batgrbproduct analysis for trigger=1404904
batgrbproduct Analysis for Trigger=1404904
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): Sat Oct 18 20:08:44 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1404904/batgroup_hand_proc
======================================================================
Trigger: 01404904 Segment: 000
BAT Trigger Time: 782383281.152 [s; MET]
Trigger Stop: 782383282.176 [s; MET]
UTC: 2025-10-17T08:40:44.632520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 335.386417470042 Dec: 7.05068725437213 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.52
Image Trigger?: NO
Rate S/N Ratio: 15.7162336455017 [ if not an image trigger ]
Image S/N Ratio: 9.52
Flight Position: [ source = BAT ]
RA: 335.386417470042 Dec: 7.05068725437213 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 335.404195153812 Dec: 7.04843941039666 [deg; J2000]
{ 22h 21m 37.0s , +07d 02' 54.4" }
+/- 1.26282457891258 [arcmin] (estimated 90% radius based on SNR)
+/- 0.435853674642934 [arcmin] (formal 1-sigma fit error)
SNR: 21.7942851268771
Angular difference between Flight and Ground position is 1.067154 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 116.896000027657 +/- 61.9135087019101
Measured from: -2.16799998283386
to: 114.728000044823 [s; relative to TRIGTIME]
T50: 15.6800000667572 +/- 8.32178823988608
Measured from: 2.15200006961823
to: 17.8320001363754 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.41200006008148
to: 7.41200006008148 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.4799998998642
to: 125.080000042915 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.480279 0.721431 0.528098 0.158661
0.065598 0.068529 0.057903 0.048578 [error]
Peak 0.035327 0.064304 0.050826 0.010245
0.006332 0.007123 0.006353 0.004772 [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 1.44e-07 2.82e-07 4.29e-07 1.42e-06 1.20e-06 2.27e-06 erg/cm2
Error 2.82e-08 3.20e-08 5.82e-08 4.40e-07 1.41e-07 4.76e-07 erg/cm2
Peak flux Power-law 3.44e-01 4.10e-01 3.53e-01 5.17e-01 1.29e+00 1.62e+00 ph/cm2/s
Error 7.56e-02 5.67e-02 4.93e-02 1.47e-01 1.60e-01 2.08e-01 ph/cm2/s
Fluence Cutoff-PL 1.45e-07 2.83e-07 4.28e-07 1.39e-06 1.20e-06 2.25e-06 erg/cm2
Error 2.39e-08 3.06e-08 5.81e-08 2.76e-07 1.34e-07 7.24e-07 erg/cm2
Peak flux Cutoff-PL 3.11e-01 4.33e-01 3.73e-01 2.87e-01 1.27e+00 1.40e+00 ph/cm2/s
Error 8.73e-02 6.74e-02 5.81e-02 -------- 1.62e-01 2.03e-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 1.396 0.197 - - 9.53e-04 9.91e-05 58.860 57
CPL 2.392 0.343 133.6 0.0 2.82e-04 0.00e+00 54.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.217 0.198 - - 1.10e-02 1.33e-03 61.690 57
CPL 0.668 0.803 125.8 0.0 2.05e-02 0.00e+00 60.130 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: 22.208000 sec.
T50 in the 50-300 keV band: 6.592000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 130.560 -5.480 125.080
T90 116.896 -2.168 114.728
T50 15.680 2.152 17.832
Peak 1.000 6.412 7.412
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
335.4042 +7.0484 0.0088 21.1 -0.8 1.3200 21.8 TRIG_01404904
------------------------------------------
Foreground time interval of the image:
-5.480 15.949 (delta_t = 21.429 [sec])
Background time interval of the image:
-60.152 -5.480 (delta_t = 54.672 [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 -5.480 sec. to 125.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39628 ( -0.198098 0.196119 )
Norm@50keV : 9.53236E-04 ( -9.92594e-05 9.892e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.86 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.072219e-01
Photon flux (15-150 keV) in 130.6 sec: 0.115989 ( -0.0123332 0.0123618 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20384e-06 ( -1.40322e-07 1.41489e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.480 sec. to 125.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39203 ( -0.562586 0.122641 )
Epeak [keV] : 133.559 ( )
Norm@50keV : 2.81580E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.55 using 59 PHA bins.
# Reduced chi-squared = 0.9742 for 56 degrees of freedom
# Null hypothesis probability = 5.297754e-01
Photon flux (15-150 keV) in 130.6 sec: 0.115951 ( -0.012349 0.012343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20132e-06 ( -1.37757e-07 1.31168e-07 ) ergs/cm2
Band function
Time interval is from -5.480 sec. to 125.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17743 ( 1.17742 1.17742 )
beta : -1.39620 ( -0.196122 0.198276 )
Epeak [keV] : 20.8335 ( -20.8274 -20.8274 )
Norm@50keV : 1.91966E-03 ( -0.001065 0.00708597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.86 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.361303e-01
Photon flux (15-150 keV) in 130.6 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] : 16.1108 (-3.24355 4.65416)
R^2/D10^2 : 9.74714E-03 (-0.00545182 0.011483)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.68 using 59 PHA bins.
# Reduced chi-squared = 1.8891 for 57 degrees of freedom
# Null hypothesis probability = 5.757973e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.821e-08 1.574e-08
25- 50 2.887e-07 4.754e-08
50-150 5.252e-07 1.075e-07
15-150 8.821e-07 1.394e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-44.4577 -200)
Norm : 0.476199 (-0.0494326 0.0494326)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.549e-07 4.361e-08
25- 50 2.979e-07 1.601e-07
50-150 6.534e-07 3.465e-07
15-150 1.106e-06 5.825e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30115 (-1.34805 1.56313)
R1^2/D10^2 : 0.127228 (-0.0642974 0.144229)
kT2 [keV] : 54.6217 (-19.5321 97.4755)
R2^2/D10^2 : 2.14996E-04 (-0.000156318 0.000465453)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.569e-07 6.036e-08
25- 50 2.830e-07 8.580e-08
50-150 8.763e-07 4.422e-07
15-150 1.316e-06 5.113e-07
Peak spectrum fit
Power-law model
Time interval is from 6.412 sec. to 7.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21720 ( -0.199575 0.196047 )
Norm@50keV : 1.09564E-02 ( -0.00132821 0.00132796 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.69 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.120339e-01
Photon flux (15-150 keV) in 1 sec: 1.28926 ( -0.159625 0.159839 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10623e-07 ( -1.47638e-08 1.48814e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.412 sec. to 7.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.668391 ( -0.896205 0.709206 )
Epeak [keV] : 125.848 ( )
Norm@50keV : 2.05189E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.285563e-01
Photon flux (15-150 keV) in 1 sec: 1.26986 ( -0.16235 0.16224 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06993e-07 ( -1.61105e-08 1.5892e-08 ) ergs/cm2
Band function
Time interval is from 6.412 sec. to 7.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.87641 ( -4.34043 -3.72098 )
beta : -1.44487 ( -0.392804 0.312752 )
Epeak [keV] : 36.3555 ( -20.5031 61.6652 )
Norm@50keV : 5.95242 ( -5.94793 102.58 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.47 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.492536e-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] : 17.3516 (-2.67173 3.32304)
R^2/D10^2 : 9.58920E-02 (-0.0425477 0.0728798)
(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 5.846e-09 1.421e-09
25- 50 2.629e-08 5.465e-09
50-150 5.687e-08 1.358e-08
15-150 8.900e-08 1.752e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-37.4362 -200)
Norm : 5.32481 (-0.656548 0.656548)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.326e-08 7.515e-09
25- 50 2.550e-08 1.407e-08
50-150 5.593e-08 3.109e-08
15-150 9.469e-08 5.235e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.69680 (-3.00298 3.61869)
R1^2/D10^2 : 0.439874 (-0.256756 0.469984)
kT2 [keV] : 37.4133 (-12.0517 -37.4211)
R2^2/D10^2 : 5.71639E-03 (-0.00514935 0.0228781)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.412e-09 5.104e-09
25- 50 2.705e-08 1.438e-08
50-150 7.296e-08 3.957e-08
15-150 1.094e-07 5.365e-08
Plot creation:
Sat Oct 18 20:18:20 EDT 2025