batgrbproduct analysis for trigger=1204595
batgrbproduct Analysis for Trigger=1204595
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 27 00:16:18 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1204595/GCN5_download_cron
======================================================================
Trigger: 01204595 Segment: 000
BAT Trigger Time: 725261216 [s; MET]
Trigger Stop: 725261432 [s; MET]
UTC: 2023-12-26T05:26:23.384960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.079749627924 Dec: -15.8827401392319 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 245.079749627924 Dec: -15.8827401392319 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.072927922347 Dec: -15.87866018336 [deg; J2000]
{ 16h 20m 17.5s , -15d 52' 43.2" }
+/- 2.62940087349167 [arcmin] (estimated 90% radius based on SNR)
+/- 1.44084685899063 [arcmin] (formal 1-sigma fit error)
SNR: 7.64403993547361
Angular difference between Flight and Ground position is 0.463584 arcmin
Partial Coding Fraction: 0.1660156 [ including projection effects ]
Duration
T90: 424.384000062943 +/- 51.1035817256338
Measured from: -131.431999921799
to: 292.952000141144 [s; relative to TRIGTIME]
T50: 216.832000136375 +/- 38.8750778446745
Measured from: -51.6719999313354
to: 165.16000020504 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 159.723999977112
to: 160.723999977112 [s; relative to TRIGTIME]
Total Fluence
Measured from: -159.879999995232
to: 327.463999986649 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.948081 2.350564 0.896854 0.230600
0.336119 0.327173 0.280002 0.247735 [error]
Peak 0.061288 0.049911 0.023963 -0.012903
0.015614 0.015184 0.013545 0.012065 [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 3.82e-06 8.93e-07 1.07e-07 1.44e-08 4.83e-06 4.84e-06 erg/cm2
Error 4.78e-07 2.33e-07 7.34e-08 1.85e-08 4.72e-07 4.72e-07 erg/cm2
Peak flux Power-law 7.32e-01 3.19e-01 8.28e-02 2.65e-02 1.15e+00 1.16e+00 ph/cm2/s
Error 2.90e-01 1.21e-01 6.54e-02 2.86e-02 3.91e-01 3.92e-01 ph/cm2/s
Fluence Cutoff-PL 3.83e-06 8.89e-07 1.06e-07 1.40e-08 4.83e-06 4.83e-06 erg/cm2
Error 4.78e-07 -------- -------- -------- 4.72e-07 4.72e-07 erg/cm2
Peak flux Cutoff-PL 7.36e-01 3.19e-01 7.88e-02 2.35e-02 1.15e+00 1.15e+00 ph/cm2/s
Error -------- -------- -------- 2.86e-02 -------- 3.99e-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 5.055 0.581 - - 1.93e-04 1.02e-04 69.310 57
CPL 1.822 0.000 1.1 0.0 1.07e-01 0.00e+00 79.250 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.945 0.719 - - 4.35e-03 2.30e-03 58.110 57
CPL 1.978 0.117 1.5 20.2 1.27e-02 0.00e+00 59.010 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 487.344 -159.880 327.464
T90 424.384 -131.432 292.952
T50 216.832 -51.672 165.160
Peak 1.000 159.724 160.724
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.0729 -15.8787 0.0252 42.1 -58.3 12.2146 7.6 TRIG_01204595
------------------------------------------
Foreground time interval of the image:
-147.699 23.840 (delta_t = 171.539 [sec])
25.000 105.450 (delta_t = 80.450 [sec])
107.000 130.630 (delta_t = 23.630 [sec])
132.000 244.901 (delta_t = 112.901 [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
Multiple GTIs in the spectrum
tstart tstop
-159.880000 23.840000
25.000000 105.450000
107.000000 130.630000
132.000000 327.464000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.05544 ( -0.572929 0.589818 )
Norm@50keV : 1.92818E-04 ( -8.1148e-05 0.000122727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 57 degrees of freedom
# Null hypothesis probability = 1.270890e-01
Photon flux (15-150 keV) in 483.3 sec: 0.313724 ( -0.0338148 0.0339817 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83208e-06 ( -4.71884e-07 4.71886e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-159.880000 23.840000
25.000000 105.450000
107.000000 130.630000
132.000000 327.464000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82156 ( )
Epeak [keV] : 1.08208 ( )
Norm@50keV : 0.106679 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.25 using 59 PHA bins.
# Reduced chi-squared = 1.415 for 56 degrees of freedom
# Null hypothesis probability = 2.213226e-02
Photon flux (15-150 keV) in 483.3 sec: 0.313639 ( -0.033966 0.033728 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83011e-06 ( -4.71696e-07 4.71696e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-159.880000 23.840000
25.000000 105.450000
107.000000 130.630000
132.000000 327.464000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.91875 ( 9.91875 9.91875 )
beta : -5.02792 ( -0.614412 0.550091 )
Epeak [keV] : 1.94310 ( -1.9431 -1.9431 )
Norm@50keV : 2.68725E-02 ( -0.0115166 0.0162145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Null hypothesis probability = 9.275635e-02
Photon flux (15-150 keV) in 483.3 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] : 2.73575 (-0.273584 0.329819)
R^2/D10^2 : 79.5550 (-44.5981 98.6256)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.06 using 59 PHA bins.
# Reduced chi-squared = 1.492 for 57 degrees of freedom
# Null hypothesis probability = 9.391409e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.960e-06 1.069e-06
25- 50 4.135e-07 1.389e-07
50-150 3.036e-10 2.387e-10
15-150 4.374e-06 1.021e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.34870 (-0.862619 1.22376)
Norm : 55.7233 (-28.4722 56.3461)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.910e-06 8.765e-07
25- 50 5.734e-07 1.618e-07
50-150 4.132e-09 3.037e-09
15-150 4.488e-06 8.533e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.32862 (-0.274896 0.305922)
R1^2/D10^2 : 243.095 (-148.572 427.951)
kT2 [keV] : 12.6293 (-3.44389 5.8591)
R2^2/D10^2 : 1.51162E-02 (-0.0118092 0.0426346)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.033e-06 1.858e-06
25- 50 1.032e-06 4.832e-07
50-150 8.171e-07 5.550e-07
15-150 5.882e-06 2.257e-06
Peak spectrum fit
Power-law model
Time interval is from 159.724 sec. to 160.724 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.94477 ( -0.479399 0.958684 )
Norm@50keV : 4.35167E-03 ( -0.00258905 0.00200337 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 57 degrees of freedom
# Null hypothesis probability = 4.342629e-01
Photon flux (15-150 keV) in 1 sec: 1.14994 ( -0.391006 0.390075 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10013e-08 ( -1.84384e-08 1.7921e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 159.724 sec. to 160.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97751 ( -0.216032 0.0185822 )
Epeak [keV] : 1.48099 ( -0.882991 39.492 )
Norm@50keV : 1.26628E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 56 degrees of freedom
# Null hypothesis probability = 3.662295e-01
Photon flux (15-150 keV) in 1 sec: 1.15067 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08337e-08 ( -1.80701e-08 1.95727e-08 ) ergs/cm2
Band function
Time interval is from 159.724 sec. to 160.724 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.01352 ( 1.39502 1.39502 )
beta : -2.99300 ( 2.95577 0.487157 )
Epeak [keV] : 15.3836 ( -7.28801 538.195 )
Norm@50keV : 6333.12 ( -6319.64 1.25773e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.96 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.666175e-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] : 3.60697 (-1.21997 3.15649)
R^2/D10^2 : 46.3002 (-46.3243 496.137)
(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 2.493e-08 1.454e-08
25- 50 6.633e-09 4.676e-09
50-150 4.172e-11 4.288e-11
15-150 3.161e-08 1.873e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.8279 (-40.8692 27.1127)
Norm : 7.04688 (-3.26196 60.9995)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.629e-08 6.823e-09
25- 50 2.162e-08 9.185e-09
50-150 1.710e-08 1.047e-08
15-150 5.502e-08 2.471e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.91146 (-1.02448 1.53321)
R1^2/D10^2 : 132.280 (-120.435 2398.87)
kT2 [keV] : 16.9195 (-5.84067 6.44997)
R2^2/D10^2 : 4.47551E-02 (-0.0385087 0.138917)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.309e-08 1.353e-08
25- 50 1.420e-08 9.425e-09
50-150 2.351e-08 1.837e-08
15-150 6.080e-08 3.442e-08
Plot creation:
Wed Dec 27 00:18:58 EST 2023