batgrbproduct analysis for trigger=1291459
batgrbproduct Analysis for Trigger=1291459
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): Tue Mar 11 11:04:07 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1291459/batgroup_hand_proc
======================================================================
Trigger: 01291459 Segment: 000
BAT Trigger Time: 762205188.968 [s; MET]
Trigger Stop: 762205189.032 [s; MET]
UTC: 2025-02-25T19:39:13.824460 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 306.144929241132 Dec: -41.4845040533715 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.46
Image Trigger?: NO
Rate S/N Ratio: 25.7681974534503 [ if not an image trigger ]
Image S/N Ratio: 8.46
Flight Position: [ source = BAT ]
RA: 306.144929241132 Dec: -41.4845040533715 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.134221754669 Dec: -41.4807851787943 [deg; J2000]
{ 20h 24m 32.2s , -41d 28' 50.8" }
+/- 0.892613973431084 [arcmin] (estimated 90% radius based on SNR)
+/- 0.272347807231428 [arcmin] (formal 1-sigma fit error)
SNR: 35.7765810538356
Angular difference between Flight and Ground position is 0.530502 arcmin
Partial Coding Fraction: 0.4765625 [ including projection effects ]
Duration
T90: 110.459999918938 +/- 2.12469300143381
Measured from: 0.468000054359436
to: 110.927999973297 [s; relative to TRIGTIME]
T50: 66.9039999246597 +/- 2.80881473145127
Measured from: 2.52400004863739
to: 69.4279999732971 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.31199991703033
to: 2.31199991703033 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0240000486373901
to: 122.459999918938 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.998434 3.928152 2.667691 0.822155
0.120679 0.115908 0.097323 0.077638 [error]
Peak 0.234485 0.424569 0.452160 0.201316
0.015998 0.019322 0.019918 0.016166 [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 9.83e-07 1.70e-06 2.24e-06 6.00e-06 6.54e-06 1.09e-05 erg/cm2
Error 6.82e-08 6.78e-08 1.01e-07 6.14e-07 2.44e-07 6.71e-07 erg/cm2
Peak flux Power-law 2.28e+00 3.13e+00 3.13e+00 5.72e+00 1.04e+01 1.42e+01 ph/cm2/s
Error 2.31e-01 1.47e-01 1.62e-01 6.62e-01 5.00e-01 7.53e-01 ph/cm2/s
Fluence Cutoff-PL 9.86e-07 1.70e-06 2.25e-06 5.55e-06 6.55e-06 1.05e-05 erg/cm2
Error 5.41e-08 7.14e-08 9.57e-08 9.92e-07 2.50e-07 9.94e-07 erg/cm2
Peak flux Cutoff-PL 2.28e+00 3.12e+00 3.13e+00 5.67e+00 1.04e+01 1.42e+01 ph/cm2/s
Error 2.31e-01 1.85e-01 1.62e-01 6.73e-01 4.98e-01 8.64e-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 1.602 0.068 - - 5.76e-03 2.04e-04 68.650 57
CPL 1.603 0.095 9999.4 0.0 5.77e-03 8.06e-04 68.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.991 0.086 - - 9.01e-02 4.28e-03 54.130 57
CPL 0.986 0.175 9999.0 0.0 9.07e-02 9.85e-03 54.210 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: 108.608000 sec.
T50 in the 50-300 keV band: 64.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 122.484 -0.024 122.460
T90 110.460 0.468 110.928
T50 66.904 2.524 69.428
Peak 1.000 1.312 2.312
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.1342 -41.4808 0.0054 33.4 -51.5 7.9833 35.8 TRIG_01291459
------------------------------------------
Foreground time interval of the image:
-0.024 38.002 (delta_t = 38.026 [sec])
39.032 70.633 (delta_t = 31.601 [sec])
Background time interval of the image:
-239.968 -47.709 (delta_t = 192.259 [sec])
-46.968 -0.024 (delta_t = 46.944 [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
-0.024000 38.002000
39.032000 122.460000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60221 ( -0.0675138 0.0675091 )
Norm@50keV : 5.75901E-03 ( -0.000204521 0.000204382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.65 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 57 degrees of freedom
# Null hypothesis probability = 1.387363e-01
Photon flux (15-150 keV) in 121.5 sec: 0.740565 ( -0.0290584 0.0292178 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54211e-06 ( -2.43299e-07 2.43936e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.024000 38.002000
39.032000 122.460000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60289 ( -0.124762 0.0662105 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.76621E-03 ( -0.00020279 0.00140967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.67 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 56 degrees of freedom
# Null hypothesis probability = 1.192124e-01
Photon flux (15-150 keV) in 121.5 sec: 0.740870 ( -0.028084 0.028509 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54513e-06 ( -2.62282e-07 2.38456e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.024000 38.002000
39.032000 122.460000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28730 ( 1.24196 1.24196 )
beta : -1.65212 ( -0.125824 0.110941 )
Epeak [keV] : 90.3796 ( -84.4009 -84.4009 )
Norm@50keV : 8.67946E-03 ( -0.00309293 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.01 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 55 degrees of freedom
# Null hypothesis probability = 1.118547e-01
Photon flux (15-150 keV) in 121.5 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] : 15.1099 ( )
R^2/D10^2 : 7.62575E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 281.00 using 59 PHA bins.
# Reduced chi-squared = 4.9297 for 57 degrees of freedom
# Null hypothesis probability = 2.391345e-31
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.423e-07 3.171e-08
25- 50 1.769e-06 7.958e-08
50-150 2.758e-06 1.798e-07
15-150 4.970e-06 2.114e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.501 (-36.6309 -198.516)
Norm : 2.96373 (-0.105555 0.124966)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.972e-07 4.732e-08
25- 50 1.725e-06 8.748e-08
50-150 3.778e-06 7.071e-07
15-150 6.400e-06 7.351e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.40846 (-0.825623 0.845423)
R1^2/D10^2 : 0.461570 (-0.125611 0.192833)
kT2 [keV] : 36.1956 (-5.85862 9.28016)
R2^2/D10^2 : 2.83686E-03 (-0.00140457 0.00225098)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.047e-07 9.811e-08
25- 50 1.827e-06 1.361e-07
50-150 3.907e-06 6.136e-07
15-150 6.539e-06 7.831e-07
Peak spectrum fit
Power-law model
Time interval is from 1.312 sec. to 2.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.991426 ( -0.0869391 0.0859766 )
Norm@50keV : 9.01313E-02 ( -0.00428122 0.00426993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9497 for 57 degrees of freedom
# Null hypothesis probability = 5.833821e-01
Photon flux (15-150 keV) in 1 sec: 10.3709 ( -0.499053 0.501861 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.77822e-07 ( -5.1022e-08 5.0738e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.312 sec. to 2.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.985713 ( -0.149009 0.201435 )
Epeak [keV] : 9998.96 ( -9998.98 -9998.98 )
Norm@50keV : 9.06733E-02 ( -0.0042421 0.015463 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9681 for 56 degrees of freedom
# Null hypothesis probability = 5.428062e-01
Photon flux (15-150 keV) in 1 sec: 10.3691 ( -0.49468 0.5004 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.76436e-07 ( -4.9035e-08 5.0934e-08 ) ergs/cm2
Band function
Time interval is from 1.312 sec. to 2.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.841381 ( 0.841406 0.841406 )
beta : -0.991423 ( -0.0859665 0.0869734 )
Epeak [keV] : 47.9115 ( -47.8726 9952.12 )
Norm@50keV : 0.143224 ( -0.0508471 3.36513e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9842 for 55 degrees of freedom
# Null hypothesis probability = 5.077994e-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] : 22.2268 ( )
R^2/D10^2 : 0.352750 ( )
(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 3.210e-08 3.040e-09
25- 50 1.708e-07 1.415e-08
50-150 6.304e-07 4.855e-08
15-150 8.333e-07 5.045e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 41.9667 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.045e-07 5.655e-09
25- 50 2.010e-07 1.140e-08
50-150 4.409e-07 7.230e-08
15-150 7.464e-07 8.855e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.90007 (-1.4258 1.57538)
R1^2/D10^2 : 2.93298 (-1.01263 1.73156)
kT2 [keV] : 54.9882 (-12.9695 30.8538)
R2^2/D10^2 : 2.22320E-02 (-0.0139423 0.0228885)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.515e-08 1.211e-08
25- 50 1.932e-07 2.745e-08
50-150 7.429e-07 2.917e-07
15-150 1.001e-06 2.988e-07
Plot creation:
Tue Mar 11 11:10:52 EDT 2025