batgrbproduct analysis for trigger=1403878
batgrbproduct Analysis for Trigger=1403878
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): Wed Oct 15 04:47:19 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1403878/GCN5_download_cron
======================================================================
Trigger: 01403878 Segment: 000
BAT Trigger Time: 782094546.688 [s; MET]
Trigger Stop: 782094547.2 [s; MET]
UTC: 2025-10-14T00:28:30.188100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 111.732320098319 Dec: 6.41506468241977 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.27
Image Trigger?: NO
Rate S/N Ratio: 23.5159520326097 [ if not an image trigger ]
Image S/N Ratio: 13.27
Flight Position: [ source = BAT ]
RA: 111.732320098319 Dec: 6.41506468241977 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 111.727934125823 Dec: 6.41964612819715 [deg; J2000]
{ 07h 26m 54.7s , +06d 25' 10.7" }
+/- 1.29862182114952 [arcmin] (estimated 90% radius based on SNR)
+/- 0.455692519057237 [arcmin] (formal 1-sigma fit error)
SNR: 20.9411362554302
Angular difference between Flight and Ground position is 0.379407 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 1.56400001049042 +/- 0.242528281735481
Measured from: 0.0200001001358032
to: 1.58400011062622 [s; relative to TRIGTIME]
T50: 0.631999969482422 +/- 0.12560255172349
Measured from: 0.284000158309937
to: 0.916000127792358 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0740000009536743
to: 0.925999999046326 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0719999074935913
to: 1.82400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.151355 0.201374 0.092171 0.018759
0.011189 0.012006 0.009557 0.006985 [error]
Peak 0.105029 0.147069 0.082239 0.014404
0.008531 0.009528 0.007707 0.005175 [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 5.05e-08 7.28e-08 7.81e-08 1.56e-07 2.50e-07 3.57e-07 erg/cm2
Error 5.43e-09 5.38e-09 9.05e-09 3.57e-08 2.13e-08 4.53e-08 erg/cm2
Peak flux Power-law 1.09e+00 9.48e-01 5.64e-01 5.04e-01 2.82e+00 3.11e+00 ph/cm2/s
Error 1.28e-01 7.47e-02 6.16e-02 1.05e-01 2.22e-01 2.44e-01 ph/cm2/s
Fluence Cutoff-PL 4.54e-08 8.26e-08 7.63e-08 3.45e-08 2.28e-07 2.39e-07 erg/cm2
Error 6.30e-09 7.88e-09 1.09e-08 -------- 2.36e-08 3.86e-08 erg/cm2
Peak flux Cutoff-PL 9.64e-01 1.06e+00 5.89e-01 1.78e-01 2.74e+00 2.79e+00 ph/cm2/s
Error 1.50e-01 1.01e-01 7.17e-02 1.14e-01 2.27e-01 2.50e-01 ph/cm2/s
Fluence Band 4.44e-08 8.33e-08 7.42e-08 6.86e-08 2.32e-07 2.72e-07 erg/cm2
Error 6.41e-09 8.29e-09 1.12e-08 -------- 2.40e-08 -------- erg/cm2
Peak flux Band 9.26e-01 1.06e+00 5.85e-01 2.52e-01 2.71e+00 2.82e+00 ph/cm2/s
Error 1.56e-01 -------- -------- -------- 2.25e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.899 0.130 - - 1.43e-02 1.23e-03 69.470 57
CPL 0.820 0.696 47.1 9.2 5.81e-02 6.42e-02 60.500 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.750 0.129 - - 2.09e-02 1.79e-03 59.220 57
CPL 0.770 0.632 57.3 15.2 7.14e-02 6.58e-02 50.320 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: 0.896000 sec.
T50 in the 50-300 keV band: 0.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.896 -0.072 1.824
T90 1.564 0.020 1.584
T50 0.632 0.284 0.916
Peak 1.000 -0.074 0.926
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
111.7279 +6.4196 0.0092 17.5 -82.1 0.4588 20.9 TRIG_01403878
------------------------------------------
Foreground time interval of the image:
-0.072 1.824 (delta_t = 1.896 [sec])
Background time interval of the image:
-239.688 -0.072 (delta_t = 239.616 [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 -0.072 sec. to 1.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89925 ( -0.127504 0.131639 )
Norm@50keV : 1.43232E-02 ( -0.00124041 0.0012248 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.47 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 57 degrees of freedom
# Null hypothesis probability = 1.243478e-01
Photon flux (15-150 keV) in 1.896 sec: 2.05488 ( -0.153245 0.15332 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49669e-07 ( -2.12299e-08 2.14413e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.072 sec. to 1.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.820289 ( -0.749829 0.641812 )
Epeak [keV] : 47.1478 ( -6.67764 11.7668 )
Norm@50keV : 5.81167E-02 ( -0.0325524 0.0958161 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 56 degrees of freedom
# Null hypothesis probability = 3.168160e-01
Photon flux (15-150 keV) in 1.896 sec: 1.98056 ( -0.15903 0.15918 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28419e-07 ( -2.3116e-08 2.41588e-08 ) ergs/cm2
Band function
Time interval is from -0.072 sec. to 1.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.620861 ( -0.738251 2.21 )
beta : -2.69575 ( 2.71508 0.634605 )
Epeak [keV] : 44.6449 ( -13.0403 11.1015 )
Norm@50keV : 7.76737E-02 ( -0.0475959 2.49571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.56 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 55 degrees of freedom
# Null hypothesis probability = 3.134234e-01
Photon flux (15-150 keV) in 1.896 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31904e-07 ( -2.3189e-07 -2.34554e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.9497 (-0.848569 0.919316)
R^2/D10^2 : 0.706876 (-0.187359 0.252868)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.46 using 59 PHA bins.
# Reduced chi-squared = 1.412 for 57 degrees of freedom
# Null hypothesis probability = 2.205465e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.354e-08 4.038e-09
25- 50 9.429e-08 7.432e-09
50-150 6.363e-08 1.166e-08
15-150 1.915e-07 1.729e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.2794 (-16.1258 23.4753)
Norm : 9.80366 (-1.06294 1.20884)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.816e-08 5.176e-09
25- 50 7.886e-08 5.972e-09
50-150 1.097e-07 2.116e-08
15-150 2.367e-07 2.541e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.63771 (-2.82142 2.94475)
R1^2/D10^2 : 2.73677 (-1.6539 4.31761)
kT2 [keV] : 17.5750 (-4.78462 41.9386)
R2^2/D10^2 : 7.65907E-02 (-0.0738461 0.259312)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.369e-08 1.562e-08
25- 50 8.379e-08 2.645e-08
50-150 9.735e-08 4.833e-08
15-150 2.248e-07 8.775e-08
Peak spectrum fit
Power-law model
Time interval is from -0.074 sec. to 0.926 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75020 ( -0.127432 0.130776 )
Norm@50keV : 2.08608E-02 ( -0.00179783 0.00178032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.22 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.946791e-01
Photon flux (15-150 keV) in 1 sec: 2.82094 ( -0.221731 0.221823 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92497e-07 ( -1.70777e-08 1.71991e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.074 sec. to 0.926 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.770462 ( -0.679599 0.585032 )
Epeak [keV] : 57.2981 ( -9.04242 21.307 )
Norm@50keV : 7.14015E-02 ( -0.03666 0.0950058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.32 using 59 PHA bins.
# Reduced chi-squared = 0.8986 for 56 degrees of freedom
# Null hypothesis probability = 6.887447e-01
Photon flux (15-150 keV) in 1 sec: 2.74416 ( -0.22701 0.22673 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79909e-07 ( -1.8323e-08 1.869e-08 ) ergs/cm2
Band function
Time interval is from -0.074 sec. to 0.926 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.610572 ( -0.701501 2.27882 )
beta : -2.55038 ( 2.55054 0.640081 )
Epeak [keV] : 53.4700 ( -20.3697 23.0139 )
Norm@50keV : 8.98681E-02 ( -0.0494667 3.53107 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.06 using 59 PHA bins.
# Reduced chi-squared = 0.9102 for 55 degrees of freedom
# Null hypothesis probability = 6.634203e-01
Photon flux (15-150 keV) in 1 sec: 2.70897 ( 4.29103 -0.22505 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81302e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2020 (-1.03174 1.13015)
R^2/D10^2 : 0.670666 (-0.188144 0.258116)
(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 2.115e-08 2.800e-09
25- 50 6.785e-08 6.855e-09
50-150 6.142e-08 1.056e-08
15-150 1.504e-07 1.530e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 110.324 (-27.9005 40.4062)
Norm : 12.2947 (-1.1899 1.44611)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.211e-08 3.585e-09
25- 50 5.658e-08 5.300e-09
50-150 9.674e-08 3.243e-08
15-150 1.854e-07 3.695e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.76377 (-2.38298 2.57577)
R1^2/D10^2 : 3.27709 (-1.91214 5.08855)
kT2 [keV] : 19.2800 (-4.4777 12.7221)
R2^2/D10^2 : 8.67720E-02 (-0.0755577 0.191856)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.952e-08 1.106e-08
25- 50 6.035e-08 2.002e-08
50-150 8.828e-08 4.400e-08
15-150 1.781e-07 7.659e-08
Plot creation:
Wed Oct 15 04:51:13 EDT 2025