batgrbproduct analysis for trigger=1038247
batgrbproduct Analysis for Trigger=1038247
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): Wed Mar 24 20:48:35 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1038247/GCN5_download_cron
======================================================================
Trigger: 01038247 Segment: 000
BAT Trigger Time: 638229765.184 [s; MET]
Trigger Stop: 638229765.248 [s; MET]
UTC: 2021-03-23T22:02:18.464260 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 317.952404831532 Dec: 25.3779613350552 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.41
Image Trigger?: NO
Rate S/N Ratio: 41.1703777004778 [ if not an image trigger ]
Image S/N Ratio: 11.41
Flight Position: [ source = BAT ]
RA: 317.952404831532 Dec: 25.3779613350552 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 317.944750184212 Dec: 25.3524160792035 [deg; J2000]
{ 21h 11m 46.7s , +25d 21' 08.7" }
+/- 1.44576748022531 [arcmin] (estimated 90% radius based on SNR)
+/- 0.602584521671262 [arcmin] (formal 1-sigma fit error)
SNR: 17.9641348235269
Angular difference between Flight and Ground position is 1.587905 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 1.12399995326996 +/- 0.322893201432382
Measured from: -0.0719999074935913
to: 1.05200004577637 [s; relative to TRIGTIME]
T50: 0.247999906539917 +/- 0.109178796885355
Measured from: 0.00800013542175293
to: 0.25600004196167 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0959999561309814
to: 0.904000043869019 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0920000076293945
to: 1.25600004196167 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.105090 0.140492 0.110308 0.028093
0.011192 0.011798 0.011046 0.009195 [error]
Peak 0.096334 0.127420 0.107504 0.026509
0.010013 0.010764 0.010213 0.008362 [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 3.13e-08 5.91e-08 8.62e-08 2.68e-07 2.44e-07 4.45e-07 erg/cm2
Error 4.98e-09 5.67e-09 1.08e-08 7.29e-08 2.60e-08 8.11e-08 erg/cm2
Peak flux Power-law 8.99e-01 9.64e-01 7.34e-01 9.11e-01 2.94e+00 3.51e+00 ph/cm2/s
Error 1.47e-01 9.39e-02 8.45e-02 2.23e-01 2.66e-01 3.27e-01 ph/cm2/s
Fluence Cutoff-PL 3.13e-08 5.92e-08 8.62e-08 2.65e-07 2.44e-07 4.42e-07 erg/cm2
Error 4.61e-09 6.05e-09 1.11e-08 1.03e-07 2.70e-08 1.04e-07 erg/cm2
Peak flux Cutoff-PL 8.99e-01 9.65e-01 7.34e-01 9.04e-01 2.94e+00 3.51e+00 ph/cm2/s
Error 1.51e-01 9.46e-02 8.48e-02 3.16e-01 2.66e-01 4.01e-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 1.456 0.166 - - 1.90e-02 1.79e-03 53.630 57
CPL 1.453 0.720 9998.5 0.0 1.90e-02 1.55e-02 53.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.393 0.164 - - 2.42e-02 2.20e-03 55.510 57
CPL 1.390 0.325 10000.0 0.0 2.43e-02 2.19e-03 55.520 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.348 -0.092 1.256
T90 1.124 -0.072 1.052
T50 0.248 0.008 0.256
Peak 1.000 -0.096 0.904
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
317.9448 +25.3524 0.0107 30.3 -22.4 0.4004 18.0 TRIG_01038247
------------------------------------------
Foreground time interval of the image:
-0.092 1.256 (delta_t = 1.348 [sec])
Background time interval of the image:
-19.083 -0.092 (delta_t = 18.991 [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 -0.092 sec. to 1.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45558 ( -0.165526 0.166728 )
Norm@50keV : 1.89678E-02 ( -0.00179857 0.00178687 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.63 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.02e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1.348 sec: 2.34078 ( -0.217185 0.217462 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44425e-07 ( -2.58328e-08 2.61094e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.092 sec. to 1.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45285 ( -0.574073 0.866745 )
Epeak [keV] : 9998.47 ( -9998.57 -9998.57 )
Norm@50keV : 1.90298E-02 ( -0.0118074 0.0192819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.63 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.65e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1.348 sec: 2.34024 ( -0.21721 0.21705 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44355e-07 ( -2.79858e-08 2.59962e-08 ) ergs/cm2
Band function
Time interval is from -0.092 sec. to 1.256 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04112 ( 1.02578 1.02578 )
beta : -1.46191 ( 1.46216 0.171182 )
Epeak [keV] : 53.3916 ( -51.4754 -51.4754 )
Norm@50keV : 3.97987E-02 ( -0.0254567 0 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1.348 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] : 15.3473 (-1.89712 2.22202)
R^2/D10^2 : 0.242126 (-0.089897 0.140792)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 86.74 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.76e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.603e-08 3.079e-09
25- 50 6.504e-08 9.200e-09
50-150 1.053e-07 1.936e-08
15-150 1.864e-07 2.339e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-50.9216 -200)
Norm : 9.54218 (-0.876405 0.876405)
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.28 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.40e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.216e-08 1.395e-08
25- 50 6.185e-08 1.442e-08
50-150 1.357e-07 5.720e-08
15-150 2.297e-07 1.028e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.14605 (-1.82623 2.5392)
R1^2/D10^2 : 3.77818 (-2.57735 6.80565)
kT2 [keV] : 26.0814 (-6.04695 15.0956)
R2^2/D10^2 : 3.30084E-02 (-0.0256073 0.0515542)
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.06 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.72e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.158e-08 1.541e-08
25- 50 5.755e-08 2.095e-08
50-150 1.519e-07 8.112e-08
15-150 2.410e-07 8.490e-08
Peak spectrum fit
Power-law model
Time interval is from -0.096 sec. to 0.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39320 ( -0.163845 0.164586 )
Norm@50keV : 2.42019E-02 ( -0.00220346 0.0021934 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.51 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.31e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.94282 ( -0.266003 0.266374 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34182e-07 ( -2.40845e-08 2.43333e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.096 sec. to 0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39018 ( -0.447739 0.201886 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 2.42888E-02 ( -0.00221726 0.00215558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.52 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.93e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.94198 ( -0.2658 0.26595 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34031e-07 ( -2.403e-08 2.406e-08 ) ergs/cm2
Band function
Time interval is from -0.096 sec. to 0.904 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07107 ( 1.06753 1.06753 )
beta : -1.39389 ( 1.39384 0.164469 )
Epeak [keV] : 51.8079 ( -51.182 -51.182 )
Norm@50keV : 4.64839E-02 ( -0.0198136 2.22021e+06 )
------------------------------------------------------------
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] : 16.1446 (-2.04599 2.40936)
R^2/D10^2 : 0.256693 (-0.0960088 0.151179)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 92.83 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.91e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.381e-08 2.700e-09
25- 50 5.854e-08 7.085e-09
50-150 1.070e-07 1.954e-08
15-150 1.794e-07 2.300e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.3341 -200)
Norm : 12.0619 (-1.0767 1.0767)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.45 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.87e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.003e-08 9.000e-09
25- 50 5.777e-08 2.311e-08
50-150 1.267e-07 6.833e-08
15-150 2.145e-07 5.790e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.37043 (-1.95986 2.71337)
R1^2/D10^2 : 4.12757 (-2.82383 12.8237)
kT2 [keV] : 28.4337 (-6.94151 19.9031)
R2^2/D10^2 : 3.27279E-02 (-0.026233 0.0532154)
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.71 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.75e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.841e-08 1.405e-08
25- 50 5.313e-08 1.747e-08
50-150 1.532e-07 5.873e-08
15-150 2.348e-07 8.478e-08
Plot creation:
Wed Mar 24 20:53:35 EDT 2021