Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.8733 -38.9483 0.0513 25.1977 141.5428 1.1548856 3.735 TRIG_01323295
Foreground time interval of the image:
-0.576 260.301 (delta_t = 260.877 [sec])
Background time interval of the image:
-239.600 -0.576 (delta_t = 239.024 [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)
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 -0.576 sec. to 291.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55353 ( -0.393251 0.474421 )
Norm@50keV : 3.36541E-04 ( -0.000106598 0.000102878 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.17 using 59 bins.
Reduced chi-squared = 1.17842
# Null hypothesis probability of 1.68e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 292.1 sec: 6.83526E-02 ( -0.0114096 0.0114077 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.98094e-07 ( -2.11951e-07 2.23682e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.576 sec. to 291.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.03814 ( -0.176368 0.0163784 )
Epeak [keV] : 327.304 ( -0.362703 26.9192 )
Norm@50keV : 1.96250E-04 ( -0.000133677 0.000225966 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.40 using 59 bins.
Reduced chi-squared = 1.18571
# Null hypothesis probability of 1.61e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 292.1 sec: 6.65822E-02 ( -0.0111234 0.0112717 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93198e-07 ( -3.12068e-07 4.09264e-07 ) ergs/cm2
Band function
Time interval is from -0.576 sec. to 291.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 7.15529 (-1.54973 1.81493)
R^2/D10^2 : 0.110524 (-0.0667631 0.20069)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 78.83 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.94e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.715e-07 9.731e-08
25- 50 3.878e-07 1.382e-07
50-150 6.953e-08 3.921e-08
15-150 7.288e-07 2.256e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.7299 (-11.9606 22.1175)
Norm : 0.510967 (-0.171985 0.311306)
------------------------------------------------------------
#Fit statistic : Chi-Squared 70.06 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.15e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.123e-07 7.698e-08
25- 50 3.678e-07 8.966e-08
50-150 2.165e-07 1.197e-07
15-150 8.965e-07 2.404e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.07583 (-1.17334 2.01927)
R1^2/D10^2 : 51.3399 (-53.0141 347990)
kT2 [keV] : 10.1123 (-2.66951 6.21719)
R2^2/D10^2 : 2.25938E-02 (-0.0166942 0.0528351)
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.66 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.35e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.281e-07 1.655e-07
25- 50 3.546e-07 2.037e-07
50-150 1.878e-07 1.307e-07
15-150 8.705e-07 4.504e-07
Peak spectrum fit
Power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09556 ( -0.37794 0.429837 )
Norm@50keV : 5.46319E-03 ( -0.00164226 0.00159547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.64 using 59 bins.
Reduced chi-squared = 0.853333
# Null hypothesis probability of 7.77e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.857706 ( -0.200809 0.200894 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.07388e-08 ( -1.36391e-08 1.41784e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.327913 ( -3.9856 2.1171 )
Epeak [keV] : 38.0122 ( -5.30479 14.6894 )
Norm@50keV : 0.148819 ( -0.165805 48.6149 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.40 using 59 bins.
Reduced chi-squared = 0.792857
# Null hypothesis probability of 8.68e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.821215 ( -0.200636 0.202135 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.42456e-08 ( -1.2049e-08 1.40962e-08 ) ergs/cm2
Band function
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 9.62063 (-1.92346 2.42043)
R^2/D10^2 : 0.502140 (-0.296377 0.689489)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.81 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.79e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.330e-09 4.104e-09
25- 50 2.194e-08 9.783e-09
50-150 1.023e-08 6.124e-09
15-150 4.150e-08 1.546e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.4941 (-21.9957 52.0762)
Norm : 4.84815 (-1.51887 2.23011)
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.96 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.52e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.203e-08 4.057e-09
25- 50 1.768e-08 6.877e-09
50-150 1.827e-08 1.120e-08
15-150 4.798e-08 1.882e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.569122 (-7.14203 -7.14203)
R1^2/D10^2 : 6.68668E+09 (-7.04546e+09 -7.04546e+09)
kT2 [keV] : 9.86918 (-2.00388 2.55069)
R2^2/D10^2 : 0.447391 (-0.269079 0.583582)
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.99 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.56e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.027e-08 1.078e-08
25- 50 2.063e-08 3.663e-08
50-150 1.358e-08 2.393e-08
15-150 4.448e-08 5.820e-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: 2.62285 ( -0.406538 0.4932 )
Norm@50keV : 3.28592E-04 ( -0.000109934 0.000108204 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 70.16 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.13e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 260.9 sec: 6.97314E-02 ( -0.0120163 0.0120169 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.88795e-07 ( -1.94551e-07 2.06721e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97818 ( -1.39758 0.018047 )
Epeak [keV] : 1.27377 ( -0.667643 25.4002 )
Norm@50keV : 8.13283E-04 ( -0.000804806 0.000497063 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 71.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.54e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 260.9 sec: 6.97009E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.83653e-07 ( -2.03888e-07 2.12226e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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) = 3.33e-07
S(50-100 keV) = 2.27e-07
T90 vs. Hardness ratio plot
T90 = 274.171999931335 sec.
Hardness ratio (energy fluence ratio) = 0.681682
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.779932
Count Ratio (50-100 keV) / (15-25 keV) = 0.242516
Mask shadow pattern
IMX = -3.684481368256700E-01, IMY = -2.926280507614518E-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:
-239.600000 -0.576000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2643 -60.5798 6.5 50.3 -134.1 3.4049 1.8 3.0 Cen X-3
186.3694 -62.8371 3.3 44.6 -141.6 -2.5031 -3.5 8.8 GX 301-2
244.9914 -15.6252 0.6 21.4 79.1 8.4795 19.3 1.1 Sco X-1
255.8894 -37.9362 7.2 28.6 136.6 -0.9055 -1.6 7.2 4U 1700-377
256.4004 -36.2713 27.2 28.6 133.0 -0.2571 -0.4 9.3 GX 349+2
263.1687 -24.7053 11.8 34.4 110.7 0.8853 1.0 9.0 GX 1+4
264.6172 -44.3409 8.8 36.7 144.7 -1.0389 -1.3 8.5 4U 1735-44
270.2490 -25.2673 12.1 40.6 113.6 -1.8992 -1.0 11.4 GX 5-1
270.1482 -25.7048 10.0 40.4 114.3 2.3854 1.2 8.7 GRS 1758-258
263.0463 -33.9698 14.8 33.7 127.2 -0.6445 -0.8 8.6 GX 354-0
181.4980 -8.3749 3.0 44.9 -60.2 7.9111 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.576000 260.300590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2820 -60.6658 9.0 50.3 -134.2 1.6192 1.3 2.8 Cen X-3
186.8984 -62.9641 0.0 44.5 -141.9 -0.6965 -1.4 13.4 GX 301-2
245.0015 -15.6421 3.9 21.4 79.2 0.9937 3.0 1.3 Sco X-1
255.8748 -37.8401 11.0 28.5 136.4 0.4044 1.1 5.3 4U 1700-377
256.5070 -36.5544 10.0 28.7 133.6 -0.4536 -1.2 8.6 GX 349+2
263.0265 -24.8186 6.4 34.3 110.9 -0.9542 -1.8 4.5 GX 1+4
264.7304 -44.4348 8.5 36.8 144.8 0.6438 1.4 1.1 4U 1735-44
270.1084 -25.0587 3.5 40.5 113.3 3.6213 3.3 9.6 GX 5-1
270.2519 -25.7607 4.1 40.5 114.4 -3.0291 -2.8 2.9 GRS 1758-258
262.9527 -33.6858 6.8 33.6 126.7 -0.8235 -1.7 9.1 GX 354-0
175.9234 -44.1546 2.1 43.2 -113.2 5.6552 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
424.300600 859.300600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9906 -15.6533 0.5 20.2 134.2 17.5518 23.9 1.0 Sco X-1
254.2971 35.3506 106.5 34.1 -81.0 0.1334 0.1 7.9 Her X-1
256.1292 -37.9768 5.1 39.3 101.7 5.3235 2.3 10.4 4U 1700-377
256.3919 -36.3875 21.4 37.7 101.3 0.9186 0.5 3.0 GX 349+2
263.1890 -24.8608 0.0 27.1 87.5 0.4321 0.4 12.0 GX 1+4
268.3579 -1.4153 1019.4 12.5 24.3 -0.0070 -0.0 2.3 SW J1753.5-0127
270.2047 -24.9454 28.0 29.6 75.2 0.5542 0.4 9.1 GX 5-1
270.2831 -25.6439 8.2 30.2 75.7 -2.0042 -1.4 6.0 GRS 1758-258
274.0763 -13.9295 8.7 23.4 52.9 1.1180 1.3 7.6 GX 17+2
275.7970 -30.4357 3.5 36.9 72.8 7.3103 3.3 7.8 H1820-303
284.9329 -25.1072 59.3 38.4 57.1 -0.3494 -0.2 12.5 HT1900.1-2455
288.8310 10.9131 11.6 33.9 -6.1 0.8394 1.0 2.7 GRS 1915+105
299.5670 35.2161 1.8 52.7 -33.4 15.0598 6.4 1.4 Cyg X-1
262.8450 -33.8108 12.5 35.7 92.1 1.6324 0.9 7.3 GX 354-0
218.6324 1.9069 2.4 37.5 -166.9 4.3060 4.8 ------ UNKNOWN
214.2898 3.8865 2.7 41.9 -164.0 4.5822 4.4 ------ UNKNOWN
205.5601 21.4115 2.5 53.2 -142.3 16.4609 4.6 ------ UNKNOWN
273.6292 43.3824 3.3 44.9 -60.3 13.3797 3.5 ------ UNKNOWN
236.0752 38.5044 2.6 41.5 -102.2 14.1708 4.4 ------ UNKNOWN
Plot creation:
Sun Mar 1 23:40:56 EST 2026