batgrbproduct analysis for trigger=1246907
batgrbproduct Analysis for Trigger=1246907
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 Aug 6 02:12:44 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1246907/GCN5_download_cron
======================================================================
Trigger: 01246907 Segment: 000
BAT Trigger Time: 744516176.576 [s; MET]
Trigger Stop: 744516177.6 [s; MET]
UTC: 2024-08-05T02:02:22.641800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 190.91086426608 Dec: -53.6216831669858 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.95
Image Trigger?: NO
Rate S/N Ratio: 73.4642770331268 [ if not an image trigger ]
Image S/N Ratio: 18.95
Flight Position: [ source = BAT ]
RA: 190.91086426608 Dec: -53.6216831669858 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 190.919019975579 Dec: -53.6028500272238 [deg; J2000]
{ 12h 43m 40.6s , -53d 36' 10.3" }
+/- 0.789643500492485 [arcmin] (estimated 90% radius based on SNR)
+/- 0.214235868724652 [arcmin] (formal 1-sigma fit error)
SNR: 42.6231389527861
Angular difference between Flight and Ground position is 1.166683 arcmin
Partial Coding Fraction: 0.3164062 [ including projection effects ]
Duration
T90: 37.3400000333786 +/- 6.21625135141523
Measured from: -1.47199988365173
to: 35.8680001497269 [s; relative to TRIGTIME]
T50: 7.13999998569489 +/- 0.591959519104136
Measured from: 1.18400013446808
to: 8.32400012016296 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.28400003910065
to: 4.28400003910065 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.93599998950958
to: 258.128000020981 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.813913 4.210807 4.239631 1.437577
0.127117 0.133803 0.121615 0.102287 [error]
Peak 0.149643 0.333494 0.419084 0.153160
0.016785 0.020597 0.022504 0.016808 [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 8.42e-07 1.84e-06 3.18e-06 1.27e-05 8.71e-06 1.86e-05 erg/cm2
Error 6.09e-08 7.74e-08 1.19e-07 1.13e-06 3.04e-07 1.18e-06 erg/cm2
Peak flux Power-law 1.46e+00 2.24e+00 2.57e+00 5.69e+00 7.95e+00 1.20e+01 ph/cm2/s
Error 1.94e-01 1.84e-01 1.63e-01 7.68e-01 5.01e-01 8.48e-01 ph/cm2/s
Fluence Cutoff-PL 8.42e-07 1.85e-06 3.18e-06 1.25e-05 8.71e-06 1.84e-05 erg/cm2
Error 6.84e-08 5.88e-08 1.27e-07 1.95e-06 2.30e-07 2.14e-06 erg/cm2
Peak flux Cutoff-PL 1.25e+00 2.28e+00 2.76e+00 3.60e+00 7.85e+00 9.89e+00 ph/cm2/s
Error 2.45e-01 1.99e-01 2.22e-01 1.32e+00 5.08e-01 1.39e+00 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 1.214 0.063 - - 3.30e-03 1.11e-04 59.950 57
CPL 1.209 0.174 9998.6 0.0 3.32e-03 4.52e-04 59.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.796 0.104 - - 6.92e-02 4.44e-03 54.850 57
CPL 0.269 0.446 201.3 277.5 1.15e-01 4.99e-02 50.230 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: 16.256000 sec.
T50 in the 50-300 keV band: 5.952000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 262.064 -3.936 258.128
T90 37.340 -1.472 35.868
T50 7.140 1.184 8.324
Peak 1.000 3.284 4.284
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
190.9190 -53.6029 0.0045 33.6 -88.3 10.5229 42.6 TRIG_01246907
------------------------------------------
Foreground time interval of the image:
-3.936 11.725 (delta_t = 15.661 [sec])
Background time interval of the image:
-239.576 -203.926 (delta_t = 35.650 [sec])
-202.576 -128.526 (delta_t = 74.050 [sec])
-127.576 -3.936 (delta_t = 123.640 [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
-3.936000 115.254000
116.424000 258.128000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21388 ( -0.0627965 0.0624163 )
Norm@50keV : 3.30169E-03 ( -0.000111076 0.000110851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.95 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.693342e-01
Photon flux (15-150 keV) in 260.9 sec: 0.388325 ( -0.0141186 0.0141799 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.70548e-06 ( -3.03346e-07 3.03904e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.936000 115.254000
116.424000 258.128000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20922 ( -0.187284 0.160601 )
Epeak [keV] : 9998.61 ( -9998.65 -9998.65 )
Norm@50keV : 3.31713E-03 ( -0.000109895 0.000793192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.343281e-01
Photon flux (15-150 keV) in 260.9 sec: 0.388226 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.70759e-06 ( -1.56905e-07 3.02409e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-3.936000 115.254000
116.424000 258.128000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.966869 ( 0.966869 0.966869 )
beta : -1.21388 ( -0.062403 0.0628261 )
Epeak [keV] : 44.8997 ( -44.8977 -44.8977 )
Norm@50keV : 6.18100E-03 ( -0.00271037 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.95 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.010481e-01
Photon flux (15-150 keV) in 260.9 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] : 21.0100 ( )
R^2/D10^2 : 1.47940E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 246.72 using 59 PHA bins.
# Reduced chi-squared = 4.3284 for 57 degrees of freedom
# Null hypothesis probability = 1.916627e-25
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.218e-07 2.192e-08
25- 50 1.655e-06 9.301e-08
50-150 5.444e-06 2.818e-07
15-150 7.421e-06 2.896e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.66004 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.078e-06 4.031e-08
25- 50 2.075e-06 8.284e-08
50-150 4.550e-06 1.670e-07
15-150 7.703e-06 2.909e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.32679 (-1.03514 1.16992)
R1^2/D10^2 : 0.283816 (-0.111707 0.208651)
kT2 [keV] : 31.9859 (-3.266 4.55047)
R2^2/D10^2 : 3.30605E-03 (-0.00116079 0.00143625)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.005e-07 1.178e-07
25- 50 1.837e-06 1.722e-07
50-150 6.092e-06 4.983e-07
15-150 8.729e-06 6.966e-07
Peak spectrum fit
Power-law model
Time interval is from 3.284 sec. to 4.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.796031 ( -0.10552 0.10319 )
Norm@50keV : 6.91593E-02 ( -0.00445084 0.00442589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.85 using 59 PHA bins.
# Reduced chi-squared = 0.9624 for 57 degrees of freedom
# Null hypothesis probability = 5.560112e-01
Photon flux (15-150 keV) in 1 sec: 7.94975 ( -0.501049 0.501597 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.09543e-07 ( -5.30016e-08 5.30883e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.284 sec. to 4.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.269294 ( -0.469127 0.422781 )
Epeak [keV] : 201.310 ( -66.3542 488.661 )
Norm@50keV : 0.115103 ( -0.0378853 0.0619702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.23 using 59 PHA bins.
# Reduced chi-squared = 0.8970 for 56 degrees of freedom
# Null hypothesis probability = 6.919286e-01
Photon flux (15-150 keV) in 1 sec: 7.84699 ( -0.5073 0.50783 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.00958e-07 ( -5.4818e-08 5.457e-08 ) ergs/cm2
Band function
Time interval is from 3.284 sec. to 4.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.884224 ( 0.884224 0.884224 )
beta : -0.796030 ( -0.103164 0.105579 )
Epeak [keV] : 14.0152 ( -14.0152 -14.0152 )
Norm@50keV : 0.102255 ( -0.0374871 1.04561e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.85 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 55 degrees of freedom
# Null hypothesis probability = 4.801734e-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] : 25.8492 (-2.08205 2.36407)
R^2/D10^2 : 0.187859 (-0.043234 0.0541104)
(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 2.142e-08 2.750e-09
25- 50 1.235e-07 1.260e-08
50-150 6.088e-07 5.690e-08
15-150 7.537e-07 5.560e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 30.5276 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.602e-08 5.835e-09
25- 50 1.462e-07 1.790e-08
50-150 3.207e-07 1.037e-07
15-150 5.430e-07 1.258e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.80626 (-2.87453 3.95513)
R1^2/D10^2 : 1.45243 (-0.811878 2.46655)
kT2 [keV] : 37.1995 (-6.74286 17.0608)
R2^2/D10^2 : 5.48466E-02 (-0.0373355 0.049826)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.856e-08 1.706e-08
25- 50 1.371e-07 4.837e-08
50-150 6.328e-07 2.338e-07
15-150 8.084e-07 2.920e-07
Plot creation:
Tue Aug 6 02:21:56 EDT 2024