batgrbproduct analysis for trigger=1164980
batgrbproduct Analysis for Trigger=1164980
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): Fri Apr 21 15:11:12 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1164980/GCN5_download_cron
======================================================================
Trigger: 01164980 Segment: 000
BAT Trigger Time: 703678772.224 [s; MET]
Trigger Stop: 703678776.32 [s; MET]
UTC: 2023-04-20T10:19:01.085100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 161.013191653554 Dec: 32.0865774853194 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.98
Image Trigger?: NO
Rate S/N Ratio: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 7.98
Flight Position: [ source = BAT ]
RA: 161.013191653554 Dec: 32.0865774853194 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 161.039627493552 Dec: 32.1105610784097 [deg; J2000]
{ 10h 44m 09.5s , +32d 06' 38.0" }
+/- 1.45334354431516 [arcmin] (estimated 90% radius based on SNR)
+/- 0.667918016555651 [arcmin] (formal 1-sigma fit error)
SNR: 17.8305067395277
Angular difference between Flight and Ground position is 1.968820 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 111.751999974251 +/- 12.0231019608135
Measured from: -23.0919998884201
to: 88.6600000858307 [s; relative to TRIGTIME]
T50: 55.944000005722 +/- 6.81692021712467
Measured from: 3.98400008678436
to: 59.9280000925064 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.41200006008148
to: 2.41200006008148 [s; relative to TRIGTIME]
Total Fluence
Measured from: -34.7519999742508
to: 100.804000020027 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.453857 2.041744 1.215425 0.210147
0.092761 0.095852 0.082891 0.070145 [error]
Peak 0.033846 0.046683 0.042877 0.004095
0.008473 0.008732 0.007992 0.006238 [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 4.47e-07 7.54e-07 9.67e-07 2.49e-06 2.86e-06 4.66e-06 erg/cm2
Error 4.16e-08 4.39e-08 7.95e-08 4.28e-07 1.88e-07 4.96e-07 erg/cm2
Peak flux Power-law 2.88e-01 3.14e-01 2.43e-01 3.09e-01 9.61e-01 1.15e+00 ph/cm2/s
Error 9.28e-02 6.63e-02 5.90e-02 1.47e-01 1.92e-01 2.40e-01 ph/cm2/s
Fluence Cutoff-PL 4.09e-07 8.12e-07 9.75e-07 9.00e-07 2.67e-06 3.10e-06 erg/cm2
Error 4.82e-08 5.74e-08 8.81e-08 -------- 2.19e-07 6.08e-07 erg/cm2
Peak flux Cutoff-PL 1.63e-01 3.61e-01 3.01e-01 6.56e-02 8.80e-01 8.90e-01 ph/cm2/s
Error 1.47e-01 8.77e-02 8.11e-02 9.60e-02 2.09e-01 2.25e-01 ph/cm2/s
Fluence Band 3.85e-07 8.43e-07 9.23e-07 1.75e-06 2.71e-06 3.90e-06 erg/cm2
Error 5.28e-08 6.46e-08 8.73e-08 5.34e-07 2.02e-07 5.83e-07 erg/cm2
Peak flux Band 1.70e-01 3.60e-01 2.99e-01 6.81e-02 8.88e-01 8.99e-01 ph/cm2/s
Error 1.47e-01 8.22e-02 7.41e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.641 0.102 - - 2.26e-03 1.39e-04 61.020 57
CPL 0.962 0.457 70.5 28.1 5.22e-03 3.15e-03 53.290 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.368 0.312 - - 7.95e-03 1.61e-03 58.350 57
CPL -1.054 2.653 67.5 28.0 1.08e-01 1.66e+00 52.370 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: 96.192000 sec.
T50 in the 50-300 keV band: 60.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 135.556 -34.752 100.804
T90 111.752 -23.092 88.660
T50 55.944 3.984 59.928
Peak 1.000 1.412 2.412
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
161.0396 +32.1106 0.0108 10.5 -162.7 2.5068 17.8 TRIG_01164980
------------------------------------------
Foreground time interval of the image:
-34.752 35.677 (delta_t = 70.429 [sec])
Background time interval of the image:
-239.224 -188.624 (delta_t = 50.600 [sec])
-187.224 -34.752 (delta_t = 152.472 [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 -34.752 sec. to 100.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64146 ( -0.101412 0.102543 )
Norm@50keV : 2.26289E-03 ( -0.000139239 0.000138404 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.02 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.336755e-01
Photon flux (15-150 keV) in 135.6 sec: 0.294652 ( -0.0171132 0.0171271 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85629e-06 ( -1.87531e-07 1.89106e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -34.752 sec. to 100.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.961772 ( -0.483581 0.430403 )
Epeak [keV] : 70.5325 ( -13.2331 42.9156 )
Norm@50keV : 5.22439E-03 ( -0.00211197 0.00419186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.29 using 59 PHA bins.
# Reduced chi-squared = 0.9516 for 56 degrees of freedom
# Null hypothesis probability = 5.780394e-01
Photon flux (15-150 keV) in 135.6 sec: 0.285050 ( -0.018099 0.018093 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67215e-06 ( -2.17394e-07 2.19943e-07 ) ergs/cm2
Band function
Time interval is from -34.752 sec. to 100.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.964962 ( -0.384509 0.307973 )
beta : -9.35774 ( 9.37126 19.3713 )
Epeak [keV] : 70.6965 ( -11.0839 41.7233 )
Norm@50keV : 5.20138E-03 ( -0.00191425 0.000708817 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.29 using 59 PHA bins.
# Reduced chi-squared = 0.9689 for 55 degrees of freedom
# Null hypothesis probability = 5.401599e-01
Photon flux (15-150 keV) in 135.6 sec: 0.285051 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71378e-06 ( -2.71283e-06 -2.02478e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6302 (-0.871227 0.954441)
R^2/D10^2 : 5.98096E-02 (-0.0139725 0.0178979)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.26 using 59 PHA bins.
# Reduced chi-squared = 1.724 for 57 degrees of freedom
# Null hypothesis probability = 5.648616e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.744e-07 2.848e-08
25- 50 9.155e-07 6.414e-08
50-150 9.075e-07 1.166e-07
15-150 2.097e-06 1.410e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 145.840 (-35.7976 51.6101)
Norm : 1.21957 (-0.0799774 0.0963168)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.257e-07 3.553e-08
25- 50 7.859e-07 9.126e-08
50-150 1.533e-06 5.222e-07
15-150 2.745e-06 6.149e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.99449 (-1.33138 1.3393)
R1^2/D10^2 : 0.216967 (-0.0807192 0.158876)
kT2 [keV] : 26.7725 (-6.09269 12.0093)
R2^2/D10^2 : 2.67214E-03 (-0.00192348 0.00335287)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.833e-07 7.573e-08
25- 50 8.490e-07 1.664e-07
50-150 1.493e-06 6.686e-07
15-150 2.726e-06 8.124e-07
Peak spectrum fit
Power-law model
Time interval is from 1.412 sec. to 2.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36840 ( -0.308256 0.316641 )
Norm@50keV : 7.94938E-03 ( -0.00161168 0.00160295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.35 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.255650e-01
Photon flux (15-150 keV) in 1 sec: 0.961381 ( -0.192288 0.192569 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.73221e-08 ( -1.71666e-08 1.74912e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.412 sec. to 2.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.05351 ( -3.48295 1.82307 )
Epeak [keV] : 67.5046 ( -13.0741 42.9703 )
Norm@50keV : 0.107875 ( -0.111554 3.21373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9351 for 56 degrees of freedom
# Null hypothesis probability = 6.132509e-01
Photon flux (15-150 keV) in 1 sec: 0.879725 ( -0.211562 0.206615 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01844e-08 ( -1.69948e-08 1.81531e-08 ) ergs/cm2
Band function
Time interval is from 1.412 sec. to 2.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.07614 ( -1.31131 4.40837 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 67.3702 ( -13.0699 42.9974 )
Norm@50keV : 0.110475 ( -0.110472 3.14427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9521 for 55 degrees of freedom
# Null hypothesis probability = 5.759312e-01
Photon flux (15-150 keV) in 1 sec: 0.887938 ( ) 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] : 16.8657 (-2.90791 3.64143)
R^2/D10^2 : 8.27383E-02 (-0.0407556 0.0745197)
(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 4.803e-09 1.699e-09
25- 50 2.112e-08 6.605e-09
50-150 4.278e-08 1.898e-08
15-150 6.870e-08 2.032e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-89.9537 -199.363)
Norm : 3.98769 (-0.787784 0.787782)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.930e-09 5.745e-09
25- 50 1.910e-08 1.107e-08
50-150 4.189e-08 2.419e-08
15-150 7.092e-08 4.052e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.43766 (-2.45714 24.8181)
R1^2/D10^2 : 62.4761 (-56.7564 -56.7564)
kT2 [keV] : 17.7636 (-3.23925 4.36087)
R2^2/D10^2 : 6.71141E-02 (-0.066545 0.0391056)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.105e-09 2.940e-09
25- 50 1.969e-08 9.545e-09
50-150 4.450e-08 1.916e-08
15-150 7.129e-08 2.460e-08
Plot creation:
Fri Apr 21 15:14:26 EDT 2023