batgrbproduct analysis for trigger=1400964
batgrbproduct Analysis for Trigger=1400964
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 4 04:26:27 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1400964/GCN5_download_cron
======================================================================
Trigger: 01400964 Segment: 000
BAT Trigger Time: 781149546.496 [s; MET]
Trigger Stop: 781149547.52 [s; MET]
UTC: 2025-10-03T01:58:30.060200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 18.5033597732436 Dec: 56.506574432146 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.18
Image Trigger?: NO
Rate S/N Ratio: 15.4596248337403 [ if not an image trigger ]
Image S/N Ratio: 8.18
Flight Position: [ source = BAT ]
RA: 18.5033597732436 Dec: 56.506574432146 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 18.5003139758246 Dec: 56.4811681015168 [deg; J2000]
{ 01h 14m 00.1s , +56d 28' 52.2" }
+/- 1.40505177213768 [arcmin] (estimated 90% radius based on SNR)
+/- 0.452815323869275 [arcmin] (formal 1-sigma fit error)
SNR: 18.7123934889274
Angular difference between Flight and Ground position is 1.527714 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 10.8279999494553 +/- 2.3444845501746
Measured from: -2.00399994850159
to: 8.82400000095367 [s; relative to TRIGTIME]
T50: 3.86799991130829 +/- 0.842472602693082
Measured from: 0.096000075340271
to: 3.96399998664856 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.907999992370605
to: 1.90799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.41200006008148
to: 9.78799998760223 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.227894 0.268653 0.177959 0.023077
0.019744 0.020220 0.016790 0.013126 [error]
Peak 0.028365 0.045095 0.045009 0.001917
0.005746 0.006176 0.005060 0.003791 [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 6.18e-08 1.05e-07 1.35e-07 3.52e-07 3.99e-07 6.55e-07 erg/cm2
Error 8.37e-09 8.82e-09 1.62e-08 8.88e-08 3.83e-08 1.03e-07 erg/cm2
Peak flux Power-law 2.62e-01 3.05e-01 2.54e-01 3.58e-01 9.50e-01 1.18e+00 ph/cm2/s
Error 6.36e-02 4.65e-02 3.87e-02 1.11e-01 1.30e-01 1.62e-01 ph/cm2/s
Fluence Cutoff-PL 5.99e-08 1.08e-07 1.37e-07 2.40e-07 3.91e-07 5.43e-07 erg/cm2
Error 9.68e-09 1.12e-08 1.70e-08 -------- 4.36e-08 1.30e-07 erg/cm2
Peak flux Cutoff-PL 2.03e-01 3.34e-01 2.84e-01 1.27e-01 9.09e-01 9.48e-01 ph/cm2/s
Error 8.13e-02 5.72e-02 4.90e-02 1.30e-01 1.38e-01 1.88e-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 1.632 0.150 - - 3.51e-03 3.12e-04 66.630 57
CPL 1.400 0.514 123.0 0.0 4.65e-03 0.00e+00 66.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.259 0.218 - - 8.02e-03 1.07e-03 70.470 57
CPL 0.047 1.267 84.9 118.4 3.07e-02 6.99e-02 66.710 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: 20.096000 sec.
T50 in the 50-300 keV band: 7.808000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.200 -2.412 9.788
T90 10.828 -2.004 8.824
T50 3.868 0.096 3.964
Peak 1.000 0.908 1.908
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
18.5003 +56.4812 0.0102 9.7 50.3 0.7245 18.7 TRIG_01400964
------------------------------------------
Foreground time interval of the image:
-2.412 9.788 (delta_t = 12.200 [sec])
Background time interval of the image:
-239.496 -136.106 (delta_t = 103.390 [sec])
-135.496 -33.361 (delta_t = 102.135 [sec])
-32.496 -2.412 (delta_t = 30.084 [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 -2.412 sec. to 9.788 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63155 ( -0.148581 0.151333 )
Norm@50keV : 3.50914E-03 ( -0.000313267 0.000310011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.63 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 57 degrees of freedom
# Null hypothesis probability = 1.794669e-01
Photon flux (15-150 keV) in 12.2 sec: 0.455459 ( -0.0381531 0.0381865 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.98931e-07 ( -3.8055e-08 3.84606e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.412 sec. to 9.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40008 ( -0.665008 0.362718 )
Epeak [keV] : 123.012 ( )
Norm@50keV : 4.65122E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.20 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 56 degrees of freedom
# Null hypothesis probability = 1.653440e-01
Photon flux (15-150 keV) in 12.2 sec: 0.450666 ( -0.040193 0.039985 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90796e-07 ( -4.37748e-08 4.34759e-08 ) ergs/cm2
Band function
Time interval is from -2.412 sec. to 9.788 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30588 ( 1.3059 5.30016 )
beta : -1.90543 ( 1.90221 0.399119 )
Epeak [keV] : 98.1863 ( -98.1768 157.816 )
Norm@50keV : 5.24672E-03 ( -0.00154833 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.481374e-01
Photon flux (15-150 keV) in 12.2 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] : 13.2892 (-1.3501 1.52512)
R^2/D10^2 : 7.68208E-02 (-0.0249289 0.0363703)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.72 using 59 PHA bins.
# Reduced chi-squared = 1.714 for 57 degrees of freedom
# Null hypothesis probability = 6.390875e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.508e-08 5.234e-09
25- 50 1.237e-07 1.340e-08
50-150 1.399e-07 2.439e-08
15-150 2.987e-07 3.379e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 156.537 (-51.4344 -156.567)
Norm : 1.87478 (-0.172119 0.20082)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.852e-08 6.564e-09
25- 50 1.091e-07 3.652e-08
50-150 2.192e-07 1.018e-07
15-150 3.869e-07 1.378e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.96991 (-1.93042 2.65456)
R1^2/D10^2 : 0.825871 (-0.561929 2.91719)
kT2 [keV] : 21.4134 (-4.70852 14.0061)
R2^2/D10^2 : 1.10025E-02 (-0.00919552 0.0181693)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.890e-08 2.622e-08
25- 50 1.067e-07 3.342e-08
50-150 2.095e-07 1.010e-07
15-150 3.751e-07 1.376e-07
Peak spectrum fit
Power-law model
Time interval is from 0.908 sec. to 1.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25905 ( -0.219484 0.215601 )
Norm@50keV : 8.02121E-03 ( -0.00106522 0.00106517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.47 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 57 degrees of freedom
# Null hypothesis probability = 1.083918e-01
Photon flux (15-150 keV) in 1 sec: 0.950122 ( -0.130058 0.130357 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.00866e-08 ( -1.15501e-08 1.16387e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.908 sec. to 1.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.71604E-02 ( -1.45938 1.07442 )
Epeak [keV] : 84.9356 ( -21.108 215.684 )
Norm@50keV : 3.06833E-02 ( -0.0306835 0.109191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.71 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 56 degrees of freedom
# Null hypothesis probability = 1.548902e-01
Photon flux (15-150 keV) in 1 sec: 0.908805 ( -0.138612 0.137025 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.47405e-08 ( -1.25159e-08 1.27412e-08 ) ergs/cm2
Band function
Time interval is from 0.908 sec. to 1.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.253346 ( -1.10159 2.28636 )
beta : -2.30731 ( 2.24244 0.906368 )
Epeak [keV] : 76.9540 ( -31.011 160.101 )
Norm@50keV : 4.32341E-02 ( -0.0231555 0.370745 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.27 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 55 degrees of freedom
# Null hypothesis probability = 1.419561e-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] : 17.5363 (-2.33171 2.84942)
R^2/D10^2 : 6.98269E-02 (-0.0283715 0.0444098)
(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 4.334e-09 1.095e-09
25- 50 1.965e-08 3.640e-09
50-150 4.356e-08 1.013e-08
15-150 6.754e-08 1.253e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-45.8209 -200)
Norm : 3.96910 (-0.533194 0.533194)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.884e-09 5.580e-09
25- 50 1.901e-08 1.062e-08
50-150 4.170e-08 2.325e-08
15-150 7.060e-08 3.917e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.14355 (-3.89403 16.4304)
R1^2/D10^2 : 3.19509 (-3.13066 875.421)
kT2 [keV] : 19.3129 (-3.15141 -19.3159)
R2^2/D10^2 : 4.75921E-02 (-0.0449433 0.0163482)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.907e-09 3.245e-09
25- 50 1.824e-08 5.983e-09
50-150 4.642e-08 1.861e-08
15-150 7.157e-08 2.120e-08
Plot creation:
Sat Oct 4 04:32:01 EDT 2025