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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
276.5696 47.1044 0.0215 31.7026 8.6013 1.1692195 8.936 TRIG_00297114
Foreground time interval of the image:
-29.412 55.692 (delta_t = 85.104 [sec])
Background time interval of the image:
-239.000 -29.412 (delta_t = 209.588 [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 64.000000
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 64.000000
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 64.000000
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 -29.412 sec. to 55.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62212 ( -0.297102 0.308146 )
Norm@50keV : 7.76377E-04 ( -0.000142727 0.000139601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.42 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 57 degrees of freedom
# Null hypothesis probability = 6.045512e-02
Photon flux (15-150 keV) in 85.1 sec: 0.100464 ( -0.0171165 0.0171417 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.16298e-07 ( -1.1964e-07 1.22001e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -29.412 sec. to 55.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42008 ( -1.22892 0.500191 )
Epeak [keV] : 138.835 ( -138.836 -138.836 )
Norm@50keV : 9.90854E-04 ( -0.000990853 0.00320361 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.31 using 59 PHA bins.
# Reduced chi-squared = 1.327 for 56 degrees of freedom
# Null hypothesis probability = 5.130064e-02
Photon flux (15-150 keV) in 85.1 sec: 9.96799E-02 ( -0.0172091 0.0175351 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0712e-07 ( -1.28793e-07 1.28681e-07 ) ergs/cm2
Band function
Time interval is from -29.412 sec. to 55.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35901 ( -0.521808 1.17385 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 122.302 ( -72.4887 -123.125 )
Norm@50keV : 1.05924E-03 ( -0.000410697 0.00137525 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.32 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Null hypothesis probability = 4.235774e-02
Photon flux (15-150 keV) in 85.1 sec: 9.94426E-02 ( ) 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] : 13.9695 (-3.02179 3.90404)
R^2/D10^2 : 1.41579E-02 (-0.00822719 0.0196228)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.54 using 59 PHA bins.
# Reduced chi-squared = 1.483 for 57 degrees of freedom
# Null hypothesis probability = 1.037168e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.968e-08 1.674e-08
25- 50 1.844e-07 5.944e-08
50-150 2.366e-07 8.472e-08
15-150 4.707e-07 1.391e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 165.381 (-86.5732 -165.381)
Norm : 0.412378 (-0.0732745 0.094859)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.38 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.086140e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.931e-08 5.004e-08
25- 50 1.678e-07 9.178e-08
50-150 3.444e-07 1.983e-07
15-150 6.015e-07 3.399e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.96128 (-2.07495 3.97878)
R1^2/D10^2 : 0.394275 (-0.344869 4.47007)
kT2 [keV] : 21.5445 (-6.30795 18.8104)
R2^2/D10^2 : 2.58665E-03 (-0.00230459 0.00667834)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.89 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 55 degrees of freedom
# Null hypothesis probability = 4.550091e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.818e-08 5.727e-08
25- 50 1.504e-07 7.914e-08
50-150 3.474e-07 2.044e-07
15-150 5.959e-07 2.810e-07
Peak spectrum fit
Power-law model
Time interval is from 2.996 sec. to 3.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30029 ( -0.85848 1.2781 )
Norm@50keV : 2.35046E-03 ( -0.00235018 0.00149808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.91 using 59 PHA bins.
# Reduced chi-squared = 0.7353 for 57 degrees of freedom
# Null hypothesis probability = 9.328582e-01
Photon flux (15-150 keV) in 1 sec: 0.410825 ( -0.15896 0.158865 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24608e-08 ( -1.13843e-08 1.29822e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.996 sec. to 3.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82033 ( )
Epeak [keV] : 19.1204 ( )
Norm@50keV : 4.13741E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.41 using 59 PHA bins.
# Reduced chi-squared = 0.7573 for 56 degrees of freedom
# Null hypothesis probability = 9.101344e-01
Photon flux (15-150 keV) in 1 sec: 0.410515 ( -0.158481 0.15772 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20947e-08 ( -1.24568e-08 1.28764e-08 ) ergs/cm2
Band function
Time interval is from 2.996 sec. to 3.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67539 ( 1.67544 1.67544 )
beta : -2.29985 ( 2.30034 0.858089 )
Epeak [keV] : 5.28152 ( -5.28065 -5.28065 )
Norm@50keV : 1.18751E-02 ( -0.0118789 21938.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.91 using 59 PHA bins.
# Reduced chi-squared = 0.7621 for 55 degrees of freedom
# Null hypothesis probability = 9.029122e-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] : 5.31615 (-2.17189 5.26586)
R^2/D10^2 : 2.31640 (-2.30781 26.834)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.62 using 59 PHA bins.
# Reduced chi-squared = 0.7828 for 57 degrees of freedom
# Null hypothesis probability = 8.834472e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.155e-09 4.371e-09
25- 50 5.420e-09 3.615e-09
50-150 2.940e-10 3.077e-10
15-150 1.287e-08 8.770e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.1784 (-39.497 -39.497)
Norm : 2.62941 (-1.5221 10.4276)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.01 using 59 PHA bins.
# Reduced chi-squared = 0.7546 for 57 degrees of freedom
# Null hypothesis probability = 9.149634e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.995e-09 3.881e-09
25- 50 7.816e-09 4.895e-09
50-150 5.910e-09 4.736e-09
15-150 1.972e-08 1.361e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.40775 (-2.03885 3.33152)
R1^2/D10^2 : 4.90898 (-4.48995 118.879)
kT2 [keV] : 35.8026 (-26.8383 -35.8026)
R2^2/D10^2 : 1.52146E-03 (-0.00148359 0.0111645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.72 using 59 PHA bins.
# Reduced chi-squared = 0.7404 for 55 degrees of freedom
# Null hypothesis probability = 9.244640e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.281e-09 4.607e-09
25- 50 5.102e-09 2.755e-09
50-150 1.490e-08 1.005e-08
15-150 2.728e-08 1.491e-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: 1.62212 ( -0.297102 0.308146 )
Norm@50keV : 7.76377E-04 ( -0.000142727 0.000139601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.42 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 57 degrees of freedom
# Null hypothesis probability = 6.045512e-02
Photon flux (15-150 keV) in 85.1 sec: 0.100464 ( -0.0171165 0.0171417 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.16298e-07 ( -1.1964e-07 1.22001e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42008 ( -1.22892 0.500191 )
Epeak [keV] : 138.835 ( -138.836 -138.836 )
Norm@50keV : 9.90854E-04 ( -0.000990853 0.00320361 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.31 using 59 PHA bins.
# Reduced chi-squared = 1.327 for 56 degrees of freedom
# Null hypothesis probability = 5.130064e-02
Photon flux (15-150 keV) in 85.1 sec: 9.96799E-02 ( -0.0172091 0.0175351 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0712e-07 ( -1.28793e-07 1.28681e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35901 ( -0.521808 1.17385 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 122.302 ( -72.4887 -123.125 )
Norm@50keV : 1.05924E-03 ( -0.000410697 0.00137525 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.32 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Null hypothesis probability = 4.235774e-02
Photon flux (15-150 keV) in 85.1 sec: 9.94426E-02 ( ) 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) = 1.61e-07
S(50-100 keV) = 2.10e-07
T90 vs. Hardness ratio plot
T90 = 71.4320000112057 sec.
Hardness ratio (energy fluence ratio) = 1.30435
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.732702
Count Ratio (50-100 keV) / (15-25 keV) = 0.703142
Mask shadow pattern
IMX = 6.107290638466494E-01, IMY = -9.237778843154515E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-239.000000 -29.412000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4343 35.3363 5.1 41.1 -22.1 0.6089 2.3 1.2 Her X-1
268.2106 -1.4381 5.8 37.2 -85.6 1.2414 2.0 9.5 SW J1753.5-0127
289.0081 10.9282 118.4 13.5 -98.2 0.0168 0.1 12.4 GRS 1915+105
299.5897 35.2089 0.2 14.4 41.0 8.6110 49.6 0.4 Cyg X-1
308.1183 40.9532 1.4 21.6 57.5 1.7786 8.4 0.4 Cyg X-3
326.1564 38.2976 11.2 29.4 85.3 0.3250 1.0 1.6 Cyg X-2
272.2755 40.0772 2.1 29.5 -5.9 1.0891 5.4 ------ UNKNOWN
237.2281 37.2250 4.2 55.1 -20.8 1.6251 2.7 ------ UNKNOWN
270.9032 -9.8290 4.0 41.0 -98.2 3.0913 2.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-29.412000 55.692000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6453 35.3765 11.2 41.0 -22.0 -0.1681 -1.0 9.4 Her X-1
268.5130 -1.4534 3.2 36.9 -85.9 -0.9260 -3.6 8.7 SW J1753.5-0127
288.9318 10.8652 17.0 13.6 -98.1 0.0707 0.7 9.2 GRS 1915+105
299.6473 35.3812 3.2 14.5 41.1 -0.4064 -3.6 11.1 Cyg X-1
308.2679 41.0391 14.0 21.8 57.7 0.1071 0.8 8.8 Cyg X-3
326.1047 38.2495 6.7 29.4 85.3 -0.3166 -1.7 5.4 Cyg X-2
276.5694 47.1043 1.3 31.7 8.6 1.1594 8.9 ------ UNKNOWN
318.8791 -21.8620 2.1 47.1 -168.4 1.0257 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
126.500600 963.070000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4598 35.5046 11.7 20.1 -64.9 0.5736 1.0 9.7 Her X-1
288.9486 10.9937 7.6 37.6 -148.0 -1.1181 -1.5 9.3 GRS 1915+105
299.5978 35.2062 0.2 20.9 168.5 34.1714 70.6 0.5 Cyg X-1
308.1256 41.0125 1.1 23.3 145.6 5.6041 10.1 3.7 Cyg X-3
326.0687 38.1968 3.9 36.8 137.7 2.8088 2.9 8.9 Cyg X-2
308.1064 37.6548 1.5 24.9 152.8 4.4089 7.9 ------ UNKNOWN
307.7713 -3.5061 2.9 57.5 -165.6 10.0210 4.0 ------ UNKNOWN
Plot creation:
Sun May 31 08:36:03 EDT 2015