batgrbproduct analysis for trigger=1154815
batgrbproduct Analysis for Trigger=1154815
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 Feb 17 15:38:11 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1154815/GCN5_download_cron
======================================================================
Trigger: 01154815 Segment: 000
BAT Trigger Time: 698251745.6 [s; MET]
Trigger Stop: 698251747.648 [s; MET]
UTC: 2023-02-16T14:48:34.830740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 113.966019310163 Dec: -8.01514618542377 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.91
Image Trigger?: NO
Rate S/N Ratio: 8.83176086632785 [ if not an image trigger ]
Image S/N Ratio: 7.91
Flight Position: [ source = BAT ]
RA: 113.966019310163 Dec: -8.01514618542377 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 113.966326090273 Dec: -7.99338536331834 [deg; J2000]
{ 07h 35m 51.9s , -07d 59' 36.2" }
+/- 2.12503839488415 [arcmin] (estimated 90% radius based on SNR)
+/- 1.01020432465023 [arcmin] (formal 1-sigma fit error)
SNR: 10.3621899633014
Angular difference between Flight and Ground position is 1.305777 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 91.1999999284744 +/- 7.31422286455825
Measured from: -78.8959999084473
to: 12.3040000200272 [s; relative to TRIGTIME]
T50: 55.6159999370575 +/- 28.9156788765114
Measured from: -55.0239999294281
to: 0.592000007629395 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.131999969482422
to: 0.868000030517578 [s; relative to TRIGTIME]
Total Fluence
Measured from: -81.0720000267029
to: 16.3999999761581 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.941843 0.904565 0.450158 0.043725
0.099530 0.102565 0.089783 0.085751 [error]
Peak 0.049528 0.074021 0.028989 0.000430
0.011285 0.011897 0.010028 0.009236 [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 2.59e-07 3.73e-07 3.99e-07 7.92e-07 1.28e-06 1.82e-06 erg/cm2
Error 4.42e-08 4.58e-08 8.49e-08 3.34e-07 1.96e-07 4.27e-07 erg/cm2
Peak flux Power-law 5.21e-01 4.12e-01 2.19e-01 1.69e-01 1.23e+00 1.32e+00 ph/cm2/s
Error 1.50e-01 8.91e-02 7.54e-02 1.09e-01 2.65e-01 2.93e-01 ph/cm2/s
Fluence Cutoff-PL 2.49e-07 3.98e-07 3.89e-07 3.15e-07 1.21e-06 1.35e-06 erg/cm2
Error 4.86e-08 6.24e-08 9.51e-08 3.97e-07 2.21e-07 5.79e-07 erg/cm2
Peak flux Cutoff-PL 4.79e-01 4.88e-01 2.05e-01 3.12e-02 1.20e+00 1.20e+00 ph/cm2/s
Error 1.65e-01 1.32e-01 1.04e-01 8.49e-02 2.65e-01 2.75e-01 ph/cm2/s
Fluence Band 2.47e-07 3.95e-07 3.92e-07 3.43e-07 1.21e-06 1.38e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 4.84e-01 4.75e-01 2.16e-01 -------- 1.21e+00 1.22e+00 ph/cm2/s
Error 1.63e-01 -------- -------- -------- 2.68e-01 2.73e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.904 0.230 - - 1.42e-03 2.21e-04 46.130 57
CPL 1.383 0.887 49.3 0.0 2.86e-03 0.00e+00 45.100 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.911 0.371 - - 8.53e-03 2.28e-03 63.110 57
CPL 0.553 2.217 42.0 60.1 5.63e-02 2.09e+00 60.930 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 97.472 -81.072 16.400
T90 91.200 -78.896 12.304
T50 55.616 -55.024 0.592
Peak 1.000 -0.132 0.868
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
113.9663 -7.9934 0.0186 15.9 89.8 2.5045 10.4 TRIG_01154815
------------------------------------------
Foreground time interval of the image:
-81.072 16.400 (delta_t = 97.472 [sec])
Background time interval of the image:
-239.600 -81.072 (delta_t = 158.528 [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 -81.072 sec. to 16.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90352 ( -0.22284 0.236416 )
Norm@50keV : 1.42449E-03 ( -0.000223666 0.000217801 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.13 using 59 PHA bins.
# Reduced chi-squared = 0.8093 for 57 degrees of freedom
# Null hypothesis probability = 8.479103e-01
Photon flux (15-150 keV) in 97.47 sec: 0.204734 ( -0.0248978 0.0248979 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27654e-06 ( -1.92733e-07 1.98499e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -81.072 sec. to 16.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38317 ( -1.04741 0.727242 )
Epeak [keV] : 49.3086 ( )
Norm@50keV : 2.85754E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.10 using 59 PHA bins.
# Reduced chi-squared = 0.8054 for 56 degrees of freedom
# Null hypothesis probability = 8.511329e-01
Photon flux (15-150 keV) in 97.47 sec: 0.200836 ( -0.025607 0.02566 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2052e-06 ( -2.12046e-07 2.29513e-07 ) ergs/cm2
Band function
Time interval is from -81.072 sec. to 16.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38314 ( 1.48526 1.06726 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 49.2916 ( -17.4932 -49.2916 )
Norm@50keV : 2.85744E-03 ( -0.00160552 0.00863423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.10 using 59 PHA bins.
# Reduced chi-squared = 0.8200 for 55 degrees of freedom
# Null hypothesis probability = 8.270590e-01
Photon flux (15-150 keV) in 97.47 sec: 0.201691 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21353e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5932 (-1.55799 1.79083)
R^2/D10^2 : 7.71395E-02 (-0.0341195 0.0628832)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.781236e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.748e-07 3.753e-08
25- 50 4.704e-07 7.432e-08
50-150 2.894e-07 8.884e-08
15-150 9.347e-07 1.754e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.3927 (-25.5442 50.4297)
Norm : 0.978445 (-0.168465 0.209769)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.467e-07 4.259e-08
25- 50 4.015e-07 5.687e-08
50-150 5.491e-07 2.878e-07
15-150 1.197e-06 3.257e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.46835 (-1.43126 1.90938)
R1^2/D10^2 : 1.28732 (-0.954081 4.10245)
kT2 [keV] : 15.9795 (-3.49943 6.38255)
R2^2/D10^2 : 1.32286E-02 (-0.00982061 0.0227013)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.584e-07 1.380e-07
25- 50 3.794e-07 1.869e-07
50-150 5.127e-07 3.056e-07
15-150 1.151e-06 5.985e-07
Peak spectrum fit
Power-law model
Time interval is from -0.132 sec. to 0.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91114 ( -0.35282 0.388771 )
Norm@50keV : 8.52699E-03 ( -0.00232041 0.00224952 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.11 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.692257e-01
Photon flux (15-150 keV) in 1 sec: 1.22954 ( -0.264824 0.264831 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84101e-08 ( -2.0222e-08 2.11598e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.132 sec. to 0.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.553415 ( -2.89717 1.53688 )
Epeak [keV] : 41.9582 ( -41.9464 78.3442 )
Norm@50keV : 5.62726E-02 ( -0.0564272 4.12307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.031940e-01
Photon flux (15-150 keV) in 1 sec: 1.19833 ( -0.264283 0.26569 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91976e-08 ( -1.99302e-08 2.32157e-08 ) ergs/cm2
Band function
Time interval is from -0.132 sec. to 0.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.32518 ( -7.76106 -3.31859 )
beta : -2.40697 ( 2.40551 0.659774 )
Epeak [keV] : 28.6491 ( -28.6512 191.651 )
Norm@50keV : 43.0472 ( -41.2622 297.265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.826723e-01
Photon flux (15-150 keV) in 1 sec: 1.21193 ( 5.78807 -0.280478 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.33618e-08 ( -7.33548e-08 -2.26375e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.55733 (-1.94346 2.62829)
R^2/D10^2 : 0.724639 (-0.441176 0.999621)
(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 1.325e-08 5.494e-09
25- 50 3.086e-08 1.051e-08
50-150 1.411e-08 7.773e-09
15-150 5.822e-08 2.044e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.7339 (-31.5346 92.2436)
Norm : 6.18650 (-1.73114 2.41242)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.587e-08 4.795e-09
25- 50 2.522e-08 8.700e-09
50-150 3.230e-08 2.279e-08
15-150 7.338e-08 3.235e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.83784 (-7.11971 3.42567)
R1^2/D10^2 : 1.79117 (-1.65582 -1.65582)
kT2 [keV] : 18.7701 (-20.5541 -20.5541)
R2^2/D10^2 : 2.88256E-02 (-0.021348 0.894088)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.513e-08 9.055e-09
25- 50 2.672e-08 1.524e-08
50-150 2.730e-08 1.901e-08
15-150 6.916e-08 3.844e-08
Plot creation:
Fri Feb 17 15:41:14 EST 2023