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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.1061 36.0962 0.0132 38.6239 92.3736 1.8201596 14.598 TRIG_00614415
Foreground time interval of the image:
0.192 4.368 (delta_t = 4.176 [sec])
Background time interval of the image:
-239.168 0.192 (delta_t = 239.360 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 1.408000
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 1.408000
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 1.408000
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) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.192 sec. to 4.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23893 ( -0.177904 0.175443 )
Norm@50keV : 2.59911E-02 ( -0.00287396 0.00287372 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.85 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.074400e-01
Photon flux (15-150 keV) in 4.176 sec: 3.06860 ( -0.351104 0.351564 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08945e-06 ( -1.29709e-07 1.30125e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.192 sec. to 4.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.869892 ( -0.731312 0.459668 )
Epeak [keV] : 166.702 ( -166.702 -166.702 )
Norm@50keV : 3.91481E-02 ( -0.0153469 0.0462656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.049723e-01
Photon flux (15-150 keV) in 4.176 sec: 3.04996 ( -0.3526 0.35304 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07796e-06 ( -1.34075e-07 1.33123e-07 ) ergs/cm2
Band function
Time interval is from 0.192 sec. to 4.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90652 ( -14.4129 -4.90652 )
beta : -1.37597 ( -0.27628 0.211779 )
Epeak [keV] : 29.0334 ( -7.00322 18.0239 )
Norm@50keV : 806.991 ( -88.5649 8706.27 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.61 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.514612e-01
Photon flux (15-150 keV) in 4.176 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] : 18.4293 (-2.68409 3.22883)
R^2/D10^2 : 0.188446 (-0.0790213 0.13197)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.04 using 59 PHA bins.
# Reduced chi-squared = 1.352 for 57 degrees of freedom
# Null hypothesis probability = 3.971874e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.310e-08 1.115e-08
25- 50 2.499e-07 4.487e-08
50-150 6.196e-07 1.180e-07
15-150 9.226e-07 1.420e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.8092 (-1.44232 1.44224)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.75 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.769293e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.332e-07 5.178e-08
25- 50 2.562e-07 1.403e-07
50-150 5.618e-07 3.088e-07
15-150 9.512e-07 4.877e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.13428 (-2.32652 2.85141)
R1^2/D10^2 : 1.27165 (-0.705829 1.1265)
kT2 [keV] : 37.3913 (-11.1338 42.4523)
R2^2/D10^2 : 1.42033E-02 (-0.0123653 0.0330973)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.80 using 59 PHA bins.
# Reduced chi-squared = 0.9963 for 55 degrees of freedom
# Null hypothesis probability = 4.822654e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.814e-08 5.306e-08
25- 50 2.640e-07 1.252e-07
50-150 7.332e-07 3.745e-07
15-150 1.095e-06 5.081e-07
Peak spectrum fit
Power-law model
Time interval is from 0.676 sec. to 1.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.969808 ( -0.29695 0.281877 )
Norm@50keV : 3.62694E-02 ( -0.00655282 0.0064994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.53 using 59 PHA bins.
# Reduced chi-squared = 0.8690 for 57 degrees of freedom
# Null hypothesis probability = 7.482849e-01
Photon flux (15-150 keV) in 1 sec: 4.16970 ( -0.759385 0.762533 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.9649e-07 ( -7.37272e-08 7.40907e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.676 sec. to 1.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.249342 ( -1.43938 0.855521 )
Epeak [keV] : 141.097 ( -59.9854 -141.096 )
Norm@50keV : 7.60280E-02 ( -0.0443527 0.224226 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.36 using 59 PHA bins.
# Reduced chi-squared = 0.8635 for 56 degrees of freedom
# Null hypothesis probability = 7.562000e-01
Photon flux (15-150 keV) in 1 sec: 4.10386 ( -0.76315 0.76786 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88925e-07 ( -7.7243e-08 7.6433e-08 ) ergs/cm2
Band function
Time interval is from 0.676 sec. to 1.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.17396 ( -0.429967 0.359077 )
Epeak [keV] : 34.5581 ( -15.748 10.9984 )
Norm@50keV : 404.151 ( -72.3024 11708.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.73 using 59 PHA bins.
# Reduced chi-squared = 0.8497 for 55 degrees of freedom
# Null hypothesis probability = 7.784435e-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] : 22.5112 (-4.42216 6.05869)
R^2/D10^2 : 0.145685 (-0.0772107 0.146172)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.76 using 59 PHA bins.
# Reduced chi-squared = 0.9081 for 57 degrees of freedom
# Null hypothesis probability = 6.713770e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.352e-08 4.718e-09
25- 50 7.245e-08 2.196e-08
50-150 2.744e-07 8.835e-08
15-150 3.603e-07 9.720e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 16.9018 (-3.15734 3.15716)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.01 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.670352e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.208e-08 2.453e-08
25- 50 8.095e-08 4.633e-08
50-150 1.775e-07 1.033e-07
15-150 3.006e-07 1.713e-07
Double BB
R1^2/D10^2 : 1.10069 ( )
kT2 [keV] : 33.7571 (-12.0457 -33.9348)
R2^2/D10^2 : 3.34762E-02 (-0.0299317 0.116478)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.64 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.62 using 59 PHA bins.
# Reduced chi-squared = 0.9411 for 55 degrees of freedom
# Reduced chi-squared = 0.8661 for 55 degrees of freedom
# Reduced chi-squared = 0.8658 for 55 degrees of freedom
# Null hypothesis probability = 5.992083e-01
# Null hypothesis probability = 7.490944e-01
# Null hypothesis probability = 7.497862e-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: 1.23893 ( -0.177904 0.175443 )
Norm@50keV : 2.59911E-02 ( -0.00287396 0.00287372 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.85 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.074400e-01
Photon flux (15-150 keV) in 4.176 sec: 3.06860 ( -0.351104 0.351564 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08945e-06 ( -1.29709e-07 1.30125e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.869892 ( -0.731312 0.459668 )
Epeak [keV] : 166.702 ( -166.702 -166.702 )
Norm@50keV : 3.91481E-02 ( -0.0153469 0.0462656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.049723e-01
Photon flux (15-150 keV) in 4.176 sec: 3.04996 ( -0.3526 0.35304 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07796e-06 ( -1.34075e-07 1.33123e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90652 ( -13.6097 -4.90652 )
beta : -1.37597 ( -0.27628 0.211779 )
Epeak [keV] : 29.0334 ( -7.00322 18.0239 )
Norm@50keV : 806.991 ( -88.5649 8706.27 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.61 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.514612e-01
Photon flux (15-150 keV) in 4.176 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) = 2.34e-07
S(50-100 keV) = 3.97e-07
T90 vs. Hardness ratio plot
T90 = 3.47200006246567 sec.
Hardness ratio (energy fluence ratio) = 1.69658
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.71482
Count Ratio (50-100 keV) / (15-25 keV) = 1.3962
Mask shadow pattern
IMX = -3.309004427122656E-02, IMY = -7.982866190425308E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.408000
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:
-239.168000 0.192000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9892 -15.6381 0.4 49.9 -162.8 16.6248 31.0 0.6 Sco X-1
254.3189 35.1642 0.0 9.0 100.4 0.0828 0.4 12.7 Her X-1
268.4777 -1.3879 6.4 42.7 160.6 0.8857 1.8 7.6 SW J1753.5-0127
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.192000 4.368000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1482 -15.7529 687.9 50.1 -163.0 -0.0009 -0.0 11.9 Sco X-1
254.6015 35.5042 8.4 9.3 98.4 -0.0319 -1.4 12.0 Her X-1
268.2409 -1.3377 0.0 42.6 160.8 -0.1327 -2.3 10.3 SW J1753.5-0127
291.1060 36.0961 0.8 38.6 92.4 1.8193 14.1 ------ UNKNOWN
222.8521 -11.8585 2.0 50.1 -134.2 0.5777 5.7 ------ UNKNOWN
215.2227 -1.3371 2.1 44.4 -118.3 0.4908 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
77.332600 899.616800
900.832000 962.892000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5052 35.3740 40.6 29.5 -82.4 0.2429 0.3 3.0 Her X-1
268.3660 -1.4407 5.3 43.1 -147.6 2.2682 2.2 0.7 SW J1753.5-0127
274.0664 -14.1017 6.2 52.7 -161.1 3.0350 1.8 5.3 GX 17+2
288.8039 10.9472 0.4 25.2 -176.7 17.4188 30.1 0.3 GRS 1915+105
299.5860 35.2325 1.0 7.0 92.5 5.6829 11.5 1.9 Cyg X-1
308.1221 40.9791 0.7 14.2 62.7 8.5847 15.8 1.7 Cyg X-3
326.1970 38.3356 5.2 27.9 72.7 1.7996 2.2 1.5 Cyg X-2
14.0206 72.4284 2.7 53.7 19.8 14.4514 4.2 ------ UNKNOWN
294.7598 -20.6231 2.1 56.8 173.9 16.7763 5.4 ------ UNKNOWN
300.5993 57.8555 2.9 22.7 11.2 2.0355 3.9 ------ UNKNOWN
188.5777 85.3869 3.0 55.0 -7.5 7.4476 3.8 ------ UNKNOWN
256.3401 27.5684 4.0 30.5 -98.2 2.3387 2.9 ------ UNKNOWN
192.0219 71.9408 2.9 58.6 -23.0 15.4285 3.9 ------ UNKNOWN
229.7887 48.0324 3.7 45.8 -56.9 9.7405 3.2 ------ UNKNOWN
Plot creation:
Sun May 10 14:19:50 EDT 2015