batgrbproduct analysis for trigger=1444088
batgrbproduct Analysis for Trigger=1444088
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 Jan 28 18:28:24 EST 2026
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1444088/GCN5_download_cron
======================================================================
Trigger: 01444088 Segment: 000
BAT Trigger Time: 791229072 [s; MET]
Trigger Stop: 791229176 [s; MET]
UTC: 2026-01-27T17:50:34.881960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.856557841886 Dec: 6.75849016040837 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.04
Flight Position: [ source = BAT ]
RA: 231.856557841886 Dec: 6.75849016040837 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 231.878701429189 Dec: 6.75789152032363 [deg; J2000]
{ 15h 27m 30.9s , +06d 45' 28.4" }
+/- 1.65622908563637 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00234887952277 [arcmin] (formal 1-sigma fit error)
SNR: 14.7941230587705
Angular difference between Flight and Ground position is 1.319872 arcmin
Partial Coding Fraction: 0.40625 [ including projection effects ]
Duration
T90: 104.06400001049 +/- 19.4133431121852
Measured from: 2.84000015258789
to: 106.904000163078 [s; relative to TRIGTIME]
T50: 17.5040000677109 +/- 9.35005277133839
Measured from: 27.8160001039505
to: 45.3200001716614 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 33.3559999465942
to: 34.3559999465942 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.67999994754791
to: 117.047999978065 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.244270 1.346916 0.986382 0.256194
0.105193 0.109732 0.091519 0.072746 [error]
Peak 0.065289 0.089550 0.078271 0.021728
0.010900 0.012458 0.010790 0.008272 [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 4.14e-07 6.49e-07 7.67e-07 1.76e-06 2.34e-06 3.59e-06 erg/cm2
Error 5.58e-08 5.49e-08 9.20e-08 4.38e-07 2.17e-07 5.19e-07 erg/cm2
Peak flux Power-law 6.60e-01 6.98e-01 5.23e-01 6.35e-01 2.12e+00 2.52e+00 ph/cm2/s
Error 1.64e-01 1.08e-01 8.69e-02 2.17e-01 3.05e-01 3.52e-01 ph/cm2/s
Fluence Cutoff-PL 4.08e-07 6.57e-07 7.72e-07 1.49e-06 2.33e-06 3.33e-06 erg/cm2
Error 6.20e-08 6.50e-08 9.57e-08 7.90e-07 2.32e-07 8.20e-07 erg/cm2
Peak flux Cutoff-PL 6.53e-01 7.02e-01 5.27e-01 5.97e-01 2.12e+00 2.47e+00 ph/cm2/s
Error 1.82e-01 1.18e-01 9.68e-02 -------- 3.08e-01 4.43e-01 ph/cm2/s
Fluence Band -------- -------- -------- 1.54e-06 -------- 3.46e-06 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 1.760 0.149 - - 2.17e-03 1.95e-04 61.600 57
CPL 1.661 0.412 165.3 0.0 2.45e-03 0.00e+00 61.500 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.416 0.236 - - 1.74e-02 2.41e-03 56.100 57
CPL 1.413 1.343 9972.2 0.0 1.74e-02 0.00e+00 56.090 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: 33.216000 sec.
T50 in the 50-300 keV band: 6.592000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 119.728 -2.680 117.048
T90 104.064 2.840 106.904
T50 17.504 27.816 45.320
Peak 1.000 33.356 34.356
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
231.8787 +6.7579 0.0130 38.9 -141.2 3.3995 14.8 TRIG_01444088
------------------------------------------
Foreground time interval of the image:
-2.680 7.620 (delta_t = 10.300 [sec])
9.000 84.430 (delta_t = 75.430 [sec])
86.000 111.501 (delta_t = 25.501 [sec])
Background time interval of the image:
-239.000 -237.140 (delta_t = 1.860 [sec])
-236.000 -86.080 (delta_t = 149.920 [sec])
-85.000 -48.010 (delta_t = 36.990 [sec])
-47.000 -36.190 (delta_t = 10.810 [sec])
-35.000 -2.680 (delta_t = 32.320 [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
Multiple GTIs in the spectrum
tstart tstop
-2.680000 7.620000
9.000000 84.430000
86.000000 117.048000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75980 ( -0.147564 0.1507 )
Norm@50keV : 2.17403E-03 ( -0.000196029 0.000193836 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.60 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.148033e-01
Photon flux (15-150 keV) in 116.8 sec: 0.295036 ( -0.0252755 0.025328 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3418e-06 ( -2.16665e-07 2.18122e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-2.680000 7.620000
9.000000 84.430000
86.000000 117.048000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66112 ( -0.578007 0.245248 )
Epeak [keV] : 165.331 ( )
Norm@50keV : 2.45012E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.855143e-01
Photon flux (15-150 keV) in 116.8 sec: 0.293804 ( -0.026062 0.025976 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32634e-06 ( -2.34791e-07 2.2943e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-2.680000 7.620000
9.000000 84.430000
86.000000 117.048000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.70258 ( -4.70258 -4.70258 )
beta : -1.80532 ( -0.169419 0.159497 )
Epeak [keV] : 21.4124 ( -21.4124 4.36389 )
Norm@50keV : 443.325 ( -36.7525 1.76379e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.84 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 2.739290e-01
Photon flux (15-150 keV) in 116.8 sec: 0.298669 ( ) 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] : 12.8060 (-1.38863 1.57163)
R^2/D10^2 : 5.49740E-02 (-0.0191312 0.0291747)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.12 using 59 PHA bins.
# Reduced chi-squared = 1.8617 for 57 degrees of freedom
# Null hypothesis probability = 8.525201e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.233e-07 3.936e-08
25- 50 7.567e-07 8.053e-08
50-150 7.776e-07 1.430e-07
15-150 1.758e-06 1.945e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 125.768 (-37.79 59.4252)
Norm : 1.22500 (-0.12789 0.168286)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.719e-07 4.333e-08
25- 50 6.706e-07 7.464e-08
50-150 1.224e-06 4.473e-07
15-150 2.267e-06 5.198e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.83106 (-1.33263 1.65639)
R1^2/D10^2 : 0.701399 (-0.416421 1.26272)
kT2 [keV] : 23.0356 (-4.70838 8.64816)
R2^2/D10^2 : 5.04112E-03 (-0.00346542 0.00713569)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.114e-07 1.476e-07
25- 50 6.395e-07 1.708e-07
50-150 1.245e-06 5.128e-07
15-150 2.296e-06 7.072e-07
Peak spectrum fit
Power-law model
Time interval is from 33.356 sec. to 34.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41625 ( -0.235706 0.236241 )
Norm@50keV : 1.73718E-02 ( -0.00241442 0.00240974 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.10 using 59 PHA bins.
# Reduced chi-squared = 0.9841 for 57 degrees of freedom
# Null hypothesis probability = 5.090158e-01
Photon flux (15-150 keV) in 1 sec: 2.12350 ( -0.304291 0.305101 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6731e-07 ( -2.51918e-08 2.53329e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.356 sec. to 34.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41309 ( -0.887713 1.79865 )
Epeak [keV] : 9972.24 ( -9966.26 -9966.26 )
Norm@50keV : 1.74343E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.713203e-01
Photon flux (15-150 keV) in 1 sec: 2.11969 ( -0.30838 0.30752 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67014e-07 ( -2.6068e-08 2.5594e-08 ) ergs/cm2
Band function
Time interval is from 33.356 sec. to 34.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98393 ( -4.98393 -4.98393 )
beta : -1.43034 ( -0.251536 0.241782 )
Epeak [keV] : 19.1928 ( -19.1928 52.704 )
Norm@50keV : 8528.47 ( -1176.36 8.77273e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.02 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.362577e-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] : 16.8322 (-2.94807 3.72901)
R^2/D10^2 : 0.165087 (-0.0826836 0.157935)
(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 9.551e-09 2.812e-09
25- 50 4.192e-08 9.115e-09
50-150 8.454e-08 2.247e-08
15-150 1.360e-07 2.560e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-63.9958 -200)
Norm : 8.81468 (-1.22218 1.22218)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.195e-08 1.249e-08
25- 50 4.223e-08 2.332e-08
50-150 9.261e-08 5.180e-08
15-150 1.568e-07 8.880e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.09979 (-3.16501 4.15255)
R1^2/D10^2 : 2.04401 (-1.654 4.45861)
kT2 [keV] : 29.2890 (-9.30951 50.7162)
R2^2/D10^2 : 2.02896E-02 (-0.019091 0.0636887)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.956e-08 1.078e-08
25- 50 4.051e-08 2.183e-08
50-150 1.073e-07 5.916e-08
15-150 1.674e-07 8.825e-08
Plot creation:
Wed Jan 28 18:31:56 EST 2026