batgrbproduct analysis for trigger=1319125
batgrbproduct Analysis for Trigger=1319125
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): Sat May 31 19:51:33 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1319125/GCN5_download_cron
======================================================================
Trigger: 01319125 Segment: 000
BAT Trigger Time: 770324358.592 [s; MET]
Trigger Stop: 770324360.64 [s; MET]
UTC: 2025-05-30T18:58:42.893720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 55.143001589254 Dec: -22.4591568533006 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.76
Image Trigger?: NO
Rate S/N Ratio: 13.4536240470737 [ if not an image trigger ]
Image S/N Ratio: 6.76
Flight Position: [ source = BAT ]
RA: 55.143001589254 Dec: -22.4591568533006 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 55.1463543145825 Dec: -22.4572466001431 [deg; J2000]
{ 03h 40m 35.1s , -22d 27' 26.1" }
+/- 1.84370371335247 [arcmin] (estimated 90% radius based on SNR)
+/- 0.952716855277586 [arcmin] (formal 1-sigma fit error)
SNR: 12.6928638697415
Angular difference between Flight and Ground position is 0.218399 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 42.8639998435974 +/- 6.03968809620895
Measured from: -26.243999838829
to: 16.6200000047684 [s; relative to TRIGTIME]
T50: 26.7680000066757 +/- 3.98217231093247
Measured from: -20.7079999446869
to: 6.06000006198883 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.279999971389771
to: 0.720000028610229 [s; relative to TRIGTIME]
Total Fluence
Measured from: -29.7719999551773
to: 21.2639999389648 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.347245 0.432156 0.404309 0.113016
0.042268 0.044236 0.037533 0.031631 [error]
Peak 0.023299 0.036413 0.034651 0.009469
0.006376 0.006791 0.005766 0.004769 [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 9.30e-08 1.91e-07 3.06e-07 1.09e-06 8.48e-07 1.68e-06 erg/cm2
Error 1.69e-08 2.06e-08 3.67e-08 2.94e-07 9.12e-08 3.17e-07 erg/cm2
Peak flux Power-law 2.15e-01 2.59e-01 2.26e-01 3.38e-01 8.18e-01 1.04e+00 ph/cm2/s
Error 7.69e-02 5.61e-02 4.66e-02 1.53e-01 1.53e-01 1.97e-01 ph/cm2/s
Fluence Cutoff-PL 9.21e-08 1.92e-07 3.07e-07 1.01e-06 8.45e-07 1.60e-06 erg/cm2
Error 1.46e-08 2.25e-08 3.92e-08 4.27e-07 9.51e-08 4.96e-07 erg/cm2
Peak flux Cutoff-PL 2.14e-01 2.59e-01 2.26e-01 3.37e-01 8.18e-01 1.04e+00 ph/cm2/s
Error 6.12e-02 5.76e-02 4.90e-02 2.86e-01 1.52e-01 2.37e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 9.42e-02 -------- 6.42e-02 3.97e-02 2.80e-01 2.97e-01 ph/cm2/s
Error -------- -------- -------- 9.35e-02 -------- 1.71e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.320 0.173 - - 1.69e-03 1.64e-04 52.220 57
CPL 1.316 0.436 9993.5 0.0 1.70e-03 1.24e-03 52.220 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.196 0.327 - - 6.98e-03 1.25e-03 35.460 57
CPL 1.191 1.883 10000.0 0.0 7.01e-03 -2.88e-03 35.470 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: 35.840000 sec.
T50 in the 50-300 keV band: 27.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 51.036 -29.772 21.264
T90 42.864 -26.244 16.620
T50 26.768 -20.708 6.060
Peak 1.000 -0.280 0.720
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
55.1464 -22.4572 0.0151 23.9 -156.5 1.2878 12.7 TRIG_01319125
------------------------------------------
Foreground time interval of the image:
-29.772 21.264 (delta_t = 51.036 [sec])
Background time interval of the image:
-106.191 -29.772 (delta_t = 76.419 [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 -29.772 sec. to 21.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32002 ( -0.173854 0.172065 )
Norm@50keV : 1.68919E-03 ( -0.000163627 0.000163453 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.22 using 59 PHA bins.
# Reduced chi-squared = 0.9161 for 57 degrees of freedom
# Null hypothesis probability = 6.547425e-01
Photon flux (15-150 keV) in 51.04 sec: 0.202288 ( -0.0202301 0.0202831 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.47887e-07 ( -9.08461e-08 9.14984e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -29.772 sec. to 21.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31639 ( -0.609389 0.262632 )
Epeak [keV] : 9993.52 ( -9991.86 -9991.86 )
Norm@50keV : 1.69613E-03 ( -0.000571207 0.00190849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.22 using 59 PHA bins.
# Reduced chi-squared = 0.9324 for 56 degrees of freedom
# Null hypothesis probability = 6.188664e-01
Photon flux (15-150 keV) in 51.04 sec: 0.201967 ( -0.020906 0.020512 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45365e-07 ( -9.63023e-08 9.38319e-08 ) ergs/cm2
Band function
Time interval is from -29.772 sec. to 21.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.85654 ( -4.85654 -4.85654 )
beta : -1.34908 ( -0.187607 0.183126 )
Epeak [keV] : 21.5862 ( -21.5862 7.41357 )
Norm@50keV : 287.093 ( -27.7005 615313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9425 for 55 degrees of freedom
# Null hypothesis probability = 5.962961e-01
Photon flux (15-150 keV) in 51.04 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] : 18.0077 (-2.26017 2.69399)
R^2/D10^2 : 1.25708E-02 (-0.0047107 0.0072791)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.58 using 59 PHA bins.
# Reduced chi-squared = 1.379 for 57 degrees of freedom
# Null hypothesis probability = 3.062736e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.165e-08 8.394e-09
25- 50 1.927e-07 2.993e-08
50-150 4.536e-07 8.172e-08
15-150 6.880e-07 8.702e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-34.0173 -200)
Norm : 0.839650 (-0.081876 0.081876)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.067e-07 1.559e-08
25- 50 2.053e-07 1.119e-07
50-150 4.503e-07 2.451e-07
15-150 7.624e-07 3.842e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.76457 (-1.58874 2.39259)
R1^2/D10^2 : 0.372822 (-0.262534 0.995989)
kT2 [keV] : 26.2969 (-5.12498 10.1102)
R2^2/D10^2 : 3.11347E-03 (-0.00204651 0.00199079)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.772e-08 4.958e-08
25- 50 1.803e-07 5.849e-08
50-150 5.547e-07 1.866e-07
15-150 8.327e-07 2.778e-07
Peak spectrum fit
Power-law model
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19554 ( -0.334313 0.319403 )
Norm@50keV : 6.97560E-03 ( -0.00125288 0.00125106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.46 using 59 PHA bins.
# Reduced chi-squared = 0.6221 for 57 degrees of freedom
# Null hypothesis probability = 9.887941e-01
Photon flux (15-150 keV) in 1 sec: 0.818283 ( -0.152338 0.152976 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.08589e-08 ( -1.39391e-08 1.40946e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19126 ( -1.0405 2.72496 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.00923E-03 ( -0.00125636 -0.00700941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.47 using 59 PHA bins.
# Reduced chi-squared = 0.6333 for 56 degrees of freedom
# Null hypothesis probability = 9.854101e-01
Photon flux (15-150 keV) in 1 sec: 0.817934 ( -0.152013 0.152084 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.07301e-08 ( -1.40696e-08 1.41441e-08 ) ergs/cm2
Band function
Time interval is from -0.280 sec. to 0.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96789 ( -4.96789 -4.96789 )
beta : -1.25709 ( -0.374848 0.362179 )
Epeak [keV] : 24.6650 ( -24.665 11.7557 )
Norm@50keV : 588.923 ( -105.338 2.59469e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.12 using 59 PHA bins.
# Reduced chi-squared = 0.6385 for 55 degrees of freedom
# Null hypothesis probability = 9.831438e-01
Photon flux (15-150 keV) in 1 sec: 0.279678 ( ) 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] : 20.2202 (-5.11372 7.54588)
R^2/D10^2 : 3.52797E-02 (-0.0221574 0.0571956)
(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 2.769e-09 1.148e-09
25- 50 1.389e-08 6.401e-09
50-150 4.216e-08 1.518e-08
15-150 5.882e-08 1.974e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-64.5715 -200)
Norm : 3.39833 (-0.623266 0.623266)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.462e-09 5.010e-09
25- 50 1.628e-08 9.265e-09
50-150 3.570e-08 2.039e-08
15-150 6.044e-08 3.407e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.97648 (-2.7926 4.73966)
R1^2/D10^2 : 0.806278 (-0.655361 4.64895)
kT2 [keV] : 35.2001 (-12.8371 100.659)
R2^2/D10^2 : 5.37217E-03 (-0.00488785 0.0173181)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.221e-09 4.191e-09
25- 50 1.470e-08 7.945e-09
50-150 5.111e-08 2.982e-08
15-150 7.303e-08 3.840e-08
Plot creation:
Sat May 31 19:55:34 EDT 2025