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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
322.6360 14.8961 0.0173 20.1491 111.8494 1.1290962 11.096 TRIG_00601662
Foreground time interval of the image:
-3.284 55.676 (delta_t = 58.960 [sec])
Background time interval of the image:
-239.936 -3.284 (delta_t = 236.652 [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 16.384000
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 16.384000
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 16.384000
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 -3.284 sec. to 55.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05480 ( -0.242162 0.26344 )
Norm@50keV : 1.07003E-03 ( -0.000191719 0.000186348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.93 using 59 PHA bins.
# Reduced chi-squared = 0.9636 for 57 degrees of freedom
# Null hypothesis probability = 5.532161e-01
Photon flux (15-150 keV) in 58.96 sec: 0.164685 ( -0.0214734 0.0214734 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83872e-07 ( -9.41756e-08 9.73152e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.284 sec. to 55.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.946240 ( -1.49028 0.817867 )
Epeak [keV] : 38.7567 ( )
Norm@50keV : 4.75793E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9310 for 56 degrees of freedom
# Null hypothesis probability = 6.218533e-01
Photon flux (15-150 keV) in 58.96 sec: 0.158814 ( -0.022115 0.022192 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30184e-07 ( -9.45211e-08 1.07775e-07 ) ergs/cm2
Band function
Time interval is from -3.284 sec. to 55.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.946420 ( -0.95915 1.70235 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 38.7512 ( -9.47633 25.4482 )
Norm@50keV : 4.75634E-03 ( -0.00475651 0.0311153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9479 for 55 degrees of freedom
# Null hypothesis probability = 5.847067e-01
Photon flux (15-150 keV) in 58.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30432e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.95637 (-1.32571 1.52125)
R^2/D10^2 : 7.96786E-02 (-0.0335407 0.0578562)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.248488e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.470e-08 2.205e-08
25- 50 2.340e-07 4.012e-08
50-150 1.206e-07 4.192e-08
15-150 4.493e-07 8.532e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.9857 (-18.3997 32.5239)
Norm : 0.874722 (-0.172338 0.214683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.42 using 59 PHA bins.
# Reduced chi-squared = 0.9197 for 57 degrees of freedom
# Null hypothesis probability = 6.471589e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.293e-07 2.282e-08
25- 50 1.957e-07 3.237e-08
50-150 2.195e-07 8.305e-08
15-150 5.445e-07 1.073e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.35327 (-1.18 2.29004)
R1^2/D10^2 : 25.8445 (-25.1592 12092.2)
kT2 [keV] : 11.5517 (-1.86185 2.84213)
R2^2/D10^2 : 4.11906E-02 (-0.0252655 0.027467)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.52 using 59 PHA bins.
# Reduced chi-squared = 0.9005 for 55 degrees of freedom
# Null hypothesis probability = 6.830626e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.215e-07 4.939e-08
25- 50 2.083e-07 7.992e-08
50-150 1.604e-07 7.345e-08
15-150 4.902e-07 1.666e-07
Peak spectrum fit
Power-law model
Time interval is from 6.928 sec. to 7.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80184 ( -0.651967 0.721411 )
Norm@50keV : 3.67202E-03 ( -0.00158419 0.00143481 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9515 for 57 degrees of freedom
# Null hypothesis probability = 5.793410e-01
Photon flux (15-150 keV) in 1 sec: 0.506358 ( -0.161649 0.161649 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38021e-08 ( -1.35688e-08 1.46824e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.928 sec. to 7.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83406 ( -1.29614 0.695199 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 3.58116E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.25 using 59 PHA bins.
# Reduced chi-squared = 0.9687 for 56 degrees of freedom
# Null hypothesis probability = 5.415274e-01
Photon flux (15-150 keV) in 1 sec: 0.506025 ( -0.161571 0.161562 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33962e-08 ( -3.33962e-08 1.49731e-08 ) ergs/cm2
Band function
Time interval is from 6.928 sec. to 7.928 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96925 ( -4.96925 -4.96925 )
beta : -2.15867 ( -3.60465 0.884904 )
Epeak [keV] : 24.4676 ( -24.4676 8.76741 )
Norm@50keV : 614.895 ( -194.442 6.25894e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.73 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 55 degrees of freedom
# Null hypothesis probability = 5.230952e-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] : 7.15186 (-2.05605 3.48734)
R^2/D10^2 : 0.843533 (-0.843408 2.44704)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.13 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.703951e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.084e-09 4.305e-09
25- 50 1.011e-08 6.295e-09
50-150 1.809e-09 1.591e-09
15-150 1.900e-08 1.184e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 106.323 (-106.294 -106.294)
Norm : 2.17947 (-0.802116 2.24226)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.17 using 59 PHA bins.
# Reduced chi-squared = 0.9678 for 57 degrees of freedom
# Null hypothesis probability = 5.441413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.695e-09 3.531e-09
25- 50 9.966e-09 6.135e-09
50-150 1.671e-08 1.254e-08
15-150 3.237e-08 2.123e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17571 (-1.82249 2.47365)
R1^2/D10^2 : 1.38090 (-1.04385 4.13348)
kT2 [keV] : 159.068 (-158.711 -158.711)
R2^2/D10^2 : 1.26901E-04 (-9.06056e-05 0.00605843)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.9087 for 55 degrees of freedom
# Null hypothesis probability = 6.663335e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.414e-09 4.564e-09
25- 50 8.804e-09 5.280e-09
50-150 2.554e-08 5.335e-09
15-150 4.176e-08 1.340e-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: 2.05480 ( -0.242162 0.26344 )
Norm@50keV : 1.07003E-03 ( -0.000191719 0.000186348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.93 using 59 PHA bins.
# Reduced chi-squared = 0.9636 for 57 degrees of freedom
# Null hypothesis probability = 5.532161e-01
Photon flux (15-150 keV) in 58.96 sec: 0.164685 ( -0.0214734 0.0214734 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83872e-07 ( -9.41756e-08 9.73152e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.946240 ( -1.49028 0.817867 )
Epeak [keV] : 38.7567 ( )
Norm@50keV : 4.75793E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9310 for 56 degrees of freedom
# Null hypothesis probability = 6.218533e-01
Photon flux (15-150 keV) in 58.96 sec: 0.158814 ( -0.022115 0.022192 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30184e-07 ( -9.45211e-08 1.07775e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.946420 ( -0.958063 1.70235 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 38.7512 ( -9.47633 25.4482 )
Norm@50keV : 4.75634E-03 ( -0.00475651 0.0311153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9479 for 55 degrees of freedom
# Null hypothesis probability = 5.847067e-01
Photon flux (15-150 keV) in 58.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30432e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.79e-07
S(50-100 keV) = 1.72e-07
T90 vs. Hardness ratio plot
T90 = 49.8719999194145 sec.
Hardness ratio (energy fluence ratio) = 0.960894
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08089
Count Ratio (50-100 keV) / (15-25 keV) = 0.439557
Mask shadow pattern
IMX = -1.365559274131149E-01, IMY = -3.405622276047429E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
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:
-239.936000 -3.284000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6037 35.2009 1.3 43.5 147.1 5.2074 8.6 0.7 Cyg X-1
308.0906 40.9639 3.2 39.3 158.9 1.4372 3.6 1.1 Cyg X-3
326.1802 38.1588 13.3 26.8 171.2 0.1924 0.9 9.8 Cyg X-2
348.1354 -28.7665 3.0 45.1 16.8 1.5232 3.9 ------ UNKNOWN
333.0485 -0.0235 2.2 19.2 56.1 1.2143 5.2 ------ UNKNOWN
357.2748 -26.3206 2.3 44.5 4.8 1.7691 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.284000 55.676000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6385 35.2033 4.9 43.4 147.1 0.5786 2.4 2.4 Cyg X-1
308.1002 40.7514 7.9 39.2 158.6 -0.2212 -1.5 12.1 Cyg X-3
326.0575 38.4424 11.9 27.1 171.4 0.0966 1.0 9.0 Cyg X-2
322.6360 14.8961 1.0 20.1 111.8 1.1290 11.1 ------ UNKNOWN
296.2171 62.7380 2.5 56.9 178.8 2.4376 4.6 ------ UNKNOWN
358.5949 -13.8842 2.2 33.5 -4.7 0.5700 5.2 ------ UNKNOWN
20.4564 -26.1890 2.6 55.5 -18.3 1.2941 4.3 ------ UNKNOWN
21.1069 -5.8838 1.9 43.2 -39.9 1.0273 6.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
114.564580 962.097400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8101 10.9509 0.6 33.2 119.5 20.7546 18.4 0.8 GRS 1915+105
299.5887 35.2025 0.3 29.0 170.9 25.4872 39.0 0.1 Cyg X-1
308.1329 40.9619 1.3 28.9 -170.8 5.4914 9.2 1.2 Cyg X-3
326.1003 38.1466 9.6 23.4 -140.9 0.7087 1.2 11.0 Cyg X-2
293.1212 -11.6990 3.7 39.6 81.6 8.0152 3.1 ------ UNKNOWN
Plot creation:
Sat May 30 13:19:58 EDT 2015