batgrbproduct analysis for trigger=1177054
batgrbproduct Analysis for Trigger=1177054
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): Thu Jun 29 22:37:15 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1177054/GCN5_download_cron
======================================================================
Trigger: 01177054 Segment: 000
BAT Trigger Time: 709684002.24 [s; MET]
Trigger Stop: 709684004.288 [s; MET]
UTC: 2023-06-28T22:26:10.691020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 171.841393571743 Dec: -11.4466429476081 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.38
Image Trigger?: NO
Rate S/N Ratio: 11.13552872566 [ if not an image trigger ]
Image S/N Ratio: 7.38
Flight Position: [ source = BAT ]
RA: 171.841393571743 Dec: -11.4466429476081 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 171.851395235016 Dec: -11.4295880354886 [deg; J2000]
{ 11h 27m 24.3s , -11d 25' 46.5" }
+/- 2.44876617871219 [arcmin] (estimated 90% radius based on SNR)
+/- 0.95750973124402 [arcmin] (formal 1-sigma fit error)
SNR: 8.46212339187065
Angular difference between Flight and Ground position is 1.180292 arcmin
Partial Coding Fraction: 0.4101562 [ including projection effects ]
Duration
T90: 4.72000014781952 +/- 1.07569511600871
Measured from: -0.327999949455261
to: 4.39200019836426 [s; relative to TRIGTIME]
T50: 2.03200006484985 +/- 1.25844345524082
Measured from: 0.632000088691711
to: 2.66400015354156 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.332000017166138
to: 1.33200001716614 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.504000067710876
to: 4.80799996852875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.089706 0.173103 0.166516 0.016080
0.029848 0.030006 0.025747 0.021633 [error]
Peak 0.025629 0.033844 0.056430 0.028964
0.013729 0.013597 0.011906 0.010056 [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 4.17e-08 7.93e-08 1.16e-07 3.66e-07 3.29e-07 6.03e-07 erg/cm2
Error 1.33e-08 1.56e-08 2.41e-08 1.65e-07 6.03e-08 1.80e-07 erg/cm2
Peak flux Power-law 2.44e-01 3.33e-01 3.36e-01 6.16e-01 1.11e+00 1.53e+00 ph/cm2/s
Error 1.65e-01 1.37e-01 8.90e-02 3.89e-01 3.43e-01 4.11e-01 ph/cm2/s
Fluence Cutoff-PL 3.50e-08 8.41e-08 1.26e-07 1.53e-07 3.19e-07 3.98e-07 erg/cm2
Error 1.68e-08 1.83e-08 2.92e-08 2.52e-07 6.35e-08 2.37e-07 erg/cm2
Peak flux Cutoff-PL 2.46e-01 3.35e-01 3.36e-01 6.07e-01 1.11e+00 1.52e+00 ph/cm2/s
Error 1.75e-01 1.38e-01 9.10e-02 5.43e-01 3.44e-01 5.37e-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 1.446 0.297 - - 6.48e-03 1.13e-03 60.850 57
CPL 0.659 1.341 93.7 -30.4 1.50e-02 3.77e-02 59.740 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.986 0.542 - - 9.66e-03 2.92e-03 42.690 57
CPL 0.916 0.000 958.9 0.0 1.03e-02 0.00e+00 42.730 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: 1.344000 sec.
T50 in the 50-300 keV band: 0.832000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 5.312 -0.504 4.808
T90 4.720 -0.328 4.392
T50 2.032 0.632 2.664
Peak 1.000 0.332 1.332
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
171.8514 -11.4296 0.0227 46.2 -6.9 0.5046 8.5 TRIG_01177054
------------------------------------------
Foreground time interval of the image:
-0.504 4.808 (delta_t = 5.312 [sec])
Background time interval of the image:
-239.240 -225.310 (delta_t = 13.930 [sec])
-223.240 -0.504 (delta_t = 222.736 [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 -0.504 sec. to 4.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44579 ( -0.298186 0.295553 )
Norm@50keV : 6.47667E-03 ( -0.00112606 0.00112586 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.85 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.390713e-01
Photon flux (15-150 keV) in 5.312 sec: 0.797335 ( -0.148159 0.149414 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29476e-07 ( -6.01632e-08 6.05191e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.504 sec. to 4.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.658886 ( -1.68014 1.00186 )
Epeak [keV] : 93.6610 ( -32.7937 -93.6596 )
Norm@50keV : 1.50064E-02 ( -0.00935392 0.0660141 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.74 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.414391e-01
Photon flux (15-150 keV) in 5.312 sec: 0.767274 ( -0.151428 0.157272 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1856e-07 ( -6.35459e-08 6.35267e-08 ) ergs/cm2
Band function
Time interval is from -0.504 sec. to 4.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.672564 ( -0.669486 1.13498 )
beta : -9.37167 ( 9.37154 19.3715 )
Epeak [keV] : 95.0990 ( -31.907 197.423 )
Norm@50keV : 1.46992E-02 ( -0.00739783 0.0116833 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.74 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.075217e-01
Photon flux (15-150 keV) in 5.312 sec: 0.723607 ( ) 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] : 17.4556 (-3.12163 3.99806)
R^2/D10^2 : 5.54217E-02 (-0.0288553 0.0558725)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.553143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.813e-08 6.579e-09
25- 50 8.191e-08 2.602e-08
50-150 1.796e-07 5.944e-08
15-150 2.797e-07 8.005e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-84.7193 -199.363)
Norm : 3.33439 (-0.57908 0.579136)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.411e-08 2.550e-08
25- 50 8.484e-08 4.815e-08
50-150 1.861e-07 1.054e-07
15-150 3.150e-07 1.791e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.79309 (-4.66454 10.5197)
R1^2/D10^2 : 2.42018 (-2.2889 -2.35926)
kT2 [keV] : 20.6449 (-4.95682 46.5231)
R2^2/D10^2 : 2.80643E-02 (-0.0275214 0.0505537)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.841e-08 2.158e-08
25- 50 7.695e-08 4.204e-08
50-150 1.955e-07 1.124e-07
15-150 3.109e-07 1.599e-07
Peak spectrum fit
Power-law model
Time interval is from 0.332 sec. to 1.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986453 ( -0.584929 0.49833 )
Norm@50keV : 9.66270E-03 ( -0.00303315 0.00281052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.69 using 59 PHA bins.
# Reduced chi-squared = 0.7490 for 57 degrees of freedom
# Null hypothesis probability = 9.204469e-01
Photon flux (15-150 keV) in 1 sec: 1.11163 ( -0.337743 0.349234 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05002e-07 ( -2.78209e-08 2.78655e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.332 sec. to 1.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.915718 ( )
Epeak [keV] : 958.912 ( )
Norm@50keV : 1.03344E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.73 using 59 PHA bins.
# Reduced chi-squared = 0.7630 for 56 degrees of freedom
# Null hypothesis probability = 9.040865e-01
Photon flux (15-150 keV) in 1 sec: 1.11442 ( -0.342698 0.3446 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04905e-07 ( -2.75629e-08 2.7832e-08 ) ergs/cm2
Band function
Time interval is from 0.332 sec. to 1.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.837733 ( 0.837663 0.837663 )
beta : -0.986461 ( 0.986448 0.584999 )
Epeak [keV] : 32.1024 ( -32.2336 -32.2336 )
Norm@50keV : 1.62597E-02 ( -0.00915252 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.69 using 59 PHA bins.
# Reduced chi-squared = 0.7762 for 55 degrees of freedom
# Null hypothesis probability = 8.867782e-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] : 25.5638 (-7.62227 16.2093)
R^2/D10^2 : 2.44625E-02 (-0.0244447 0.0535976)
(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 2.744e-09 1.779e-09
25- 50 1.574e-08 9.680e-09
50-150 7.602e-08 4.526e-08
15-150 9.451e-08 5.865e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-79.8466 -200)
Norm : 4.98531 (-1.37946 1.37946)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.243e-08 7.745e-09
25- 50 2.391e-08 1.439e-08
50-150 5.243e-08 3.122e-08
15-150 8.877e-08 5.295e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.10796 (-4.1029 25.7933)
R1^2/D10^2 : 7.72667 (-7.7596 -7.7596)
kT2 [keV] : 29.6499 (-9.97827 -29.649)
R2^2/D10^2 : 1.47878E-02 (-0.0147899 0.0410166)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.003e-08 6.295e-09
25- 50 1.568e-08 8.330e-09
50-150 7.849e-08 4.580e-08
15-150 1.042e-07 5.830e-08
Plot creation:
Thu Jun 29 22:41:00 EDT 2023