batgrbproduct analysis for trigger=1400467
batgrbproduct Analysis for Trigger=1400467
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Thu Oct 2 15:06:29 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1400467/GCN5_download_cron
======================================================================
Trigger: 01400467 Segment: 000
BAT Trigger Time: 781021076.992 [s; MET]
Trigger Stop: 781021078.016 [s; MET]
UTC: 2025-10-01T14:17:20.564920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 42.6648456009598 Dec: -23.0195992140744 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.73
Image Trigger?: NO
Rate S/N Ratio: 15.3948043183407 [ if not an image trigger ]
Image S/N Ratio: 7.73
Flight Position: [ source = BAT ]
RA: 42.6648456009598 Dec: -23.0195992140744 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 42.6676048611929 Dec: -22.9899761196683 [deg; J2000]
{ 02h 50m 40.2s , -22d 59' 23.9" }
+/- 1.14068361032225 [arcmin] (estimated 90% radius based on SNR)
+/- 0.395799156195943 [arcmin] (formal 1-sigma fit error)
SNR: 25.203090933872
Angular difference between Flight and Ground position is 1.783906 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 75.3279999494553 +/- 46.9026129425002
Measured from: -3.19199991226196
to: 72.1360000371933 [s; relative to TRIGTIME]
T50: 13.2479999065399 +/- 3.50133240148566
Measured from: 1.28800010681152
to: 14.5360000133514 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.29200005531311
to: 3.29200005531311 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.97599995136261
to: 91.7200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.477597 0.645012 0.561159 0.060634
0.051346 0.053760 0.045418 0.037252 [error]
Peak 0.022122 0.039267 0.041946 0.007871
0.005528 0.005920 0.005366 0.003897 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.46e-07 2.71e-07 3.87e-07 1.17e-06 1.10e-06 1.97e-06 erg/cm2
Error 2.09e-08 2.43e-08 4.35e-08 2.76e-07 1.07e-07 3.11e-07 erg/cm2
Peak flux Power-law 2.35e-01 2.71e-01 2.25e-01 3.15e-01 8.45e-01 1.05e+00 ph/cm2/s
Error 6.35e-02 4.72e-02 4.02e-02 1.12e-01 1.34e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-07 2.96e-07 4.08e-07 3.97e-07 1.04e-06 1.23e-06 erg/cm2
Error 2.51e-08 3.07e-08 4.96e-08 3.11e-07 1.14e-07 3.26e-07 erg/cm2
Peak flux Cutoff-PL 1.70e-01 2.99e-01 2.61e-01 1.06e-01 8.07e-01 8.37e-01 ph/cm2/s
Error 7.84e-02 5.74e-02 5.24e-02 -------- 1.38e-01 1.66e-01 ph/cm2/s
Fluence Band 1.27e-07 2.92e-07 4.08e-07 4.36e-07 1.05e-06 1.27e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.71e-01 2.99e-01 2.61e-01 1.08e-01 8.08e-01 8.39e-01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.487 0.144 - - 1.14e-03 1.01e-04 57.670 57
CPL 0.640 0.655 80.4 45.6 3.05e-03 2.59e-03 51.720 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.268 0.244 - - 7.12e-03 1.10e-03 61.700 57
CPL -0.155 1.298 82.0 54.7 3.32e-02 7.14e-02 56.600 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 13.696000 sec.
T50 in the 50-300 keV band: 6.848000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 101.696 -9.976 91.720
T90 75.328 -3.192 72.136
T50 13.248 1.288 14.536
Peak 1.000 2.292 3.292
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
42.6676 -22.9900 0.0076 22.5 168.5 1.3938 25.2 TRIG_01400467
------------------------------------------
Foreground time interval of the image:
-9.976 16.709 (delta_t = 26.685 [sec])
Background time interval of the image:
-239.992 -9.976 (delta_t = 230.016 [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
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)
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 -9.976 sec. to 91.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48658 ( -0.14372 0.144775 )
Norm@50keV : 1.14184E-03 ( -0.000100693 0.000100308 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.67 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.503479e-01
Photon flux (15-150 keV) in 101.7 sec: 0.142038 ( -0.012415 0.0124295 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10409e-06 ( -1.06089e-07 1.0694e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.976 sec. to 91.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.640313 ( -0.702886 0.607049 )
Epeak [keV] : 80.3574 ( -17.2373 73.9358 )
Norm@50keV : 3.05185E-03 ( -0.00151641 0.00366043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.72 using 59 PHA bins.
# Reduced chi-squared = 0.9235 for 56 degrees of freedom
# Null hypothesis probability = 6.376674e-01
Photon flux (15-150 keV) in 101.7 sec: 0.137237 ( -0.012927 0.012905 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04271e-06 ( -1.13451e-07 1.15328e-07 ) ergs/cm2
Band function
Time interval is from -9.976 sec. to 91.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.640206 ( -0.243949 0.689043 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 80.3396 ( -14.4119 73.7426 )
Norm@50keV : 3.05223E-03 ( -0.00151696 0.00366236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.72 using 59 PHA bins.
# Reduced chi-squared = 0.9403 for 55 degrees of freedom
# Null hypothesis probability = 6.009071e-01
Photon flux (15-150 keV) in 101.7 sec: 0.138347 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05153e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.4558 (-1.49154 1.67062)
R^2/D10^2 : 1.49205E-02 (-0.00454423 0.00643525)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.51 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 57 degrees of freedom
# Null hypothesis probability = 1.237364e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.549e-08 1.265e-08
25- 50 3.082e-07 3.615e-08
50-150 5.075e-07 8.955e-08
15-150 8.912e-07 9.590e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-57.1008 -200)
Norm : 0.585107 (-0.0499242 0.0499242)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.482e-07 1.592e-08
25- 50 2.851e-07 4.526e-08
50-150 6.252e-07 2.082e-07
15-150 1.058e-06 4.074e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.50481 (-1.69807 2.33705)
R1^2/D10^2 : 0.261783 (-0.1842 0.768398)
kT2 [keV] : 20.0067 (-2.95188 4.76044)
R2^2/D10^2 : 5.20088E-03 (-0.00297323 0.00441611)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.345e-07 6.635e-08
25- 50 2.803e-07 9.458e-08
50-150 6.082e-07 2.254e-07
15-150 1.023e-06 3.144e-07
Peak spectrum fit
Power-law model
Time interval is from 2.292 sec. to 3.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26786 ( -0.244717 0.242871 )
Norm@50keV : 7.12192E-03 ( -0.0011044 0.00110399 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.70 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.116836e-01
Photon flux (15-150 keV) in 1 sec: 0.844849 ( -0.133748 0.134075 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0944e-08 ( -1.1964e-08 1.20803e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.292 sec. to 3.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.155340 ( -1.48891 1.10755 )
Epeak [keV] : 82.0487 ( -18.5603 90.7854 )
Norm@50keV : 3.32284E-02 ( -0.0332249 0.10964 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.525558e-01
Photon flux (15-150 keV) in 1 sec: 0.807486 ( -0.138094 0.137901 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.69216e-08 ( -1.2226e-08 1.25478e-08 ) ergs/cm2
Band function
Time interval is from 2.292 sec. to 3.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.136265 ( -1.0208 1.29879 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 82.6679 ( -17.1155 48.8624 )
Norm@50keV : 3.24499E-02 ( -0.0324406 70.6365 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.151033e-01
Photon flux (15-150 keV) in 1 sec: 0.808468 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82925e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.3421 (-2.77738 3.34502)
R^2/D10^2 : 5.44633E-02 (-0.023721 0.0401996)
(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 3.646e-09 1.096e-09
25- 50 1.710e-08 3.760e-09
50-150 4.195e-08 1.132e-08
15-150 6.270e-08 1.480e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-56.5868 -200)
Norm : 3.52003 (-0.549898 0.549898)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.765e-09 5.030e-09
25- 50 1.686e-08 9.385e-09
50-150 3.698e-08 2.103e-08
15-150 6.261e-08 3.535e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.59332 (-2.97597 4.31494)
R1^2/D10^2 : 0.947947 (-0.912403 7.0268)
kT2 [keV] : 20.9538 (-3.93263 7.86021)
R2^2/D10^2 : 3.16860E-02 (-0.0245195 0.0297198)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.168e-09 3.524e-09
25- 50 1.652e-08 8.565e-09
50-150 4.439e-08 2.639e-08
15-150 6.708e-08 3.662e-08
Plot creation:
Thu Oct 2 15:10:04 EDT 2025