batgrbproduct analysis for trigger=1512686
batgrbproduct Analysis for Trigger=1512686
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 Sep 23 09:10:22 EDT 2026
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1512686/batgroup_hand_proc
======================================================================
Trigger: 01512686 Segment: 000
BAT Trigger Time: 811764077.952 [s; MET]
Trigger Stop: 811764078.976 [s; MET]
UTC: 2026-09-22T10:00:39.449420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.903695378982 Dec: 14.2071450684077 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.03
Image Trigger?: NO
Rate S/N Ratio: 39.1535439009038 [ if not an image trigger ]
Image S/N Ratio: 12.03
Flight Position: [ source = BAT ]
RA: 227.903695378982 Dec: 14.2071450684077 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 227.908792014689 Dec: 14.2160637757052 [deg; J2000]
{ 15h 11m 38.1s , +14d 12' 57.8" }
+/- 1.15357230610987 [arcmin] (estimated 90% radius based on SNR)
+/- 0.550806280847134 [arcmin] (formal 1-sigma fit error)
SNR: 24.8017840006048
Angular difference between Flight and Ground position is 0.611745 arcmin
Partial Coding Fraction: 0.21875 [ including projection effects ]
Duration
T90: 63.9639999866486 +/- 12.789221260845
Measured from: -2.44800007343292
to: 61.5159999132156 [s; relative to TRIGTIME]
T50: 23.1959999799728 +/- 11.2628943161355
Measured from: 0.235999941825867
to: 23.4319999217987 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.723999977111816
to: 1.72399997711182 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.89999997615814
to: 80.2439999580383 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.400774 2.537212 2.123589 0.595199
0.123452 0.115117 0.097848 0.074860 [error]
Peak 0.088129 0.206927 0.314879 0.113069
0.020990 0.022357 0.023877 0.016340 [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 5.79e-07 1.12e-06 1.68e-06 5.42e-06 4.72e-06 8.79e-06 erg/cm2
Error 5.75e-08 6.64e-08 9.56e-08 6.94e-07 2.42e-07 7.41e-07 erg/cm2
Peak flux Power-law 1.10e+00 1.63e+00 1.79e+00 3.71e+00 5.65e+00 8.23e+00 ph/cm2/s
Error 2.34e-01 2.19e-01 1.71e-01 7.09e-01 5.83e-01 8.23e-01 ph/cm2/s
Fluence Cutoff-PL 5.24e-07 1.15e-06 1.75e-06 3.33e-06 4.63e-06 6.75e-06 erg/cm2
Error 7.19e-08 7.30e-08 1.14e-07 1.39e-06 2.56e-07 1.38e-06 erg/cm2
Peak flux Cutoff-PL 7.37e-01 1.62e+00 2.08e+00 1.86e+00 5.46e+00 6.30e+00 ph/cm2/s
Error 2.88e-01 2.50e-01 2.53e-01 -------- 5.86e-01 1.01e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.59e-01 1.62e+00 2.07e+00 1.95e+00 5.49e+00 6.41e+00 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 1.418 0.088 - - 5.75e-03 2.87e-04 40.430 57
CPL 1.011 0.360 137.3 209.3 8.77e-03 3.31e-03 36.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.861 0.157 - - 4.92e-02 5.11e-03 61.960 57
CPL -0.269 0.812 132.6 74.4 1.33e-01 1.02e-01 54.520 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: 55.872000 sec.
T50 in the 50-300 keV band: 3.904000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 85.144 -4.900 80.244
T90 63.964 -2.448 61.516
T50 23.196 0.236 23.432
Peak 1.000 0.724 1.724
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
227.9088 +14.2161 0.0078 44.2 -45.3 4.8893 24.8 TRIG_01512686
------------------------------------------
Foreground time interval of the image:
-4.900 11.349 (delta_t = 16.249 [sec])
Background time interval of the image:
-60.952 -4.900 (delta_t = 56.052 [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 -4.900 sec. to 80.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41764 ( -0.0879044 0.0873752 )
Norm@50keV : 5.75285E-03 ( -0.000286608 0.000286507 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.43 using 59 PHA bins.
# Reduced chi-squared = 0.7093 for 57 degrees of freedom
# Null hypothesis probability = 9.525972e-01
Photon flux (15-150 keV) in 85.14 sec: 0.703446 ( -0.0389121 0.0390932 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71601e-06 ( -2.41885e-07 2.42165e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.900 sec. to 80.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01148 ( -0.37426 0.345876 )
Epeak [keV] : 137.292 ( -40.5221 378.169 )
Norm@50keV : 8.77490E-03 ( -0.00259477 0.00402413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.36 using 59 PHA bins.
# Reduced chi-squared = 0.6493 for 56 degrees of freedom
# Null hypothesis probability = 9.806357e-01
Photon flux (15-150 keV) in 85.14 sec: 0.686638 ( -0.041104 0.041338 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.62999e-06 ( -2.56408e-07 2.55105e-07 ) ergs/cm2
Band function
Time interval is from -4.900 sec. to 80.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.735115 ( -1.01567 0.230976 )
beta : -1.55333 ( 1.55927 0.147739 )
Epeak [keV] : 44.2178 ( -26.1709 131.803 )
Norm@50keV : 0.119229 ( -0.117028 55.4206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.86 using 59 PHA bins.
# Reduced chi-squared = 0.6338 for 55 degrees of freedom
# Null hypothesis probability = 9.844881e-01
Photon flux (15-150 keV) in 85.14 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] : 17.9835 (-1.1335 1.23229)
R^2/D10^2 : 4.29517E-02 (-0.00895001 0.0111358)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.77 using 59 PHA bins.
# Reduced chi-squared = 1.9609 for 57 degrees of freedom
# Null hypothesis probability = 2.008204e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.369e-07 2.354e-08
25- 50 1.095e-06 7.918e-08
50-150 2.569e-06 2.069e-07
15-150 3.901e-06 2.260e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-14.3124 -200)
Norm : 2.96180 (-0.14743 0.14743)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.281e-07 3.435e-08
25- 50 1.208e-06 7.194e-08
50-150 2.650e-06 1.664e-07
15-150 4.486e-06 2.656e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.53077 (-1.33569 1.49405)
R1^2/D10^2 : 0.347371 (-0.13697 0.256677)
kT2 [keV] : 30.7618 (-4.76472 7.8693)
R2^2/D10^2 : 5.31253E-03 (-0.00287961 0.00451316)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.725e-07 9.953e-08
25- 50 1.204e-06 2.077e-07
50-150 2.974e-06 8.195e-07
15-150 4.651e-06 8.918e-07
Peak spectrum fit
Power-law model
Time interval is from 0.724 sec. to 1.724 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.861114 ( -0.159559 0.154083 )
Norm@50keV : 4.92447E-02 ( -0.00514281 0.00508125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.96 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.037440e-01
Photon flux (15-150 keV) in 1 sec: 5.65224 ( -0.581465 0.584707 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61205e-07 ( -5.40966e-08 5.4132e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.724 sec. to 1.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.268575 ( -0.88793 0.735485 )
Epeak [keV] : 132.617 ( -31.1806 117.619 )
Norm@50keV : 0.133085 ( -0.0621973 0.142418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9735 for 56 degrees of freedom
# Null hypothesis probability = 5.311555e-01
Photon flux (15-150 keV) in 1 sec: 5.46356 ( -0.58253 0.58982 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61122e-07 ( -5.6024e-08 5.5675e-08 ) ergs/cm2
Band function
Time interval is from 0.724 sec. to 1.724 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.268727 ( -0.689276 0.735612 )
beta : -10.0000 ( 10 3.90799e-14 )
Epeak [keV] : 132.597 ( -20.5301 117.619 )
Norm@50keV : 0.133114 ( -0.0622026 0.142608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 55 degrees of freedom
# Null hypothesis probability = 4.930184e-01
Photon flux (15-150 keV) in 1 sec: 5.48559 ( ) 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] : 26.1819 (-2.84467 3.3925)
R^2/D10^2 : 0.130106 (-0.0409421 0.056338)
(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 1.511e-08 3.120e-09
25- 50 8.771e-08 1.316e-08
50-150 4.423e-07 5.985e-08
15-150 5.451e-07 6.555e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 ( )
Norm : 23.5882 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.874e-08 2.664e-08
25- 50 1.130e-07 3.457e-08
50-150 2.478e-07 1.360e-07
15-150 4.195e-07 2.222e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.0615 (-11.0616 11.655)
R1^2/D10^2 : 0.399809 (-0.314775 459.915)
kT2 [keV] : 35.2610 (-33.3299 -35.261)
R2^2/D10^2 : 4.16741E-02 (-0.0411397 0.0924798)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.202e-08 1.276e-08
25- 50 9.764e-08 5.380e-08
50-150 4.422e-07 2.273e-07
15-150 5.618e-07 2.837e-07
Plot creation:
Wed Sep 23 09:24:56 EDT 2026