batgrbproduct analysis for trigger=1406589
batgrbproduct Analysis for Trigger=1406589
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 25 13:58:14 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1406589/GCN5_download_cron
======================================================================
Trigger: 01406589 Segment: 000
BAT Trigger Time: 783020858.816 [s; MET]
Trigger Stop: 783020867.008 [s; MET]
UTC: 2025-10-24T17:47:02.253280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 306.621925670365 Dec: -68.5740620919185 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 10.1980390271856 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 306.621925670365 Dec: -68.5740620919185 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.665617071354 Dec: -68.5762073642309 [deg; J2000]
{ 20h 26m 39.7s , -68d 34' 34.3" }
+/- 2.43723830225427 [arcmin] (estimated 90% radius based on SNR)
+/- 1.14104603242002 [arcmin] (formal 1-sigma fit error)
SNR: 8.51935977642062
Angular difference between Flight and Ground position is 0.966190 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 82.663999915123 +/- 23.2723680334212
Measured from: 2.03600013256073
to: 84.7000000476837 [s; relative to TRIGTIME]
T50: 23.2399998903275 +/- 30.4549050197718
Measured from: 6.82800018787384
to: 30.0680000782013 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.15600001811981
to: 3.15600001811981 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.1599999666214
to: 97.2799999713898 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.395601 0.355552 0.293509 0.106324
0.059807 0.061811 0.051647 0.042933 [error]
Peak 0.024127 0.016112 0.012885 0.008492
0.006542 0.007020 0.005757 0.004605 [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 1.05e-07 1.74e-07 2.17e-07 5.41e-07 6.48e-07 1.04e-06 erg/cm2
Error 2.69e-08 2.77e-08 5.30e-08 2.81e-07 1.23e-07 3.27e-07 erg/cm2
Peak flux Power-law 2.10e-01 1.71e-01 9.42e-02 7.63e-02 5.09e-01 5.51e-01 ph/cm2/s
Error 1.10e-01 5.39e-02 7.51e-02 1.03e-01 1.60e-01 1.83e-01 ph/cm2/s
Fluence Cutoff-PL 1.05e-07 1.74e-07 2.17e-07 5.34e-07 6.47e-07 1.03e-06 erg/cm2
Error 2.69e-08 2.78e-08 5.29e-08 3.41e-07 1.21e-07 3.69e-07 erg/cm2
Peak flux Cutoff-PL 2.26e-01 1.69e-01 8.41e-02 5.99e-02 5.07e-01 5.38e-01 ph/cm2/s
Error 1.11e-01 5.55e-02 5.78e-02 1.11e-01 1.61e-01 1.86e-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 1.676 0.304 - - 7.26e-04 1.29e-04 61.460 57
CPL 1.680 0.305 9999.4 -0.0 7.27e-04 4.85e-04 61.470 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.858 0.834 - - 3.61e-03 1.62e-03 55.810 57
CPL 1.953 0.899 9999.3 0.0 3.46e-03 0.00e+00 55.850 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: 73.856000 sec.
T50 in the 50-300 keV band: 35.776000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 96.120 1.160 97.280
T90 82.664 2.036 84.700
T50 23.240 6.828 30.068
Peak 1.000 2.156 3.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.6656 -68.5762 0.0226 22.2 -41.1 0.7455 8.5 TRIG_01406589
------------------------------------------
Foreground time interval of the image:
1.160 51.485 (delta_t = 50.325 [sec])
Background time interval of the image:
-239.816 1.160 (delta_t = 240.976 [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 1.160 sec. to 97.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67602 ( -0.297027 0.309998 )
Norm@50keV : 7.26483E-04 ( -0.000131164 0.000126788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.192896e-01
Photon flux (15-150 keV) in 96.12 sec: 9.56911E-02 ( -0.0152686 0.0152845 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47841e-07 ( -1.21826e-07 1.24418e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.160 sec. to 97.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67967 ( -0.303448 0.306669 )
Epeak [keV] : 9999.35 ( -9999.35 -9999.36 )
Norm@50keV : 7.26736E-04 ( -0.000131177 0.000839193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.47 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.865833e-01
Photon flux (15-150 keV) in 96.12 sec: 9.58460E-02 ( -0.0153985 0.015157 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47297e-07 ( -1.21062e-07 1.21356e-07 ) ergs/cm2
Band function
Time interval is from 1.160 sec. to 97.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20541 ( 1.20607 1.20607 )
beta : -1.69466 ( 1.69342 0.313505 )
Epeak [keV] : 42.6984 ( -41.4471 -41.4471 )
Norm@50keV : 1.62540E-03 ( -0.00174847 129634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.44 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Null hypothesis probability = 2.562927e-01
Photon flux (15-150 keV) in 96.12 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] : 11.4121 (-2.93313 4.51414)
R^2/D10^2 : 2.64887E-02 (-0.0259514 0.0524187)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.65 using 59 PHA bins.
# Reduced chi-squared = 1.415 for 57 degrees of freedom
# Null hypothesis probability = 2.134004e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.973e-08 2.641e-08
25- 50 2.065e-07 6.118e-08
50-150 1.562e-07 6.129e-08
15-150 4.324e-07 1.093e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 156.429 (-83.4253 -157.099)
Norm : 0.389978 (-0.0671237 0.0935268)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.592e-08 5.460e-08
25- 50 1.789e-07 9.823e-08
50-150 3.591e-07 2.152e-07
15-150 6.339e-07 3.615e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.02265 (-1.54136 2.01193)
R1^2/D10^2 : 0.228867 (-0.151231 0.515791)
kT2 [keV] : 33.2977 (-12.4227 59.2798)
R2^2/D10^2 : 5.42136E-04 (-0.000494595 0.00193193)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.151e-07 6.316e-08
25- 50 1.615e-07 8.008e-08
50-150 4.155e-07 2.381e-07
15-150 6.920e-07 3.514e-07
Peak spectrum fit
Power-law model
Time interval is from 2.156 sec. to 3.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85782 ( -0.751021 0.916738 )
Norm@50keV : 3.60889E-03 ( -0.00179715 0.00144865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.81 using 59 PHA bins.
# Reduced chi-squared = 0.9791 for 57 degrees of freedom
# Null hypothesis probability = 5.197543e-01
Photon flux (15-150 keV) in 1 sec: 0.508892 ( -0.160494 0.160486 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31587e-08 ( -1.41834e-08 1.4815e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.156 sec. to 3.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95321 ( -0.958719 0.838542 )
Epeak [keV] : 9999.34 ( )
Norm@50keV : 3.45543E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 56 degrees of freedom
# Null hypothesis probability = 4.804897e-01
Photon flux (15-150 keV) in 1 sec: 0.507162 ( -0.160213 0.161215 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20462e-08 ( -1.31762e-08 1.59867e-08 ) ergs/cm2
Band function
Time interval is from 2.156 sec. to 3.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39198 ( 1.43349 1.43349 )
beta : -1.83349 ( 1.85158 0.745156 )
Epeak [keV] : 21.1767 ( -15.4111 -15.4111 )
Norm@50keV : 9.52565E-03 ( -0.0102019 69.8848 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.82 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.439111e-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] : 5.81164 (-2.13828 4.51042)
R^2/D10^2 : 1.81861 (-1.81498 12.3669)
(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 7.785e-09 4.806e-09
25- 50 7.236e-09 4.744e-09
50-150 5.804e-10 6.375e-10
15-150 1.560e-08 1.050e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 191.133 (-191.13 -191.13)
Norm : 1.98658 (-0.649454 1.37238)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.974e-09 3.078e-09
25- 50 9.520e-09 5.850e-09
50-150 2.058e-08 1.254e-08
15-150 3.508e-08 2.086e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.98121 (-1.82835 2.54955)
R1^2/D10^2 : 3.29210 (-2.73053 27.3292)
kT2 [keV] : 193.935 (-194.643 -194.644)
R2^2/D10^2 : 1.10297E-04 (-5.33893e-05 0.00387203)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.978e-09 4.810e-09
25- 50 6.377e-09 3.679e-09
50-150 2.894e-08 2.380e-08
15-150 4.329e-08 2.976e-08
Plot creation:
Sat Oct 25 14:01:33 EDT 2025