batgrbproduct analysis for trigger=1238732
batgrbproduct Analysis for Trigger=1238732
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 Jun 25 09:59:18 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1238732/GCN5_download_cron
======================================================================
Trigger: 01238732 Segment: 000
BAT Trigger Time: 740901703.68 [s; MET]
Trigger Stop: 740901704.192 [s; MET]
UTC: 2024-06-24T06:01:09.993340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 102.444139065186 Dec: -6.54353811645944 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.71
Image Trigger?: NO
Rate S/N Ratio: 13.4536240470737 [ if not an image trigger ]
Image S/N Ratio: 7.71
Flight Position: [ source = BAT ]
RA: 102.444139065186 Dec: -6.54353811645944 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 102.473494840561 Dec: -6.53410413323097 [deg; J2000]
{ 06h 49m 53.6s , -06d 32' 02.8" }
+/- 1.77076028648307 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04421807462373 [arcmin] (formal 1-sigma fit error)
SNR: 13.4463502047382
Angular difference between Flight and Ground position is 1.839160 arcmin
Partial Coding Fraction: 0.4960938 [ including projection effects ]
Duration
T90: 5.8879998922348 +/- 2.25458112832716
Measured from: 0.128000140190125
to: 6.01600003242493 [s; relative to TRIGTIME]
T50: 1.47199988365173 +/- 0.689301097615425
Measured from: 0.896000146865845
to: 2.36800003051758 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.876000046730042
to: 1.87600004673004 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0639998912811279
to: 7.04000008106232 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.127691 0.304927 0.227509 0.025850
0.025718 0.027564 0.024257 0.019538 [error]
Peak 0.031627 0.124679 0.109678 0.009505
0.010668 0.012364 0.010788 0.007145 [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 5.35e-08 1.09e-07 1.75e-07 6.21e-07 4.84e-07 9.58e-07 erg/cm2
Error 1.01e-08 1.30e-08 2.28e-08 1.71e-07 5.75e-08 1.88e-07 erg/cm2
Peak flux Power-law 5.96e-01 7.07e-01 6.06e-01 8.82e-01 2.22e+00 2.79e+00 ph/cm2/s
Error 1.26e-01 9.86e-02 8.00e-02 2.22e-01 2.79e-01 3.46e-01 ph/cm2/s
Fluence Cutoff-PL 4.29e-08 1.24e-07 1.90e-07 1.48e-07 4.47e-07 5.04e-07 erg/cm2
Error 1.21e-08 1.69e-08 2.72e-08 1.44e-07 6.27e-08 1.52e-07 erg/cm2
Peak flux Cutoff-PL 3.58e-01 8.52e-01 7.63e-01 1.77e-01 2.12e+00 2.15e+00 ph/cm2/s
Error 1.42e-01 1.33e-01 1.10e-01 1.19e-01 2.82e-01 2.99e-01 ph/cm2/s
Fluence Band 4.27e-08 1.76e-07 2.32e-07 5.31e-07 6.06e-07 9.73e-07 erg/cm2
Error 1.50e-08 2.37e-08 3.06e-08 -------- -------- -------- erg/cm2
Peak flux Band 4.29e-01 9.40e-01 5.46e-01 2.33e-01 2.04e+00 2.15e+00 ph/cm2/s
Error -------- -------- -------- -------- 2.82e-01 3.92e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.326 0.175 - - 6.94e-03 7.55e-04 52.690 57
CPL 0.071 0.936 78.3 36.0 2.91e-02 3.98e-02 45.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.224 0.176 - - 1.89e-02 2.29e-03 63.770 57
CPL -1.218 1.214 69.7 12.5 2.78e-01 5.79e-01 43.760 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: 1.792000 sec.
T50 in the 50-300 keV band: 1.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.104 -0.064 7.040
T90 5.888 0.128 6.016
T50 1.472 0.896 2.368
Peak 1.000 0.876 1.876
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
102.4735 -6.5341 0.0143 30.9 -63.1 0.6883 13.4 TRIG_01238732
------------------------------------------
Foreground time interval of the image:
-0.064 7.040 (delta_t = 7.104 [sec])
Background time interval of the image:
-229.679 -210.210 (delta_t = 19.469 [sec])
-208.680 -136.390 (delta_t = 72.290 [sec])
-135.680 -0.064 (delta_t = 135.616 [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 -0.064 sec. to 7.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32568 ( -0.175862 0.174298 )
Norm@50keV : 6.94378E-03 ( -0.000755087 0.000754758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9243 for 57 degrees of freedom
# Null hypothesis probability = 6.374695e-01
Photon flux (15-150 keV) in 7.104 sec: 0.832456 ( -0.0928206 0.0930265 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84472e-07 ( -5.72707e-08 5.76885e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 7.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.13664E-02 ( -1.03398 0.838521 )
Epeak [keV] : 78.2916 ( -16.0175 56.0725 )
Norm@50keV : 2.90803E-02 ( -0.0176581 0.0620038 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8151 for 56 degrees of freedom
# Null hypothesis probability = 8.370221e-01
Photon flux (15-150 keV) in 7.104 sec: 0.796287 ( -0.096443 0.096415 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47321e-07 ( -6.21046e-08 6.32341e-08 ) ergs/cm2
Band function
Time interval is from -0.064 sec. to 7.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.237442 ( -1.05595 4.73079 )
beta : -2.22238 ( 2.25876 0.821785 )
Epeak [keV] : 69.3794 ( -36.2855 52.9278 )
Norm@50keV : 4.34057E-02 ( -0.0231089 38.1057 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.23 using 59 PHA bins.
# Reduced chi-squared = 0.8223 for 55 degrees of freedom
# Null hypothesis probability = 8.235797e-01
Photon flux (15-150 keV) in 7.104 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.06118e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.3856 (-1.87398 2.18848)
R^2/D10^2 : 7.56241E-02 (-0.026837 0.0398241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.17 using 59 PHA bins.
# Reduced chi-squared = 0.8978 for 57 degrees of freedom
# Null hypothesis probability = 6.923304e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.966e-08 6.280e-09
25- 50 1.273e-07 2.032e-08
50-150 2.411e-07 4.738e-08
15-150 3.981e-07 6.053e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-41.4764 -200)
Norm : 3.47915 (-0.378646 0.378646)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.157e-08 3.401e-08
25- 50 1.184e-07 6.465e-08
50-150 2.597e-07 1.413e-07
15-150 4.397e-07 2.299e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.83742 (-5.65833 -9.84368)
R1^2/D10^2 : 0.229472 (-0.141832 2.25221)
kT2 [keV] : 25.6454 (-21.5079 -25.6852)
R2^2/D10^2 : 1.09376E-02 (-0.0108306 0.0521536)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.070e-08 2.322e-08
25- 50 1.279e-07 6.830e-08
50-150 2.830e-07 1.508e-07
15-150 4.516e-07 2.312e-07
Peak spectrum fit
Power-law model
Time interval is from 0.876 sec. to 1.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22437 ( -0.177581 0.174485 )
Norm@50keV : 1.88659E-02 ( -0.00229001 0.00228911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.77 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.505696e-01
Photon flux (15-150 keV) in 1 sec: 2.22238 ( -0.278819 0.27936 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90124e-07 ( -2.42836e-08 2.43832e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.876 sec. to 1.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.21799 ( -1.36678 1.06105 )
Epeak [keV] : 69.7241 ( -9.18641 15.7552 )
Norm@50keV : 0.278142 ( -0.278143 0.880543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.76 using 59 PHA bins.
# Reduced chi-squared = 0.7814 for 56 degrees of freedom
# Null hypothesis probability = 8.828798e-01
Photon flux (15-150 keV) in 1 sec: 2.12205 ( -0.28123 0.28319 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74744e-07 ( -2.4744e-08 2.541e-08 ) ergs/cm2
Band function
Time interval is from 0.876 sec. to 1.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.26813 ( -1.08217 -1.26816 )
beta : -3.66325 ( 3.47235 2.5793 )
Epeak [keV] : 69.0527 ( -17.7216 12.4854 )
Norm@50keV : 0.295918 ( -0.183582 21.4555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.59 using 59 PHA bins.
# Reduced chi-squared = 0.7926 for 55 degrees of freedom
# Null hypothesis probability = 8.662384e-01
Photon flux (15-150 keV) in 1 sec: 2.04249 ( 4.95751 -0.28149 ) 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] : 17.5364 (-1.87092 2.1792)
R^2/D10^2 : 0.177652 (-0.060165 0.0854377)
(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 1.103e-08 2.547e-09
25- 50 5.000e-08 8.545e-09
50-150 1.108e-07 2.210e-08
15-150 1.718e-07 2.435e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-33.4629 -200)
Norm : 9.39696 (-1.15363 1.15363)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.339e-08 1.312e-08
25- 50 4.500e-08 2.502e-08
50-150 9.870e-08 5.425e-08
15-150 1.671e-07 9.205e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 6.49658E-05 (-6.49653e-05 -6.49653e-05)
kT2 [keV] : 16.5527 (-2.4197 2.90239)
R2^2/D10^2 : 0.205454 (-0.0822816 0.0466452)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Tue Jun 25 10:03:04 EDT 2024