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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
322.9566 2.8915 0.0111 31.8761 177.1278 1.8654981 17.267 TRIG_00211117
Foreground time interval of the image:
0.164 73.101 (delta_t = 72.937 [sec])
Background time interval of the image:
-239.000 0.164 (delta_t = 239.164 [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 0.164 sec. to 77.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53701 ( -0.148746 0.150573 )
Norm@50keV : 1.55070E-03 ( -0.000139417 0.000138496 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.74 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 1.998362e-01
Photon flux (15-150 keV) in 77.16 sec: 0.195578 ( -0.0168926 0.0169089 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12872e-06 ( -1.1081e-07 1.11821e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.164 sec. to 77.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.698574 ( -0.837202 0.688214 )
Epeak [keV] : 73.3082 ( -16.8141 110.887 )
Norm@50keV : 4.27250E-03 ( -0.00238145 0.00739319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.30 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 56 degrees of freedom
# Null hypothesis probability = 2.916255e-01
Photon flux (15-150 keV) in 77.16 sec: 0.187915 ( -0.018154 0.018055 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04326e-06 ( -1.29058e-07 1.31704e-07 ) ergs/cm2
Band function
Time interval is from 0.164 sec. to 77.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.37164E-02 ( -1.20159 1.87723 )
beta : -2.01884 ( 2.00871 0.375859 )
Epeak [keV] : 53.6750 ( -13.4655 53.5255 )
Norm@50keV : 1.17306E-02 ( -0.0121818 0.160387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.84 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.044187e-01
Photon flux (15-150 keV) in 77.16 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05715e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5770 (-1.28082 1.45699)
R^2/D10^2 : 3.16285E-02 (-0.00967208 0.0134972)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.11 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 57 degrees of freedom
# Null hypothesis probability = 5.422411e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.525e-08 1.408e-08
25- 50 3.434e-07 3.804e-08
50-150 4.102e-07 7.566e-08
15-150 8.489e-07 8.989e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.008 (-76.02 -198.946)
Norm : 0.798903 (-0.0680966 0.077127)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.02 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.718382e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.535e-07 3.958e-08
25- 50 2.953e-07 1.159e-07
50-150 6.472e-07 3.357e-07
15-150 1.096e-06 5.274e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.0077 ( )
R1^2/D10^2 : 7.14481E-02 (-0.0317549 0.086261)
kT2 [keV] : 36.5830 (-16.9808 -38.4025)
R2^2/D10^2 : 5.82800E-04 (-0.000425848 0.00170061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.66 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.83 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 1.539482e-01
# Null hypothesis probability = 2.742050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.364e-07 4.853e-08
25- 50 3.098e-07 5.104e-08
50-150 4.722e-07 9.687e-08
15-150 9.184e-07 1.388e-07
Peak spectrum fit
Power-law model
Time interval is from 4.408 sec. to 5.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92669 ( -0.4612 0.525245 )
Norm@50keV : 3.70260E-03 ( -0.00129636 0.00124296 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.93 using 59 PHA bins.
# Reduced chi-squared = 0.8058 for 57 degrees of freedom
# Null hypothesis probability = 8.528986e-01
Photon flux (15-150 keV) in 1 sec: 0.537486 ( -0.14655 0.14655 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40551e-08 ( -1.10769e-08 1.17451e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.408 sec. to 5.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.196691 ( -4.30321 2.36365 )
Epeak [keV] : 40.2040 ( -40.0097 -40.0097 )
Norm@50keV : 6.99458E-02 ( -0.0924331 31.8644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.97 using 59 PHA bins.
# Reduced chi-squared = 0.7852 for 56 degrees of freedom
# Null hypothesis probability = 8.781009e-01
Photon flux (15-150 keV) in 1 sec: 0.508031 ( -0.144933 0.146936 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82343e-08 ( -8.906e-09 1.26267e-08 ) ergs/cm2
Band function
Time interval is from 4.408 sec. to 5.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.499086 ( -1.28712 -1.28712 )
beta : -4.54695 ( 4.62547 12.3523 )
Epeak [keV] : 40.0723 ( -39.8219 14.5044 )
Norm@50keV : 0.104954 ( -0.0606566 95.2825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.90 using 59 PHA bins.
# Reduced chi-squared = 0.7982 for 55 degrees of freedom
# Null hypothesis probability = 8.586798e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9114e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1495 (-2.3938 3.05589)
R^2/D10^2 : 0.256379 (-0.164089 0.446345)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.25 using 59 PHA bins.
# Reduced chi-squared = 0.7763 for 57 degrees of freedom
# Null hypothesis probability = 8.913278e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.405e-09 2.970e-09
25- 50 1.372e-08 7.182e-09
50-150 7.475e-09 4.782e-09
15-150 2.660e-08 1.415e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.8414 (-34.0363 -65.8409)
Norm : 2.75692 (-0.965629 1.49284)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.92 using 59 PHA bins.
# Reduced chi-squared = 0.7880 for 57 degrees of freedom
# Null hypothesis probability = 8.769112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.023e-09 3.134e-09
25- 50 1.099e-08 6.827e-09
50-150 1.347e-08 1.148e-08
15-150 3.148e-08 2.022e-08
Double BB
R1^2/D10^2 : 2.29325E-05 ( )
kT2 [keV] : 9.66963 (-9.65942 3.07954)
R2^2/D10^2 : 0.294911 (-0.297112 -0.297112)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.83 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.71 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.58 using 59 PHA bins.
# Reduced chi-squared = 0.7970 for 55 degrees of freedom
# Reduced chi-squared = 0.7947 for 55 degrees of freedom
# Reduced chi-squared = 0.7923 for 55 degrees of freedom
# Null hypothesis probability = 8.603705e-01
# Null hypothesis probability = 8.633564e-01
# Null hypothesis probability = 8.666110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.128e-09 3.140e-09
25- 50 1.287e-08 7.715e-09
50-150 8.639e-09 5.915e-09
15-150 2.763e-08 1.543e-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: 1.52876 ( -0.150393 0.152362 )
Norm@50keV : 1.59282E-03 ( -0.000143546 0.000142578 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.380959e-01
Photon flux (15-150 keV) in 72.94 sec: 0.200424 ( -0.0174104 0.017428 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09715e-06 ( -1.08066e-07 1.09339e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.795553 ( -0.797921 0.664862 )
Epeak [keV] : 78.7960 ( -19.9044 239.976 )
Norm@50keV : 3.82596E-03 ( -0.00206774 0.00598328 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.43 using 59 PHA bins.
# Reduced chi-squared = 0.9720 for 56 degrees of freedom
# Null hypothesis probability = 5.344039e-01
Photon flux (15-150 keV) in 72.94 sec: 0.193416 ( -0.018654 0.018561 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02693e-06 ( -1.24501e-07 1.26514e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.363165 ( -0.883643 1.73832 )
beta : -1.91647 ( 1.91978 0.364054 )
Epeak [keV] : 59.1910 ( -24.8824 120.693 )
Norm@50keV : 7.11306E-03 ( -0.00757413 0.0895426 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9797 for 55 degrees of freedom
# Null hypothesis probability = 5.173044e-01
Photon flux (15-150 keV) in 72.94 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03935e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.84e-07
S(50-100 keV) = 3.92e-07
T90 vs. Hardness ratio plot
T90 = 69.1240000128746 sec.
Hardness ratio (energy fluence ratio) = 1.38028
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.62605
Count Ratio (50-100 keV) / (15-25 keV) = 0.971263
Mask shadow pattern
IMX = -6.210847846077263E-01, IMY = -3.116077551905699E-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 0.164000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.4426 -39.8369 2.4 29.3 71.4 1.2879 4.8 ------ UNKNOWN
323.4684 3.5706 2.8 32.4 178.4 0.7951 4.1 ------ UNKNOWN
344.6202 -22.2876 3.2 12.8 -98.6 0.6362 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.164000 73.100600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
322.9566 2.8915 0.7 31.9 177.1 1.8655 17.3 ------ UNKNOWN
339.8633 20.7092 2.8 49.1 -156.0 0.8951 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
125.900600 963.092000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7847 10.9329 1.4 34.8 125.8 7.0143 8.2 1.1 GRS 1915+105
299.5882 35.2014 0.4 38.9 169.6 21.4959 28.2 0.1 Cyg X-1
308.0573 40.9460 1.6 40.4 -176.8 4.5064 7.2 2.4 Cyg X-3
326.2253 38.3191 3.6 35.6 -154.9 1.8559 3.2 2.5 Cyg X-2
315.6653 37.8487 2.5 35.6 -169.2 2.2795 4.7 ------ UNKNOWN
310.1979 58.7630 2.0 56.8 -167.2 9.7141 5.6 ------ UNKNOWN
3.4163 11.3530 4.3 41.0 -83.3 6.3184 2.7 ------ UNKNOWN
Plot creation:
Sun May 31 13:04:37 EDT 2015