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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
312.3840 53.0424 0.0129 38.3252 17.3836 1.5005010 14.981 TRIG_00173904
Foreground time interval of the image:
48.528 98.104 (delta_t = 49.576 [sec])
Background time interval of the image:
-299.000 48.528 (delta_t = 347.528 [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 192.000000
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 192.000000
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 192.000000
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 48.528 sec. to 98.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31404 ( -0.186771 0.18388 )
Norm@50keV : 2.00578E-03 ( -0.00021341 0.00021334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.17 using 59 PHA bins.
# Reduced chi-squared = 0.9327 for 57 degrees of freedom
# Null hypothesis probability = 6.196839e-01
Photon flux (15-150 keV) in 49.58 sec: 0.239926 ( -0.0271013 0.0272102 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.79398e-07 ( -1.10999e-07 1.1146e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 48.528 sec. to 98.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.982518 ( -0.853837 0.424687 )
Epeak [keV] : 169.240 ( -169.239 -169.239 )
Norm@50keV : 2.86122E-03 ( -0.00110658 0.00400845 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.58 using 59 PHA bins.
# Reduced chi-squared = 0.9390 for 56 degrees of freedom
# Null hypothesis probability = 6.049967e-01
Photon flux (15-150 keV) in 49.58 sec: 0.236339 ( -0.028361 0.028312 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64207e-07 ( -1.18184e-07 1.17034e-07 ) ergs/cm2
Band function
Time interval is from 48.528 sec. to 98.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.919305 ( 0.921495 1.41244 )
beta : -1.60193 ( 1.61321 0.461671 )
Epeak [keV] : 147.771 ( -148.908 613.52 )
Norm@50keV : 3.07474E-03 ( -0.00120791 0.00645792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.52 using 59 PHA bins.
# Reduced chi-squared = 0.9549 for 55 degrees of freedom
# Null hypothesis probability = 5.699944e-01
Photon flux (15-150 keV) in 49.58 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] : 18.4671 (-2.31486 2.77801)
R^2/D10^2 : 1.39924E-02 (-0.00533838 0.00821388)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.57 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.595691e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.697e-08 9.941e-09
25- 50 2.214e-07 3.850e-08
50-150 5.514e-07 9.936e-08
15-150 8.198e-07 1.197e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.01085 (-0.108554 0.10854)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.85 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.435324e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.248e-07 6.912e-08
25- 50 2.401e-07 9.170e-08
50-150 5.267e-07 2.885e-07
15-150 8.916e-07 4.849e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.94803 (-2.68108 6.00557)
R1^2/D10^2 : 0.334350 (-0.26878 4.14597)
kT2 [keV] : 24.4392 (-5.03045 28.2724)
R2^2/D10^2 : 4.77763E-03 (-0.00443224 0.00630337)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.69 using 59 PHA bins.
# Reduced chi-squared = 0.9762 for 55 degrees of freedom
# Null hypothesis probability = 5.247021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.018e-07 5.280e-08
25- 50 2.148e-07 7.611e-08
50-150 6.261e-07 2.578e-07
15-150 9.427e-07 3.576e-07
Peak spectrum fit
Power-law model
Time interval is from 58.892 sec. to 59.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.856312 ( -0.731692 0.586516 )
Norm@50keV : 4.90138E-03 ( -0.00186363 0.00164763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.16 using 59 PHA bins.
# Reduced chi-squared = 0.9854 for 57 degrees of freedom
# Null hypothesis probability = 5.063922e-01
Photon flux (15-150 keV) in 1 sec: 0.562598 ( -0.19117 0.195474 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59654e-08 ( -1.6993e-08 1.70169e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 58.892 sec. to 59.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.862780 ( -0.751509 0.578106 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 4.95353E-03 ( -0.00100564 0.0276754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.17 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.683143e-01
Photon flux (15-150 keV) in 1 sec: 0.568324 ( -0.197143 0.189808 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59693e-08 ( -1.69516e-08 1.68184e-08 ) ergs/cm2
Band function
Time interval is from 58.892 sec. to 59.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.822498 ( 0.821698 0.821698 )
beta : -0.857227 ( -0.586798 0.73239 )
Epeak [keV] : 13.4004 ( -13.3924 -13.3924 )
Norm@50keV : 7.54901E-03 ( -0.00429586 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.17 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.310069e-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] : 27.5248 (-9.94633 34.3557)
R^2/D10^2 : 1.02153E-02 (-0.0101673 0.0320707)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.78 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.100402e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.275e-09 8.290e-10
25- 50 7.575e-09 4.619e-09
50-150 4.171e-08 2.557e-08
15-150 5.056e-08 2.996e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.45944 (-0.790088 0.789934)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.61 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.468612e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.124e-09 3.813e-09
25- 50 1.178e-08 7.450e-09
50-150 2.584e-08 1.610e-08
15-150 4.374e-08 2.714e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.40031 (-1.76167 2.62622)
R1^2/D10^2 : 1.06067E+04 ( )
kT2 [keV] : 30.1036 (-11.3079 49.6982)
R2^2/D10^2 : 7.67828E-03 (-0.00689192 0.0241359)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.625347e-01
# Null hypothesis probability = 4.661401e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.332e-09 2.014e-09
25- 50 6.704e-09 4.161e-09
50-150 4.282e-08 2.648e-08
15-150 5.385e-08 3.188e-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: 1.31404 ( -0.186771 0.18388 )
Norm@50keV : 2.00578E-03 ( -0.00021341 0.00021334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.17 using 59 PHA bins.
# Reduced chi-squared = 0.9327 for 57 degrees of freedom
# Null hypothesis probability = 6.196839e-01
Photon flux (15-150 keV) in 49.58 sec: 0.239926 ( -0.0271013 0.0272102 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.79398e-07 ( -1.10999e-07 1.1146e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.982518 ( -0.853837 0.424687 )
Epeak [keV] : 169.240 ( -169.239 -169.239 )
Norm@50keV : 2.86122E-03 ( -0.00110658 0.00400845 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.58 using 59 PHA bins.
# Reduced chi-squared = 0.9390 for 56 degrees of freedom
# Null hypothesis probability = 6.049967e-01
Photon flux (15-150 keV) in 49.58 sec: 0.236339 ( -0.028361 0.028312 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64207e-07 ( -1.18184e-07 1.17034e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.919305 ( 0.921495 1.41244 )
beta : -1.60193 ( 1.61321 0.461671 )
Epeak [keV] : 147.771 ( -148.908 613.516 )
Norm@50keV : 3.07474E-03 ( -0.00120791 0.00645792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.52 using 59 PHA bins.
# Reduced chi-squared = 0.9549 for 55 degrees of freedom
# Null hypothesis probability = 5.699944e-01
Photon flux (15-150 keV) in 49.58 sec: ( ) 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) = 2.20e-07
S(50-100 keV) = 3.53e-07
T90 vs. Hardness ratio plot
T90 = 42.5720000267029 sec.
Hardness ratio (energy fluence ratio) = 1.60455
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.60118
Count Ratio (50-100 keV) / (15-25 keV) = 1.40843
Mask shadow pattern
IMX = 7.543637651388493E-01, IMY = -2.361660840860857E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 192.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 192.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 192.000000
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:
-299.000000 48.528000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7781 10.9292 1.5 39.1 -60.2 4.3364 7.8 1.5 GRS 1915+105
299.5853 35.2029 0.2 31.7 -16.0 12.0926 52.9 0.3 Cyg X-1
308.1349 40.9341 1.9 29.8 1.0 1.4375 6.2 1.6 Cyg X-3
326.1258 38.3846 4.3 21.6 27.7 0.5627 2.7 4.3 Cyg X-2
305.4647 58.7415 3.4 45.2 16.4 1.5559 3.4 ------ UNKNOWN
308.0655 37.6562 1.7 27.6 -3.9 1.6338 6.9 ------ UNKNOWN
343.1975 -25.4403 2.7 44.6 -165.6 1.5582 4.3 ------ UNKNOWN
350.0530 -38.5854 3.5 59.0 -166.2 5.6272 3.3 ------ UNKNOWN
275.0447 20.0557 2.6 50.8 -44.4 4.8002 4.5 ------ UNKNOWN
292.3019 -2.9067 2.7 41.0 -82.3 4.2985 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
48.528000 98.104000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7192 10.8606 10.5 39.2 -60.3 0.1575 1.1 6.9 GRS 1915+105
299.6897 35.0694 4.3 31.6 -16.1 0.1977 2.7 9.3 Cyg X-1
307.9042 41.0120 5.6 30.0 0.8 0.1578 2.1 10.0 Cyg X-3
325.9293 38.3751 6.7 21.6 27.3 -0.1147 -1.7 11.8 Cyg X-2
312.3840 53.0424 0.8 38.3 17.4 1.5006 15.0 ------ UNKNOWN
294.9230 47.6007 1.8 41.3 -1.4 0.5788 6.4 ------ UNKNOWN
338.3740 -29.4951 2.4 47.3 -158.3 0.6179 4.8 ------ UNKNOWN
335.2208 -31.4162 2.0 48.7 -154.2 0.7987 5.7 ------ UNKNOWN
269.8112 27.5848 1.8 55.0 -34.6 2.3306 6.3 ------ UNKNOWN
276.7105 18.0097 2.5 49.4 -47.3 1.4238 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
259.700600 303.058700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3876 35.4736 8.3 43.7 -38.0 -0.1573 -1.4 8.6 Her X-1
299.5944 35.2007 0.5 20.0 -96.4 1.6065 25.1 0.2 Cyg X-1
308.0301 40.8958 4.1 12.5 -112.9 0.1697 2.8 5.0 Cyg X-3
326.2622 38.4568 4.3 17.5 -167.0 0.1513 2.7 9.2 Cyg X-2
346.3521 5.3702 2.6 55.2 -170.9 0.8012 4.4 ------ UNKNOWN
Plot creation:
Sun May 31 14:52:21 EDT 2015