batgrbproduct analysis for trigger=1409824
batgrbproduct Analysis for Trigger=1409824
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): Mon Nov 10 14:18:13 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1409824/batgroup_hand_proc
======================================================================
Trigger: 01409824 Segment: 000
BAT Trigger Time: 783881232.96 [s; MET]
Trigger Stop: 783881233.472 [s; MET]
UTC: 2025-11-03T16:46:36.338960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 105.863587756866 Dec: -24.8433150687881 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.84
Image Trigger?: NO
Rate S/N Ratio: 30.935416596516 [ if not an image trigger ]
Image S/N Ratio: 11.84
Flight Position: [ source = BAT ]
RA: 105.863587756866 Dec: -24.8433150687881 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 105.869584541645 Dec: -24.8707957628099 [deg; J2000]
{ 07h 03m 28.7s , -24d 52' 14.9" }
+/- 1.03007936750309 [arcmin] (estimated 90% radius based on SNR)
+/- 0.314148878488829 [arcmin] (formal 1-sigma fit error)
SNR: 29.156251136988
Angular difference between Flight and Ground position is 1.680852 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 127.860000014305 +/- 22.4101913152097
Measured from: -43.2720000743866
to: 84.5879999399185 [s; relative to TRIGTIME]
T50: 21.5919998884201 +/- 4.63961253360151
Measured from: 0.53600001335144
to: 22.1279999017715 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.00399994850159
to: 3.00399994850159 [s; relative to TRIGTIME]
Total Fluence
Measured from: -52.0720000267029
to: 92.7439999580383 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.057077 2.442229 1.407337 0.321077
0.074173 0.076891 0.062790 0.049874 [error]
Peak 0.090980 0.124846 0.132324 0.032670
0.007725 0.008767 0.007768 0.005636 [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 6.33e-07 9.72e-07 1.12e-06 2.48e-06 3.46e-06 5.21e-06 erg/cm2
Error 4.40e-08 3.98e-08 6.38e-08 3.05e-07 1.48e-07 3.53e-07 erg/cm2
Peak flux Power-law 7.60e-01 9.24e-01 8.14e-01 1.23e+00 2.93e+00 3.73e+00 ph/cm2/s
Error 9.88e-02 7.28e-02 6.15e-02 1.99e-01 2.00e-01 2.61e-01 ph/cm2/s
Fluence Cutoff-PL 6.12e-07 9.89e-07 1.13e-06 1.84e-06 3.40e-06 4.57e-06 erg/cm2
Error 5.29e-08 4.72e-08 6.63e-08 7.20e-07 1.73e-07 7.46e-07 erg/cm2
Peak flux Cutoff-PL 7.29e-01 9.31e-01 8.17e-01 1.29e+00 2.93e+00 3.75e+00 ph/cm2/s
Error 1.14e-01 7.75e-02 7.08e-02 3.56e-01 2.05e-01 4.25e-01 ph/cm2/s
Fluence Band 5.90e-07 1.00e-06 1.11e-06 2.25e-06 3.40e-06 4.96e-06 erg/cm2
Error -------- -------- 6.66e-08 -------- -------- -------- 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 1.794 0.076 - - 2.60e-03 1.08e-04 82.100 57
CPL 1.604 0.278 101.5 -32.7 3.24e-03 1.06e-03 80.890 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.183 0.116 - - 2.50e-02 1.65e-03 48.180 57
CPL 1.090 0.285 503.1 0.0 2.76e-02 9.36e-03 48.210 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: 47.296000 sec.
T50 in the 50-300 keV band: 15.488000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 144.816 -52.072 92.744
T90 127.860 -43.272 84.588
T50 21.592 0.536 22.128
Peak 1.000 2.004 3.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
105.8696 -24.8708 0.0065 16.3 167.5 3.2403 29.2 TRIG_01409824
------------------------------------------
Foreground time interval of the image:
-52.072 11.341 (delta_t = 63.413 [sec])
Background time interval of the image:
-239.960 -52.072 (delta_t = 187.888 [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 -52.072 sec. to 92.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79407 ( -0.075713 0.0764192 )
Norm@50keV : 2.59518E-03 ( -0.000108611 0.000108144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.10 using 59 PHA bins.
# Reduced chi-squared = 1.440 for 57 degrees of freedom
# Null hypothesis probability = 1.641004e-02
Photon flux (15-150 keV) in 144.8 sec: 0.356791 ( -0.0149747 0.015017 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46023e-06 ( -1.47894e-07 1.48469e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -52.072 sec. to 92.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60415 ( -0.312313 0.244226 )
Epeak [keV] : 101.504 ( -36.0956 -101.505 )
Norm@50keV : 3.24302E-03 ( -0.000725909 0.00139963 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.89 using 59 PHA bins.
# Reduced chi-squared = 1.444 for 56 degrees of freedom
# Null hypothesis probability = 1.642820e-02
Photon flux (15-150 keV) in 144.8 sec: 0.352181 ( -0.016454 0.016488 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40319e-06 ( -1.73355e-07 1.72558e-07 ) ergs/cm2
Band function
Time interval is from -52.072 sec. to 92.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17987 ( 1.17099 5.40269 )
beta : -1.88344 ( 1.88342 0.128941 )
Epeak [keV] : 48.5740 ( -47.8568 140.468 )
Norm@50keV : 6.08463E-03 ( -0.00378996 447662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.97 using 59 PHA bins.
# Reduced chi-squared = 1.454 for 55 degrees of freedom
# Null hypothesis probability = 1.559359e-02
Photon flux (15-150 keV) in 144.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39846e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7456 ( )
R^2/D10^2 : 6.54182E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 227.62 using 59 PHA bins.
# Reduced chi-squared = 3.9934 for 57 degrees of freedom
# Null hypothesis probability = 2.999948e-22
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.264e-07 2.367e-08
25- 50 1.100e-06 5.191e-08
50-150 1.117e-06 9.781e-08
15-150 2.543e-06 1.187e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 112.844 (-18.0662 21.453)
Norm : 1.50626 (-0.0838676 0.0999418)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.693e-07 4.076e-08
25- 50 1.007e-06 5.321e-08
50-150 1.743e-06 4.387e-07
15-150 3.319e-06 4.757e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.78726 (-0.870494 0.920478)
R1^2/D10^2 : 0.471781 (-0.166094 0.300824)
kT2 [keV] : 24.3773 (-3.41689 5.08589)
R2^2/D10^2 : 4.49159E-03 (-0.00225348 0.00358311)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.571e-07 7.797e-08
25- 50 1.011e-06 9.709e-08
50-150 1.777e-06 3.144e-07
15-150 3.346e-06 3.859e-07
Peak spectrum fit
Power-law model
Time interval is from 2.004 sec. to 3.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18295 ( -0.116093 0.11492 )
Norm@50keV : 2.50093E-02 ( -0.00165182 0.00165155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.18 using 59 PHA bins.
# Reduced chi-squared = 0.8452 for 57 degrees of freedom
# Null hypothesis probability = 7.909866e-01
Photon flux (15-150 keV) in 1 sec: 2.92873 ( -0.199963 0.200278 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54966e-07 ( -1.85546e-08 1.86493e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.004 sec. to 3.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09026 ( -0.456628 0.11292 )
Epeak [keV] : 503.100 ( -865.086 -865.086 )
Norm@50keV : 2.76196E-02 ( -0.00290581 0.0158083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.21 using 59 PHA bins.
# Reduced chi-squared = 0.8610 for 56 degrees of freedom
# Null hypothesis probability = 7.608358e-01
Photon flux (15-150 keV) in 1 sec: 2.92668 ( -0.20953 0.19997 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54424e-07 ( -1.9355e-08 1.9131e-08 ) ergs/cm2
Band function
Time interval is from 2.004 sec. to 3.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97843 ( -4.97843 -4.97843 )
beta : -1.21710 ( -0.129006 0.123126 )
Epeak [keV] : 23.4191 ( -23.4191 4.8469 )
Norm@50keV : 2846.11 ( -187.68 6.1698e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.08 using 59 PHA bins.
# Reduced chi-squared = 0.8561 for 55 degrees of freedom
# Null hypothesis probability = 7.673237e-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] : 20.1022 (-1.76069 1.98505)
R^2/D10^2 : 0.133148 (-0.0353404 0.0469633)
(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 1.035e-08 1.421e-09
25- 50 5.173e-08 5.585e-09
50-150 1.551e-07 1.600e-08
15-150 2.172e-07 1.810e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-12.5897 -200)
Norm : 12.1188 (-0.81948 0.81948)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.017e-08 2.260e-09
25- 50 5.804e-08 5.300e-09
50-150 1.273e-07 4.012e-08
15-150 2.155e-07 3.300e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25268 (-1.31164 1.78688)
R1^2/D10^2 : 3.60030 (-2.07879 5.21872)
kT2 [keV] : 29.0211 (-4.19754 6.83179)
R2^2/D10^2 : 3.56766E-02 (-0.0176839 0.0197789)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.459e-08 8.385e-09
25- 50 5.075e-08 1.255e-08
50-150 1.781e-07 3.830e-08
15-150 2.534e-07 4.575e-08
Plot creation:
Mon Nov 10 14:24:31 EST 2025