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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.4816 -3.8802 0.0176 16.9258 -88.7082 0.8462499 10.912 TRIG_00505801
Foreground time interval of the image:
-4.080 37.296 (delta_t = 41.376 [sec])
Background time interval of the image:
-239.000 -4.080 (delta_t = 234.920 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -4.080 sec. to 37.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17522 ( -0.259311 0.282535 )
Norm@50keV : 1.03425E-03 ( -0.000203817 0.000199043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.39 using 59 PHA bins.
# Reduced chi-squared = 0.9192 for 57 degrees of freedom
# Null hypothesis probability = 6.482985e-01
Photon flux (15-150 keV) in 41.38 sec: 0.169024 ( -0.0229435 0.0229435 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01034e-07 ( -6.74171e-08 7.00315e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.080 sec. to 37.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31602 ( -1.72478 0.746759 )
Epeak [keV] : 29.4747 ( )
Norm@50keV : 3.54144E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.01 using 59 PHA bins.
# Reduced chi-squared = 0.9108 for 56 degrees of freedom
# Null hypothesis probability = 6.639140e-01
Photon flux (15-150 keV) in 41.38 sec: 0.164358 ( -0.023638 0.023792 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.63095e-07 ( -7.3286e-08 8.73846e-08 ) ergs/cm2
Band function
Time interval is from -4.080 sec. to 37.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.619692 ( 0.600082 0.600082 )
beta : -2.58217 ( 2.57683 0.536882 )
Epeak [keV] : 28.2301 ( -28.1111 13.7864 )
Norm@50keV : 1.13299E-02 ( -0.0128028 244.458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.9159 for 55 degrees of freedom
# Null hypothesis probability = 6.516527e-01
Photon flux (15-150 keV) in 41.38 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75355e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.26549 (-1.17679 1.39072)
R^2/D10^2 : 0.164295 (-0.0759844 0.139131)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.669934e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.596e-08 2.050e-08
25- 50 1.591e-07 3.391e-08
50-150 4.646e-08 1.973e-08
15-150 2.915e-07 5.830e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.2353 (-14.2258 25.2388)
Norm : 1.00377 (-0.222723 0.310464)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.99 using 59 PHA bins.
# Reduced chi-squared = 0.8945 for 57 degrees of freedom
# Null hypothesis probability = 6.988591e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.962e-08 1.769e-08
25- 50 1.390e-07 2.621e-08
50-150 1.251e-07 5.390e-08
15-150 3.637e-07 7.552e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.18430 (-3.24923 2.13256)
R1^2/D10^2 : 0.406133 (-0.253374 5.2609)
kT2 [keV] : 19.3028 (-13.6206 -19.4692)
R2^2/D10^2 : 3.07295E-03 (-0.00293354 0.0561782)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.9231 for 55 degrees of freedom
# Null hypothesis probability = 6.369013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.834e-08 5.406e-08
25- 50 1.398e-07 7.532e-08
50-150 1.335e-07 8.807e-08
15-150 3.717e-07 1.920e-07
Peak spectrum fit
Power-law model
Time interval is from 21.712 sec. to 22.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77599 ( -0.556372 0.595708 )
Norm@50keV : 3.29215E-03 ( -0.00123592 0.00117847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.8952 for 57 degrees of freedom
# Null hypothesis probability = 6.975621e-01
Photon flux (15-150 keV) in 1 sec: 0.449498 ( -0.143346 0.143439 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.03372e-08 ( -1.10921e-08 1.16802e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.712 sec. to 22.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28905E-02 ( 0.0421105 2.14946 )
Epeak [keV] : 41.5682 ( )
Norm@50keV : 4.12784E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.9032 for 56 degrees of freedom
# Null hypothesis probability = 6.794301e-01
Photon flux (15-150 keV) in 1 sec: 0.414769 ( -0.148585 0.224354 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27586e-08 ( -9.0289e-09 1.80151e-08 ) ergs/cm2
Band function
Time interval is from 21.712 sec. to 22.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.77691 ( -1.1113 -1.1113 )
beta : -2.62920 ( 2.53883 1.14959 )
Epeak [keV] : 34.3339 ( -36.3997 69.2301 )
Norm@50keV : 3.05947 ( -3.04882 46.502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.58 using 59 PHA bins.
# Reduced chi-squared = 0.9015 for 55 degrees of freedom
# Null hypothesis probability = 6.810511e-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] : 9.79314 (-2.57549 3.86935)
R^2/D10^2 : 0.242245 (-0.242243 0.531367)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.8877 for 57 degrees of freedom
# Null hypothesis probability = 7.123544e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.696e-09 2.962e-09
25- 50 1.133e-08 6.785e-09
50-150 5.566e-09 4.159e-09
15-150 2.159e-08 1.345e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.3187 (-54.6393 -87.3188)
Norm : 2.07812 (-0.790411 1.40243)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.86 using 59 PHA bins.
# Reduced chi-squared = 0.8923 for 57 degrees of freedom
# Null hypothesis probability = 7.033797e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.417e-09 3.308e-09
25- 50 9.100e-09 5.665e-09
50-150 1.360e-08 1.184e-08
15-150 2.812e-08 1.967e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.132 ( )
R1^2/D10^2 : 5.24657E-05 (-2.62211e-05 0.0103826)
kT2 [keV] : 8.61043 (-2.29508 3.23082)
R2^2/D10^2 : 0.359783 (-0.258636 0.839524)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.56 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.48 using 59 PHA bins.
# Reduced chi-squared = 0.9193 for 55 degrees of freedom
# Reduced chi-squared = 0.8633 for 55 degrees of freedom
# Null hypothesis probability = 6.446433e-01
# Null hypothesis probability = 7.542292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.714e-09 4.253e-06
25- 50 1.092e-08 3.434e-05
50-150 5.987e-09 8.770e-04
15-150 2.162e-08 9.920e-04
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: 2.17522 ( -0.259311 0.282535 )
Norm@50keV : 1.03425E-03 ( -0.000203817 0.000199043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.39 using 59 PHA bins.
# Reduced chi-squared = 0.9192 for 57 degrees of freedom
# Null hypothesis probability = 6.482985e-01
Photon flux (15-150 keV) in 41.38 sec: 0.169024 ( -0.0229435 0.0229435 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01034e-07 ( -6.74171e-08 7.00315e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31602 ( -1.72478 0.746759 )
Epeak [keV] : 29.4747 ( )
Norm@50keV : 3.54144E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.01 using 59 PHA bins.
# Reduced chi-squared = 0.9108 for 56 degrees of freedom
# Null hypothesis probability = 6.639140e-01
Photon flux (15-150 keV) in 41.38 sec: 0.164358 ( -0.023638 0.023792 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.63095e-07 ( -7.3286e-08 8.73846e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.619692 ( 0.600082 0.600082 )
beta : -2.58217 ( 2.57683 0.536882 )
Epeak [keV] : 28.2301 ( -28.1111 13.7864 )
Norm@50keV : 1.13299E-02 ( -0.0128028 244.458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.9159 for 55 degrees of freedom
# Null hypothesis probability = 6.516527e-01
Photon flux (15-150 keV) in 41.38 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75355e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.26e-07
S(50-100 keV) = 1.12e-07
T90 vs. Hardness ratio plot
T90 = 32.7079999446869 sec.
Hardness ratio (energy fluence ratio) = 0.888889
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.1602
Count Ratio (50-100 keV) / (15-25 keV) = 0.401081
Mask shadow pattern
IMX = 6.860509801925356E-03, IMY = 3.042375419936534E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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 -4.080000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3346 35.2951 6.0 46.6 -21.4 -0.6960 -1.9 6.7 Her X-1
263.0093 -24.7464 54.8 34.9 -121.5 0.0645 0.2 0.1 GX 1+4
264.9216 -44.4488 40.4 49.5 -141.7 -0.1769 -0.3 7.7 4U 1735-44
268.3301 -1.4961 2.5 19.6 -79.4 0.8917 4.5 3.5 SW J1753.5-0127
270.3235 -25.0615 2.3 30.8 -131.0 1.3081 5.0 2.4 GX 5-1
270.3759 -25.6679 4.6 31.2 -131.8 0.6725 2.5 6.0 GRS 1758-258
273.9900 -14.0913 2.7 20.1 -120.8 0.8322 4.2 3.4 GX 17+2
276.0343 -30.4108 2.8 33.0 -144.3 0.9201 4.1 6.2 H1820-303
285.1848 -24.8906 19.8 25.6 -157.6 0.1085 0.6 8.3 HT1900.1-2455
288.8099 10.8096 3.0 10.2 22.4 0.6920 3.9 8.2 GRS 1915+105
299.5315 35.2966 8.1 36.4 33.1 0.4650 1.4 6.4 Cyg X-1
308.1632 40.9544 9.1 44.3 38.9 0.9010 1.3 2.4 Cyg X-3
263.0073 -33.9646 4.7 41.7 -131.6 0.9174 2.4 7.8 GX 354-0
312.0793 6.7335 3.7 25.0 92.1 0.8417 3.1 ------ UNKNOWN
278.6157 -12.8763 2.6 16.3 -129.4 0.8092 4.5 ------ UNKNOWN
239.3411 37.3429 3.6 57.7 -27.9 4.0593 3.2 ------ UNKNOWN
241.5540 18.5338 2.6 48.8 -48.8 3.6841 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.080000 37.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2807 35.4184 6.3 46.7 -21.3 0.2479 1.8 9.8 Her X-1
262.9313 -24.8848 5.0 35.1 -121.5 0.2625 2.3 9.4 GX 1+4
264.6704 -44.5337 6.3 49.6 -141.6 0.4277 1.8 5.9 4U 1735-44
268.3011 -1.3251 6.1 19.6 -78.9 0.1491 1.9 8.6 SW J1753.5-0127
270.3244 -25.1695 8.5 30.8 -131.1 -0.1267 -1.4 5.8 GX 5-1
270.4126 -25.5884 0.0 31.1 -131.7 -0.0803 -0.9 11.0 GRS 1758-258
274.1113 -13.8639 0.0 19.8 -120.5 0.2078 2.6 12.0 GX 17+2
276.1135 -30.4285 4.2 33.0 -144.4 -0.2410 -2.7 10.4 H1820-303
285.1836 -24.8872 4.9 25.6 -157.6 0.1678 2.3 8.3 HT1900.1-2455
288.6155 11.0264 6.5 10.4 21.2 0.1213 1.8 11.8 GRS 1915+105
299.5155 35.2688 6.6 36.3 33.1 -0.2248 -1.8 5.4 Cyg X-1
308.1525 41.0875 92.7 44.5 38.8 -0.0296 -0.1 8.3 Cyg X-3
263.0272 -33.8550 11.0 41.6 -131.5 -0.1545 -1.0 2.3 GX 354-0
271.4816 -3.8802 1.1 16.9 -88.7 0.8464 10.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
112.300590 963.111500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9834 -15.6438 0.3 28.6 -107.0 27.6955 36.8 0.3 Sco X-1
254.5859 35.2417 2.9 42.2 -11.6 -3.2659 -4.0 8.7 Her X-1
256.0273 -37.8102 1.5 36.8 -150.3 5.7052 7.7 2.8 4U 1700-377
256.3996 -36.5004 3.9 35.5 -149.7 2.1071 3.0 5.0 GX 349+2
263.0837 -24.8875 5.8 22.5 -150.6 1.1758 2.0 9.4 GX 1+4
264.8341 -44.4513 3.5 41.0 -163.6 2.7162 3.2 3.9 4U 1735-44
268.3822 -1.3993 2.5 4.0 -42.9 2.6938 4.6 3.3 SW J1753.5-0127
270.3019 -25.0988 2.3 21.3 -167.9 2.8954 5.0 1.5 GX 5-1
270.3378 -25.8203 6.0 22.0 -168.0 1.1473 1.9 5.0 GRS 1758-258
274.0207 -13.9792 1.9 10.4 175.6 3.2525 6.1 3.5 GX 17+2
275.9169 -30.3187 5.3 26.8 -179.3 1.3326 2.2 2.9 H1820-303
284.8974 -24.7995 4.7 24.6 158.8 1.5879 2.5 10.5 HT1900.1-2455
288.7582 10.8988 2.7 22.6 58.2 3.0904 4.3 3.7 GRS 1915+105
299.5350 35.1783 10.9 47.1 40.7 2.6092 1.1 3.1 Cyg X-1
263.1461 -33.8139 6.6 31.0 -157.3 1.1531 1.7 7.9 GX 354-0
310.4065 4.9589 3.3 39.8 86.6 9.1981 3.5 ------ UNKNOWN
283.4088 27.1421 2.5 33.1 28.7 3.6550 4.6 ------ UNKNOWN
287.8592 0.5762 2.1 16.9 84.2 3.4904 5.5 ------ UNKNOWN
266.3519 51.2301 3.1 55.3 5.2 11.6060 3.7 ------ UNKNOWN
276.5173 0.5089 2.7 6.6 58.0 2.0978 4.3 ------ UNKNOWN
262.4714 29.9758 3.4 34.9 -4.7 2.3555 3.4 ------ UNKNOWN
Plot creation:
Sat May 30 21:25:00 EDT 2015