batgrbproduct analysis for trigger=1402466
batgrbproduct Analysis for Trigger=1402466
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 8 19:03:23 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1402466/GCN5_download_cron
======================================================================
Trigger: 01402466 Segment: 000
BAT Trigger Time: 781558654.528 [s; MET]
Trigger Stop: 781558655.04 [s; MET]
UTC: 2025-10-07T19:36:58.064460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 128.173448684227 Dec: 21.8233077799029 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.46
Image Trigger?: NO
Rate S/N Ratio: 19.2353840616713 [ if not an image trigger ]
Image S/N Ratio: 10.46
Flight Position: [ source = BAT ]
RA: 128.173448684227 Dec: 21.8233077799029 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 128.161643373405 Dec: 21.8101627820001 [deg; J2000]
{ 08h 32m 38.8s , +21d 48' 36.6" }
+/- 1.47222013867823 [arcmin] (estimated 90% radius based on SNR)
+/- 0.653728074244611 [arcmin] (formal 1-sigma fit error)
SNR: 17.5048060229109
Angular difference between Flight and Ground position is 1.026873 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 64.1879999637604 +/- 5.17297942461361
Measured from: 11.5200001001358
to: 75.7080000638962 [s; relative to TRIGTIME]
T50: 10.8799998760223 +/- 0.25999989509583
Measured from: 55.5880001783371
to: 66.4680000543594 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 56.1399999856949
to: 57.1399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0360000133514404
to: 103.432000041008 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.889949 5.892615 4.917828 1.400767
0.064325 0.069396 0.061203 0.046999 [error]
Peak 0.240761 0.415126 0.445360 0.134583
0.009474 0.012119 0.012338 0.008928 [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 1.15e-06 2.35e-06 3.76e-06 1.34e-05 1.04e-05 2.07e-05 erg/cm2
Error 4.48e-08 5.29e-08 7.01e-08 6.10e-07 1.79e-07 6.27e-07 erg/cm2
Peak flux Power-law 2.15e+00 2.88e+00 2.82e+00 4.97e+00 9.48e+00 1.28e+01 ph/cm2/s
Error 1.41e-01 1.13e-01 9.89e-02 3.83e-01 3.06e-01 4.52e-01 ph/cm2/s
Fluence Cutoff-PL 1.13e-06 2.35e-06 3.79e-06 1.25e-05 1.04e-05 1.98e-05 erg/cm2
Error 5.40e-08 5.28e-08 8.40e-08 1.43e-06 1.86e-07 1.45e-06 erg/cm2
Peak flux Cutoff-PL 2.03e+00 2.91e+00 2.90e+00 3.95e+00 9.38e+00 1.18e+01 ph/cm2/s
Error 1.83e-01 1.19e-01 1.24e-01 8.17e-01 3.19e-01 9.10e-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 1.322 0.033 - - 1.03e-02 1.78e-04 41.430 57
CPL 1.317 0.033 9893.1 0.0 1.03e-02 9.00e-04 41.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.027 0.057 - - 8.22e-02 2.60e-03 50.440 57
CPL 0.800 0.213 307.5 1680.8 1.03e-01 2.19e-02 47.280 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: 58.496000 sec.
T50 in the 50-300 keV band: 10.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 103.468 -0.036 103.432
T90 64.188 11.520 75.708
T50 10.880 55.588 66.468
Peak 1.000 56.140 57.140
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
128.1616 +21.8102 0.0110 13.7 106.5 0.7158 17.5 TRIG_01402466
------------------------------------------
Foreground time interval of the image:
-0.036 9.873 (delta_t = 9.909 [sec])
Background time interval of the image:
-108.227 -0.036 (delta_t = 108.191 [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 -0.036 sec. to 103.432 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32151 ( -0.0331435 0.0330468 )
Norm@50keV : 1.02534E-02 ( -0.000178301 0.000177987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.43 using 59 PHA bins.
# Reduced chi-squared = 0.7269 for 57 degrees of freedom
# Null hypothesis probability = 9.397494e-01
Photon flux (15-150 keV) in 103.5 sec: 1.22825 ( -0.0244775 0.0246039 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04329e-05 ( -1.78964e-07 1.79046e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 103.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31671 ( -0.0328662 0.0339792 )
Epeak [keV] : 9893.11 ( -9833.33 -9833.33 )
Norm@50keV : 1.03042E-02 ( -0.000176277 0.00162344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.41 using 59 PHA bins.
# Reduced chi-squared = 0.7394 for 56 degrees of freedom
# Null hypothesis probability = 9.273845e-01
Photon flux (15-150 keV) in 103.5 sec: 1.22120 ( -0.01811 0.03085 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04061e-05 ( -1.80473e-07 1.92407e-07 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 103.432 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.267837 ( 0.675741 5.6495 )
beta : -1.33787 ( -0.0460601 0.0400869 )
Epeak [keV] : 48.0901 ( -48.0629 144.028 )
Norm@50keV : 5.25199E-02 ( -0.0527047 312.616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.26 using 59 PHA bins.
# Reduced chi-squared = 0.7138 for 55 degrees of freedom
# Null hypothesis probability = 9.461741e-01
Photon flux (15-150 keV) in 103.5 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] : 20.4895 ( )
R^2/D10^2 : 4.83134E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 733.53 using 59 PHA bins.
# Reduced chi-squared = 12.869 for 57 degrees of freedom
# Null hypothesis probability = 3.253013e-118
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.007e-07 1.527e-08
25- 50 2.028e-06 5.537e-08
50-150 6.331e-06 1.527e-07
15-150 8.759e-06 1.615e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.29253 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.364e-06 2.743e-08
25- 50 2.624e-06 5.175e-08
50-150 5.755e-06 1.087e-07
15-150 9.742e-06 2.023e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.35222 (-0.549517 0.578876)
R1^2/D10^2 : 0.626137 (-0.125399 0.16504)
kT2 [keV] : 34.0721 (-2.19314 2.66304)
R2^2/D10^2 : 7.51990E-03 (-0.00164328 0.00188072)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.728e-07 6.924e-08
25- 50 2.431e-06 8.642e-08
50-150 6.991e-06 2.277e-07
15-150 1.039e-05 2.976e-07
Peak spectrum fit
Power-law model
Time interval is from 56.140 sec. to 57.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02715 ( -0.0567447 0.0565168 )
Norm@50keV : 8.21952E-02 ( -0.00260071 0.00259855 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.44 using 59 PHA bins.
# Reduced chi-squared = 0.8849 for 57 degrees of freedom
# Null hypothesis probability = 7.179342e-01
Photon flux (15-150 keV) in 1 sec: 9.47810 ( -0.305845 0.305992 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.80412e-07 ( -3.08169e-08 3.09535e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.140 sec. to 57.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.800247 ( -0.229711 0.195545 )
Epeak [keV] : 307.473 ( -124.823 3236.83 )
Norm@50keV : 0.103444 ( -0.0177181 0.0261766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.28 using 59 PHA bins.
# Reduced chi-squared = 0.8443 for 56 degrees of freedom
# Null hypothesis probability = 7.901423e-01
Photon flux (15-150 keV) in 1 sec: 9.38206 ( -0.31853 0.31863 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.71734e-07 ( -3.2478e-08 3.2343e-08 ) ergs/cm2
Band function
Time interval is from 56.140 sec. to 57.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.800240 ( -0.151614 0.14731 )
beta : -9.35683 ( 9.36583 19.3658 )
Epeak [keV] : 307.440 ( -63.6619 3227.58 )
Norm@50keV : 0.103439 ( -0.0222212 0.0254908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.28 using 59 PHA bins.
# Reduced chi-squared = 0.8597 for 55 degrees of freedom
# Null hypothesis probability = 7.608328e-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] : 21.8726 ( )
R^2/D10^2 : 0.343188 ( )
(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 3.047e-08 1.880e-09
25- 50 1.605e-07 7.450e-09
50-150 5.738e-07 3.275e-08
15-150 7.648e-07 3.040e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 38.4478 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.574e-08 3.390e-09
25- 50 1.842e-07 6.300e-09
50-150 4.039e-07 1.385e-08
15-150 6.838e-07 2.170e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.00735 (-1.18024 1.39392)
R1^2/D10^2 : 4.20097 (-1.58935 2.82604)
kT2 [keV] : 33.3150 (-3.47099 5.09724)
R2^2/D10^2 : 8.00140E-02 (-0.0293156 0.0347405)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.174e-08 8.130e-09
25- 50 1.689e-07 1.445e-08
50-150 6.462e-07 6.015e-08
15-150 8.769e-07 6.390e-08
Plot creation:
Wed Oct 8 19:08:16 EDT 2025