batgrbproduct analysis for trigger=1118357
batgrbproduct Analysis for Trigger=1118357
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): Sun Jul 31 20:29:37 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1118357/batgroup_hand_proc
======================================================================
Trigger: 01118357 Segment: 000
BAT Trigger Time: 680888964.592 [s; MET]
Trigger Stop: 680888964.656 [s; MET]
UTC: 2022-07-30T15:48:55.003620 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 225.020886217671 Dec: -69.4969465256892 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10
Image Trigger?: NO
Rate S/N Ratio: 55.937465083788 [ if not an image trigger ]
Image S/N Ratio: 10
Flight Position: [ source = BAT ]
RA: 225.020886217671 Dec: -69.4969465256892 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 224.988074451063 Dec: -69.4956917281265 [deg; J2000]
{ 14h 59m 57.1s , -69d 29' 44.5" }
+/- 1.69811084452184 [arcmin] (estimated 90% radius based on SNR)
+/- 0.515617280996671 [arcmin] (formal 1-sigma fit error)
SNR: 14.2756362088088
Angular difference between Flight and Ground position is 0.693672 arcmin
Partial Coding Fraction: 0.6015625 [ including projection effects ]
Duration
T90: 0.191999793052673 +/- 0.202385803424389
Measured from: -0.0399999618530273
to: 0.151999831199646 [s; relative to TRIGTIME]
T50: 0.127999901771545 +/- 0.064
Measured from: -0.0399999618530273
to: 0.0879999399185181 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.348000049591064
to: 0.651999950408936 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0399999618530273
to: 0.279999971389771 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.030887 0.048419 0.072809 0.042670
0.006452 0.007171 0.007790 0.006687 [error]
Peak 0.037302 0.061274 0.074701 0.041088
0.010362 0.010372 0.010116 0.008591 [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 6.82e-09 2.18e-08 5.71e-08 4.35e-07 1.56e-07 5.21e-07 erg/cm2
Error 2.28e-09 4.24e-09 6.79e-09 1.39e-07 1.92e-08 1.39e-07 erg/cm2
Peak flux Power-law 3.00e-01 4.56e-01 5.19e-01 1.13e+00 1.61e+00 2.40e+00 ph/cm2/s
Error 1.18e-01 1.07e-01 7.72e-02 4.07e-01 2.64e-01 4.00e-01 ph/cm2/s
Fluence Cutoff-PL 6.70e-09 2.16e-08 5.72e-08 4.07e-07 1.56e-07 4.92e-07 erg/cm2
Error 2.21e-09 4.23e-09 6.79e-09 1.63e-07 1.91e-08 1.61e-07 erg/cm2
Peak flux Cutoff-PL 3.09e-01 4.63e-01 5.18e-01 1.09e+00 1.62e+00 2.38e+00 ph/cm2/s
Error 1.20e-01 -------- 7.81e-02 4.65e-01 2.64e-01 4.68e-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 0.608 0.253 - - 3.82e-02 5.50e-03 42.650 57
CPL 0.599 0.257 10000.0 0.0 3.85e-02 5.10e-03 42.720 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.814 0.306 - - 1.40e-02 2.37e-03 52.890 57
CPL 0.812 0.309 9999.2 0.0 1.41e-02 5.62e-03 52.920 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.320 -0.040 0.280
T90 0.192 -0.040 0.152
T50 0.128 -0.040 0.088
Peak 1.000 -0.348 0.652
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
224.9881 -69.4957 0.0134 37.4 -155.4 0.1980 14.3 TRIG_01118357
------------------------------------------
Foreground time interval of the image:
-0.040 0.280 (delta_t = 0.320 [sec])
Background time interval of the image:
-239.592 -0.040 (delta_t = 239.552 [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 -0.040 sec. to 0.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.608331 ( -0.261668 0.245151 )
Norm@50keV : 3.82023E-02 ( -0.00564013 0.00536654 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.65 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.21e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 0.32 sec: 4.45583 ( -0.572431 0.575082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55708e-07 ( -1.91858e-08 1.91613e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.040 sec. to 0.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.599445 ( -0.288128 0.226864 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 3.85154E-02 ( -0.00567292 0.00452111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.72 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.04e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 0.32 sec: 4.45616 ( -0.57459 0.57252 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56039e-07 ( -1.94541e-08 1.86909e-08 ) ergs/cm2
Band function
Time interval is from -0.040 sec. to 0.280 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.883091 ( 0.883151 0.883151 )
beta : -0.608393 ( -0.245204 0.26209 )
Epeak [keV] : 12.7234 ( -12.7231 -12.7231 )
Norm@50keV : 5.87982E-02 ( -0.0256452 0 )
------------------------------------------------------------
Photon flux (15-150 keV) in 0.32 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] : 39.4959 (-7.74502 11.793)
R^2/D10^2 : 3.31519E-02 (-0.0157121 0.0259479)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.09 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.72e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.155e-09 6.510e-10
25- 50 1.464e-08 3.712e-09
50-150 1.378e-07 3.178e-08
15-150 1.546e-07 3.382e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-22.0894 -200)
Norm : 17.9022 (-2.37793 2.37793)
------------------------------------------------------------
#Fit statistic : Chi-Squared 85.62 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.42e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.427e-08 8.086e-09
25- 50 2.745e-08 1.522e-08
50-150 6.020e-08 3.374e-08
15-150 1.019e-07 5.725e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.67077 (-2.21898 3.22147)
R1^2/D10^2 : 7.72292 (-6.37412 46.6781)
kT2 [keV] : 53.5550 (-14.0975 34.683)
R2^2/D10^2 : 1.48107E-02 (-0.00969117 0.0167935)
------------------------------------------------------------
#Fit statistic : Chi-Squared 36.21 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.76e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.110e-08 6.231e-09
25- 50 1.884e-08 8.069e-09
50-150 1.351e-07 6.535e-08
15-150 1.650e-07 6.352e-08
Peak spectrum fit
Power-law model
Time interval is from -0.348 sec. to 0.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.813581 ( -0.318431 0.294031 )
Norm@50keV : 1.40278E-02 ( -0.00241914 0.00231402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.89 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.30e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.61154 ( -0.26236 0.264991 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63001e-07 ( -2.48821e-08 2.49689e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.348 sec. to 0.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.812016 ( -0.327437 0.291242 )
Epeak [keV] : 9999.25 ( -9999.36 -9999.36 )
Norm@50keV : 1.41467E-02 ( -0.00221645 0.00903081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.92 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.92e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.62007 ( -0.27191 0.25638 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62947e-07 ( -2.4826e-08 2.441e-08 ) ergs/cm2
Band function
Time interval is from -0.348 sec. to 0.652 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.803911 ( 0.803782 0.803782 )
beta : -0.813680 ( -0.293825 0.318432 )
Epeak [keV] : 14.0280 ( -14.0303 -14.0303 )
Norm@50keV : 2.13252E-02 ( -0.00990573 377529 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 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] : 32.5091 (-7.55086 11.8869)
R^2/D10^2 : 1.84944E-02 (-0.0104098 0.0211543)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.35 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.35e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.906e-09 1.081e-09
25- 50 1.850e-08 6.822e-09
50-150 1.333e-07 3.964e-08
15-150 1.547e-07 4.950e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-34.0704 -200)
Norm : 6.85207 (-1.09139 1.09139)
------------------------------------------------------------
#Fit statistic : Chi-Squared 72.07 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.62e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.705e-08 9.850e-09
25- 50 3.281e-08 1.860e-08
50-150 7.195e-08 3.955e-08
15-150 1.218e-07 6.815e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.03909 (-3.22373 3.80581)
R1^2/D10^2 : 0.854820 (-0.660922 4.26457)
kT2 [keV] : 54.9488 (-20.0475 -54.9487)
R2^2/D10^2 : 4.23217E-03 (-0.0031434 0.0097652)
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.62 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.43e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.132e-08 6.510e-09
25- 50 2.725e-08 1.534e-08
50-150 1.321e-07 7.210e-08
15-150 1.707e-07 8.850e-08
Plot creation:
Sun Jul 31 20:36:55 EDT 2022