Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
354.7237 -47.9979 0.0068 49.6157 -37.1660 13.1305290 28.076 TRIG_01293340
Foreground time interval of the image:
-1.504 19.040 (delta_t = 20.544 [sec])
Background time interval of the image:
-239.904 -1.504 (delta_t = 238.400 [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)
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 -1.504 sec. to 19.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37096 ( -0.0550559 0.054978 )
Norm@50keV : 4.52742E-02 ( -0.00145307 0.00145263 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 78.10 using 59 bins.
Reduced chi-squared = 1.37018
# Null hypothesis probability of 3.33e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 20.54 sec: 5.47840 ( -0.19299 0.19346 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04171e-06 ( -2.99112e-07 2.99444e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.504 sec. to 19.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.880589 ( -0.250096 0.237276 )
Epeak [keV] : 133.662 ( -26.2399 68.1682 )
Norm@50keV : 7.42107E-02 ( -0.0154282 0.0205461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 65.07 using 59 bins.
Reduced chi-squared = 1.16196
# Null hypothesis probability of 1.90e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 20.54 sec: 5.33324 ( -0.20303 0.2038 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.90575e-06 ( -3.10267e-07 3.09778e-07 ) ergs/cm2
Band function
Time interval is from -1.504 sec. to 19.040 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] : 18.9597 ( )
R^2/D10^2 : 0.291533 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 214.99 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.51e-20 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.234e-07 2.824e-08
25- 50 2.034e-06 8.986e-08
50-150 5.370e-06 2.465e-07
15-150 7.827e-06 2.968e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-5.12916 -200)
Norm : 23.2307 (-0.746549 0.746549)
------------------------------------------------------------
#Fit statistic : Chi-Squared 110.94 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.49e-05 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.189e-06 4.026e-08
25- 50 2.286e-06 8.319e-08
50-150 5.014e-06 1.808e-07
15-150 8.489e-06 2.824e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.76915 (-1.14914 1.49537)
R1^2/D10^2 : 4.88510 (-2.34508 4.88556)
kT2 [keV] : 25.5012 (-2.11316 3.14207)
R2^2/D10^2 : 9.01727E-02 (-0.0325644 0.0352928)
------------------------------------------------------------
#Fit statistic : Chi-Squared 73.52 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.84e-02 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.194e-07 1.547e-07
25- 50 2.100e-06 1.808e-07
50-150 5.837e-06 3.985e-07
15-150 8.856e-06 6.008e-07
Peak spectrum fit
Power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11857 ( -0.0685676 0.0683421 )
Norm@50keV : 0.306865 ( -0.0131936 0.0131869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.53 using 59 bins.
Reduced chi-squared = 1.16719
# Null hypothesis probability of 1.82e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 35.6609 ( -1.5818 1.5831 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18992e-06 ( -1.45882e-07 1.4611e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.411558 ( -0.327103 0.305933 )
Epeak [keV] : 132.236 ( -24.2649 54.9763 )
Norm@50keV : 0.630308 ( -0.164456 0.238011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.78 using 59 bins.
Reduced chi-squared = 0.888929
# Null hypothesis probability of 7.08e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 35.0752 ( -1.5977 1.6001 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15748e-06 ( -1.50504e-07 1.50173e-07 ) ergs/cm2
Band function
Time interval is from 0.140 sec. to 1.140 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] : 20.9503 (-1.03676 1.10228)
R^2/D10^2 : 1.53287 (-0.237369 0.276232)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 110.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.81e-05 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.272e-07 1.040e-08
25- 50 6.531e-07 3.925e-08
50-150 2.136e-06 1.425e-07
15-150 2.916e-06 1.455e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 147.346 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 169.45 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.30e-13 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.669e-07 1.755e-08
25- 50 7.058e-07 3.280e-08
50-150 1.548e-06 7.250e-08
15-150 2.621e-06 1.255e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.31714 (-2.08538 2.81859)
R1^2/D10^2 : 12.6879 (-6.68433 18.6077)
kT2 [keV] : 28.6635 (-3.48027 7.03061)
R2^2/D10^2 : 0.461286 (-0.258526 0.287482)
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.85 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.96e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.241e-07 5.175e-08
25- 50 6.739e-07 1.109e-07
50-150 2.267e-06 2.955e-07
15-150 3.165e-06 4.385e-07
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: 1.37096 ( -0.0550559 0.054978 )
Norm@50keV : 4.52742E-02 ( -0.00145307 0.00145263 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 78.10 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.33e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 20.54 sec: 5.47831 ( -0.192969 0.193449 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04062e-06 ( -2.99114e-07 2.99292e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.880589 ( -0.250096 0.237276 )
Epeak [keV] : 133.662 ( -26.2399 68.1682 )
Norm@50keV : 7.42107E-02 ( -0.0154282 0.0205461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 65.07 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.90e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 20.54 sec: 5.33280 ( -0.20296 0.20373 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.90953e-06 ( -3.11058e-07 3.09764e-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) = 2.10e-06
S(50-100 keV) = 3.25e-06
T90 vs. Hardness ratio plot
T90 = 11.3919998407364 sec.
Hardness ratio (energy fluence ratio) = 1.54762
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.60651
Count Ratio (50-100 keV) / (15-25 keV) = 1.67806
Mask shadow pattern
IMX = 9.368618633999752E-01, IMY = 7.102416133076762E-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:
-239.904000 -1.504000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.1333 -37.7795 3.7 41.1 65.7 5.8389 3.1 8.0 4U 1700-377
256.2787 -36.2994 14.2 40.8 67.9 -1.4091 -0.8 10.6 GX 349+2
262.8376 -24.7835 10.7 34.8 86.5 0.9849 1.1 9.6 GX 1+4
264.6120 -44.5573 3.6 37.0 52.5 2.4618 3.2 8.5 4U 1735-44
268.5005 -1.5354 12.9 37.7 127.1 -0.9757 -0.9 9.4 SW J1753.5-0127
270.2279 -25.1728 11.0 28.1 86.3 0.6899 1.1 6.4 GX 5-1
270.3577 -25.6859 11.6 28.0 85.2 0.6948 1.1 4.5 GRS 1758-258
273.9463 -13.9277 5.1 26.9 111.8 1.3034 2.2 7.4 GX 17+2
275.8887 -30.3636 4.0 23.6 73.1 1.4192 2.9 1.9 H1820-303
284.8658 -24.7794 0.0 14.8 85.7 -0.0400 -0.1 12.6 HT1900.1-2455
288.7885 11.0166 6.0 35.5 167.4 0.9705 1.9 4.3 GRS 1915+105
299.6223 35.2151 3.5 57.6 -173.1 6.1671 3.3 1.8 Cyg X-1
263.1437 -33.7674 10.8 34.9 70.7 -1.0057 -1.1 8.7 GX 354-0
265.9443 -29.7994 3.7 32.1 77.3 2.2798 3.1 ------ UNKNOWN
263.1122 -57.8086 2.0 44.6 35.7 4.3793 5.7 ------ UNKNOWN
277.0884 -19.0394 3.2 22.4 102.3 1.8068 3.7 ------ UNKNOWN
292.4025 -72.3023 3.3 50.1 11.4 2.3154 3.5 ------ UNKNOWN
340.7245 -27.3154 2.3 36.4 -65.9 3.7455 5.1 ------ UNKNOWN
334.2474 7.4550 2.7 44.3 -120.5 6.5454 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.504000 19.040000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.8152 -37.7809 4.1 41.4 65.8 0.7339 2.8 9.0 4U 1700-377
256.5056 -36.3281 6.0 40.6 67.8 -0.4886 -1.9 6.6 GX 349+2
263.1066 -24.7425 19.5 34.5 86.6 0.0852 0.6 5.3 GX 1+4
264.7824 -44.3591 5.2 36.8 52.7 -0.2857 -2.2 5.7 4U 1735-44
268.4692 -1.3366 4.2 37.9 127.4 -0.4287 -2.7 9.2 SW J1753.5-0127
270.3401 -25.0930 63.2 28.0 86.4 -0.0188 -0.2 3.1 GX 5-1
270.2610 -25.7407 57.2 28.0 85.1 0.0211 0.2 2.2 GRS 1758-258
274.1268 -14.1690 5.1 26.6 111.5 0.2087 2.3 10.6 GX 17+2
275.8776 -30.5026 4.8 23.7 72.8 0.2130 2.4 8.5 H1820-303
284.9581 -25.0674 3.8 14.8 84.6 -0.2592 -3.1 9.8 HT1900.1-2455
288.7367 10.7851 6.9 35.3 167.2 0.1757 1.7 10.3 GRS 1915+105
299.5487 35.2768 7.8 57.7 -173.2 0.5205 1.5 5.0 Cyg X-1
263.1665 -33.8432 5.4 34.9 70.6 -0.2889 -2.1 8.9 GX 354-0
297.0983 -54.9909 2.3 32.7 12.0 0.5750 5.1 ------ UNKNOWN
317.7232 28.8233 3.2 53.8 -153.5 1.0845 3.6 ------ UNKNOWN
354.7237 -47.9979 0.4 49.6 -37.2 13.1304 28.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Fri Jun 20 16:58:07 EDT 2025