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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
249.3898 29.7973 0.0171 22.7361 -158.7690 0.5935933 11.257 TRIG_00557589
Foreground time interval of the image:
-1.344 16.837 (delta_t = 18.181 [sec])
Background time interval of the image:
-190.763 -1.344 (delta_t = 189.419 [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 1.024000
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 1.024000
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 1.024000
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 -1.344 sec. to 296.912 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51869 ( -0.120014 0.120788 )
Norm@50keV : 9.77123E-04 ( -6.81123e-05 6.77404e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.24 using 59 PHA bins.
# Reduced chi-squared = 0.9165 for 57 degrees of freedom
# Null hypothesis probability = 6.538391e-01
Photon flux (15-150 keV) in 298.3 sec: 0.122606 ( -0.00827506 0.0082825 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75683e-06 ( -2.1168e-07 2.13664e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.344 sec. to 296.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29075 ( -0.488257 0.291279 )
Epeak [keV] : 150.292 ( -72.4793 -150.3 )
Norm@50keV : 1.28335E-03 ( -0.000361368 0.000981835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.48 using 59 PHA bins.
# Reduced chi-squared = 0.9193 for 56 degrees of freedom
# Null hypothesis probability = 6.463191e-01
Photon flux (15-150 keV) in 298.3 sec: 0.121189 ( -0.008719 0.008702 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6976e-06 ( -2.42494e-07 2.37104e-07 ) ergs/cm2
Band function
Time interval is from -1.344 sec. to 296.912 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.45261 ( -3.9959 -3.9959 )
beta : -1.57652 ( -0.151858 0.14271 )
Epeak [keV] : 24.3197 ( -23.9374 105.438 )
Norm@50keV : 8.49016 ( -8.46493 49.4338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.73 using 59 PHA bins.
# Reduced chi-squared = 0.9224 for 55 degrees of freedom
# Null hypothesis probability = 6.382957e-01
Photon flux (15-150 keV) in 298.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72532e-06 ( -2.72323e-06 -2.20465e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4294 (-1.25623 1.39613)
R^2/D10^2 : 1.55089E-02 (-0.00430367 0.00589164)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.96 using 59 PHA bins.
# Reduced chi-squared = 1.8064 for 57 degrees of freedom
# Null hypothesis probability = 1.852875e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.028e-07 2.653e-08
25- 50 7.769e-07 6.309e-08
50-150 1.081e-06 1.535e-07
15-150 2.061e-06 1.793e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.499536 (-0.0331303 0.0331296)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.69 using 59 PHA bins.
# Reduced chi-squared = 0.9068 for 57 degrees of freedom
# Null hypothesis probability = 6.740102e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.711e-07 3.117e-08
25- 50 7.139e-07 9.277e-08
50-150 1.566e-06 4.642e-07
15-150 2.651e-06 5.881e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17849 (-1.28828 1.63312)
R1^2/D10^2 : 0.192464 (-0.104311 0.263942)
kT2 [keV] : 23.7075 (-4.10843 7.38048)
R2^2/D10^2 : 2.24050E-03 (-0.00138252 0.00228535)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.66 using 59 PHA bins.
# Reduced chi-squared = 0.9392 for 55 degrees of freedom
# Null hypothesis probability = 6.031809e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.704e-07 1.173e-07
25- 50 6.923e-07 1.577e-07
50-150 1.584e-06 5.046e-07
15-150 2.647e-06 6.837e-07
Peak spectrum fit
Power-law model
Time interval is from 160.356 sec. to 161.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01167 ( -0.125553 0.124083 )
Norm@50keV : 2.17567E-02 ( -0.00153797 0.0015366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.13 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.686305e-01
Photon flux (15-150 keV) in 1 sec: 2.50683 ( -0.17944 0.179015 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34303e-07 ( -1.87006e-08 1.8792e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 160.356 sec. to 161.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.913282 ( -0.482285 0.1582 )
Epeak [keV] : 625.590 ( -625.59 -625.59 )
Norm@50keV : 2.41234E-02 ( -0.00360537 0.0151456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.99 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 56 degrees of freedom
# Null hypothesis probability = 2.427356e-01
Photon flux (15-150 keV) in 1 sec: 2.50769 ( -0.19786 0.17676 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3327e-07 ( -1.962e-08 1.9455e-08 ) ergs/cm2
Band function
Time interval is from 160.356 sec. to 161.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.836154 ( 0.836154 0.836154 )
beta : -1.01170 ( -0.124029 0.125601 )
Epeak [keV] : 60.0661 ( )
Norm@50keV : 3.49990E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.13 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Null hypothesis probability = 2.109608e-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] : 21.8102 (-2.20505 2.53204)
R^2/D10^2 : 9.13812E-02 (-0.0262621 0.0359681)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.02 using 59 PHA bins.
# Reduced chi-squared = 1.8074 for 57 degrees of freedom
# Null hypothesis probability = 1.825475e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.076e-09 1.088e-09
25- 50 4.249e-08 4.350e-09
50-150 1.510e-07 1.920e-08
15-150 2.015e-07 1.720e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.95064 (-0.734448 0.734447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.05 using 59 PHA bins.
# Reduced chi-squared = 1.9659 for 57 degrees of freedom
# Null hypothesis probability = 1.863768e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.478e-08 2.645e-09
25- 50 4.766e-08 1.036e-08
50-150 1.045e-07 4.515e-08
15-150 1.770e-07 4.260e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.66222 (-2.25581 2.55859)
R1^2/D10^2 : 0.936446 (-0.487403 1.45209)
kT2 [keV] : 37.6164 (-8.3797 18.9199)
R2^2/D10^2 : 1.46694E-02 (-0.00996073 0.0178131)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.99 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 55 degrees of freedom
# Null hypothesis probability = 2.145418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.619e-08 5.824e-09
25- 50 4.552e-08 1.375e-08
50-150 1.746e-07 8.106e-08
15-150 2.364e-07 8.135e-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: 1.66597 ( -0.230388 0.237668 )
Norm@50keV : 2.02838E-03 ( -0.000302016 0.000296134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.05 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 57 degrees of freedom
# Null hypothesis probability = 2.824939e-02
Photon flux (15-150 keV) in 18.18 sec: 0.266268 ( -0.0351031 0.0351133 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42429e-07 ( -5.34901e-08 5.47563e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23826 ( -1.03455 0.629485 )
Epeak [keV] : 78.5430 ( -31.1032 -78.543 )
Norm@50keV : 3.52056E-03 ( -0.00112658 0.0097763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.33 using 59 PHA bins.
# Reduced chi-squared = 1.399 for 56 degrees of freedom
# Null hypothesis probability = 2.606693e-02
Photon flux (15-150 keV) in 18.18 sec: 0.261867 ( -0.036154 0.03614 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26633e-07 ( -6.10357e-08 6.27046e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25630 ( -0.507038 0.654304 )
beta : -9.37068 ( 9.37161 19.3716 )
Epeak [keV] : 80.1105 ( -32.4955 -79.747 )
Norm@50keV : 3.43865E-03 ( -0.00168869 0.00102028 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.33 using 59 PHA bins.
# Reduced chi-squared = 1.424 for 55 degrees of freedom
# Null hypothesis probability = 2.107565e-02
Photon flux (15-150 keV) in 18.18 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28909e-07 ( -3.28782e-07 -5.46e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.88e-07
S(50-100 keV) = 9.60e-07
T90 vs. Hardness ratio plot
T90 = 276.65600001812 sec.
Hardness ratio (energy fluence ratio) = 1.39535
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.30783
Count Ratio (50-100 keV) / (15-25 keV) = 0.976729
Mask shadow pattern
IMX = -3.906085022890637E-01, IMY = 1.517500515839977E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-190.763400 -1.344000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6423 35.4200 7.6 21.9 -140.0 -0.2941 -1.5 10.2 Her X-1
268.4821 -1.4196 6.5 21.4 89.9 -0.3981 -1.8 7.1 SW J1753.5-0127
273.9632 -13.9037 12.6 33.7 76.9 0.3789 0.9 8.3 GX 17+2
288.8033 10.9552 0.8 18.5 16.3 2.6162 15.2 0.7 GRS 1915+105
299.5890 35.1256 3.4 28.8 -47.5 0.7408 3.4 4.6 Cyg X-1
308.0704 40.8973 3.7 37.3 -52.1 0.9860 3.2 3.8 Cyg X-3
326.3080 38.2501 30.0 50.3 -43.3 0.4238 0.4 7.7 Cyg X-2
214.8382 16.5822 3.1 54.1 177.1 2.8787 3.7 ------ UNKNOWN
232.9090 31.6368 2.7 36.9 -162.7 0.9717 4.2 ------ UNKNOWN
326.7058 39.1790 4.1 50.7 -44.5 3.0004 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.344000 16.836600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3170 35.4843 4.6 22.1 -140.3 -0.1365 -2.5 10.9 Her X-1
268.2454 -1.3322 5.0 21.4 90.6 0.1555 2.3 10.3 SW J1753.5-0127
273.8571 -14.1087 101.2 33.9 77.1 0.0124 0.1 9.7 GX 17+2
288.9093 10.7735 0.0 18.7 16.7 -0.0589 -1.2 12.2 GRS 1915+105
299.5286 35.0683 26.4 28.8 -47.4 -0.0271 -0.4 8.6 Cyg X-1
308.0057 41.1083 7.6 37.4 -52.4 0.1366 1.5 10.5 Cyg X-3
326.1372 38.3927 3.5 50.1 -43.5 0.7808 3.3 4.6 Cyg X-2
235.5920 -4.3384 2.1 43.0 140.4 0.8476 5.4 ------ UNKNOWN
249.3898 29.7973 1.0 22.7 -158.8 0.5935 11.3 ------ UNKNOWN
265.1741 40.7074 1.9 21.8 -113.3 0.3351 6.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
61.436590 962.386000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4107 35.2935 6.6 6.9 -47.1 0.9617 1.7 3.7 Her X-1
268.3745 -1.4416 16.2 36.1 63.4 0.9418 0.7 0.8 SW J1753.5-0127
288.7875 10.9231 1.0 41.2 25.7 11.1224 11.9 1.5 GRS 1915+105
299.5790 35.0841 2.9 42.2 -13.9 3.0302 4.0 7.1 Cyg X-1
308.0922 40.9609 2.5 48.2 -23.2 5.7029 4.7 1.0 Cyg X-3
220.2207 -7.0118 2.8 46.3 138.9 10.2571 4.2 ------ UNKNOWN
195.3402 9.8236 4.6 54.1 177.0 5.7673 2.5 ------ UNKNOWN
249.3903 29.8293 1.2 0.1 -115.5 4.9402 9.4 ------ UNKNOWN
190.8572 11.3177 3.7 57.2 -178.9 11.4269 3.2 ------ UNKNOWN
212.8719 33.7836 3.5 31.2 -156.2 2.3693 3.3 ------ UNKNOWN
220.6487 37.2982 3.1 25.0 -148.0 2.0125 3.8 ------ UNKNOWN
225.9346 43.1627 3.1 23.0 -131.2 2.1397 3.7 ------ UNKNOWN
185.3452 21.3341 4.1 57.7 -165.4 9.4656 2.8 ------ UNKNOWN
184.2286 20.2947 3.7 59.1 -166.1 14.5760 3.1 ------ UNKNOWN
182.1903 25.8401 3.7 58.7 -159.3 16.6563 3.1 ------ UNKNOWN
223.2586 67.8604 6.1 41.1 -97.8 7.2354 1.9 ------ UNKNOWN
186.1790 46.3146 4.0 51.0 -135.7 10.4110 2.9 ------ UNKNOWN
Plot creation:
Sat May 30 16:37:12 EDT 2015