batgrbproduct analysis for trigger=1167973
batgrbproduct Analysis for Trigger=1167973
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 25 17:46:05 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1167973/GCN5_download_cron
======================================================================
Trigger: 01167973 Segment: 000
BAT Trigger Time: 705413219.84 [s; MET]
Trigger Stop: 705413220.864 [s; MET]
UTC: 2023-05-10T12:06:28.582740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 318.155739208481 Dec: 34.4426846404614 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.66
Image Trigger?: NO
Rate S/N Ratio: 21.7485631709315 [ if not an image trigger ]
Image S/N Ratio: 10.66
Flight Position: [ source = BAT ]
RA: 318.155739208481 Dec: 34.4426846404614 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 318.138137691734 Dec: 34.4304861264883 [deg; J2000]
{ 21h 12m 33.2s , +34d 25' 49.8" }
+/- 0.912963783871801 [arcmin] (estimated 90% radius based on SNR)
+/- 0.256121211945198 [arcmin] (formal 1-sigma fit error)
SNR: 34.6428256897545
Angular difference between Flight and Ground position is 1.137699 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 178.431999921799 +/- 6.93123251560823
Measured from: -138.975999951363
to: 39.4559999704361 [s; relative to TRIGTIME]
T50: 22.5919998884201 +/- 5.57645340801987
Measured from: -1.37599992752075
to: 21.2159999608994 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.3880000114441
to: 14.3880000114441 [s; relative to TRIGTIME]
Total Fluence
Measured from: -145.632000088692
to: 56.8639999628067 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.074018 6.232830 4.978392 1.197128
0.269986 0.281139 0.241575 0.198129 [error]
Peak 0.196291 0.287982 0.238794 0.062710
0.013261 0.014705 0.013745 0.008998 [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 1.56e-06 2.69e-06 3.56e-06 9.58e-06 1.04e-05 1.74e-05 erg/cm2
Error 1.38e-07 1.37e-07 2.40e-07 1.44e-06 5.61e-07 1.61e-06 erg/cm2
Peak flux Power-law 1.66e+00 1.90e+00 1.55e+00 2.13e+00 5.89e+00 7.24e+00 ph/cm2/s
Error 1.75e-01 1.21e-01 1.07e-01 3.09e-01 3.40e-01 4.33e-01 ph/cm2/s
Fluence Cutoff-PL 1.56e-06 2.70e-06 3.56e-06 9.48e-06 1.04e-05 1.73e-05 erg/cm2
Error 1.40e-07 1.34e-07 2.39e-07 1.81e-06 5.52e-07 2.28e-06 erg/cm2
Peak flux Cutoff-PL 1.60e+00 1.93e+00 1.58e+00 1.73e+00 5.84e+00 6.84e+00 ph/cm2/s
Error 2.09e-01 1.35e-01 1.21e-01 6.16e-01 3.46e-01 7.16e-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 1.598 0.094 - - 5.49e-03 2.73e-04 68.420 57
CPL 1.599 0.100 9999.3 0.0 5.48e-03 1.31e-03 68.460 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.289 0.099 - - 4.94e-02 2.81e-03 48.770 57
CPL 1.106 0.308 261.2 0.0 6.05e-02 2.21e-02 48.010 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: 45.312000 sec.
T50 in the 50-300 keV band: 15.040000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 202.496 -145.632 56.864
T90 178.432 -138.976 39.456
T50 22.592 -1.376 21.216
Peak 1.000 13.388 14.388
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
318.1381 +34.4305 0.0055 8.6 -17.2 5.5834 34.6 TRIG_01167973
------------------------------------------
Foreground time interval of the image:
-33.339 10.061 (delta_t = 43.400 [sec])
Background time interval of the image:
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 -145.632 sec. to 56.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59809 ( -0.0938626 0.0946986 )
Norm@50keV : 5.49241E-03 ( -0.000273433 0.000272346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.42 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.429163e-01
Photon flux (15-150 keV) in 202.5 sec: 0.705382 ( -0.0353858 0.0355509 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0404e-05 ( -5.59769e-07 5.62986e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -145.632 sec. to 56.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59924 ( -0.105888 0.0932119 )
Epeak [keV] : 9999.28 ( -9999.35 -9999.35 )
Norm@50keV : 5.48370E-03 ( -0.00103053 0.00158341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.46 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 56 degrees of freedom
# Null hypothesis probability = 1.227156e-01
Photon flux (15-150 keV) in 202.5 sec: 0.705394 ( -0.035755 0.03518 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03994e-05 ( -5.49058e-07 5.5485e-07 ) ergs/cm2
Band function
Time interval is from -145.632 sec. to 56.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30812 ( 1.30812 1.30812 )
beta : -1.59808 ( -0.0948896 0.0939117 )
Epeak [keV] : 29.0341 ( -29.0341 -29.0341 )
Norm@50keV : 1.10576E-02 ( -0.00449792 5.863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.42 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.054867e-01
Photon flux (15-150 keV) in 202.5 sec: ( ) 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] : 15.1036 ( )
R^2/D10^2 : 7.28967E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 188.51 using 59 PHA bins.
# Reduced chi-squared = 3.3072 for 57 degrees of freedom
# Null hypothesis probability = 5.596238e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.042e-07 7.189e-08
25- 50 2.816e-06 1.650e-07
50-150 4.385e-06 4.253e-07
15-150 7.905e-06 4.789e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.024 (-50.5183 -199.024)
Norm : 2.82767 (-0.13572 0.156065)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.426e-06 8.292e-08
25- 50 2.743e-06 2.045e-07
50-150 6.012e-06 1.321e-06
15-150 1.018e-05 1.621e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.93316 (-0.731535 0.897474)
R1^2/D10^2 : 2.96356 (-1.4876 3.15872)
kT2 [keV] : 22.3577 (-2.34617 3.09984)
R2^2/D10^2 : 1.60399E-02 (-0.00595788 0.00789937)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.681e-06 3.636e-07
25- 50 2.465e-06 2.653e-07
50-150 5.980e-06 7.017e-07
15-150 1.013e-05 1.080e-06
Peak spectrum fit
Power-law model
Time interval is from 13.388 sec. to 14.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28854 ( -0.0993713 0.0994942 )
Norm@50keV : 4.94481E-02 ( -0.00281301 0.00280968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.77 using 59 PHA bins.
# Reduced chi-squared = 0.8556 for 57 degrees of freedom
# Null hypothesis probability = 7.728420e-01
Photon flux (15-150 keV) in 1 sec: 5.88700 ( -0.339558 0.339817 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90019e-07 ( -3.14518e-08 3.16012e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.388 sec. to 14.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10649 ( -0.383558 0.232292 )
Epeak [keV] : 261.230 ( -261.236 -261.236 )
Norm@50keV : 6.05283E-02 ( -0.0132577 0.0309113 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.01 using 59 PHA bins.
# Reduced chi-squared = 0.8574 for 56 degrees of freedom
# Null hypothesis probability = 7.673460e-01
Photon flux (15-150 keV) in 1 sec: 5.84188 ( -0.34261 0.35026 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84711e-07 ( -3.3692e-08 3.3452e-08 ) ergs/cm2
Band function
Time interval is from 13.388 sec. to 14.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.911888 ( -1.58597 -1.58597 )
beta : -1.35189 ( 1.34957 0.128958 )
Epeak [keV] : 35.9287 ( -32.3003 252.395 )
Norm@50keV : 1.81013 ( -1.79434 1622.09 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.01 using 59 PHA bins.
# Reduced chi-squared = 0.8547 for 55 degrees of freedom
# Null hypothesis probability = 7.696958e-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] : 17.4208 ( )
R^2/D10^2 : 0.415032 ( )
(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 2.547e-08 2.840e-09
25- 50 1.149e-07 8.400e-09
50-150 2.509e-07 2.785e-08
15-150 3.912e-07 2.755e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.2446 -200)
Norm : 24.2367 (-1.38504 1.38504)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.035e-08 3.890e-09
25- 50 1.161e-07 6.850e-09
50-150 2.546e-07 5.030e-08
15-150 4.310e-07 6.430e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.02728 (-1.3972 1.57414)
R1^2/D10^2 : 3.50404 (-1.47653 2.99832)
kT2 [keV] : 32.8393 (-5.91216 10.562)
R2^2/D10^2 : 4.15427E-02 (-0.024209 0.0398609)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.755e-08 9.585e-09
25- 50 1.144e-07 2.124e-08
50-150 3.284e-07 1.071e-07
15-150 4.903e-07 1.193e-07
Plot creation:
Thu May 25 17:55:23 EDT 2023