batgrbproduct analysis for trigger=1200812
batgrbproduct Analysis for Trigger=1200812
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): Wed Dec 6 12:15:10 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1200812/GCN5_download_cron
======================================================================
Trigger: 01200812 Segment: 000
BAT Trigger Time: 723487472 [s; MET]
Trigger Stop: 723487536 [s; MET]
UTC: 2023-12-05T16:43:59.506460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 54.1545616599091 Dec: 27.146354688855 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.23
Flight Position: [ source = BAT ]
RA: 54.1545616599091 Dec: 27.146354688855 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 54.1510779376399 Dec: 27.1501959700439 [deg; J2000]
{ 03h 36m 36.3s , +27d 09' 00.7" }
+/- 0.888989690540826 [arcmin] (estimated 90% radius based on SNR)
+/- 0.394370116353623 [arcmin] (formal 1-sigma fit error)
SNR: 35.9851286099799
Angular difference between Flight and Ground position is 0.296165 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 46.9439998865128 +/- 7.83825283202062
Measured from: -27.2359998226166
to: 19.7080000638962 [s; relative to TRIGTIME]
T50: 9.3639999628067 +/- 3.6813585273276
Measured from: -9.18799984455109
to: 0.176000118255615 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -5.03999996185303
to: -4.03999996185303 [s; relative to TRIGTIME]
Total Fluence
Measured from: -29.6640000343323
to: 54.1560000181198 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.766700 3.958948 3.365382 0.983948
0.089979 0.095721 0.083694 0.066081 [error]
Peak 0.165283 0.305774 0.316223 0.103387
0.013425 0.015860 0.015908 0.011896 [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 8.78e-07 1.73e-06 2.65e-06 8.87e-06 7.42e-06 1.41e-05 erg/cm2
Error 5.18e-08 5.90e-08 8.70e-08 6.83e-07 2.17e-07 7.20e-07 erg/cm2
Peak flux Power-law 1.75e+00 2.21e+00 2.04e+00 3.30e+00 7.13e+00 9.30e+00 ph/cm2/s
Error 1.84e-01 1.44e-01 1.26e-01 4.26e-01 4.00e-01 5.50e-01 ph/cm2/s
Fluence Cutoff-PL 8.78e-07 1.73e-06 2.65e-06 8.80e-06 7.43e-06 1.41e-05 erg/cm2
Error 5.18e-08 5.68e-08 9.29e-08 1.34e-06 2.15e-07 1.19e-06 erg/cm2
Peak flux Cutoff-PL 1.56e+00 2.29e+00 2.17e+00 2.03e+00 7.01e+00 8.05e+00 ph/cm2/s
Error 2.27e-01 1.61e-01 1.57e-01 7.21e-01 4.09e-01 8.17e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.55e+00 2.29e+00 2.17e+00 2.07e+00 7.01e+00 8.11e+00 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 1.385 0.053 - - 9.14e-03 2.56e-04 44.410 57
CPL 1.348 0.127 993.3 0.0 9.50e-03 1.13e-03 44.510 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.117 0.092 - - 6.13e-02 3.36e-03 65.900 57
CPL 0.616 0.385 154.2 144.2 1.05e-01 4.33e-02 60.300 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: 42.368000 sec.
T50 in the 50-300 keV band: 9.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 83.820 -29.664 54.156
T90 46.944 -27.236 19.708
T50 9.364 -9.188 0.176
Peak 1.000 -5.040 -4.040
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
54.1511 +27.1502 0.0053 32.0 37.0 9.1705 36.0 TRIG_01200812
------------------------------------------
Foreground time interval of the image:
-16.899 54.156 (delta_t = 71.055 [sec])
Background time interval of the image:
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 -29.664 sec. to 54.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38486 ( -0.0531167 0.0529627 )
Norm@50keV : 9.13839E-03 ( -0.00025608 0.000255981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.7792 for 57 degrees of freedom
# Null hypothesis probability = 8.878215e-01
Photon flux (15-150 keV) in 83.82 sec: 1.10912 ( -0.0346464 0.0348081 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42468e-06 ( -2.16919e-07 2.17261e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -29.664 sec. to 54.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34751 ( -0.202494 0.0512468 )
Epeak [keV] : 993.333 ( -9997.87 -9997.87 )
Norm@50keV : 9.49658E-03 ( -0.000255846 0.00199835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.51 using 59 PHA bins.
# Reduced chi-squared = 0.7949 for 56 degrees of freedom
# Null hypothesis probability = 8.655667e-01
Photon flux (15-150 keV) in 83.82 sec: 1.10879 ( -0.03483 0.03416 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42586e-06 ( -2.13607e-07 2.1644e-07 ) ergs/cm2
Band function
Time interval is from -29.664 sec. to 54.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95284 ( -4.95284 -4.95284 )
beta : -1.39522 ( -0.054568 0.0543656 )
Epeak [keV] : 21.3790 ( -21.379 3.62784 )
Norm@50keV : 2052.54 ( -57.2721 2.55951e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.44 using 59 PHA bins.
# Reduced chi-squared = 0.7898 for 55 degrees of freedom
# Null hypothesis probability = 8.698866e-01
Photon flux (15-150 keV) in 83.82 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] : 18.6364 ( )
R^2/D10^2 : 5.90440E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 344.38 using 59 PHA bins.
# Reduced chi-squared = 6.0417 for 57 degrees of freedom
# Null hypothesis probability = 1.060682e-42
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.402e-07 1.894e-08
25- 50 1.614e-06 6.999e-08
50-150 4.103e-06 1.865e-07
15-150 6.057e-06 1.836e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-4.81915 -200)
Norm : 4.66186 (-0.130982 0.130982)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.733e-07 3.185e-08
25- 50 1.872e-06 6.035e-08
50-150 4.106e-06 1.308e-07
15-150 6.952e-06 2.309e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.67442 (-0.763069 0.824833)
R1^2/D10^2 : 0.796792 (-0.23285 0.357348)
kT2 [keV] : 31.9552 (-3.05456 4.04271)
R2^2/D10^2 : 8.06436E-03 (-0.00261235 0.00329608)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.922e-07 8.617e-08
25- 50 1.776e-06 1.186e-07
50-150 4.863e-06 3.621e-07
15-150 7.432e-06 4.832e-07
Peak spectrum fit
Power-law model
Time interval is from -5.040 sec. to -4.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11670 ( -0.0921968 0.0916047 )
Norm@50keV : 6.13341E-02 ( -0.00336022 0.0033597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.90 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.961824e-01
Photon flux (15-150 keV) in 1 sec: 7.12632 ( -0.39944 0.399729 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.37888e-07 ( -3.85779e-08 3.86933e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.040 sec. to -4.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.615508 ( -0.402879 0.367437 )
Epeak [keV] : 154.158 ( -45.2499 243.206 )
Norm@50keV : 0.104520 ( -0.0331186 0.0534871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.30 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 56 degrees of freedom
# Null hypothesis probability = 3.231014e-01
Photon flux (15-150 keV) in 1 sec: 7.00818 ( -0.40894 0.40887 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24084e-07 ( -4.0899e-08 4.0674e-08 ) ergs/cm2
Band function
Time interval is from -5.040 sec. to -4.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.615483 ( -0.278397 0.358765 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 154.135 ( -26.7563 243.131 )
Norm@50keV : 0.104520 ( -0.0330989 0.0535562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.30 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.900924e-01
Photon flux (15-150 keV) in 1 sec: 7.00735 ( ) 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] : 19.8916 (-1.3914 1.53107)
R^2/D10^2 : 0.348367 (-0.0744513 0.0927001)
(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 2.663e-08 2.610e-09
25- 50 1.322e-07 9.900e-09
50-150 3.874e-07 3.660e-08
15-150 5.462e-07 3.925e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 29.0999 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.246e-08 4.170e-09
25- 50 1.394e-07 9.650e-09
50-150 3.057e-07 6.650e-08
15-150 5.176e-07 8.020e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.98258 (-2.21379 2.52628)
R1^2/D10^2 : 2.36158 (-1.12657 3.05473)
kT2 [keV] : 32.1924 (-5.95689 12.4112)
R2^2/D10^2 : 5.95024E-02 (-0.0390839 0.0632439)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.629e-08 1.294e-08
25- 50 1.371e-07 3.570e-08
50-150 4.452e-07 1.646e-07
15-150 6.286e-07 1.787e-07
Plot creation:
Wed Dec 6 12:17:55 EST 2023