e-08 1.105e-08
15-150 4.817e-08 2.523e-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: 1.57848 ( -0.199863 0.204709 )
Norm@50keV : 1.43206E-03 ( -0.000182316 0.000179975 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.77 using 59 PHA bins.
# Reduced chi-squared = 0.7855 for 57 degrees of freedom
# Null hypothesis probability = 8.801314e-01
Photon flux (15-150 keV) in 30.61 sec: 0.182821 ( -0.0215014 0.0215109 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11065e-07 ( -5.63548e-08 5.73919e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.763144 ( -0.97898 0.806308 )
Epeak [keV] : 70.9561 ( -18.1111 509.287 )
Norm@50keV : 3.89156E-03 ( -0.00240607 0.00864958 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7460 for 56 degrees of freedom
# Null hypothesis probability = 9.213149e-01
Photon flux (15-150 keV) in 30.61 sec: 0.177015 ( -0.02227 0.022257 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83029e-07 ( -6.03292e-08 6.31637e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.764384 ( -0.731183 0.895755 )
beta : -9.37167 ( 9.37149 19.3715 )
Epeak [keV] : 71.9804 ( -20.7283 407.981 )
Norm@50keV : 3.84356E-03 ( -0.000446057 0.00349154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7597 for 55 degrees of freedom
# Null hypothesis probability = 9.054734e-01
Photon flux (15-150 keV) in 30.61 sec: 0.177217 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.87388e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.11e-07
S(50-100 keV) = 2.64e-07
T90 vs. Hardness ratio plot
T90 = 57.4280000030994 sec.
Hardness ratio (energy fluence ratio) = 1.25118
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.21286
Count Ratio (50-100 keV) / (15-25 keV) = 0.772291
Mask shadow pattern
IMX = 1.186208010585904E-01, IMY = -2.370653090943753E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-197.835400 -0.044000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5379 -40.4036 0.5 18.8 141.7 3.8106 24.3 9.1 Vela X-1
170.2465 -60.6890 6.1 15.6 23.9 0.2725 1.9 4.5 Cen X-3
186.6560 -62.7707 22.8 22.2 9.8 0.0734 0.5 0.0 GX 301-2
202.2847 -47.5535 2.5 28.4 -29.5 0.6898 4.7 ------ UNKNOWN
180.3431 -21.8092 2.0 29.4 -97.0 1.1912 5.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.044000 30.564620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5845 -40.4364 2.2 18.8 141.7 -0.3221 -5.3 7.5 Vela X-1
170.0550 -60.5435 9.2 15.4 24.0 -0.0720 -1.2 9.0 Cen X-3
187.0843 -62.7109 98.0 22.3 9.4 0.0068 0.1 12.3 GX 301-2
268.9651 -86.3950 2.4 45.0 37.6 0.8611 4.9 ------ UNKNOWN
149.7243 -59.7609 0.9 14.8 63.4 0.7076 13.0 ------ UNKNOWN
154.0211 -19.6628 2.1 27.1 -150.5 0.3313 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
71.364610 962.724000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5303 -40.4455 0.3 21.3 -163.9 14.5250 34.8 6.6 Vela X-1
170.4664 -60.8216 0.0 10.3 -27.9 -0.9957 -2.1 12.7 Cen X-3
186.5808 -62.6650 3.4 17.7 -17.5 1.3129 3.3 6.7 GX 301-2
124.9698 -9.3419 2.4 53.7 -163.7 5.8509 4.8 ------ UNKNOWN
201.2593 -42.9741 2.4 35.1 -47.8 2.9011 4.9 ------ UNKNOWN
189.8649 -33.6022 4.2 37.0 -69.7 3.3368 2.7 ------ UNKNOWN
139.5342 -5.0666 6.2 55.2 -145.3 6.3355 1.9 ------ UNKNOWN
152.6242 -11.8984 2.6 47.9 -129.1 8.8594 4.5 ------ UNKNOWN
207.1411 -31.2923 3.2 47.1 -53.6 7.6491 3.6 ------ UNKNOWN
Plot creation:
Sun May 31 09:11:49 EDT 2015