batgrbproduct analysis for trigger=1107050
batgrbproduct Analysis for Trigger=1107050
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 May 19 08:43:22 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1107050/GCN5_download_cron
======================================================================
Trigger: 01107050 Segment: 000
BAT Trigger Time: 674547590.016 [s; MET]
Trigger Stop: 674547591.04 [s; MET]
UTC: 2022-05-18T06:19:20.857540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 55.3694374195284 Dec: -47.5710041605747 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.46
Image Trigger?: NO
Rate S/N Ratio: 11.8321595661992 [ if not an image trigger ]
Image S/N Ratio: 9.46
Flight Position: [ source = BAT ]
RA: 55.3694374195284 Dec: -47.5710041605747 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 55.340161597793 Dec: -47.5934206499884 [deg; J2000]
{ 03h 41m 21.6s , -47d 35' 36.3" }
+/- 1.95112570212834 [arcmin] (estimated 90% radius based on SNR)
+/- 0.881836936328072 [arcmin] (formal 1-sigma fit error)
SNR: 11.7064486873549
Angular difference between Flight and Ground position is 1.792446 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 12.2879998683929 +/- 3.06616103621451
Measured from: -7.52799987792969
to: 4.75999999046326 [s; relative to TRIGTIME]
T50: 5.37599980831146 +/- 1.55850187499417
Measured from: -4.51999986171722
to: 0.855999946594238 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0679999589920044
to: 1.067999958992 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.36000001430511
to: 7.57599997520447 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.260445 0.371527 0.238638 0.038093
0.038551 0.040185 0.034898 0.029419 [error]
Peak 0.048569 0.080390 0.070581 0.018215
0.010353 0.011273 0.010085 0.008020 [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 9.66e-08 1.56e-07 1.90e-07 4.55e-07 5.72e-07 8.97e-07 erg/cm2
Error 1.85e-08 1.94e-08 3.31e-08 1.62e-07 7.94e-08 1.93e-07 erg/cm2
Peak flux Power-law 5.92e-01 5.98e-01 4.25e-01 4.80e-01 1.80e+00 2.09e+00 ph/cm2/s
Error 1.48e-01 9.69e-02 7.55e-02 1.67e-01 2.78e-01 3.13e-01 ph/cm2/s
Fluence Cutoff-PL 8.92e-08 1.68e-07 1.95e-07 1.85e-07 5.47e-07 6.37e-07 erg/cm2
Error 2.13e-08 1.96e-08 3.68e-08 2.69e-07 8.66e-08 2.69e-07 erg/cm2
Peak flux Cutoff-PL 5.10e-01 6.43e-01 4.65e-01 2.44e-01 1.77e+00 1.86e+00 ph/cm2/s
Error 1.75e-01 1.16e-01 9.38e-02 2.54e-01 2.81e-01 2.63e-01 ph/cm2/s
Fluence Band 8.67e-08 1.72e-07 1.86e-07 3.20e-07 5.52e-07 7.66e-07 erg/cm2
Error -------- -------- 3.93e-08 -------- -------- -------- erg/cm2
Peak flux Band 5.12e-01 6.43e-01 4.65e-01 2.46e-01 1.77e+00 1.87e+00 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 1.714 0.211 - - 3.88e-03 5.15e-04 52.080 57
CPL 1.091 0.893 68.4 -26.0 8.36e-03 1.30e-02 50.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.493 0.235 - - 1.45e-02 2.17e-03 58.310 57
CPL 0.726 1.003 87.7 -30.7 3.44e-02 5.32e-02 56.350 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: 1.152000 sec.
T50 in the 50-300 keV band: 0.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.936 -8.360 7.576
T90 12.288 -7.528 4.760
T50 5.376 -4.520 0.856
Peak 1.000 0.068 1.068
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
55.3402 -47.5934 0.0164 41.2 -4.6 0.9105 11.7 TRIG_01107050
------------------------------------------
Foreground time interval of the image:
-8.360 7.576 (delta_t = 15.936 [sec])
Background time interval of the image:
-239.016 -8.360 (delta_t = 230.656 [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 -8.360 sec. to 7.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71424 ( -0.207454 0.213784 )
Norm@50keV : 3.88165E-03 ( -0.000518095 0.000511043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.08 using 59 PHA bins.
# Reduced chi-squared = 0.9138 for 57 degrees of freedom
# Null hypothesis probability = 6.596204e-01
Photon flux (15-150 keV) in 15.94 sec: 0.518117 ( -0.0649733 0.0650641 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72259e-07 ( -7.89167e-08 7.98148e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.360 sec. to 7.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09085 ( -1.03203 0.754437 )
Epeak [keV] : 68.4025 ( -16.326 -68.4026 )
Norm@50keV : 8.36494E-03 ( -0.0049717 0.021074 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.49 using 59 PHA bins.
# Reduced chi-squared = 0.9016 for 56 degrees of freedom
# Null hypothesis probability = 6.827456e-01
Photon flux (15-150 keV) in 15.94 sec: 0.507113 ( -0.066918 0.066803 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.47048e-07 ( -8.60856e-08 8.70675e-08 ) ergs/cm2
Band function
Time interval is from -8.360 sec. to 7.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.636028 ( 0.774896 0.774896 )
beta : -2.04876 ( 2.06134 0.47574 )
Epeak [keV] : 50.4839 ( -50.5354 305.309 )
Norm@50keV : 1.64870E-02 ( -0.0166402 293.164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.29 using 59 PHA bins.
# Reduced chi-squared = 0.9143 for 55 degrees of freedom
# Null hypothesis probability = 6.549015e-01
Photon flux (15-150 keV) in 15.94 sec: 0.506924 ( 6.49308 -0.066882 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.51789e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6508 (-1.76701 2.08625)
R^2/D10^2 : 0.105655 (-0.0455765 0.07822)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.60 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 57 degrees of freedom
# Null hypothesis probability = 2.843135e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.716e-08 1.395e-08
25- 50 1.911e-07 3.500e-08
50-150 1.902e-07 5.052e-08
15-150 4.385e-07 7.556e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 127.964 (-48.5103 -125.072)
Norm : 2.17290 (-0.31816 0.421015)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.994e-08 1.911e-08
25- 50 1.627e-07 4.565e-08
50-150 2.994e-07 1.806e-07
15-150 5.520e-07 1.996e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.07159 (-3.26004 3.37796)
R1^2/D10^2 : 0.564792 (-0.381198 4.47332)
kT2 [keV] : 22.8005 (-8.02001 45.3849)
R2^2/D10^2 : 8.55191E-03 (-0.00802674 0.0159861)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.598e-08 4.828e-08
25- 50 1.717e-07 9.046e-08
50-150 2.880e-07 1.662e-07
15-150 5.457e-07 2.815e-07
Peak spectrum fit
Power-law model
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49343 ( -0.233579 0.237102 )
Norm@50keV : 1.44705E-02 ( -0.00217698 0.00217103 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.31 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.268897e-01
Photon flux (15-150 keV) in 1 sec: 1.80332 ( -0.277588 0.278284 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37423e-07 ( -2.19593e-08 2.20723e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.725855 ( -1.14132 0.865386 )
Epeak [keV] : 87.6642 ( -26.1797 -87.6642 )
Norm@50keV : 3.44487E-02 ( -0.0210807 0.0853739 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.35 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 56 degrees of freedom
# Null hypothesis probability = 4.616957e-01
Photon flux (15-150 keV) in 1 sec: 1.77032 ( -0.28113 0.28156 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34304e-07 ( -2.2857e-08 2.2765e-08 ) ergs/cm2
Band function
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.91004 ( -0.759901 0.793752 )
beta : -1.69526 ( 9.37142 19.3714 )
Epeak [keV] : 31.3730 ( -89.0452 119.186 )
Norm@50keV : 77.3474 ( -77.3671 127.397 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.339494e-01
Photon flux (15-150 keV) in 1 sec: 1.77120 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34264e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.0839 (-2.75016 3.2771)
R^2/D10^2 : 0.168943 (-0.0812834 0.156904)
(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 9.026e-09 2.619e-09
25- 50 3.815e-08 8.220e-09
50-150 6.912e-08 1.974e-08
15-150 1.163e-07 2.606e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-81.737 -199.363)
Norm : 7.49890 (-1.10988 1.11161)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.867e-08 1.071e-08
25- 50 3.592e-08 2.029e-08
50-150 7.878e-08 4.460e-08
15-150 1.334e-07 7.515e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.17036 (-3.02616 4.91449)
R1^2/D10^2 : 1.51781 (-1.1861 9.27939)
kT2 [keV] : 23.9320 (-6.47063 33.5829)
R2^2/D10^2 : 3.26356E-02 (-0.0311529 0.0798891)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.617e-08 9.335e-09
25- 50 3.684e-08 1.978e-08
50-150 8.194e-08 4.478e-08
15-150 1.349e-07 7.110e-08
Plot creation:
Thu May 19 08:46:50 EDT 2022