batgrbproduct analysis for trigger=1404126
batgrbproduct Analysis for Trigger=1404126
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 16 13:22:45 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1404126/batgroup_hand_proc
======================================================================
Trigger: 01404126 Segment: 000
BAT Trigger Time: 782171717.056 [s; MET]
Trigger Stop: 782171725.248 [s; MET]
UTC: 2025-10-14T21:54:40.550860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.917918787263 Dec: -41.839344253606 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: NO
Rate S/N Ratio: 8.71779788708135 [ if not an image trigger ]
Image S/N Ratio: 7.49
Flight Position: [ source = BAT ]
RA: 323.917918787263 Dec: -41.839344253606 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 323.932969251917 Dec: -41.8730518437922 [deg; J2000]
{ 21h 35m 43.9s , -41d 52' 23.0" }
+/- 2.72203076193821 [arcmin] (estimated 90% radius based on SNR)
+/- 1.24527146939522 [arcmin] (formal 1-sigma fit error)
SNR: 7.27516126255353
Angular difference between Flight and Ground position is 2.131363 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 286.975999951363 +/- 70.0941769025416
Measured from: 1.96800005435944
to: 288.944000005722 [s; relative to TRIGTIME]
T50: 191.571999907494 +/- 163.030265341405
Measured from: 7.89600002765656
to: 199.46799993515 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.18400001525879
to: 6.18400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.391999959945679
to: 310.103999972343 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.514556 0.570878 0.412010 0.154335
0.110454 0.114518 0.095855 0.078321 [error]
Peak 0.023396 0.012132 0.032301 0.008921
0.008443 0.008932 0.008101 0.006156 [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 1.73e-07 2.75e-07 3.29e-07 7.68e-07 9.99e-07 1.55e-06 erg/cm2
Error 5.59e-08 5.55e-08 9.80e-08 4.86e-07 2.29e-07 5.71e-07 erg/cm2
Peak flux Power-law 1.51e-01 1.72e-01 1.40e-01 1.92e-01 5.33e-01 6.55e-01 ph/cm2/s
Error 1.07e-01 7.94e-02 6.14e-02 1.73e-01 2.20e-01 2.59e-01 ph/cm2/s
Fluence Cutoff-PL 1.73e-07 2.75e-07 3.29e-07 7.64e-07 9.93e-07 1.49e-06 erg/cm2
Error 5.59e-08 5.52e-08 9.90e-08 7.06e-07 2.28e-07 6.56e-07 erg/cm2
Peak flux Cutoff-PL 1.15e-01 1.83e-01 1.60e-01 8.41e-02 5.12e-01 5.42e-01 ph/cm2/s
Error 1.30e-01 1.39e-01 8.91e-02 1.27e-01 2.56e-01 4.43e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- 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 1.740 0.377 - - 3.49e-04 7.70e-05 67.710 57
CPL 2.419 0.960 150.4 0.0 1.58e-04 0.00e+00 67.420 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.293 0.671 - - 4.48e-03 1.76e-03 57.820 57
CPL 0.206 0.874 93.1 0.0 1.39e-02 1.08e+02 57.350 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: 7.808000 sec.
T50 in the 50-300 keV band: 4.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 309.712 0.392 310.104
T90 286.976 1.968 288.944
T50 191.572 7.896 199.468
Peak 1.000 5.184 6.184
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
323.9330 -41.8731 0.0264 39.4 -27.7 0.9034 7.3 TRIG_01404126
------------------------------------------
Foreground time interval of the image:
0.392 50.845 (delta_t = 50.453 [sec])
Background time interval of the image:
-239.056 0.392 (delta_t = 239.448 [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 0.392 sec. to 310.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74010 ( -0.363125 0.391639 )
Norm@50keV : 3.49371E-04 ( -7.85955e-05 7.53445e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.567707e-01
Photon flux (15-150 keV) in 309.7 sec: 4.70697E-02 ( -0.00956504 0.00959735 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.9899e-07 ( -2.2687e-07 2.30182e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.392 sec. to 310.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41911 ( -1.76968 0.150175 )
Epeak [keV] : 150.394 ( )
Norm@50keV : 1.58179E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.42 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 56 degrees of freedom
# Null hypothesis probability = 1.411671e-01
Photon flux (15-150 keV) in 309.7 sec: 4.71307E-02 ( -0.0096667 0.0095291 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.9349e-07 ( -2.2265e-07 2.3356e-07 ) ergs/cm2
Band function
Time interval is from 0.392 sec. to 310.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.75814 ( 2.75814 2.75814 )
beta : -1.74011 ( -0.391143 0.363743 )
Epeak [keV] : 87.9686 ( -87.9686 -87.9686 )
Norm@50keV : 4.74843E-02 ( -0.0106822 0.0102405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 55 degrees of freedom
# Null hypothesis probability = 1.166824e-01
Photon flux (15-150 keV) in 309.7 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] : 14.5708 (-3.60492 4.79432)
R^2/D10^2 : 5.50275E-03 (-0.00351092 0.00979221)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.89 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 57 degrees of freedom
# Null hypothesis probability = 3.441737e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.608e-08 3.581e-08
25- 50 2.942e-07 1.166e-07
50-150 4.195e-07 2.070e-07
15-150 7.897e-07 3.066e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 153.337 (-87.1376 -150.519)
Norm : 0.190012 (-0.0413284 0.0651825)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.509e-07 8.687e-08
25- 50 2.805e-07 1.578e-07
50-150 5.587e-07 3.379e-07
15-150 9.900e-07 5.801e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.61643 (-1.53127 2.42215)
R1^2/D10^2 : 0.941247 (-0.852292 24.8179)
kT2 [keV] : 20.4483 (-5.66799 10.6431)
R2^2/D10^2 : 1.44039E-03 (-0.00110602 0.00188334)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.948e-07 1.072e-07
25- 50 2.228e-07 1.030e-07
50-150 5.601e-07 3.405e-07
15-150 9.777e-07 5.185e-07
Peak spectrum fit
Power-law model
Time interval is from 5.184 sec. to 6.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29267 ( -0.688176 0.653887 )
Norm@50keV : 4.47657E-03 ( -0.00176021 0.00175755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.82 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.446178e-01
Photon flux (15-150 keV) in 1 sec: 0.533353 ( -0.218552 0.221671 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.43164e-08 ( -1.82088e-08 1.84664e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.184 sec. to 6.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.206130 ( -0.20598 1.54103 )
Epeak [keV] : 93.0567 ( -93.0524 -93.0524 )
Norm@50keV : 1.39493E-02 ( -0.0139515 215.794 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.35 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.249427e-01
Photon flux (15-150 keV) in 1 sec: 0.512392 ( -0.284035 0.228318 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.28251e-08 ( -1.85409e-08 1.90503e-08 ) ergs/cm2
Band function
Time interval is from 5.184 sec. to 6.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.37943 ( -1.34142 3.82573 )
beta : -1.46465 ( 8.43557 18.4356 )
Epeak [keV] : 28.0611 ( -31.9564 267.299 )
Norm@50keV : 79.7102 ( -79.6767 106.482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.04 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.992701e-01
Photon flux (15-150 keV) in 1 sec: ( ) 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] : 19.1479 (-6.4963 11.9574)
R^2/D10^2 : 2.91677E-02 (-0.0291677 0.0885403)
(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 2.096e-09 1.415e-09
25- 50 1.014e-08 6.555e-09
50-150 2.735e-08 1.803e-08
15-150 3.959e-08 2.599e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.25980 (-0.894567 0.894588)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.627e-09 3.775e-09
25- 50 1.082e-08 6.965e-09
50-150 2.374e-08 1.477e-08
15-150 4.019e-08 2.663e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.96820 (-4.96211 185.039)
R1^2/D10^2 : 1.42460 (-1.43808 -1.43808)
kT2 [keV] : 22.3884 (-22.3856 -22.3856)
R2^2/D10^2 : 1.55565E-02 (-0.0155649 0.0689987)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.808e-09 2.855e-09
25- 50 9.818e-09 5.415e-09
50-150 2.873e-08 1.938e-08
15-150 4.336e-08 2.555e-08
Plot creation:
Thu Oct 16 13:38:30 EDT 2025