batgrbproduct analysis for trigger=1037339
batgrbproduct Analysis for Trigger=1037339
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 Mar 18 16:26:01 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1037339/batgroup_hand_proc
======================================================================
Trigger: 01037339 Segment: 000
BAT Trigger Time: 637732498.368 [s; MET]
Trigger Stop: 637732501.44 [s; MET]
UTC: 2021-03-18T03:54:31.681240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.9302682502313 Dec: -37.7895119002422 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.72
Image Trigger?: NO
Rate S/N Ratio: 11.2694276695846 [ if not an image trigger ]
Image S/N Ratio: 7.72
Flight Position: [ source = BAT ]
RA: 33.9302682502313 Dec: -37.7895119002422 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 33.8916932598794 Dec: -37.7549054652797 [deg; J2000]
{ 02h 15m 34.0s , -37d 45' 17.7" }
+/- 2.91463207632967 [arcmin] (estimated 90% radius based on SNR)
+/- 1.25511264554296 [arcmin] (formal 1-sigma fit error)
SNR: 6.59822806488327
Angular difference between Flight and Ground position is 2.767391 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -12.3680000305176
to: 35.6319999694824 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -12.3680000305176
to: 19.6319999694824 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.1319999694824
to: 12.1319999694824 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.3680000305176
to: 35.6319999694824 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.256694 0.375941 0.292996 0.110064
0.055427 0.057948 0.052439 0.049690 [error]
Peak -0.011685 0.013806 0.022890 0.006257
0.008191 0.008256 0.007610 0.007260 [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 8.38e-08 1.56e-07 2.24e-07 6.80e-07 6.37e-07 1.14e-06 erg/cm2
Error 2.52e-08 2.77e-08 5.40e-08 3.68e-07 1.28e-07 4.07e-07 erg/cm2
Peak flux Power-law 3.08e-02 6.89e-02 1.21e-01 5.02e-01 3.32e-01 7.23e-01 ph/cm2/s
Error 4.94e-02 7.02e-02 7.55e-02 1.00e+00 2.56e-01 8.57e-01 ph/cm2/s
Fluence Cutoff-PL 8.49e-08 1.56e-07 2.24e-07 6.23e-07 6.38e-07 1.08e-06 erg/cm2
Error 2.50e-08 2.71e-08 5.38e-08 4.53e-07 1.26e-07 3.78e-07 erg/cm2
Peak flux Cutoff-PL 1.68e-02 6.77e-02 1.45e-01 1.59e-01 3.20e-01 3.84e-01 ph/cm2/s
Error 4.75e-02 7.33e-02 9.26e-02 4.39e-01 1.81e-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 1.479 0.329 - - 1.39e-03 2.48e-04 47.730 0
CPL 1.490 0.534 9999.4 0.0 1.39e-03 9.71e-04 47.740 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.181 0.544 - - 2.60e-03 2.20e-03 68.040 0
CPL -1.711 4.247 126.3 0.0 1.36e-02 1.78e+01 0.133 0
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: 8.832000 sec.
T50 in the 50-300 keV band: 5.056000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 -12.368 35.632
T90 48.000 -12.368 35.632
T50 32.000 -12.368 19.632
Peak 1.000 11.132 12.132
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
33.8917 -37.7549 0.0291 30.5 -152.3 1.0330 6.6 TRIG_01037339
------------------------------------------
Foreground time interval of the image:
-12.368 35.632 (delta_t = 48.000 [sec])
Background time interval of the image:
-60.368 -12.368 (delta_t = 48.000 [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 -12.368 sec. to 35.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47869 ( -0.325136 0.333352 )
Norm@50keV : 1.39493E-03 ( -0.000250714 0.000245666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.73 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.04e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 48 sec: 0.173163 ( -0.0297214 0.0297918 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.37459e-07 ( -1.26891e-07 1.29438e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.368 sec. to 35.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48962 ( -0.745126 0.322724 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.38934E-03 ( -0.000249701 0.00169309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.74 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.76e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 48 sec: 0.173498 ( -0.03007 0.029464 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.38419e-07 ( -1.27661e-07 1.24776e-07 ) ergs/cm2
Band function
Time interval is from -12.368 sec. to 35.632 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24016 ( 1.24014 1.24014 )
beta : -1.47865 ( -0.332748 0.325774 )
Epeak [keV] : 20.0828 ( -20.0892 -20.0892 )
Norm@50keV : 2.90155E-03 ( -0.00174286 0.220078 )
------------------------------------------------------------
Photon flux (15-150 keV) in 48 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] : 16.5383 (-4.58413 6.22978)
R^2/D10^2 : 1.33944E-02 (-0.00861647 0.0272574)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.43 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.60e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.607e-08 1.488e-08
25- 50 1.561e-07 5.549e-08
50-150 3.020e-07 1.172e-07
15-150 4.942e-07 1.425e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-94.2219 -199.363)
Norm : 0.704481 (-0.119906 0.119904)
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.88 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.69e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.420e-08 4.927e-08
25- 50 1.620e-07 9.274e-08
50-150 3.552e-07 2.028e-07
15-150 6.014e-07 3.377e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.60511 (-2.22749 2.78379)
R1^2/D10^2 : 0.459438 (-0.362194 3.87607)
kT2 [keV] : 30.6692 (-10.1972 30.7069)
R2^2/D10^2 : 1.52807E-03 (-0.00129563 0.00421945)
------------------------------------------------------------
#Fit statistic : Chi-Squared 46.42 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.88e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.357e-08 5.280e-08
25- 50 1.373e-07 7.337e-08
50-150 4.413e-07 2.513e-07
15-150 6.721e-07 3.617e-07
Peak spectrum fit
Power-law model
Time interval is from 11.132 sec. to 12.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.181096 ( -0.181233 0.906904 )
Norm@50keV : 2.60358E-03 ( -0.00260377 0.00179842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.04 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.50e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.331522 ( -0.331579 0.180798 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.16444e-08 ( -1.93006e-08 1.93395e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.132 sec. to 12.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.71071 ( -8.25202 0.241948 )
Epeak [keV] : 126.290 ( -343.59 -343.59 )
Norm@50keV : 1.36141E-02 ( -0.0130894 35.5826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.86 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.33e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.320343 ( -0.17792 0.18469 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.96095e-08 ( -3.96095e-08 2.09627e-08 ) ergs/cm2
Band function
Time interval is from 11.132 sec. to 12.132 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.279504 ( 0.273622 0.273622 )
beta : -0.181804 ( -0.906866 0.18124 )
Epeak [keV] : 16.9649 ( -16.9822 -16.9822 )
Norm@50keV : 4.28629E-03 ( -0.00428586 20841.8 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 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] : 36.7546 (-18.1738 -36.752)
R^2/D10^2 : 3.35022E-03 (-0.00335083 0.0202982)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.92 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.53e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.199e-10 4.062e-10
25- 50 4.119e-09 2.580e-09
50-150 3.532e-08 2.424e-08
15-150 4.005e-08 2.473e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-124.736 -199.363)
Norm : 1.27504 (-0.811159 0.811223)
------------------------------------------------------------
#Fit statistic : Chi-Squared 74.00 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.45e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.167e-10 1.344e-11
25- 50 3.568e-13 4.416e-15
50-150 3.811e-21 0.000e+00
15-150 6.170e-10 3.634e-11
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.00007E-04 (-0.000100007 -0.000100007)
R1^2/D10^2 : 2.41231E+09 (-2.4123e+09 -2.4123e+09)
kT2 [keV] : 36.7486 (-18.172 -36.7503)
R2^2/D10^2 : 3.35163E-03 (-0.00335124 0.0202978)
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.92 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.13e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.398e-10 5.035e-10
25- 50 4.688e-09 3.014e-09
50-150 3.314e-08 2.096e-08
15-150 3.856e-08 2.510e-08
Plot creation:
Thu Mar 18 16:34:04 EDT 2021