batgrbproduct analysis for trigger=1222955
batgrbproduct Analysis for Trigger=1222955
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 19 21:09:21 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1222955/GCN5_download_cron
======================================================================
Trigger: 01222955 Segment: 000
BAT Trigger Time: 735184114.432 [s; MET]
Trigger Stop: 735184118.528 [s; MET]
UTC: 2024-04-19T01:48:01.136900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 94.567774527607 Dec: -45.0114988670489 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.72
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 6.72
Flight Position: [ source = BAT ]
RA: 94.567774527607 Dec: -45.0114988670489 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 94.5053409800521 Dec: -44.9639379860941 [deg; J2000]
{ 06h 18m 01.3s , -44d 57' 50.2" }
+/- 2.97332788905193 [arcmin] (estimated 90% radius based on SNR)
+/- 1.93103209067324 [arcmin] (formal 1-sigma fit error)
SNR: 6.41294079939151
Angular difference between Flight and Ground position is 3.893924 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 3 +/- 1.4142135623731
Measured from: -0.431999921798706
to: 2.56800007820129 [s; relative to TRIGTIME]
T50: 1 +/- 1
Measured from: 0.568000078201294
to: 1.56800007820129 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.567999958992004
to: 1.567999958992 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.432000041007996
to: 2.567999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.055298 0.053262 0.041817 -0.004811
0.010800 0.011189 0.009504 0.008151 [error]
Peak 0.029083 0.024126 0.025919 0.001095
0.006294 0.006596 0.005838 0.004956 [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 1.41e-08 2.28e-08 2.79e-08 6.69e-08 8.39e-08 1.32e-07 erg/cm2
Error 4.25e-09 4.65e-09 9.05e-09 4.49e-08 2.12e-08 5.38e-08 erg/cm2
Peak flux Power-law 2.14e-01 2.14e-01 1.50e-01 1.67e-01 6.43e-01 7.44e-01 ph/cm2/s
Error 7.95e-02 4.96e-02 4.80e-02 1.10e-01 1.45e-01 1.78e-01 ph/cm2/s
Fluence Cutoff-PL 1.39e-08 2.33e-08 2.80e-08 5.12e-08 8.27e-08 1.16e-07 erg/cm2
Error 4.58e-09 5.58e-09 9.45e-09 5.73e-08 2.25e-08 6.35e-08 erg/cm2
Peak flux Cutoff-PL 2.17e-01 2.14e-01 1.48e-01 1.61e-01 6.44e-01 7.42e-01 ph/cm2/s
Error 7.91e-02 5.13e-02 4.89e-02 1.22e-01 1.45e-01 1.87e-01 ph/cm2/s
Fluence Band 1.36e-08 2.34e-08 2.81e-08 4.61e-08 8.24e-08 1.12e-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 1.711 0.378 - - 3.02e-03 7.23e-04 49.830 57
CPL 1.575 1.221 127.3 0.0 3.58e-03 0.00e+00 49.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.511 0.424 - - 5.14e-03 1.26e-03 58.330 57
CPL 1.505 0.739 9999.1 0.0 5.15e-03 8.34e-03 58.340 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 3.000 -0.432 2.568
T90 3.000 -0.432 2.568
T50 1.000 0.568 1.568
Peak 1.000 0.568 1.568
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
94.5053 -44.9639 0.0301 11.7 65.6 0.1340 6.4 TRIG_01222955
------------------------------------------
Foreground time interval of the image:
-0.432 2.568 (delta_t = 3.000 [sec])
Background time interval of the image:
-60.432 -0.432 (delta_t = 60.000 [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 -0.432 sec. to 2.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71146 ( -0.362739 0.392419 )
Norm@50keV : 3.02152E-03 ( -0.000739494 0.000707256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.83 using 59 PHA bins.
# Reduced chi-squared = 0.8742 for 57 degrees of freedom
# Null hypothesis probability = 7.385361e-01
Photon flux (15-150 keV) in 3 sec: 0.402911 ( -0.0821289 0.082135 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38536e-08 ( -2.082e-08 2.1574e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.432 sec. to 2.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57493 ( -1.52418 0.918319 )
Epeak [keV] : 127.254 ( )
Norm@50keV : 3.57675E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.8891 for 56 degrees of freedom
# Null hypothesis probability = 7.076396e-01
Photon flux (15-150 keV) in 3 sec: 0.400989 ( -0.082098 0.083331 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27478e-08 ( -2.24826e-08 2.2428e-08 ) ergs/cm2
Band function
Time interval is from -0.432 sec. to 2.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.433140 ( -0.452924 -0.452924 )
beta : -1.77003 ( 1.77159 0.413266 )
Epeak [keV] : 26.4034 ( -26.145 324.382 )
Norm@50keV : 0.139707 ( -0.163648 373.834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.70 using 59 PHA bins.
# Reduced chi-squared = 0.9036 for 55 degrees of freedom
# Null hypothesis probability = 6.767833e-01
Photon flux (15-150 keV) in 3 sec: 0.399468 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24175e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3162 (-3.39133 4.42492)
R^2/D10^2 : 8.84411E-02 (-0.0585765 0.192709)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.70 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.491688e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.527e-09 4.059e-09
25- 50 2.766e-08 1.296e-08
50-150 2.566e-08 1.308e-08
15-150 6.184e-08 2.300e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 131.324 (-72.9846 -129.22)
Norm : 1.68543 (-0.379461 0.570449)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.311e-08 7.452e-09
25- 50 2.381e-08 1.344e-08
50-150 4.436e-08 2.919e-08
15-150 8.128e-08 4.891e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.04776 (-2.1259 3.2294)
R1^2/D10^2 : 1.61742 (-1.35252 16.9324)
kT2 [keV] : 21.3902 (-7.44875 22.9216)
R2^2/D10^2 : 9.88256E-03 (-0.00900363 0.0446418)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.480e-08 8.408e-09
25- 50 2.141e-08 1.100e-08
50-150 4.548e-08 2.823e-08
15-150 8.169e-08 4.503e-08
Peak spectrum fit
Power-law model
Time interval is from 0.568 sec. to 1.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51143 ( -0.412549 0.435336 )
Norm@50keV : 5.13746E-03 ( -0.00128927 0.00123624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.33 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.260746e-01
Photon flux (15-150 keV) in 1 sec: 0.643347 ( -0.144964 0.145029 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86464e-08 ( -1.31915e-08 1.35833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.568 sec. to 1.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50537 ( -1.03757 0.439523 )
Epeak [keV] : 9999.13 ( -9999.35 -9999.35 )
Norm@50keV : 5.15221E-03 ( -0.00129996 0.0153802 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.34 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 56 degrees of freedom
# Null hypothesis probability = 3.895043e-01
Photon flux (15-150 keV) in 1 sec: 0.643589 ( -0.145509 0.144663 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83749e-08 ( -1.31096e-08 1.37202e-08 ) ergs/cm2
Band function
Time interval is from 0.568 sec. to 1.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.75422 ( 1.64499 2.75422 )
beta : -1.51143 ( -0.435357 0.41255 )
Epeak [keV] : 122.861 ( -122.861 -122.861 )
Norm@50keV : 0.698253 ( -0.17523 0.168024 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.33 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.538259e-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] : 16.1597 (-5.63494 7.84415)
R^2/D10^2 : 5.49226E-02 (-0.0393263 0.180049)
(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 2.959e-09 1.473e-09
25- 50 1.256e-08 6.465e-09
50-150 2.300e-08 1.274e-08
15-150 3.852e-08 1.827e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-121.008 -199.363)
Norm : 2.61886 (-0.590616 0.591027)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.521e-09 3.872e-09
25- 50 1.254e-08 7.405e-09
50-150 2.751e-08 1.632e-08
15-150 4.658e-08 2.733e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.00991 (-1.84606 2.56832)
R1^2/D10^2 : 2.69905 (-2.26555 18.9571)
kT2 [keV] : 27.7260 (-9.81611 26.9141)
R2^2/D10^2 : 7.82552E-03 (-0.00670825 0.0253709)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.603e-09 4.501e-09
25- 50 1.023e-08 5.445e-09
50-150 3.298e-08 2.094e-08
15-150 5.081e-08 2.779e-08
Plot creation:
Fri Apr 19 21:11:41 EDT 2024