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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
129.8432 51.0155 0.0185 20.2317 130.8611 1.1069480 10.346 TRIG_00515375
Foreground time interval of the image:
-11.364 72.701 (delta_t = 84.065 [sec])
Background time interval of the image:
-721.599 -650.480 (delta_t = 71.119 [sec])
-239.000 -11.364 (delta_t = 227.636 [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)
The mask-weighted light curves based on cleaned DPHs
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 -11.364 sec. to 86.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54387 ( -0.219553 0.223385 )
Norm@50keV : 7.38466E-04 ( -0.000107211 0.000106108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.31 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 57 degrees of freedom
# Null hypothesis probability = 1.648802e-01
Photon flux (15-150 keV) in 98.19 sec: 9.33210E-02 ( -0.0126503 0.012656 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.83215e-07 ( -1.06943e-07 1.09281e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.364 sec. to 86.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.426916 ( -1.89958 1.30372 )
Epeak [keV] : 53.2360 ( -9.40777 24.8336 )
Norm@50keV : 9.28601E-03 ( -0.00928925 0.0982338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.48 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.499575e-01
Photon flux (15-150 keV) in 98.19 sec: 8.68743E-02 ( -0.0132481 0.0132967 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.64818e-07 ( -1.08682e-07 1.26079e-07 ) ergs/cm2
Band function
Time interval is from -11.364 sec. to 86.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.328548 ( -0.468817 1.02832 )
beta : -10.00000 ( 10 1.55701e-10 )
Epeak [keV] : 53.9362 ( -8.87591 11.0255 )
Norm@50keV : 8.17014E-03 ( -0.00107542 0.100164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.153409e-01
Photon flux (15-150 keV) in 98.19 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.97603e-07 ( -5.96916e-07 -1.14084e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.5688 (-1.61592 1.94389)
R^2/D10^2 : 2.06925E-02 (-0.00844237 0.0133815)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.65 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.458535e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.806e-08 1.717e-08
25- 50 2.259e-07 4.183e-08
50-150 2.211e-07 6.731e-08
15-150 5.150e-07 9.475e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 171.911 (-81.1061 -170.607)
Norm : 0.386722 (-0.0532009 0.0652858)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.53 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.301498e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.625e-08 5.292e-08
25- 50 1.818e-07 9.706e-08
50-150 3.785e-07 2.140e-07
15-150 6.566e-07 3.622e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.4580 (-10.6383 2.93065)
R1^2/D10^2 : 2.69181E-02 (-0.0314883 -0.0314883)
kT2 [keV] : 197.974 ( )
R2^2/D10^2 : 5.68298E-06 (-5.68298e-06 0.023299)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.17 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.08 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.593067e-01
# Null hypothesis probability = 3.624871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.635e-08 3.868e-08
25- 50 2.201e-07 1.274e-07
50-150 3.156e-07 1.620e-07
15-150 6.121e-07 3.096e-07
Peak spectrum fit
Power-law model
Time interval is from -2.296 sec. to -1.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37881 ( -0.644405 0.650963 )
Norm@50keV : 2.58654E-03 ( -0.0010438 0.00103323 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.28 using 59 PHA bins.
# Reduced chi-squared = 0.7769 for 57 degrees of freedom
# Null hypothesis probability = 8.905372e-01
Photon flux (15-150 keV) in 1 sec: 0.313534 ( -0.124607 0.125243 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50989e-08 ( -1.07878e-08 1.12761e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.296 sec. to -1.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.29919 ( 2.37591 3.84739 )
Epeak [keV] : 55.0457 ( -15.0867 920.139 )
Norm@50keV : 0.200386 ( -0.254704 3155.24 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.63 using 59 PHA bins.
# Reduced chi-squared = 0.7433 for 56 degrees of freedom
# Null hypothesis probability = 9.237858e-01
Photon flux (15-150 keV) in 1 sec: 0.269900 ( -0.119177 0.134395 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92202e-08 ( -8.8911e-09 1.23687e-08 ) ergs/cm2
Band function
Time interval is from -2.296 sec. to -1.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.67686 ( -1.18871 5.03405 )
beta : -10.0000 ( 10 1.35181e-11 )
Epeak [keV] : 51.9820 ( -15.8132 602.058 )
Norm@50keV : 1.02407 ( -0.376002 4.29114 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.62 using 59 PHA bins.
# Reduced chi-squared = 0.7568 for 55 degrees of freedom
# Null hypothesis probability = 9.084649e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11195e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6415 (-4.31383 7.24454)
R^2/D10^2 : 4.37840E-02 (-0.043784 0.104463)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7327 for 57 degrees of freedom
# Null hypothesis probability = 9.350962e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.972e-09 1.284e-09
25- 50 7.662e-09 4.665e-09
50-150 1.106e-08 7.720e-09
15-150 2.069e-08 1.332e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-199.363 -199.363)
Norm : 1.30641 (-0.510603 0.511062)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.99 using 59 PHA bins.
# Reduced chi-squared = 0.7718 for 57 degrees of freedom
# Null hypothesis probability = 8.965509e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.253e-09 2.042e-09
25- 50 6.258e-09 4.008e-09
50-150 1.372e-08 8.810e-09
15-150 2.323e-08 1.472e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.71710 ( )
R1^2/D10^2 : 116.039 (-112.942 2.57738e+08)
kT2 [keV] : 14.8816 (-4.5088 8.00061)
R2^2/D10^2 : 4.09004E-02 (-0.0408784 0.104737)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 41.69 using 59 PHA bins.
# Reduced chi-squared = 0.7593 for 55 degrees of freedom
# Reduced chi-squared = 0.7580 for 55 degrees of freedom
# Null hypothesis probability = 9.058544e-01
# Null hypothesis probability = 9.072466e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 1.51294 ( -0.234125 0.237554 )
Norm@50keV : 7.46714E-04 ( -0.000115431 0.000114374 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.82 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.777971e-01
Photon flux (15-150 keV) in 84.06 sec: 9.35472E-02 ( -0.0136675 0.0136734 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94264e-07 ( -9.93875e-08 1.01696e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.459405 ( -2.00286 1.33767 )
Epeak [keV] : 54.2424 ( -10.2297 28.3912 )
Norm@50keV : 9.32624E-03 ( -0.00932688 0.115047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9894 for 56 degrees of freedom
# Null hypothesis probability = 4.973299e-01
Photon flux (15-150 keV) in 84.06 sec: 8.72216E-02 ( -0.0141907 0.0142624 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91675e-07 ( -1.01261e-07 1.16771e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.380249 ( -0.752844 1.28316 )
beta : -10.00000 ( 10 7.4521e-07 )
Epeak [keV] : 54.8893 ( -9.58092 27.8113 )
Norm@50keV : 8.40083E-03 ( -0.00118802 0.117281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.590679e-01
Photon flux (15-150 keV) in 84.06 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19589e-07 ( -5.19001e-07 -1.04478e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.73e-07
S(50-100 keV) = 2.37e-07
T90 vs. Hardness ratio plot
T90 = 92.5279999375343 sec.
Hardness ratio (energy fluence ratio) = 1.36994
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.55069
Count Ratio (50-100 keV) / (15-25 keV) = 0.729274
Mask shadow pattern
IMX = -2.411198009835102E-01, IMY = -2.787382714111378E-01
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:
-721.599400 -650.480000
-239.000000 -11.364000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
76.5501 28.8829 3.6 57.0 179.1 3.5221 3.2 ------ UNKNOWN
228.8250 31.9482 3.2 56.8 0.8 3.4623 3.5 ------ UNKNOWN
98.4326 57.0835 2.3 24.9 -178.9 0.9262 5.0 ------ UNKNOWN
250.8581 53.4276 2.8 45.0 -30.4 1.4527 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-11.364000 72.700600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
189.2078 27.2642 2.5 47.9 43.5 1.9629 4.5 ------ UNKNOWN
112.0930 32.4382 2.5 42.1 143.3 1.0407 4.6 ------ UNKNOWN
129.8432 51.0155 1.1 20.2 130.9 1.1070 10.3 ------ UNKNOWN
80.6721 35.7357 1.9 49.3 178.7 1.2664 6.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
116.900600 628.300600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6139 22.0168 0.4 46.0 -168.3 18.2018 31.0 1.1 Crab
104.2183 2.3103 2.8 53.3 155.8 6.5802 4.1 ------ UNKNOWN
117.2764 23.0045 2.7 29.7 147.0 1.7135 4.2 ------ UNKNOWN
223.8587 49.9020 3.8 55.5 -5.6 2.8176 3.0 ------ UNKNOWN
84.7749 18.9502 2.4 47.7 -172.0 2.9025 4.8 ------ UNKNOWN
56.0742 53.0839 2.7 43.3 -114.0 6.7535 4.3 ------ UNKNOWN
48.9130 67.4575 3.9 40.8 -92.1 4.4689 3.0 ------ UNKNOWN
58.7986 41.5446 2.7 48.0 -129.0 5.6309 4.2 ------ UNKNOWN
Plot creation:
Sat May 30 20:16:13 EDT 2015