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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.0698 -3.7556 0.0101 30.4540 -2.3920 2.6736791 18.952 TRIG_00148225
Foreground time interval of the image:
-57.268 56.653 (delta_t = 113.921 [sec])
Background time interval of the image:
-254.347 -57.268 (delta_t = 197.079 [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 12.160000
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 12.160000
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 12.160000
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 -57.268 sec. to 120.516 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51150 ( -0.107183 0.107704 )
Norm@50keV : 1.40350E-03 ( -8.21461e-05 8.19085e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.27 using 59 PHA bins.
# Reduced chi-squared = 0.6714 for 57 degrees of freedom
# Null hypothesis probability = 9.732177e-01
Photon flux (15-150 keV) in 177.8 sec: 0.175759 ( -0.0104412 0.01047 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36289e-06 ( -1.51448e-07 1.52362e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -57.268 sec. to 120.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50899 ( -0.350844 0.140634 )
Epeak [keV] : 9998.94 ( )
Norm@50keV : 1.40760E-03 ( -0.000302741 0.000723257 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.27 using 59 PHA bins.
# Reduced chi-squared = 0.6834 for 56 degrees of freedom
# Null hypothesis probability = 9.663365e-01
Photon flux (15-150 keV) in 177.8 sec: 0.175708 ( -0.010919 0.010407 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36207e-06 ( -1.62438e-07 1.52055e-07 ) ergs/cm2
Band function
Time interval is from -57.268 sec. to 120.516 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25715 ( 1.25715 1.25715 )
beta : -1.51150 ( -0.107763 0.107193 )
Epeak [keV] : 29.7962 ( -29.7945 -29.7945 )
Norm@50keV : 2.71178E-03 ( -0.00103241 0.198927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.27 using 59 PHA bins.
# Reduced chi-squared = 0.6958 for 55 degrees of freedom
# Null hypothesis probability = 9.580391e-01
Photon flux (15-150 keV) in 177.8 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] : 15.6876 ( )
R^2/D10^2 : 1.63504E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.61 using 59 PHA bins.
# Reduced chi-squared = 2.2037 for 57 degrees of freedom
# Null hypothesis probability = 4.485649e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.486e-07 1.845e-08
25- 50 6.145e-07 4.907e-08
50-150 1.049e-06 1.265e-07
15-150 1.812e-06 1.285e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.713750 (-0.0409716 0.0409718)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.89 using 59 PHA bins.
# Reduced chi-squared = 0.7174 for 57 degrees of freedom
# Null hypothesis probability = 9.469324e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.170e-07 2.187e-08
25- 50 6.098e-07 4.214e-08
50-150 1.337e-06 2.041e-07
15-150 2.264e-06 2.596e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.49455 (-1.0437 1.1627)
R1^2/D10^2 : 0.246357 (-0.10953 0.231237)
kT2 [keV] : 27.4867 (-4.15024 6.2033)
R2^2/D10^2 : 1.97585E-03 (-0.000972438 0.00153221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.66 using 59 PHA bins.
# Reduced chi-squared = 0.6666 for 55 degrees of freedom
# Null hypothesis probability = 9.729840e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.165e-07 7.877e-08
25- 50 5.814e-07 1.026e-07
50-150 1.468e-06 3.553e-07
15-150 2.365e-06 4.186e-07
Peak spectrum fit
Power-law model
Time interval is from 5.028 sec. to 6.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31635 ( -0.456998 0.449044 )
Norm@50keV : 4.67045E-03 ( -0.00113779 0.00113356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.16 using 59 PHA bins.
# Reduced chi-squared = 0.7396 for 57 degrees of freedom
# Null hypothesis probability = 9.291146e-01
Photon flux (15-150 keV) in 1 sec: 0.558909 ( -0.138336 0.138817 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59714e-08 ( -1.24924e-08 1.27402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.028 sec. to 6.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03349 ( )
Epeak [keV] : 12.7795 ( )
Norm@50keV : 1.68317E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.06 using 59 PHA bins.
# Reduced chi-squared = 0.7511 for 56 degrees of freedom
# Null hypothesis probability = 9.164035e-01
Photon flux (15-150 keV) in 1 sec: 0.559811 ( -0.139469 0.137631 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57962e-08 ( -1.25146e-08 1.28127e-08 ) ergs/cm2
Band function
Time interval is from 5.028 sec. to 6.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.15232 ( 0.943446 0.943446 )
beta : -1.34621 ( 1.32517 0.46455 )
Epeak [keV] : 23.9971 ( -68.5501 -68.5501 )
Norm@50keV : 21.2109 ( -21.1685 496.41 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.14 using 59 PHA bins.
# Reduced chi-squared = 0.7661 for 55 degrees of freedom
# Null hypothesis probability = 8.984764e-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] : 18.1116 (-6.32038 10.4239)
R^2/D10^2 : 3.34203E-02 (-0.0252965 0.107549)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.75 using 59 PHA bins.
# Reduced chi-squared = 0.8553 for 57 degrees of freedom
# Null hypothesis probability = 7.734433e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.191e-09 1.384e-09
25- 50 1.018e-08 4.962e-09
50-150 2.427e-08 1.399e-08
15-150 3.664e-08 2.218e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-103.123 -199.363)
Norm : 2.30306 (-0.562853 0.562869)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7592 for 57 degrees of freedom
# Null hypothesis probability = 9.103049e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.735e-09 3.452e-09
25- 50 1.103e-08 6.590e-09
50-150 2.419e-08 1.414e-08
15-150 4.096e-08 2.417e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.94213 (-3.3643 5.33274)
R1^2/D10^2 : 0.631558 (-0.544543 1.30648)
kT2 [keV] : 37.2373 (-33.6588 -37.2373)
R2^2/D10^2 : 2.88066E-03 (-0.00281037 0.014932)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.47 using 59 PHA bins.
# Reduced chi-squared = 0.7541 for 55 degrees of freedom
# Null hypothesis probability = 9.113044e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.390e-09 3.207e-09
25- 50 1.015e-08 5.720e-09
50-150 3.261e-08 1.808e-08
15-150 4.815e-08 2.534e-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: 1.45322 ( -0.118116 0.118375 )
Norm@50keV : 1.65553E-03 ( -0.000106819 0.000106458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.14 using 59 PHA bins.
# Reduced chi-squared = 0.7392 for 57 degrees of freedom
# Null hypothesis probability = 9.294569e-01
Photon flux (15-150 keV) in 113.9 sec: 0.204185 ( -0.013507 0.0135452 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80337e-06 ( -1.27934e-07 1.28685e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45220 ( -0.394801 0.117966 )
Epeak [keV] : 9998.92 ( -9999.34 -9999.34 )
Norm@50keV : 1.65702E-03 ( -0.000106927 0.000878126 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.14 using 59 PHA bins.
# Reduced chi-squared = 0.7526 for 56 degrees of freedom
# Null hypothesis probability = 9.149203e-01
Photon flux (15-150 keV) in 113.9 sec: 0.204204 ( -0.013598 0.013343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79759e-06 ( -1.30769e-07 1.3627e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22109 ( 1.22109 1.22109 )
beta : -1.45322 ( -0.118384 0.118123 )
Epeak [keV] : 25.8267 ( -25.8267 -25.8267 )
Norm@50keV : 3.22395E-03 ( -0.00125064 0.236255 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.14 using 59 PHA bins.
# Reduced chi-squared = 0.7661 for 55 degrees of freedom
# Null hypothesis probability = 8.984608e-01
Photon flux (15-150 keV) in 113.9 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) = 5.88e-07
S(50-100 keV) = 8.25e-07
T90 vs. Hardness ratio plot
T90 = 154.600000023842 sec.
Hardness ratio (energy fluence ratio) = 1.40306
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.31036
Count Ratio (50-100 keV) / (15-25 keV) = 1.0086
Mask shadow pattern
IMX = 5.874521859743349E-01, IMY = 2.453893817882704E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
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:
-254.347410 -57.268000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5301 -40.5709 1.1 51.5 -145.5 4.7397 10.2 1.0 Vela X-1
170.1230 -60.5415 10.5 34.6 179.0 -0.2112 -1.1 7.5 Cen X-3
186.5798 -62.9268 3.3 32.0 164.9 0.6300 3.5 9.6 GX 301-2
244.9661 -15.6617 1.3 43.8 52.3 5.3775 9.0 1.5 Sco X-1
135.5268 -70.2380 3.2 51.5 176.4 1.5049 3.6 ------ UNKNOWN
166.6520 -29.9514 2.4 28.6 -121.3 0.7788 4.7 ------ UNKNOWN
194.7124 13.3726 2.6 45.7 -33.9 1.3257 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-57.268000 56.652590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5178 -40.5899 2.5 51.5 -145.5 -1.9811 -4.7 2.2 Vela X-1
170.0558 -60.6639 7.1 34.7 178.9 0.2513 1.6 8.0 Cen X-3
186.7211 -62.9377 15.8 32.0 164.8 -0.1070 -0.7 10.2 GX 301-2
245.0555 -15.7930 8.2 43.9 52.6 -0.7162 -1.4 10.2 Sco X-1
212.0698 -3.7556 0.6 30.5 -2.4 2.6738 19.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
106.452600 302.218200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9961 -15.6317 0.7 34.5 93.5 5.8330 16.2 1.1 Sco X-1
234.7295 3.9216 2.2 23.9 52.6 0.8749 5.2 ------ UNKNOWN
212.0519 -3.8109 1.7 0.1 -164.3 0.9251 6.8 ------ UNKNOWN
183.7376 5.8206 3.0 29.9 -90.4 0.8200 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 16:13:28 EDT 2015