batgrbproduct analysis for trigger=1221874
batgrbproduct Analysis for Trigger=1221874
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 Apr 16 05:20:08 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1221874/GCN5_download_cron
======================================================================
Trigger: 01221874 Segment: 000
BAT Trigger Time: 734855246.4 [s; MET]
Trigger Stop: 734855247.424 [s; MET]
UTC: 2024-04-15T06:26:53.127400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 129.165633407651 Dec: 73.1465418206604 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.83
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 7.83
Flight Position: [ source = BAT ]
RA: 129.165633407651 Dec: 73.1465418206604 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 129.196798942223 Dec: 73.1504621642696 [deg; J2000]
{ 08h 36m 47.2s , +73d 09' 01.7" }
+/- 1.13809554087358 [arcmin] (estimated 90% radius based on SNR)
+/- 0.469108115933399 [arcmin] (formal 1-sigma fit error)
SNR: 25.2850061264123
Angular difference between Flight and Ground position is 0.590913 arcmin
Partial Coding Fraction: 0.6015625 [ including projection effects ]
Duration
T90: 30.960000038147 +/- 3.58574958264342
Measured from: 0.656000137329102
to: 31.6160001754761 [s; relative to TRIGTIME]
T50: 3.98399996757507 +/- 0.730413672472375
Measured from: 4.54400014877319
to: 8.52800011634827 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.09200000762939
to: 6.09200000762939 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.703999996185303
to: 37.5040000677109 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.432291 1.112165 0.561726 0.055736
0.056900 0.058357 0.049540 0.042661 [error]
Peak 0.239018 0.191981 0.072562 0.010751
0.013754 0.013813 0.010015 0.007582 [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 4.36e-07 5.01e-07 4.13e-07 5.72e-07 1.56e-06 1.92e-06 erg/cm2
Error 3.96e-08 3.01e-08 4.86e-08 1.35e-07 1.07e-07 1.86e-07 erg/cm2
Peak flux Power-law 2.41e+00 1.46e+00 5.69e-01 2.96e-01 4.60e+00 4.74e+00 ph/cm2/s
Error 2.70e-01 1.17e-01 8.38e-02 8.12e-02 3.70e-01 3.75e-01 ph/cm2/s
Fluence Cutoff-PL 4.37e-07 5.01e-07 4.12e-07 5.64e-07 1.56e-06 1.91e-06 erg/cm2
Error 3.99e-08 3.03e-08 -------- -------- 1.10e-07 2.47e-07 erg/cm2
Peak flux Cutoff-PL 2.38e+00 1.49e+00 5.62e-01 2.23e-01 4.57e+00 4.66e+00 ph/cm2/s
Error 2.91e-01 1.50e-01 9.12e-02 1.49e-01 3.82e-01 4.29e-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 2.278 0.133 - - 4.28e-03 3.53e-04 60.140 57
CPL 1.996 0.104 0.6 0.4 6.01e-03 0.00e+00 62.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.364 0.161 - - 2.54e-02 2.81e-03 65.070 57
CPL 1.988 -0.723 1.3 12.0 4.24e-02 7.18e-03 65.090 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: 8.384000 sec.
T50 in the 50-300 keV band: 4.160000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 38.208 -0.704 37.504
T90 30.960 0.656 31.616
T50 3.984 4.544 8.528
Peak 1.000 5.092 6.092
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
129.1968 +73.1505 0.0076 27.1 -111.2 3.3043 25.3 TRIG_01221874
------------------------------------------
Foreground time interval of the image:
-0.704 37.504 (delta_t = 38.208 [sec])
Background time interval of the image:
-60.400 -28.429 (delta_t = 31.970 [sec])
-27.400 -0.704 (delta_t = 26.696 [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 -0.704 sec. to 37.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27790 ( -0.130213 0.134977 )
Norm@50keV : 4.28193E-03 ( -0.000356107 0.000350114 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.626950e-01
Photon flux (15-150 keV) in 38.21 sec: 0.739215 ( -0.0451927 0.0453256 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55732e-06 ( -1.05874e-07 1.07195e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.704 sec. to 37.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99635 ( -0.205756 0.00221471 )
Epeak [keV] : 0.611727 ( -0.230607 0.663002 )
Norm@50keV : 6.00706E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.20 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 56 degrees of freedom
# Null hypothesis probability = 2.650177e-01
Photon flux (15-150 keV) in 38.21 sec: 0.738863 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.556e-06 ( -1.10736e-07 1.08513e-07 ) ergs/cm2
Band function
Time interval is from -0.704 sec. to 37.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.48596 ( 2.48596 2.48596 )
beta : -2.27790 ( -0.134973 0.130226 )
Epeak [keV] : 3.03042 ( -3.03042 -3.03042 )
Norm@50keV : 0.581974 ( -0.048399 0.0475865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.949667e-01
Photon flux (15-150 keV) in 38.21 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] : 8.25798 ( )
R^2/D10^2 : 0.654423 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 147.89 using 59 PHA bins.
# Reduced chi-squared = 2.5945 for 57 degrees of freedom
# Null hypothesis probability = 5.245054e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.154e-07 3.506e-08
25- 50 5.829e-07 4.394e-08
50-150 1.697e-07 3.450e-08
15-150 1.068e-06 7.738e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 47.3350 (-8.03612 10.8876)
Norm : 4.15371 (-0.496718 0.61787)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.830e-07 3.215e-08
25- 50 5.391e-07 3.573e-08
50-150 4.966e-07 8.139e-08
15-150 1.419e-06 1.070e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08700 (-0.604841 0.648049)
R1^2/D10^2 : 4.03512 (-1.62709 3.05624)
kT2 [keV] : 21.0865 (-3.48251 4.68362)
R2^2/D10^2 : 1.19835E-02 (-0.0062636 0.0120313)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.399e-07 7.092e-08
25- 50 4.715e-07 8.219e-08
50-150 6.681e-07 1.982e-07
15-150 1.579e-06 3.064e-07
Peak spectrum fit
Power-law model
Time interval is from 5.092 sec. to 6.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36419 ( -0.157127 0.164779 )
Norm@50keV : 2.53798E-02 ( -0.002835 0.00278396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.07 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.164383e-01
Photon flux (15-150 keV) in 1 sec: 4.59933 ( -0.369598 0.3699 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45635e-07 ( -2.20287e-08 2.22812e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.092 sec. to 6.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98800 ( -0.542099 -1.988 )
Epeak [keV] : 1.27119 ( -0.434837 23.4722 )
Norm@50keV : 4.24425E-02 ( -0.00690076 0.00746035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.09 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.896845e-01
Photon flux (15-150 keV) in 1 sec: 4.57050 ( -0.38228 0.38152 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41456e-07 ( -2.6196e-08 2.5504e-08 ) ergs/cm2
Band function
Time interval is from 5.092 sec. to 6.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.57629 ( 2.57629 2.57629 )
beta : -2.36417 ( -0.164801 0.157218 )
Epeak [keV] : 9.84871 ( -9.84871 -9.84871 )
Norm@50keV : 3.44950 ( -0.385353 0.378344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.07 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 55 degrees of freedom
# Null hypothesis probability = 1.661589e-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] : 7.86706 (-0.722659 0.794993)
R^2/D10^2 : 5.22313 (-1.73127 2.60468)
(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 5.772e-08 7.660e-09
25- 50 9.810e-08 1.009e-08
50-150 2.437e-08 6.735e-09
15-150 1.802e-07 1.805e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.3158 (-7.27038 9.72213)
Norm : 29.7206 (-4.7516 5.76855)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.785e-08 7.395e-09
25- 50 8.859e-08 7.655e-09
50-150 6.725e-08 1.656e-08
15-150 2.237e-07 2.200e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.61697 (-1.05256 1.00442)
R1^2/D10^2 : 17.5634 (-8.23111 15.0253)
kT2 [keV] : 21.4043 (-6.73877 13.6952)
R2^2/D10^2 : 5.53218E-02 (-0.0450466 0.151203)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.130e-08 1.664e-08
25- 50 8.199e-08 1.564e-08
50-150 8.842e-08 4.692e-08
15-150 2.417e-07 6.870e-08
Plot creation:
Tue Apr 16 05:22:01 EDT 2024