batgrbproduct analysis for trigger=1148770
batgrbproduct Analysis for Trigger=1148770
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): Sat Jan 14 04:19:17 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1148770/GCN5_download_cron
======================================================================
Trigger: 01148770 Segment: 000
BAT Trigger Time: 695262500.096 [s; MET]
Trigger Stop: 695262508.288 [s; MET]
UTC: 2023-01-13T00:27:49.530320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.51173377538 Dec: 35.0745596516468 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.78
Image Trigger?: NO
Rate S/N Ratio: 11.4455231422596 [ if not an image trigger ]
Image S/N Ratio: 8.78
Flight Position: [ source = BAT ]
RA: 299.51173377538 Dec: 35.0745596516468 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.514937900774 Dec: 35.060766801769 [deg; J2000]
{ 19h 58m 03.6s , +35d 03' 38.8" }
+/- 3.45846487302717 [arcmin] (estimated 90% radius based on SNR)
+/- 1.69600911315207 [arcmin] (formal 1-sigma fit error)
SNR: 5.16755366794669
Angular difference between Flight and Ground position is 0.842397 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 234.299999952316 +/- 253.780088041354
Measured from: 201.680000185966
to: 435.980000138283 [s; relative to TRIGTIME]
T50: 129.899999976158 +/- 297.382925102259
Measured from: 250.740000128746
to: 380.640000104904 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 117.59600007534
to: 118.59600007534 [s; relative to TRIGTIME]
Total Fluence
Measured from: -27.2400000095367
to: 470.432000041008 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.023742 2.786998 0.818427 0.007928
0.215090 0.226961 0.194353 0.164854 [error]
Peak 0.038440 0.035188 0.085087 0.014273
0.039971 0.048649 0.045580 0.032452 [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 1.03e-06 1.08e-06 8.04e-07 9.66e-07 3.29e-06 3.89e-06 erg/cm2
Error 1.19e-07 1.12e-07 1.60e-07 3.56e-07 3.80e-07 5.89e-07 erg/cm2
Peak flux Power-law 3.34e-01 2.62e-01 1.38e-01 1.05e-01 7.82e-01 8.39e-01 ph/cm2/s
Error 3.61e-01 2.21e-01 2.02e-01 3.04e+00 5.32e-01 1.32e+00 ph/cm2/s
Fluence Cutoff-PL 9.69e-07 1.28e-06 5.54e-07 5.34e-08 2.85e-06 2.86e-06 erg/cm2
Error 1.31e-07 1.58e-07 2.36e-07 1.24e-07 3.78e-07 3.98e-07 erg/cm2
Peak flux Cutoff-PL 3.45e-01 2.62e-01 1.35e-01 8.73e-02 7.81e-01 8.11e-01 ph/cm2/s
Error 3.60e-01 3.48e-01 -------- 1.22e+00 6.56e-01 1.45e+00 ph/cm2/s
Fluence Band 9.60e-07 1.28e-06 5.54e-07 5.40e-08 2.85e-06 2.85e-06 erg/cm2
Error 1.30e-07 1.57e-07 2.35e-07 -------- 3.75e-07 -------- erg/cm2
Peak flux Band 6.36e-01 4.34e-01 1.58e-01 4.14e-02 1.26e+00 1.27e+00 ph/cm2/s
Error 1.75e-01 -------- -------- 8.25e-02 1.92e-01 2.74e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.429 0.191 - - 6.75e-04 9.93e-05 51.820 57
CPL 0.591 1.257 26.5 8.2 1.03e-02 4.85e-02 41.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.926 0.265 - - 5.39e-03 5.37e-03 33.920 57
CPL 1.840 4.015 89.0 0.0 5.90e-03 0.00e+00 33.930 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 497.672 -27.240 470.432
T90 234.300 201.680 435.980
T50 129.900 250.740 380.640
Peak 1.000 117.596 118.596
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5149 +35.0608 0.0373 31.8 -15.1 0.9012 5.2 TRIG_01148770
------------------------------------------
Foreground time interval of the image:
-27.240 41.505 (delta_t = 68.745 [sec])
Background time interval of the image:
-239.096 -27.240 (delta_t = 211.856 [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
Multiple GTIs in the spectrum
tstart tstop
-27.240000 174.474000
175.904000 470.432000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42928 ( -0.184226 0.197718 )
Norm@50keV : 6.75222E-04 ( -9.9586e-05 9.90495e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9091 for 57 degrees of freedom
# Null hypothesis probability = 6.692375e-01
Photon flux (15-150 keV) in 496.2 sec: 0.127107 ( -0.0118545 0.0118545 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29059e-06 ( -3.75149e-07 3.85763e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-27.240000 174.474000
175.904000 470.432000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.590789 ( -1.45289 1.06049 )
Epeak [keV] : 26.5009 ( -11.4362 5.00048 )
Norm@50keV : 1.02666E-02 ( -0.0102676 0.0867553 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.05 using 59 PHA bins.
# Reduced chi-squared = 0.7330 for 56 degrees of freedom
# Null hypothesis probability = 9.329601e-01
Photon flux (15-150 keV) in 496.2 sec: 0.121892 ( -0.011927 0.011997 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85396e-06 ( -3.56664e-07 3.99585e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-27.240000 174.474000
175.904000 470.432000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.384893 ( -0.987505 0.663078 )
beta : -3.36395 ( 9.37167 19.3714 )
Epeak [keV] : 26.6991 ( -5.7617 5.13093 )
Norm@50keV : 5.21071E-02 ( -0.0506627 85.8886 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.43 using 59 PHA bins.
# Reduced chi-squared = 0.7350 for 55 degrees of freedom
# Null hypothesis probability = 9.292930e-01
Photon flux (15-150 keV) in 496.2 sec: 0.122100 ( 6.8779 -0.012165 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84991e-06 ( -2.84644e-06 -3.51726e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.43409 (-0.696592 0.768845)
R^2/D10^2 : 0.191003 (-0.0637827 0.0962891)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8208 for 57 degrees of freedom
# Null hypothesis probability = 8.307033e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.919e-07 1.404e-07
25- 50 1.369e-06 1.868e-07
50-150 2.806e-07 9.157e-08
15-150 2.541e-06 3.166e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.6015 (-6.58737 8.77596)
Norm : 0.941173 (-0.163825 0.206778)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.003e-06 1.109e-07
25- 50 1.216e-06 1.414e-07
50-150 7.690e-07 2.609e-07
15-150 2.988e-06 3.667e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.85938 (-2.27141 1.32386)
R1^2/D10^2 : 0.390065 (-0.191149 1.25784)
kT2 [keV] : 14.5785 (-10.7944 15.2427)
R2^2/D10^2 : 5.26017E-03 (-0.00505087 0.0412114)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.693e-07 4.390e-07
25- 50 1.258e-06 5.824e-07
50-150 7.112e-07 4.230e-07
15-150 2.939e-06 1.353e-06
Peak spectrum fit
Power-law model
Time interval is from 117.596 sec. to 118.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92609 ( -2.45588 -1.92655 )
Norm@50keV : 5.38514E-03 ( -0.00538379 0.00535961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.92 using 59 PHA bins.
# Reduced chi-squared = 0.5951 for 57 degrees of freedom
# Null hypothesis probability = 9.935372e-01
Photon flux (15-150 keV) in 1 sec: 0.781518 ( -0.532002 0.532772 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95173e-08 ( -4.43324e-08 8.79951e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 117.596 sec. to 118.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83977 ( -1.89053 6.14007 )
Epeak [keV] : 89.0316 ( )
Norm@50keV : 5.89947E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.93 using 59 PHA bins.
# Reduced chi-squared = 0.6058 for 56 degrees of freedom
# Null hypothesis probability = 9.913952e-01
Photon flux (15-150 keV) in 1 sec: 0.781051 ( -0.781051 0.531709 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86832e-08 ( -4.86832e-08 8.75268e-08 ) ergs/cm2
Band function
Time interval is from 117.596 sec. to 118.596 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43100 ( 1.46976 1.46976 )
beta : -1.83315 ( 1.91683 1.91683 )
Epeak [keV] : 20.4847 ( -15.0912 -15.0912 )
Norm@50keV : 1.36927E-02 ( -0.0151652 1.44596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.93 using 59 PHA bins.
# Reduced chi-squared = 0.6169 for 55 degrees of freedom
# Null hypothesis probability = 9.886655e-01
Photon flux (15-150 keV) in 1 sec: 1.25688 ( 5.74312 -0.12885 ) 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] : 7.97648 (-7.97648 -7.97648)
R^2/D10^2 : 0.849941 (-0.849938 -0.849938)
(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 9.757e-09 6.690e-09
25- 50 1.699e-08 1.286e-08
50-150 4.418e-09 4.216e-09
15-150 3.117e-08 2.398e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.5009 (-69.637 -69.637)
Norm : 3.72956 (-3.72612 172.511)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.561e-09 6.640e-09
25- 50 1.518e-08 1.109e-08
50-150 1.940e-08 1.697e-08
15-150 4.414e-08 3.464e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.19149 (-1.34076 9.2164)
R1^2/D10^2 : 2.80168E+05 (-279295 4.399e+07)
kT2 [keV] : 20.5615 (-15.9515 -20.6598)
R2^2/D10^2 : 2.56463E-02 (-0.0252377 0.419735)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.142e-08 6.620e-09
25- 50 9.910e-09 5.830e-09
50-150 3.713e-08 2.948e-08
15-150 5.846e-08 3.744e-08
Plot creation:
Sat Jan 14 04:23:42 EST 2023