batgrbproduct analysis for trigger=1221183
batgrbproduct Analysis for Trigger=1221183
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): Fri Apr 12 09:48:27 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1221183/GCN5_download_cron
======================================================================
Trigger: 01221183 Segment: 000
BAT Trigger Time: 734542407.104 [s; MET]
Trigger Stop: 734542409.152 [s; MET]
UTC: 2024-04-11T15:32:53.852800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.561347866817 Dec: -2.15328247773132 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.94
Image Trigger?: NO
Rate S/N Ratio: 11.3578166916005 [ if not an image trigger ]
Image S/N Ratio: 7.94
Flight Position: [ source = BAT ]
RA: 231.561347866817 Dec: -2.15328247773132 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 231.561623073005 Dec: -2.17248047447105 [deg; J2000]
{ 15h 26m 14.8s , -02d 10' 20.9" }
+/- 3.29178233552459 [arcmin] (estimated 90% radius based on SNR)
+/- 2.25595177181918 [arcmin] (formal 1-sigma fit error)
SNR: 5.54537703370491
Angular difference between Flight and Ground position is 1.151998 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 33.2640000581741 +/- 1.49495149473776
Measured from: 0.288000106811523
to: 33.5520001649857 [s; relative to TRIGTIME]
T50: 29.6800000667572 +/- 20.7617879035588
Measured from: 1.63200008869171
to: 31.3120001554489 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 32.8680000305176
to: 33.8680000305176 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.368000030517578
to: 33.9200000762939 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.230646 0.327409 0.185334 0.123301
0.060553 0.062910 0.052996 0.045057 [error]
Peak 0.035398 0.042079 0.036855 0.011171
0.011974 0.011605 0.010339 0.007818 [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 8.11e-08 1.32e-07 1.64e-07 4.00e-07 4.91e-07 7.78e-07 erg/cm2
Error 2.94e-08 2.99e-08 5.25e-08 2.78e-07 1.24e-07 3.22e-07 erg/cm2
Peak flux Power-law 3.45e-01 3.18e-01 2.03e-01 2.00e-01 9.49e-01 1.07e+00 ph/cm2/s
Error 1.67e-01 1.02e-01 7.61e-02 1.47e-01 2.96e-01 3.21e-01 ph/cm2/s
Fluence Cutoff-PL 8.17e-08 1.33e-07 1.63e-07 3.90e-07 4.89e-07 7.68e-07 erg/cm2
Error 2.93e-08 3.01e-08 5.24e-08 3.08e-07 1.23e-07 3.52e-07 erg/cm2
Peak flux Cutoff-PL 2.91e-01 3.61e-01 2.17e-01 6.19e-02 9.16e-01 9.31e-01 ph/cm2/s
Error 1.66e-01 1.32e-01 9.76e-02 1.46e-01 3.01e-01 3.51e-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 1.694 0.414 - - 1.54e-03 3.70e-04 42.870 57
CPL 2.226 1.178 86.3 0.0 7.79e-04 0.00e+00 42.430 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.646 0.495 - - 7.27e-03 2.26e-03 59.510 57
CPL 0.450 2.525 60.7 -4.9 3.16e-02 9.74e-01 58.570 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 34.288 -0.368 33.920
T90 33.264 0.288 33.552
T50 29.680 1.632 31.312
Peak 1.000 32.868 33.868
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
231.5616 -2.1725 0.0347 40.1 0.1 0.5483 5.5 TRIG_01221183
------------------------------------------
Foreground time interval of the image:
-0.368 24.997 (delta_t = 25.365 [sec])
Background time interval of the image:
-114.703 -0.368 (delta_t = 114.335 [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 -0.368 sec. to 33.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69418 ( -0.408267 0.420035 )
Norm@50keV : 1.54450E-03 ( -0.000376951 0.000363786 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.87 using 59 PHA bins.
# Reduced chi-squared = 0.7522 for 57 degrees of freedom
# Null hypothesis probability = 9.173828e-01
Photon flux (15-150 keV) in 34.29 sec: 0.204711 ( -0.0462467 0.0463701 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90584e-07 ( -1.2257e-07 1.24864e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.368 sec. to 33.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22594 ( -1.34449 1.012 )
Epeak [keV] : 86.3211 ( )
Norm@50keV : 7.79274E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.43 using 59 PHA bins.
# Reduced chi-squared = 0.7578 for 56 degrees of freedom
# Null hypothesis probability = 9.096479e-01
Photon flux (15-150 keV) in 34.29 sec: 0.205552 ( -0.047022 0.045637 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8914e-07 ( -1.21198e-07 1.2463e-07 ) ergs/cm2
Band function
Time interval is from -0.368 sec. to 33.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.73413 ( -4.73413 -4.73413 )
beta : -1.78825 ( -0.528394 0.460103 )
Epeak [keV] : 22.8350 ( -22.835 11.8576 )
Norm@50keV : 216.754 ( -47.7487 1.69575e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.61 using 59 PHA bins.
# Reduced chi-squared = 0.7748 for 55 degrees of freedom
# Null hypothesis probability = 8.885088e-01
Photon flux (15-150 keV) in 34.29 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] : 9.68873 (-2.29842 3.7149)
R^2/D10^2 : 0.107347 (-0.0761197 0.196094)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.8897 for 57 degrees of freedom
# Null hypothesis probability = 7.084396e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.956e-08 2.962e-08
25- 50 1.653e-07 7.710e-08
50-150 7.865e-08 4.896e-08
15-150 3.135e-07 1.476e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.487 (-105.992 -161.803)
Norm : 0.825647 (-0.194445 0.350662)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.214e-08 4.195e-08
25- 50 1.353e-07 7.537e-08
50-150 2.765e-07 1.665e-07
15-150 4.840e-07 2.851e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.57615 (-2.06901 2.20933)
R1^2/D10^2 : 0.240253 (-0.100122 0.445878)
kT2 [keV] : 85.9372 (-157.121 -187.603)
R2^2/D10^2 : 1.09335E-04 (-1.52623e-05 0.00128051)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.379e-08 4.910e-08
25- 50 1.454e-07 8.151e-08
50-150 3.066e-07 1.792e-07
15-150 5.357e-07 2.772e-07
Peak spectrum fit
Power-law model
Time interval is from 32.868 sec. to 33.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64635 ( -0.488249 0.501252 )
Norm@50keV : 7.27418E-03 ( -0.00227249 0.00224368 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.51 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.844024e-01
Photon flux (15-150 keV) in 1 sec: 0.948688 ( -0.295082 0.297283 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.76778e-08 ( -2.17021e-08 2.21036e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.868 sec. to 33.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.450353 ( -3.29489 1.7552 )
Epeak [keV] : 60.7069 ( -50.8681 -60.7041 )
Norm@50keV : 3.15981E-02 ( -0.0316021 1.91575 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.57 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.811969e-01
Photon flux (15-150 keV) in 1 sec: 0.916097 ( -0.29958 0.302943 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25693e-08 ( -2.26274e-08 2.40703e-08 ) ergs/cm2
Band function
Time interval is from 32.868 sec. to 33.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95236 ( -4.95236 -4.95236 )
beta : -1.99647 ( -1.45731 0.653952 )
Epeak [keV] : 30.2800 ( -30.28 13.6976 )
Norm@50keV : 267.707 ( -78.5149 6.49699e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.89 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Null hypothesis probability = 3.690552e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.48323e-08 ( -6.48253e-08 -2.2189e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2612 (-4.02631 5.72081)
R^2/D10^2 : 0.169473 (-0.169119 0.466838)
(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 6.318e-09 3.965e-09
25- 50 2.223e-08 1.280e-08
50-150 2.500e-08 1.644e-08
15-150 5.354e-08 3.306e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 147.870 (-94.253 -144.714)
Norm : 3.96933 (-1.27404 2.06907)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.021e-08 6.030e-09
25- 50 1.888e-08 1.105e-08
50-150 3.704e-08 2.395e-08
15-150 6.613e-08 4.050e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.51522 (-7.48203 -7.48203)
R1^2/D10^2 : 0.795545 (-0.807057 -0.807057)
kT2 [keV] : 21.5508 (-21.6577 -21.6577)
R2^2/D10^2 : 1.92053E-02 (-0.0191499 0.364148)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.391e-09 5.750e-09
25- 50 2.080e-08 1.340e-08
50-150 3.275e-08 2.059e-08
15-150 6.294e-08 3.560e-08
Plot creation:
Fri Apr 12 09:51:47 EDT 2024