batgrbproduct analysis for trigger=1048372
batgrbproduct Analysis for Trigger=1048372
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 May 15 13:06:23 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1048372/GCN5_download_cron
======================================================================
Trigger: 01048372 Segment: 000
BAT Trigger Time: 642709453.824 [s; MET]
Trigger Stop: 642709454.848 [s; MET]
UTC: 2021-05-14T18:23:46.806320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 2.94222114163308 Dec: -21.8920543361152 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.43
Image Trigger?: NO
Rate S/N Ratio: 128.61959415268 [ if not an image trigger ]
Image S/N Ratio: 22.43
Flight Position: [ source = BAT ]
RA: 2.94222114163308 Dec: -21.8920543361152 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 2.94663396761142 Dec: -21.8983216028041 [deg; J2000]
{ 00h 11m 47.2s , -21d 53' 54.0" }
+/- 0.647121493903128 [arcmin] (estimated 90% radius based on SNR)
+/- 0.184973299329085 [arcmin] (formal 1-sigma fit error)
SNR: 56.6420065638657
Angular difference between Flight and Ground position is 0.449174 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 70.2120000123978 +/- 0.737183765927477
Measured from: -0.25599992275238
to: 69.9560000896454 [s; relative to TRIGTIME]
T50: 31.2679998874664 +/- 4.21879842097321
Measured from: 11.4720001220703
to: 42.7400000095367 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.519999980926514
to: 0.480000019073486 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.08399999141693
to: 75.1280000209808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.845594 4.843274 3.234350 0.731195
0.068738 0.072726 0.063737 0.051825 [error]
Peak 0.235683 0.406084 0.381882 0.095673
0.011861 0.014487 0.014401 0.010242 [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 1.17e-06 1.96e-06 2.50e-06 6.37e-06 7.40e-06 1.20e-05 erg/cm2
Error 5.23e-08 4.93e-08 6.94e-08 4.11e-07 1.67e-07 4.44e-07 erg/cm2
Peak flux Power-law 2.25e+00 2.74e+00 2.42e+00 3.69e+00 8.69e+00 1.11e+01 ph/cm2/s
Error 1.73e-01 1.28e-01 1.15e-01 3.71e-01 3.57e-01 4.84e-01 ph/cm2/s
Fluence Cutoff-PL 1.12e-06 1.99e-06 2.53e-06 4.85e-06 7.29e-06 1.05e-05 erg/cm2
Error 6.93e-08 5.27e-08 7.59e-08 7.98e-07 1.94e-07 1.10e-06 erg/cm2
Peak flux Cutoff-PL 1.96e+00 2.84e+00 2.57e+00 2.12e+00 8.47e+00 9.49e+00 ph/cm2/s
Error 2.19e-01 1.43e-01 1.41e-01 5.85e-01 3.73e-01 6.97e-01 ph/cm2/s
Fluence Band 1.07e-06 2.00e-06 2.49e-06 5.83e-06 7.27e-06 1.14e-05 erg/cm2
Error -------- 6.25e-08 5.94e-08 -------- 1.91e-07 -------- erg/cm2
Peak flux Band 1.98e+00 2.83e+00 2.57e+00 2.24e+00 8.50e+00 9.62e+00 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 1.653 0.043 - - 1.04e-02 2.27e-04 39.550 57
CPL 1.449 0.176 146.2 229.0 1.30e-02 2.37e-03 35.460 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.178 0.070 - - 7.43e-02 2.99e-03 58.040 57
CPL 0.601 0.309 133.7 55.3 1.37e-01 4.52e-02 46.500 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: 66.944000 sec.
T50 in the 50-300 keV band: 31.040000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 76.212 -1.084 75.128
T90 70.212 -0.256 69.956
T50 31.268 11.472 42.740
Peak 1.000 -0.520 0.480
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
2.9466 -21.8983 0.0034 16.0 67.2 5.1229 56.6 TRIG_01048372
------------------------------------------
Foreground time interval of the image:
-1.084 14.877 (delta_t = 15.961 [sec])
Background time interval of the image:
-172.723 -1.084 (delta_t = 171.639 [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 -1.084 sec. to 75.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65262 ( -0.0431893 0.0432686 )
Norm@50keV : 1.04481E-02 ( -0.000227339 0.000227304 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 39.55 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.62e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 76.21 sec: 1.36545 ( -0.0341384 0.0342811 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.4035e-06 ( -1.66572e-07 1.66738e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.084 sec. to 75.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44896 ( -0.17908 0.17214 )
Epeak [keV] : 146.190 ( -43.9622 414.034 )
Norm@50keV : 1.29651E-02 ( -0.00210864 0.00263884 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 35.46 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.85e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 76.21 sec: 1.34055 ( -0.0394 0.03964 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.28929e-06 ( -1.94092e-07 1.93078e-07 ) ergs/cm2
Band function
Time interval is from -1.084 sec. to 75.128 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12480 ( -0.368113 2.76691 )
beta : -1.73764 ( 1.73866 0.0857389 )
Epeak [keV] : 69.1575 ( -42.6141 198.739 )
Norm@50keV : 2.02460E-02 ( -0.00832274 0.142245 )
------------------------------------------------------------
Photon flux (15-150 keV) in 76.21 sec: 1.33680 ( 5.6632 -0.04511 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.26857e-06 ( -7.26803e-06 -1.90868e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.3944 ( )
R^2/D10^2 : 0.128664 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 447.65 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.18e-62 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.843e-07 2.267e-08
25- 50 1.970e-06 5.525e-08
50-150 3.214e-06 1.322e-07
15-150 5.668e-06 1.410e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 170.107 (-19.1805 23.6304)
Norm : 5.46980 (-0.150224 0.159422)
------------------------------------------------------------
#Fit statistic : Chi-Squared 37.92 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.76e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.058e-06 5.030e-08
25- 50 1.995e-06 1.056e-07
50-150 4.138e-06 8.650e-07
15-150 7.191e-06 9.576e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.63352 (-0.642824 0.668466)
R1^2/D10^2 : 1.07665 (-0.264806 0.387321)
kT2 [keV] : 27.5505 (-2.44223 3.1391)
R2^2/D10^2 : 1.24176E-02 (-0.00403327 0.00519169)
------------------------------------------------------------
#Fit statistic : Chi-Squared 46.05 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.00e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.513e-07 6.478e-08
25- 50 2.045e-06 8.917e-08
50-150 4.179e-06 2.747e-07
15-150 7.175e-06 3.529e-07
Peak spectrum fit
Power-law model
Time interval is from -0.520 sec. to 0.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17764 ( -0.0701916 0.0702175 )
Norm@50keV : 7.42888E-02 ( -0.00298953 0.00298941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.04 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.37e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 8.69351 ( -0.356419 0.356641 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58539e-07 ( -3.45594e-08 3.46769e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.520 sec. to 0.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.600840 ( -0.31968 0.298304 )
Epeak [keV] : 133.679 ( -29.1834 81.3325 )
Norm@50keV : 0.137285 ( -0.0365372 0.053778 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 46.50 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.13e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 8.47203 ( -0.37324 0.37309 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.34455e-07 ( -3.7525e-08 3.7389e-08 ) ergs/cm2
Band function
Time interval is from -0.520 sec. to 0.480 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.600817 ( -0.293917 0.279014 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 133.658 ( -16.5216 81.3189 )
Norm@50keV : 0.137284 ( -0.0365589 0.0537728 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 8.50055 ( ) 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] : 18.9941 ( )
R^2/D10^2 : 0.484194 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 120.49 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.91e-06 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.434e-08 2.870e-09
25- 50 1.651e-07 9.750e-09
50-150 4.378e-07 3.065e-08
15-150 6.373e-07 3.210e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 35.5622 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 127.06 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.96e-07 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.855e-08 3.570e-09
25- 50 1.703e-07 7.200e-09
50-150 3.736e-07 1.720e-08
15-150 6.325e-07 2.730e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.51455 (-1.68209 2.07693)
R1^2/D10^2 : 4.59703 (-2.26714 5.93145)
kT2 [keV] : 26.8738 (-3.25274 5.52815)
R2^2/D10^2 : 0.131401 (-0.0649004 0.079171)
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.65 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.14e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.047e-08 1.338e-08
25- 50 1.630e-07 2.180e-08
50-150 5.067e-07 6.790e-08
15-150 7.302e-07 8.470e-08
Plot creation:
Sat May 15 13:10:44 EDT 2021