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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
357.0736 -17.9079 0.0107 44.9616 -165.3545 2.5995885 17.889 TRIG_00217704
Foreground time interval of the image:
-48.956 25.444 (delta_t = 74.400 [sec])
Background time interval of the image:
-239.800 -48.956 (delta_t = 190.844 [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 4.096000
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 4.096000
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 4.096000
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 -48.956 sec. to 25.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67201 ( -0.125111 0.126973 )
Norm@50keV : 2.45783E-03 ( -0.000195506 0.000194676 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.33 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 57 degrees of freedom
# Null hypothesis probability = 8.296464e-02
Photon flux (15-150 keV) in 74.4 sec: 0.323300 ( -0.0255946 0.0256493 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69714e-06 ( -1.40756e-07 1.41518e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -48.956 sec. to 25.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.424012 ( -0.673985 0.587303 )
Epeak [keV] : 61.9489 ( -8.23547 15.0161 )
Norm@50keV : 1.06466E-02 ( -0.00522032 0.0125386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.32 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.260018e-01
Photon flux (15-150 keV) in 74.4 sec: 0.307189 ( -0.026495 0.026584 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57746e-06 ( -1.48956e-07 1.51196e-07 ) ergs/cm2
Band function
Time interval is from -48.956 sec. to 25.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.423921 ( -0.578139 0.645523 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 61.9367 ( -7.7213 15.0192 )
Norm@50keV : 1.06483E-02 ( -0.00522567 0.0125542 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.32 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 55 degrees of freedom
# Null hypothesis probability = 3.891830e-01
Photon flux (15-150 keV) in 74.4 sec: 0.309270 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58018e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7791 (-1.14164 1.25053)
R^2/D10^2 : 4.97232E-02 (-0.0136631 0.0186169)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.08 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.452628e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.486e-07 2.053e-08
25- 50 5.438e-07 4.814e-08
50-150 6.743e-07 1.056e-07
15-150 1.367e-06 1.261e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 137.878 (-36.9814 55.2005)
Norm : 1.35294 (-0.121463 0.146489)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.48 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.586263e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.602e-07 2.946e-08
25- 50 4.762e-07 7.087e-08
50-150 9.068e-07 3.968e-07
15-150 1.643e-06 3.906e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.75232 (-2.06578 2.20447)
R1^2/D10^2 : 0.216130 (-0.111456 0.350168)
kT2 [keV] : 20.9561 (-4.02567 7.69177)
R2^2/D10^2 : 7.48460E-03 (-0.00569039 0.012083)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.81 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.443169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.168e-07 1.109e-07
25- 50 5.198e-07 2.308e-07
50-150 8.437e-07 4.197e-07
15-150 1.580e-06 7.026e-07
Peak spectrum fit
Power-law model
Time interval is from 3.052 sec. to 4.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67716 ( -0.357896 0.372798 )
Norm@50keV : 8.18457E-03 ( -0.00180886 0.0017647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.46 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.885874e-01
Photon flux (15-150 keV) in 1 sec: 1.07848 ( -0.226382 0.226941 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.59241e-08 ( -1.73294e-08 1.75719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.052 sec. to 4.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68530 ( -0.366306 0.368728 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 8.16411E-03 ( -0.00818526 0.0303393 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.46 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 56 degrees of freedom
# Null hypothesis probability = 2.576046e-01
Photon flux (15-150 keV) in 1 sec: 1.07821 ( -0.226105 0.22549 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58201e-08 ( -1.78804e-08 1.75656e-08 ) ergs/cm2
Band function
Time interval is from 3.052 sec. to 4.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.70278 ( -4.70278 -4.70278 )
beta : -1.78617 ( -0.487729 0.408512 )
Epeak [keV] : 24.2086 ( -24.2086 38.144 )
Norm@50keV : 749.481 ( -152.744 7.90998e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.92 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.428122e-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] : 12.2046 (-3.6121 5.39677)
R^2/D10^2 : 0.241794 (-0.175134 0.633378)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.12 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.559194e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.627e-09 3.414e-09
25- 50 2.448e-08 1.110e-08
50-150 2.217e-08 1.207e-08
15-150 5.428e-08 2.033e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 172.741 (-106.045 -170.755)
Norm : 4.36036 (-0.929917 1.53183)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.745084e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.105e-08 6.505e-09
25- 50 2.088e-08 1.145e-08
50-150 4.355e-08 2.526e-08
15-150 7.547e-08 4.352e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.87579 (-2.29408 3.07784)
R1^2/D10^2 : 1.58365 (-1.16452 5.75263)
kT2 [keV] : 33.9305 (-29.3509 -33.9308)
R2^2/D10^2 : 5.09446E-03 (-0.00499702 0.0356919)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.03 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 55 degrees of freedom
# Null hypothesis probability = 2.682357e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.265e-08 7.435e-09
25- 50 2.109e-08 1.153e-08
50-150 4.450e-08 2.651e-08
15-150 7.823e-08 3.963e-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: 1.67201 ( -0.125111 0.126973 )
Norm@50keV : 2.45783E-03 ( -0.000195506 0.000194676 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.33 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 57 degrees of freedom
# Null hypothesis probability = 8.296464e-02
Photon flux (15-150 keV) in 74.4 sec: 0.323300 ( -0.0255946 0.0256493 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69714e-06 ( -1.40756e-07 1.41518e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.424012 ( -0.673985 0.587303 )
Epeak [keV] : 61.9489 ( -8.23547 15.0161 )
Norm@50keV : 1.06466E-02 ( -0.00522032 0.0125386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.32 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.260018e-01
Photon flux (15-150 keV) in 74.4 sec: 0.307189 ( -0.026495 0.026584 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57746e-06 ( -1.48956e-07 1.51196e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.423921 ( -0.578139 0.645523 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 61.9367 ( -7.7213 15.0192 )
Norm@50keV : 1.06483E-02 ( -0.00522567 0.0125542 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.32 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 55 degrees of freedom
# Null hypothesis probability = 3.891830e-01
Photon flux (15-150 keV) in 74.4 sec: 0.309270 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58018e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.54e-07
S(50-100 keV) = 5.70e-07
T90 vs. Hardness ratio plot
T90 = 66.6440000236034 sec.
Hardness ratio (energy fluence ratio) = 1.25551
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.66989
Count Ratio (50-100 keV) / (15-25 keV) = 1.11569
Mask shadow pattern
IMX = -9.662121362301983E-01, IMY = 2.524985327476902E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.800000 -48.956000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.8385 -62.7268 7.8 58.8 -15.3 -1.2544 -1.5 5.6 GX 301-2
255.9957 -37.8192 2.2 46.3 44.0 3.2784 5.3 1.6 4U 1700-377
256.4960 -36.5438 6.0 46.8 45.6 -1.2710 -1.9 7.8 GX 349+2
264.7796 -44.3755 5.4 37.0 42.2 0.5443 2.1 4.7 4U 1735-44
275.8500 -30.4773 6.8 39.5 68.6 0.8708 1.7 7.7 H1820-303
285.1124 -24.8757 12.6 38.9 84.3 -0.4739 -0.9 4.9 HT1900.1-2455
296.0959 -17.5720 2.5 40.4 103.9 2.3850 4.6 ------ UNKNOWN
331.5966 -6.5799 3.2 47.3 156.5 1.4140 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-48.956000 25.444000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.7665 -62.7247 3.5 58.8 -15.4 1.8204 3.3 4.1 GX 301-2
256.0671 -37.7830 4.3 46.2 44.1 1.0157 2.7 5.3 4U 1700-377
256.5913 -36.4514 4.4 46.8 45.8 1.0647 2.6 7.7 GX 349+2
264.5662 -44.5155 28.6 37.1 41.9 0.0717 0.4 8.5 4U 1735-44
276.0261 -30.4873 4.8 39.4 68.7 -0.7590 -2.4 8.9 H1820-303
284.9967 -24.7686 9.6 39.0 84.2 0.4001 1.2 9.4 HT1900.1-2455
357.0736 -17.9079 0.6 45.0 -165.4 2.5990 17.9 ------ UNKNOWN
165.0948 -68.6738 2.2 57.0 -27.8 2.5489 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
104.500620 962.260900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
8.2863 -36.4493 3.1 21.0 -8.6 1.3105 3.7 ------ UNKNOWN
353.3383 40.9895 3.8 59.0 -166.1 8.5184 3.0 ------ UNKNOWN
23.2472 0.0436 3.9 31.3 -105.0 1.5494 2.9 ------ UNKNOWN
Plot creation:
Sun May 31 12:44:24 EDT 2015