Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minutes to calcaulte
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.0814 +24.1580 0.0107 10.7 137.9 1.6726 18.1 TRIG_01413695
------------------------------------------
Foreground time interval of the image:
-28.296 29.757 (delta_t = 58.053 [sec])
Background time interval of the image:
-239.544 -28.296 (delta_t = 211.248 [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 2.048000
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 2.048000
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 2.048000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
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 -28.296 sec. to 32.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85501 ( -0.148752 0.154076 )
Norm@50keV : 1.51289E-03 ( -0.000152942 0.000150781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.39 using 59 PHA bins.
# Reduced chi-squared = 1.656 for 57 degrees of freedom
# Null hypothesis probability = 1.353253e-03
Photon flux (15-150 keV) in 60.68 sec: 0.213086 ( -0.0181666 0.0181717 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44059e-07 ( -8.47469e-08 8.60904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.296 sec. to 32.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.774113 ( -0.814441 0.68114 )
Epeak [keV] : 48.3759 ( -7.8834 15.8708 )
Norm@50keV : 6.20501E-03 ( -0.00361586 0.0118547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.37 using 59 PHA bins.
# Reduced chi-squared = 1.542 for 56 degrees of freedom
# Null hypothesis probability = 5.678527e-03
Photon flux (15-150 keV) in 60.68 sec: 0.204798 ( -0.018756 0.01879 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.63688e-07 ( -9.0753e-08 9.61232e-08 ) ergs/cm2
Band function
Time interval is from -28.296 sec. to 32.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.774010 ( -0.578986 0.897104 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 48.3657 ( -7.88008 15.8682 )
Norm@50keV : 6.20582E-03 ( -0.00361659 0.0118599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.37 using 59 PHA bins.
# Reduced chi-squared = 1.570 for 55 degrees of freedom
# Null hypothesis probability = 4.398041e-03
Photon flux (15-150 keV) in 60.68 sec: 0.205774 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6455e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.9279 (-1.02434 1.14165)
R^2/D10^2 : 7.34803E-02 (-0.0229721 0.0330098)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.54 using 59 PHA bins.
# Reduced chi-squared = 1.7990 for 57 degrees of freedom
# Null hypothesis probability = 2.052127e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.111e-07 1.839e-08
25- 50 3.115e-07 3.213e-08
50-150 2.091e-07 4.308e-08
15-150 6.317e-07 7.021e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.6352 (-20.1346 32.1319)
Norm : 0.998652 (-0.118779 0.139999)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.575e-07 1.948e-08
25- 50 2.614e-07 2.360e-08
50-150 3.770e-07 1.445e-07
15-150 7.959e-07 1.511e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17501 (-2.02918 2.25191)
R1^2/D10^2 : 0.357788 (-0.21427 1.05114)
kT2 [keV] : 17.3761 (-4.0839 9.76713)
R2^2/D10^2 : 9.02638E-03 (-0.00771124 0.0206568)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.480e-07 7.360e-08
25- 50 2.722e-07 1.284e-07
50-150 3.395e-07 1.817e-07
15-150 7.597e-07 3.001e-07
Peak spectrum fit
Power-law model
Time interval is from 1.052 sec. to 2.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62532 ( -0.344706 0.359539 )
Norm@50keV : 5.17065E-03 ( -0.00120624 0.00117674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.65 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 57 degrees of freedom
# Null hypothesis probability = 9.157085e-02
Photon flux (15-150 keV) in 1 sec: 0.669771 ( -0.141206 0.141251 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8214e-08 ( -1.17482e-08 1.20758e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.052 sec. to 2.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04720 ( -1.90355 0.890837 )
Epeak [keV] : 72.4730 ( )
Norm@50keV : 1.10055E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.05 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 56 degrees of freedom
# Null hypothesis probability = 8.478190e-02
Photon flux (15-150 keV) in 1 sec: 0.661237 ( -0.071643 0.142454 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56243e-08 ( -1.33106e-08 1.33299e-08 ) ergs/cm2
Band function
Time interval is from 1.052 sec. to 2.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94928 ( -6.38647 -4.94928 )
beta : -1.97051 ( -0.823926 0.479113 )
Epeak [keV] : 27.6644 ( -10.1621 15.6201 )
Norm@50keV : 337.658 ( -69.348 5547.21 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.77 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 55 degrees of freedom
# Null hypothesis probability = 1.004397e-01
Photon flux (15-150 keV) in 1 sec: 0.661235 ( 6.33877 -0.14222 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.0568 (-2.56761 3.78098)
R^2/D10^2 : 0.227327 (-0.149675 0.370724)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.813e-09 2.572e-09
25- 50 1.655e-08 5.928e-09
50-150 1.147e-08 6.249e-09
15-150 3.383e-08 1.211e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 151.833 (-86.8845 -149.271)
Norm : 2.78561 (-0.618562 0.885328)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.147e-09 4.110e-09
25- 50 1.327e-08 7.445e-09
50-150 2.633e-08 1.669e-08
15-150 4.674e-08 2.765e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.76112 (-2.56684 3.17321)
R1^2/D10^2 : 0.647198 (-0.44803 1.82315)
kT2 [keV] : 33.6098 (-26.8161 -33.1415)
R2^2/D10^2 : 2.94035E-03 (-0.00302421 0.0394134)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.369e-09 4.471e-09
25- 50 1.454e-08 8.650e-09
50-150 2.628e-08 1.552e-08
15-150 4.819e-08 2.473e-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: 1.81452 ( -0.156174 0.161682 )
Norm@50keV : 1.46907E-03 ( -0.000155022 0.000152786 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.89 using 59 PHA bins.
# Reduced chi-squared = 1.665 for 57 degrees of freedom
# Null hypothesis probability = 1.212770e-03
Photon flux (15-150 keV) in 58.05 sec: 0.203586 ( -0.0183874 0.018392 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84726e-07 ( -8.33505e-08 8.46973e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.790899 ( -0.833093 0.694079 )
Epeak [keV] : 51.0839 ( -9.00904 22.1094 )
Norm@50keV : 5.53170E-03 ( -0.00324114 0.0107831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.06 using 59 PHA bins.
# Reduced chi-squared = 1.573 for 56 degrees of freedom
# Null hypothesis probability = 4.009520e-03
Photon flux (15-150 keV) in 58.05 sec: 0.196161 ( -0.018948 0.018977 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.14543e-07 ( -8.9368e-08 9.42732e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.790826 ( -0.539455 1.01978 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 51.0734 ( -9.01368 22.1076 )
Norm@50keV : 5.53214E-03 ( -0.00324178 0.0107861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.06 using 59 PHA bins.
# Reduced chi-squared = 1.601 for 55 degrees of freedom
# Null hypothesis probability = 3.078285e-03
Photon flux (15-150 keV) in 58.05 sec: 0.197571 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1636e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.42e-07
S(50-100 keV) = 2.68e-07
T90 vs. Hardness ratio plot
T90 = 55.4199999570847 sec.
Hardness ratio (energy fluence ratio) = 1.10744
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.11553
Count Ratio (50-100 keV) / (15-25 keV) = 0.583594
Mask shadow pattern
IMX = -1.401573809634390E-01, IMY = -1.265262689227134E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.544000 -28.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.7157 35.3414 56.4 11.6 8.2 0.0603 0.2 12.6 Her X-1
262.7673 -24.7336 10.5 50.6 -139.1 1.5723 1.1 13.2 GX 1+4
268.5113 -1.5277 15.6 28.0 -151.8 -0.2553 -0.7 9.7 SW J1753.5-0127
270.3769 -25.1880 7.9 51.6 -147.9 -1.4223 -1.5 8.2 GX 5-1
270.2990 -25.7400 4.0 52.2 -147.7 -3.0226 -2.9 0.3 GRS 1758-258
273.9910 -14.0469 3.1 41.5 -155.8 1.8685 3.8 1.1 GX 17+2
275.9390 -30.4841 58.9 57.8 -152.5 -0.3693 -0.2 7.1 H1820-303
285.1218 -24.9501 5.5 55.3 -163.9 2.1886 2.1 5.0 HT1900.1-2455
288.8729 10.8783 5.2 29.1 157.3 0.9633 2.2 6.0 GRS 1915+105
299.6025 35.2136 0.8 33.1 105.8 7.5480 14.4 0.9 Cyg X-1
308.3213 40.9265 8.9 40.6 97.7 1.2331 1.3 9.7 Cyg X-3
240.6966 69.7650 2.6 45.7 31.0 2.4418 4.4 ------ UNKNOWN
251.7594 31.2697 3.2 10.8 -16.2 1.0224 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-28.296000 29.756600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5115 35.3536 15.1 11.7 7.6 0.0676 0.8 2.7 Her X-1
262.9738 -24.7434 2700.0 50.6 -139.4 -0.0010 -0.0 1.9 GX 1+4
268.4701 -1.5589 7.4 28.0 -151.7 0.1571 1.6 8.8 SW J1753.5-0127
270.2237 -25.0296 7.9 51.4 -147.8 -0.4601 -1.5 4.4 GX 5-1
270.2849 -25.7798 6.9 52.2 -147.7 0.5524 1.7 2.4 GRS 1758-258
274.0264 -14.1978 7.1 41.6 -155.8 0.2437 1.6 9.8 GX 17+2
275.9878 -30.3670 15.8 57.7 -152.6 -0.4007 -0.7 3.3 H1820-303
284.9904 -24.7719 4.4 55.1 -163.8 0.9530 2.7 9.3 HT1900.1-2455
288.7347 11.0800 5.7 28.9 157.1 0.2370 2.0 8.9 GRS 1915+105
299.8076 35.1430 0.0 33.3 106.0 0.2862 1.7 11.2 Cyg X-1
307.9654 40.8031 402.2 40.3 97.8 -0.0115 -0.0 11.1 Cyg X-3
279.2538 25.5617 2.4 15.2 128.7 0.4610 4.7 ------ UNKNOWN
274.0814 24.1580 0.6 10.7 137.9 1.6724 18.1 ------ UNKNOWN
201.1716 40.1219 2.3 52.3 -16.7 1.2800 5.1 ------ UNKNOWN
267.4158 -28.1810 2.2 54.3 -144.1 2.6085 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
69.556600 95.934500
97.456000 962.507300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2377 35.3131 12.6 20.4 -13.2 -1.1295 -0.9 10.9 Her X-1
268.3310 -1.3471 13.6 26.2 -127.7 1.1601 0.9 6.7 SW J1753.5-0127
270.4737 -25.0967 254.8 49.4 -136.5 0.2463 0.0 10.4 GX 5-1
270.2960 -25.7437 15.1 50.1 -136.3 4.5780 0.8 0.4 GRS 1758-258
274.0746 -14.0370 6.1 38.3 -140.8 3.8782 1.9 4.0 GX 17+2
284.9093 -24.9671 7.8 50.3 -153.6 -4.7165 -1.5 7.4 HT1900.1-2455
289.0018 10.9035 0.0 19.5 169.8 -1.5036 -1.3 12.2 GRS 1915+105
299.6159 35.2173 0.7 24.7 97.0 28.6303 16.6 1.6 Cyg X-1
308.1447 40.9586 48.1 33.0 90.5 0.5273 0.2 1.6 Cyg X-3
Plot creation:
Fri Nov 14 13:14:51 EST 2025