batgrbproduct analysis for trigger=1061482
batgrbproduct Analysis for Trigger=1061482
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): Sun Jul 25 18:11:25 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1061482/GCN5_download_cron
======================================================================
Trigger: 01061482 Segment: 000
BAT Trigger Time: 648850476.672 [s; MET]
Trigger Stop: 648850480.768 [s; MET]
UTC: 2021-07-24T20:14:09.244380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.407397668851 Dec: -6.27450560577922 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.21
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 7.21
Flight Position: [ source = BAT ]
RA: 227.407397668851 Dec: -6.27450560577922 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 227.424646528426 Dec: -6.27858960113662 [deg; J2000]
{ 15h 09m 41.9s , -06d 16' 42.9" }
+/- 1.88871281620593 [arcmin] (estimated 90% radius based on SNR)
+/- 0.949860089906042 [arcmin] (formal 1-sigma fit error)
SNR: 12.2629688951256
Angular difference between Flight and Ground position is 1.057509 arcmin
Partial Coding Fraction: 0.34375 [ including projection effects ]
Duration
T90: 50.567999958992 +/- 9.53724570082791
Measured from: -31.9679999351501
to: 18.6000000238419 [s; relative to TRIGTIME]
T50: 19.6799999475479 +/- 12.7368555213615
Measured from: -11.9159998893738
to: 7.76400005817413 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.51200008392334
to: 0.48799991607666 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.5480000972748
to: 25.4959999322891 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.354138 1.287119 0.566701 0.035111
0.136066 0.121749 0.098282 0.083343 [error]
Peak 0.074221 0.091890 0.020689 0.009428
0.017884 0.016407 0.012614 0.010440 [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 5.20e-07 5.88e-07 4.77e-07 6.46e-07 1.82e-06 2.23e-06 erg/cm2
Error 1.24e-07 7.73e-08 9.68e-08 2.87e-07 2.33e-07 3.63e-07 erg/cm2
Peak flux Power-law 1.54e+00 7.40e-01 2.17e-01 8.02e-02 2.54e+00 2.58e+00 ph/cm2/s
Error 7.20e-01 1.84e-01 1.00e-01 7.64e-02 8.07e-01 7.92e-01 ph/cm2/s
Fluence Cutoff-PL 3.31e-07 6.38e-07 4.83e-07 1.06e-07 1.54e-06 1.56e-06 erg/cm2
Error 1.55e-07 9.05e-08 1.19e-07 2.01e-07 2.90e-07 3.62e-07 erg/cm2
Peak flux Cutoff-PL 1.15e+00 7.86e-01 2.14e-01 2.21e-02 2.17e+00 2.17e+00 ph/cm2/s
Error 9.48e-01 2.20e-01 -------- 8.24e-02 9.86e-01 1.02e+00 ph/cm2/s
Fluence Band 3.29e-07 6.35e-07 4.82e-07 1.07e-07 1.54e-06 1.56e-06 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 2.302 0.281 - - 2.97e-03 4.26e-04 52.230 53
CPL 0.250 1.884 41.5 18.2 3.00e-02 1.90e-01 47.300 52
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.770 0.647 - - 1.09e-02 3.68e-03 54.740 53
CPL 1.327 0.000 20.9 0.0 6.18e-02 0.00e+00 54.230 52
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 64.044 -38.548 25.496
T90 50.568 -31.968 18.600
T50 19.680 -11.916 7.764
Peak 1.000 -0.512 0.488
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
227.4246 -6.2786 0.0157 46.9 -5.8 3.3314 12.3 TRIG_01061482
------------------------------------------
Foreground time interval of the image:
-38.548 25.496 (delta_t = 64.044 [sec])
Background time interval of the image:
-239.672 -38.548 (delta_t = 201.124 [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 -38.548 sec. to 25.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30211 ( -0.268872 0.293858 )
Norm@50keV : 2.97475E-03 ( -0.000430635 0.000421213 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 55 PHA bins.
# Reduced chi-squared = 0.9855 for 53 degrees of freedom
# Null hypothesis probability = 5.039560e-01
Photon flux (15-150 keV) in 64.04 sec: 0.520471 ( -0.0785402 0.08316 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82119e-06 ( -2.32285e-07 2.32753e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.548 sec. to 25.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.250292 ( -2.1577 1.60983 )
Epeak [keV] : 41.5107 ( -27.5819 8.88482 )
Norm@50keV : 3.00339E-02 ( -0.0300339 0.349387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.30 using 55 PHA bins.
# Reduced chi-squared = 0.9095 for 52 degrees of freedom
# Null hypothesis probability = 6.591431e-01
Photon flux (15-150 keV) in 64.04 sec: 0.421183 ( -0.086369 0.101447 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54182e-06 ( -2.75942e-07 3.05042e-07 ) ergs/cm2
Band function
Time interval is from -38.548 sec. to 25.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.343607 ( -1.51053 2.08876 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 41.5052 ( -7.8505 8.88766 )
Norm@50keV : 2.67157E-02 ( -0.0267303 0.614256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.31 using 55 PHA bins.
# Reduced chi-squared = 0.9276 for 51 degrees of freedom
# Null hypothesis probability = 6.211509e-01
Photon flux (15-150 keV) in 64.04 sec: 0.423565 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54193e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.1879 (-1.3723 1.55497)
R^2/D10^2 : 0.135465 (-0.0554813 0.0946309)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 55 PHA bins.
# Reduced chi-squared = 0.9339 for 53 degrees of freedom
# Null hypothesis probability = 6.113215e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.276e-07 5.783e-08
25- 50 6.576e-07 1.154e-07
50-150 4.710e-07 1.438e-07
15-150 1.356e-06 2.257e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 47.6195 (-11.1854 16.6495)
Norm : 2.96494 (-0.541923 0.706699)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.589e-07 7.163e-08
25- 50 6.474e-07 8.248e-08
50-150 5.998e-07 1.660e-07
15-150 1.706e-06 2.241e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.19697 (-1.03468 1.65117)
R1^2/D10^2 : 17.9336 (-15.5559 182.813)
kT2 [keV] : 12.3824 (-1.9153 2.8282)
R2^2/D10^2 : 8.34208E-02 (-0.0507081 0.0773852)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.889e-07 2.266e-07
25- 50 6.236e-07 2.069e-07
50-150 5.332e-07 2.090e-07
15-150 1.646e-06 4.934e-07
Peak spectrum fit
Power-law model
Time interval is from -0.512 sec. to 0.488 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.77029 ( -0.555088 0.739647 )
Norm@50keV : 1.08659E-02 ( -0.00384344 0.00352394 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.74 using 55 PHA bins.
# Reduced chi-squared = 1.033 for 53 degrees of freedom
# Null hypothesis probability = 4.084302e-01
Photon flux (15-150 keV) in 1 sec: 2.54221 ( -0.745249 0.867898 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18581e-07 ( -2.93501e-08 2.93564e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.512 sec. to 0.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32709 ( )
Epeak [keV] : 20.9458 ( )
Norm@50keV : 6.17747E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.23 using 55 PHA bins.
# Reduced chi-squared = 1.043 for 52 degrees of freedom
# Null hypothesis probability = 3.895679e-01
Photon flux (15-150 keV) in 1 sec: 2.16815 ( -0.82906 1.14225 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04269e-07 ( -3.69872e-08 3.8442e-08 ) ergs/cm2
Band function
Time interval is from -0.512 sec. to 0.488 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.181823 ( 1.66431 1.66431 )
beta : -3.56669 ( 4.27418 7.53554 )
Epeak [keV] : 29.0468 ( -16.1372 52.3388 )
Norm@50keV : 0.283635 ( -0.284963 1422.57 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 55 PHA bins.
# Reduced chi-squared = 1.061 for 51 degrees of freedom
# Null hypothesis probability = 3.559580e-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] : 9.03752 (-1.83425 2.2645)
R^2/D10^2 : 1.34282 (-0.811558 2.02509)
(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 2.140e-08 1.074e-08
25- 50 4.578e-08 1.906e-08
50-150 1.769e-08 1.012e-08
15-150 8.487e-08 3.475e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.2312 (-17.1587 35.0171)
Norm : 11.5292 (-4.01765 6.17689)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.732e-08 9.245e-09
25- 50 3.746e-08 1.283e-08
50-150 3.224e-08 2.010e-08
15-150 9.702e-08 3.494e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.47370 (-7.77872 3.15352)
R1^2/D10^2 : 1.65209 (-1.64829 -1.64829)
kT2 [keV] : 35.6744 (-36.3059 -36.3059)
R2^2/D10^2 : 1.33267E-03 (-0.00125247 0.0169679)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.328e-08 1.773e-08
25- 50 4.374e-08 3.851e-08
50-150 2.504e-08 2.171e-08
15-150 9.207e-08 7.425e-08
Plot creation:
Sun Jul 25 18:18:02 EDT 2021