batgrbproduct analysis for trigger=1299088
batgrbproduct Analysis for Trigger=1299088
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): Mon Mar 31 09:19:19 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1299088/batgroup_hand_proc
======================================================================
Trigger: 01299088 Segment: 000
BAT Trigger Time: 764753440 [s; MET]
Trigger Stop: 764753528 [s; MET]
UTC: 2025-03-27T07:30:04.682040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.197231340375 Dec: 61.5954132033376 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.75
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.75
Flight Position: [ source = BAT ]
RA: 248.197231340375 Dec: 61.5954132033376 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.210266476575 Dec: 61.6110574920648 [deg; J2000]
{ 16h 32m 50.5s , +61d 36' 39.8" }
+/- 2.24512996958931 [arcmin] (estimated 90% radius based on SNR)
+/- 1.21817189831926 [arcmin] (formal 1-sigma fit error)
SNR: 9.57954378680222
Angular difference between Flight and Ground position is 1.009666 arcmin
Partial Coding Fraction: 0.1035156 [ including projection effects ]
Duration
T90: 91.0080000162125 +/- 12.6049538740041
Measured from: 3.75199997425079
to: 94.7599999904633 [s; relative to TRIGTIME]
T50: 34.6240000724792 +/- 9.41458278576535
Measured from: 18.5360000133514
to: 53.1600000858307 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.4919999837875
to: 25.4919999837875 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.67200005054474
to: 109.927999973297 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.027111 3.525925 3.355896 1.375175
0.252841 0.232197 0.203890 0.169297 [error]
Peak 0.041381 0.106692 0.112077 0.055024
0.025567 0.026820 0.024378 0.017861 [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 8.08e-07 1.69e-06 2.77e-06 1.02e-05 7.64e-06 1.55e-05 erg/cm2
Error 1.19e-07 1.46e-07 1.97e-07 1.73e-06 5.10e-07 1.78e-06 erg/cm2
Peak flux Power-law 1.02e+00 6.87e-01 3.01e-01 1.83e-01 2.10e+00 2.19e+00 ph/cm2/s
Error 4.52e-01 2.38e-01 1.28e-01 1.26e-01 7.47e-01 7.60e-01 ph/cm2/s
Fluence Cutoff-PL 8.09e-07 1.69e-06 2.77e-06 1.01e-05 7.64e-06 1.54e-05 erg/cm2
Error 1.24e-07 1.46e-07 1.97e-07 2.16e-06 5.06e-07 2.57e-06 erg/cm2
Peak flux Cutoff-PL 4.02e-01 8.63e-01 6.36e-01 1.05e-01 1.99e+00 2.01e+00 ph/cm2/s
Error 4.77e-01 3.69e-01 2.78e-01 -------- 7.29e-01 7.36e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.07e-01 8.82e-01 5.95e-01 1.11e-01 2.08e+00 2.10e+00 ph/cm2/s
Error -------- 2.97e-01 2.49e-01 -------- 5.09e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.289 0.123 - - 7.12e-03 4.83e-04 60.190 57
CPL 1.284 0.247 10000.0 0.0 7.15e-03 4.76e-04 60.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.193 0.445 - - 1.27e-02 4.69e-03 64.000 57
CPL -1.187 3.016 61.7 15.7 3.41e-01 2.92e+00 55.600 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: 67.072000 sec.
T50 in the 50-300 keV band: 23.808000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 108.256 1.672 109.928
T90 91.008 3.752 94.760
T50 34.624 18.536 53.160
Peak 1.000 24.492 25.492
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.2103 +61.6111 0.0198 50.6 -143.8 11.3505 9.6 TRIG_01299088
------------------------------------------
Foreground time interval of the image:
1.672 109.928 (delta_t = 108.256 [sec])
Background time interval of the image:
-17.499 1.672 (delta_t = 19.171 [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 1.672 sec. to 109.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28852 ( -0.123997 0.122012 )
Norm@50keV : 7.12160E-03 ( -0.000483912 0.000481461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.19 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.611312e-01
Photon flux (15-150 keV) in 108.3 sec: 0.847854 ( -0.0645636 0.0651056 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64312e-06 ( -5.09286e-07 5.0997e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.672 sec. to 109.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28423 ( -0.325927 0.168438 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.15177E-03 ( -0.000484599 0.000467937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 56 degrees of freedom
# Null hypothesis probability = 3.261678e-01
Photon flux (15-150 keV) in 108.3 sec: 0.847682 ( -0.06469 0.064026 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64387e-06 ( -5.07548e-07 5.05414e-07 ) ergs/cm2
Band function
Time interval is from 1.672 sec. to 109.928 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02703 ( 1.02703 1.02703 )
beta : -1.28851 ( -0.121946 0.124153 )
Epeak [keV] : 42.1316 ( -42.1316 2154.56 )
Norm@50keV : 1.36394E-02 ( -0.00529187 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.19 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.935371e-01
Photon flux (15-150 keV) in 108.3 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] : 21.4322 ( )
R^2/D10^2 : 2.92658E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 119.73 using 59 PHA bins.
# Reduced chi-squared = 2.1005 for 57 degrees of freedom
# Null hypothesis probability = 2.354037e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.726e-07 3.845e-08
25- 50 1.419e-06 1.635e-07
50-150 4.865e-06 4.684e-07
15-150 6.557e-06 5.188e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.9863 -200)
Norm : 3.67405 (-0.244343 0.244343)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.913e-07 8.095e-08
25- 50 1.907e-06 1.809e-07
50-150 4.182e-06 9.606e-07
15-150 7.080e-06 1.286e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.44443 (-1.73993 2.0134)
R1^2/D10^2 : 0.433524 (-0.211729 0.505598)
kT2 [keV] : 37.4084 (-7.54961 15.1193)
R2^2/D10^2 : 3.96016E-03 (-0.00241392 0.00413799)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.096e-07 3.169e-07
25- 50 1.748e-06 5.667e-07
50-150 5.140e-06 2.408e-06
15-150 7.597e-06 2.628e-06
Peak spectrum fit
Power-law model
Time interval is from 24.492 sec. to 25.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19259 ( -0.392449 0.496851 )
Norm@50keV : 1.27440E-02 ( -0.00473318 0.00464407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.00 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.444276e-01
Photon flux (15-150 keV) in 1 sec: 2.09948 ( -0.743465 0.7503 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19756e-07 ( -4.1887e-08 4.20317e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.492 sec. to 25.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.18709 ( -3.91655 2.1156 )
Epeak [keV] : 61.6880 ( -17.0542 14.2579 )
Norm@50keV : 0.341297 ( -0.351461 5.48563 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 0.9928 for 56 degrees of freedom
# Null hypothesis probability = 4.899876e-01
Photon flux (15-150 keV) in 1 sec: 1.99263 ( -0.71528 0.74205 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50245e-07 ( -4.55e-08 4.587e-08 ) ergs/cm2
Band function
Time interval is from 24.492 sec. to 25.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.19990 ( -3.15109 -2.24843 )
beta : -10.0000 ( 10 1.77636e-14 )
Epeak [keV] : 61.9790 ( -17.5701 13.5336 )
Norm@50keV : 0.340657 ( -0.340691 5.12279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.519593e-01
Photon flux (15-150 keV) in 1 sec: 2.07968 ( 4.92032 -0.38901 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50725e-07 ( -1.50718e-07 -4.5102e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2656 (-3.49195 3.39984)
R^2/D10^2 : 0.210310 (-0.11612 0.287585)
(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 1.146e-08 6.958e-09
25- 50 4.891e-08 2.468e-08
50-150 9.100e-08 5.680e-08
15-150 1.514e-07 7.688e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 68.4351 (-29.5668 53.2085)
Norm : 11.4710 (-4.29465 5.24011)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.936e-08 1.140e-08
25- 50 4.642e-08 2.028e-08
50-150 5.862e-08 4.369e-08
15-150 1.344e-07 6.286e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.79154 (-4.6902 24.936)
R1^2/D10^2 : 5.33486 (-5.46892 51.2842)
kT2 [keV] : 17.1989 (-3.77189 4.52057)
R2^2/D10^2 : 0.156117 (-0.156938 0.26762)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.028e-08 1.147e-08
25- 50 4.827e-08 2.817e-08
50-150 8.895e-08 5.715e-08
15-150 1.575e-07 9.015e-08
Plot creation:
Mon Mar 31 10:03:03 EDT 2025