batgrbproduct analysis for trigger=1037828
batgrbproduct Analysis for Trigger=1037828
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 Mar 21 16:07:22 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1037828/batgroup_hand_proc
======================================================================
Trigger: 01037828 Segment: 000
BAT Trigger Time: 638003657.728 [s; MET]
Trigger Stop: 638003659.776 [s; MET]
UTC: 2021-03-21T07:13:51.023260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 87.8737930674534 Dec: 70.119331009023 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.4
Image Trigger?: NO
Rate S/N Ratio: 15.8113883008419 [ if not an image trigger ]
Image S/N Ratio: 7.4
Flight Position: [ source = BAT ]
RA: 87.8737930674534 Dec: 70.119331009023 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 87.8867199366817 Dec: 70.1092886769822 [deg; J2000]
{ 05h 51m 32.8s , +70d 06' 33.4" }
+/- 1.60245081304773 [arcmin] (estimated 90% radius based on SNR)
+/- 0.566365647838952 [arcmin] (formal 1-sigma fit error)
SNR: 15.5084643986701
Angular difference between Flight and Ground position is 0.657766 arcmin
Partial Coding Fraction: 0.3046875 [ including projection effects ]
Duration
T90: 8.21200001239777 +/- 0.503968260000279
Measured from: -6.74400007724762
to: 1.46799993515015 [s; relative to TRIGTIME]
T50: 5.30399990081787 +/- 1.16413742646997
Measured from: -5.25999999046326
to: 0.0439999103546143 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -6.99200010299683
to: -5.99200010299683 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7
to: 1.83599996566772 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.507755 0.492039 0.198536 0.072836
0.042038 0.043865 0.037782 0.032331 [error]
Peak 0.076837 0.066475 0.058035 0.018798
0.013865 0.015284 0.013651 0.011388 [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 1.70e-07 2.10e-07 1.88e-07 2.93e-07 6.69e-07 8.61e-07 erg/cm2
Error 2.31e-08 2.16e-08 3.57e-08 1.08e-07 8.17e-08 1.50e-07 erg/cm2
Peak flux Power-law 7.58e-01 5.77e-01 2.94e-01 2.14e-01 1.73e+00 1.84e+00 ph/cm2/s
Error 2.26e-01 1.23e-01 1.11e-01 1.56e-01 3.64e-01 4.00e-01 ph/cm2/s
Fluence Cutoff-PL 1.68e-07 2.15e-07 1.84e-07 1.83e-07 6.50e-07 7.49e-07 erg/cm2
Error 2.42e-08 2.98e-08 4.61e-08 1.55e-07 1.05e-07 2.31e-07 erg/cm2
Peak flux Cutoff-PL 7.71e-01 5.76e-01 2.85e-01 2.01e-01 1.73e+00 1.84e+00 ph/cm2/s
Error 2.26e-01 1.28e-01 1.09e-01 2.02e-01 3.64e-01 3.96e-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 2.154 0.198 - - 8.10e-03 1.11e-03 64.200 57
CPL 1.979 0.620 4.6 -0.4 1.04e-02 2.68e-02 64.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.975 0.427 - - 1.17e-02 3.32e-03 60.820 57
CPL 2.024 0.896 12.1 0.0 1.05e-02 0.00e+00 60.720 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 8.836 -7.000 1.836
T90 8.212 -6.744 1.468
T50 5.304 -5.260 0.044
Peak 1.000 -6.992 -5.992
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
87.8867 +70.1093 0.0124 35.0 -109.6 1.2886 15.5 TRIG_01037828
------------------------------------------
Foreground time interval of the image:
-7.000 1.836 (delta_t = 8.836 [sec])
Background time interval of the image:
-239.728 -7.000 (delta_t = 232.728 [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 -7.000 sec. to 1.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15435 ( -0.192139 0.203296 )
Norm@50keV : 8.09896E-03 ( -0.00112464 0.00109998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.20 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.39e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 8.836 sec: 1.30945 ( -0.130718 0.130735 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.68833e-07 ( -8.07651e-08 8.25796e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.000 sec. to 1.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97883 ( -1.20668 0.0338389 )
Epeak [keV] : 4.56955 ( -3.74776 -4.56955 )
Norm@50keV : 1.04007E-02 ( -0.0041058 0.0495269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.04 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.15e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 8.836 sec: 1.29937 ( -0.13793 0.13652 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50371e-07 ( -1.11318e-07 9.77703e-08 ) ergs/cm2
Band function
Time interval is from -7.000 sec. to 1.836 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91560 ( -14.3726 -4.9156 )
beta : -2.34244 ( -0.354408 0.247064 )
Epeak [keV] : 21.8174 ( -3.73109 3.39779 )
Norm@50keV : 3266.84 ( -323.324 17595 )
------------------------------------------------------------
Photon flux (15-150 keV) in 8.836 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] : 8.20225 (-0.916533 1.03514)
R^2/D10^2 : 1.29477 (-0.491153 0.79502)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 79.20 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.75e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.417e-07 2.456e-08
25- 50 2.589e-07 3.468e-08
50-150 7.374e-08 2.423e-08
15-150 4.743e-07 6.636e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 47.8767 (-12.0357 18.9988)
Norm : 7.58158 (-1.3231 1.73307)
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.86 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.22e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.621e-07 2.169e-08
25- 50 2.292e-07 2.487e-08
50-150 2.135e-07 6.044e-08
15-150 6.048e-07 8.164e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.09694 (-1.1753 1.07475)
R1^2/D10^2 : 2.14752 (-0.780812 2.02208)
kT2 [keV] : 69.8633 (-46.8933 -70.3616)
R2^2/D10^2 : 5.96205E-04 (-0.000517272 0.00736666)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.24 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.24e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.578e-07 3.190e-08
25- 50 2.354e-07 5.191e-08
50-150 3.027e-07 1.545e-07
15-150 6.960e-07 1.964e-07
Peak spectrum fit
Power-law model
Time interval is from -6.992 sec. to -5.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97469 ( -0.399539 0.453892 )
Norm@50keV : 1.16545E-02 ( -0.00342785 0.0032058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.82 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.40e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.72814 ( -0.363978 0.36398 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07348e-07 ( -2.85175e-08 2.97364e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.992 sec. to -5.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02370 ( -0.402041 1.38899 )
Epeak [keV] : 12.1130 ( )
Norm@50keV : 1.05009E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.72 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.10e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.72678 ( -0.36376 0.36373 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06987e-07 ( -2.85358e-08 2.9399e-08 ) ergs/cm2
Band function
Time interval is from -6.992 sec. to -5.992 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94912 ( -4.94912 -4.94912 )
beta : -2.11504 ( -0.656901 0.470866 )
Epeak [keV] : 21.1541 ( -21.1541 6.2529 )
Norm@50keV : 5227.19 ( -1095.36 2.01403e+07 )
------------------------------------------------------------
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] : 7.26328 (-1.83486 3.17445)
R^2/D10^2 : 2.66204 (-1.99903 5.98729)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 69.81 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.19e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.341e-08 1.213e-08
25- 50 3.439e-08 1.609e-08
50-150 6.502e-09 4.712e-09
15-150 6.430e-08 2.698e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 71.2995 (-38.0379 -71.3512)
Norm : 8.39664 (-2.50427 4.32239)
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.33 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.93e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.158e-08 7.100e-09
25- 50 3.451e-08 1.306e-08
50-150 4.493e-08 3.321e-08
15-150 1.010e-07 4.187e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.37835 (-1.51165 2.00876)
R1^2/D10^2 : 7.56846 (-5.36426 22.6886)
kT2 [keV] : 30.0446 (-13.9962 -30.0461)
R2^2/D10^2 : 1.08033E-02 (-0.0105757 0.0820316)
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.49e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.595e-08 1.438e-08
25- 50 2.843e-08 1.559e-08
50-150 6.104e-08 3.620e-08
15-150 1.154e-07 5.640e-08
Plot creation:
Sun Mar 21 16:11:49 EDT 2021