batgrbproduct analysis for trigger=1107466
batgrbproduct Analysis for Trigger=1107466
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 May 22 11:00:44 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1107466/batgroup_hand_proc
======================================================================
Trigger: 01107466 Segment: 000
BAT Trigger Time: 674868050.624 [s; MET]
Trigger Stop: 674868050.88 [s; MET]
UTC: 2022-05-21T23:20:21.443840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 275.196625064596 Dec: 10.3843128192865 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.92
Image Trigger?: NO
Rate S/N Ratio: 21.6333076527839 [ if not an image trigger ]
Image S/N Ratio: 9.92
Flight Position: [ source = BAT ]
RA: 275.196625064596 Dec: 10.3843128192865 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 275.217901368988 Dec: 10.3722172639446 [deg; J2000]
{ 18h 20m 52.3s , +10d 22' 20.0" }
+/- 1.66376493457738 [arcmin] (estimated 90% radius based on SNR)
+/- 0.519184009420098 [arcmin] (formal 1-sigma fit error)
SNR: 14.6984897206395
Angular difference between Flight and Ground position is 1.450329 arcmin
Partial Coding Fraction: 0.4609375 [ including projection effects ]
Duration
T90: 13.5479999780655 +/- 2.69150143247832
Measured from: -0.059999942779541
to: 13.4880000352859 [s; relative to TRIGTIME]
T50: 9.03199994564056 +/- 3.11905428149317
Measured from: 0.388000011444092
to: 9.41999995708466 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.179999947547913
to: 0.820000052452087 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.227999925613403
to: 16.1680001020432 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.541003 0.558335 0.320867 0.039333
0.057617 0.045100 0.036269 0.030142 [error]
Peak 0.182096 0.216528 0.138646 0.027665
0.016895 0.015244 0.012438 0.007919 [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 1.73e-07 2.40e-07 2.46e-07 4.59e-07 8.05e-07 1.12e-06 erg/cm2
Error 2.60e-08 2.24e-08 3.53e-08 1.37e-07 8.19e-08 1.69e-07 erg/cm2
Peak flux Power-law 1.98e+00 1.58e+00 8.49e-01 6.66e-01 4.71e+00 5.08e+00 ph/cm2/s
Error 2.53e-01 1.31e-01 9.57e-02 1.46e-01 3.96e-01 4.11e-01 ph/cm2/s
Fluence Cutoff-PL 1.57e-07 2.55e-07 2.48e-07 1.83e-07 7.62e-07 8.42e-07 erg/cm2
Error 3.19e-08 2.85e-08 3.87e-08 2.18e-07 9.32e-08 2.54e-07 erg/cm2
Peak flux Cutoff-PL 1.78e+00 1.70e+00 8.86e-01 3.21e-01 4.58e+00 4.68e+00 ph/cm2/s
Error 3.03e-01 1.66e-01 1.09e-01 2.12e-01 4.12e-01 4.66e-01 ph/cm2/s
Fluence Band 1.54e-07 2.55e-07 2.45e-07 2.52e-07 7.63e-07 9.10e-07 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 1.965 0.177 - - 5.33e-03 5.58e-04 54.250 57
CPL 1.304 0.811 48.8 0.0 1.19e-02 0.00e+00 51.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.895 0.140 - - 3.29e-02 2.90e-03 74.830 57
CPL 1.193 0.642 54.3 26.8 7.75e-02 6.94e-02 70.710 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: 1.408000 sec.
T50 in the 50-300 keV band: 0.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.396 -0.228 16.168
T90 13.548 -0.060 13.488
T50 9.032 0.388 9.420
Peak 1.000 -0.180 0.820
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
275.2179 +10.3722 0.0132 29.5 -78.5 1.0659 14.7 TRIG_01107466
------------------------------------------
Foreground time interval of the image:
-0.228 9.477 (delta_t = 9.705 [sec])
Background time interval of the image:
-239.624 -0.228 (delta_t = 239.396 [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 -0.228 sec. to 16.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96546 ( -0.174046 0.180013 )
Norm@50keV : 5.32897E-03 ( -0.000562698 0.000554041 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.25 using 59 PHA bins.
# Reduced chi-squared = 0.9518 for 57 degrees of freedom
# Null hypothesis probability = 5.787739e-01
Photon flux (15-150 keV) in 16.4 sec: 0.786916 ( -0.0764946 0.0768391 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.04691e-07 ( -8.1475e-08 8.22936e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.228 sec. to 16.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30382 ( -0.884025 0.737187 )
Epeak [keV] : 48.8424 ( )
Norm@50keV : 1.19128E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.96 using 59 PHA bins.
# Reduced chi-squared = 0.9279 for 56 degrees of freedom
# Null hypothesis probability = 6.284502e-01
Photon flux (15-150 keV) in 16.4 sec: 0.756206 ( -0.083837 0.083886 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62118e-07 ( -9.18351e-08 9.44952e-08 ) ergs/cm2
Band function
Time interval is from -0.228 sec. to 16.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33119 ( -3.27724 0.904595 )
beta : -8.85912 ( 2.73791 12.7379 )
Epeak [keV] : 48.9476 ( -48.8299 -48.8299 )
Norm@50keV : 1.15257E-02 ( -0.00585564 20.1963 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.96 using 59 PHA bins.
# Reduced chi-squared = 0.9448 for 55 degrees of freedom
# Null hypothesis probability = 5.913347e-01
Photon flux (15-150 keV) in 16.4 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62682e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0181 (-1.23649 1.36821)
R^2/D10^2 : 0.177335 (-0.060118 0.0916773)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.87 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 57 degrees of freedom
# Null hypothesis probability = 1.024521e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.886e-08 1.599e-08
25- 50 2.801e-07 3.387e-08
50-150 2.435e-07 4.945e-08
15-150 6.125e-07 6.781e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.9849 (-19.3271 31.4547)
Norm : 3.68608 (-0.534533 0.64571)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.564e-07 2.016e-08
25- 50 2.551e-07 2.517e-08
50-150 3.508e-07 1.285e-07
15-150 7.624e-07 9.938e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.95804 (-1.3256 1.75824)
R1^2/D10^2 : 8.27409 (-6.62631 67.8244)
kT2 [keV] : 15.1838 (-2.20144 3.28457)
R2^2/D10^2 : 6.33113E-02 (-0.0359924 0.0716614)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.672e-07 7.931e-08
25- 50 2.420e-07 8.364e-08
50-150 3.175e-07 9.947e-08
15-150 7.267e-07 1.763e-07
Peak spectrum fit
Power-law model
Time interval is from -0.180 sec. to 0.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89505 ( -0.137692 0.141641 )
Norm@50keV : 3.28924E-02 ( -0.00291629 0.00288603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.83 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 57 degrees of freedom
# Null hypothesis probability = 5.671829e-02
Photon flux (15-150 keV) in 1 sec: 4.71052 ( -0.395822 0.396671 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02391e-07 ( -2.64774e-08 2.66138e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.180 sec. to 0.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19267 ( -0.687778 0.595584 )
Epeak [keV] : 54.2667 ( -11.3086 42.3402 )
Norm@50keV : 7.75068E-02 ( -0.0394215 0.0994483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.71 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 56 degrees of freedom
# Null hypothesis probability = 8.921173e-02
Photon flux (15-150 keV) in 1 sec: 4.57982 ( -0.41141 0.4117 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89806e-07 ( -2.8654e-08 2.8798e-08 ) ergs/cm2
Band function
Time interval is from -0.180 sec. to 0.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10831 ( -0.626599 1.10821 )
beta : -2.55529 ( 2.52209 0.601194 )
Epeak [keV] : 52.3159 ( -26.9094 29.5908 )
Norm@50keV : 8.68088E-02 ( -0.0289209 2419.97 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.21 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 55 degrees of freedom
# Null hypothesis probability = 8.124050e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90083e-07 ( -2.90076e-07 -2.7856e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2228 (-1.1156 1.20602)
R^2/D10^2 : 1.05059 (-0.31574 0.456489)
(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 3.324e-08 4.955e-09
25- 50 1.069e-07 1.112e-08
50-150 9.718e-08 1.840e-08
15-150 2.373e-07 2.310e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.0412 (-19.4618 29.4708)
Norm : 21.5905 (-2.54955 2.9301)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.627e-08 6.665e-09
25- 50 9.447e-08 8.065e-09
50-150 1.409e-07 4.865e-08
15-150 2.916e-07 4.935e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.41602 (-1.4334 2.02914)
R1^2/D10^2 : 12.9591 (-8.58117 22.1583)
kT2 [keV] : 17.5077 (-2.87725 5.86079)
R2^2/D10^2 : 0.210568 (-0.151434 0.246813)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.597e-08 2.538e-08
25- 50 9.300e-08 3.090e-08
50-150 1.323e-07 4.790e-08
15-150 2.813e-07 8.585e-08
Plot creation:
Sun May 22 11:05:56 EDT 2022