batgrbproduct analysis for trigger=1125809
batgrbproduct Analysis for Trigger=1125809
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 Oct 1 12:39:17 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1125809/GCN5_download_cron
======================================================================
Trigger: 01125809 Segment: 000
BAT Trigger Time: 686229142.08 [s; MET]
Trigger Stop: 686229143.104 [s; MET]
UTC: 2022-09-30T11:11:52.128760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 64.7373600672291 Dec: 13.3517442973112 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: NO
Rate S/N Ratio: 41.206795556073 [ if not an image trigger ]
Image S/N Ratio: 7.33
Flight Position: [ source = BAT ]
RA: 64.7373600672291 Dec: 13.3517442973112 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 64.7250007159349 Dec: 13.3533458198373 [deg; J2000]
{ 04h 18m 54.0s , +13d 21' 12.0" }
+/- 1.73947607908381 [arcmin] (estimated 90% radius based on SNR)
+/- 0.843340120040256 [arcmin] (formal 1-sigma fit error)
SNR: 13.7931492638428
Angular difference between Flight and Ground position is 0.727885 arcmin
Partial Coding Fraction: 0.1103516 [ including projection effects ]
Duration
T90: 180.468000054359 +/- 104.199033059084
Measured from: 0.0440000295639038
to: 180.512000083923 [s; relative to TRIGTIME]
T50: 59.7960000038147 +/- 24.055809856683
Measured from: 2.50400006771088
to: 62.3000000715256 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.308000087738037
to: 0.691999912261963 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.416000008583069
to: 235.671999931335 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.799870 2.996650 2.340474 0.591349
0.191779 0.202696 0.181498 0.150276 [error]
Peak 0.123460 0.271465 0.286180 0.130155
0.032219 0.037803 0.038452 0.030845 [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 8.10e-07 1.41e-06 1.87e-06 5.07e-06 5.46e-06 9.16e-06 erg/cm2
Error 1.06e-07 1.14e-07 1.78e-07 1.02e-06 4.39e-07 1.16e-06 erg/cm2
Peak flux Power-law 1.51e+00 1.92e+00 1.78e+00 2.88e+00 6.19e+00 8.09e+00 ph/cm2/s
Error 4.77e-01 3.75e-01 2.86e-01 9.79e-01 1.01e+00 1.26e+00 ph/cm2/s
Fluence Cutoff-PL 7.32e-07 1.49e-06 1.96e-06 2.45e-06 5.29e-06 6.63e-06 erg/cm2
Error 1.27e-07 1.40e-07 2.04e-07 1.76e-06 4.72e-07 1.78e-06 erg/cm2
Peak flux Cutoff-PL 1.33e+00 1.96e+00 1.89e+00 1.91e+00 6.08e+00 7.10e+00 ph/cm2/s
Error 6.02e-01 4.08e-01 3.87e-01 -------- 1.03e+00 1.76e+00 ph/cm2/s
Fluence Band 6.73e-07 1.56e-06 1.86e-06 3.98e-06 5.30e-06 8.09e-06 erg/cm2
Error -------- -------- -------- -------- 4.55e-07 -------- 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 1.591 0.127 - - 2.47e-03 1.88e-04 58.230 57
CPL 1.026 0.566 88.8 195.3 4.70e-03 3.31e-03 54.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.112 0.260 - - 5.33e-02 8.27e-03 68.160 57
CPL 0.638 0.981 169.7 0.0 8.59e-02 0.00e+00 67.640 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: 73.472000 sec.
T50 in the 50-300 keV band: 17.344000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 236.088 -0.416 235.672
T90 180.468 0.044 180.512
T50 59.796 2.504 62.300
Peak 1.000 -0.308 0.692
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
64.7250 +13.3533 0.0140 50.6 15.9 4.0457 13.8 TRIG_01125809
------------------------------------------
Foreground time interval of the image:
-0.416 14.421 (delta_t = 14.837 [sec])
Background time interval of the image:
-68.679 -0.416 (delta_t = 68.263 [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 -0.416 sec. to 235.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59133 ( -0.126985 0.127986 )
Norm@50keV : 2.46796E-03 ( -0.000188404 0.000188043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.23 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.300119e-01
Photon flux (15-150 keV) in 236.1 sec: 0.316299 ( -0.0251706 0.0252429 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.45518e-06 ( -4.37973e-07 4.39422e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.416 sec. to 235.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02618 ( -0.604255 0.528163 )
Epeak [keV] : 88.7660 ( -23.0694 367.477 )
Norm@50keV : 4.69754E-03 ( -0.00208758 0.00452275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.88 using 59 PHA bins.
# Reduced chi-squared = 0.9800 for 56 degrees of freedom
# Null hypothesis probability = 5.173649e-01
Photon flux (15-150 keV) in 236.1 sec: 0.308669 ( -0.026131 0.026186 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.29483e-06 ( -4.73428e-07 4.69886e-07 ) ergs/cm2
Band function
Time interval is from -0.416 sec. to 235.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.374879 ( -0.831899 4.21579 )
beta : -1.83560 ( 1.89529 0.305363 )
Epeak [keV] : 44.6653 ( -14.9818 112.399 )
Norm@50keV : 3.66281E-02 ( -0.0335218 5.76599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.42 using 59 PHA bins.
# Reduced chi-squared = 0.9713 for 55 degrees of freedom
# Null hypothesis probability = 5.351221e-01
Photon flux (15-150 keV) in 236.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30158e-06 ( -5.29993e-06 -4.54634e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6863 (-1.27749 1.42091)
R^2/D10^2 : 3.85025E-02 (-0.0110144 0.0151094)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.78 using 59 PHA bins.
# Reduced chi-squared = 1.505 for 57 degrees of freedom
# Null hypothesis probability = 8.164291e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.118e-07 5.808e-08
25- 50 1.604e-06 1.699e-07
50-150 2.333e-06 3.349e-07
15-150 4.349e-06 3.730e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 180.635 (-53.8165 -181.371)
Norm : 1.29796 (-0.105815 0.118197)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.725e-07 9.314e-08
25- 50 1.468e-06 4.211e-07
50-150 3.113e-06 1.449e-06
15-150 5.354e-06 1.684e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.03289 (-2.1644 2.05985)
R1^2/D10^2 : 0.153004 (-0.0716402 0.193519)
kT2 [keV] : 31.6700 (-9.5995 33.1466)
R2^2/D10^2 : 1.66871E-03 (-0.001471 0.00506035)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.347e-07 1.954e-07
25- 50 1.606e-06 5.337e-07
50-150 3.082e-06 1.327e-06
15-150 5.322e-06 1.764e-06
Peak spectrum fit
Power-law model
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11246 ( -0.264477 0.255249 )
Norm@50keV : 5.32649E-02 ( -0.00829854 0.00823865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.16 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 57 degrees of freedom
# Null hypothesis probability = 1.478461e-01
Photon flux (15-150 keV) in 1 sec: 6.18608 ( -1.00303 1.00919 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54706e-07 ( -8.79708e-08 8.82164e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.637737 ( -1.35986 0.602706 )
Epeak [keV] : 169.708 ( -169.716 -169.716 )
Norm@50keV : 8.58515E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.64 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 56 degrees of freedom
# Null hypothesis probability = 1.370862e-01
Photon flux (15-150 keV) in 1 sec: 6.08346 ( -1.02878 1.03706 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48577e-07 ( -9.1959e-08 9.0389e-08 ) ergs/cm2
Band function
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -4.99999 -4.99999 )
beta : -1.46743 ( -0.549881 0.394651 )
Epeak [keV] : 44.9175 ( -44.9175 9.55243 )
Norm@50keV : 137.126 ( -20.7369 1.51163e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.70 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 55 degrees of freedom
# Null hypothesis probability = 1.168216e-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] : 20.9917 (-3.64301 4.82844)
R^2/D10^2 : 0.256273 (-0.12683 0.22565)
(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 2.134e-08 6.800e-09
25- 50 1.097e-07 2.747e-08
50-150 3.601e-07 1.046e-07
15-150 4.911e-07 1.197e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-41.2529 -200)
Norm : 26.2274 (-4.12444 4.12444)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.531e-08 3.799e-08
25- 50 1.256e-07 7.115e-08
50-150 2.755e-07 1.553e-07
15-150 4.665e-07 2.654e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.8538 (-6.6201 6.77614)
R1^2/D10^2 : 0.867854 (-0.567397 5.74728)
kT2 [keV] : 56.4570 (-55.8881 -57.2645)
R2^2/D10^2 : 8.70525E-03 (-0.00804191 0.15205)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.106e-08 1.518e-08
25- 50 1.009e-07 3.263e-08
50-150 3.717e-07 1.033e-07
15-150 5.137e-07 1.214e-07
Plot creation:
Sat Oct 1 12:43:03 EDT 2022