batgrbproduct analysis for trigger=1100848
batgrbproduct Analysis for Trigger=1100848
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 Apr 3 03:35:37 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1100848/GCN5_download_cron
======================================================================
Trigger: 01100848 Segment: 000
BAT Trigger Time: 670564511.388 [s; MET]
Trigger Stop: 670564511.42 [s; MET]
UTC: 2022-04-02T03:54:42.499260 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 30.6924702697254 Dec: -61.3764117991001 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.83
Image Trigger?: NO
Rate S/N Ratio: 6.32455532033676 [ if not an image trigger ]
Image S/N Ratio: 6.83
Flight Position: [ source = BAT ]
RA: 30.6924702697254 Dec: -61.3764117991001 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 30.6890429299858 Dec: -61.3477737119367 [deg; J2000]
{ 02h 02m 45.4s , -61d 20' 52.0" }
+/- 4.61523600010376 [arcmin] (estimated 90% radius based on SNR)
+/- 2.6390931763747 [arcmin] (formal 1-sigma fit error)
SNR: 3.4219206297732
Angular difference between Flight and Ground position is 1.721109 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 0.031999945640564 +/-
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
T50: 0.031999945640564 +/-
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.031999945640564 second)
Measured from: 5.96046447753906e-08
to: 0.0320000052452087 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.008719 -0.001350 0.000470 -0.000157
0.001568 0.001084 0.000878 0.000630 [error]
Peak 0.008719 -0.001350 0.000470 -0.000157
0.001568 0.001084 0.000878 0.000630 [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 1.15e-09 2.47e-10 2.69e-11 3.19e-12 1.44e-09 1.42e-09 erg/cm2
Error 5.72e-10 2.51e-10 5.25e-11 1.43e-11 7.68e-10 7.70e-10 erg/cm2
Peak flux Power-law 1.25e+00 1.56e-01 8.44e-03 4.79e-04 1.42e+00 1.42e+00 ph/cm2/s
Error 6.15e-01 1.55e-01 1.60e-02 2.00e-03 7.18e-01 7.18e-01 ph/cm2/s
Fluence Cutoff-PL 2.19e-09 3.33e-10 2.46e-14 2.02e-25 2.53e-09 2.52e-09 erg/cm2
Error 7.73e-10 2.44e-10 2.62e-13 8.06e-21 9.29e-10 9.30e-10 erg/cm2
Peak flux Cutoff-PL 2.27e+00 2.39e-01 1.02e-05 4.95e-17 2.52e+00 2.51e+00 ph/cm2/s
Error 8.03e-01 1.63e-01 9.57e-05 1.45e-12 8.91e-01 8.91e-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 5.190 1.552 - - 7.65e-04 1.15e-03 52.550 57
CPL 1.000 0.000 50.0 0.0 1.13e-03 0.00e+00 63.830 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.190 1.552 - - 7.65e-04 1.15e-03 52.550 57
CPL 1.000 0.000 50.0 0.0 1.13e-03 0.00e+00 63.830 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
30.6890 -61.3478 0.0563 31.9 -14.9 0.0075 3.4 TRIG_01100848
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-60.388 -7.388 (delta_t = 53.000 [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 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.19034 ( -1.14152 1.96198 )
Norm@50keV : 7.65480E-04 ( -0.000757368 0.00154501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9219 for 57 degrees of freedom
# Null hypothesis probability = 6.425659e-01
Photon flux (15-150 keV) in 0.032 sec: 1.41709 ( -0.719984 0.715645 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43722e-09 ( -7.28624e-10 8.06467e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.13451E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.83 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 56 degrees of freedom
# Null hypothesis probability = 2.204609e-01
Photon flux (15-150 keV) in 0.032 sec: 2.51509 2.53334 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33681e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.54024 ( 4.16701 6.54024 )
beta : -5.32693 ( -1.90803 1.20739 )
Epeak [keV] : 9999.28 ( -9999.28 -9999.28 )
Norm@50keV : 8.85405E-02 ( -0.0964772 0.216946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9558 for 55 degrees of freedom
# Null hypothesis probability = 5.680012e-01
Photon flux (15-150 keV) in 0.032 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] : 3.18545 (-0.727119 0.681642)
R^2/D10^2 : 201.343 (-197.802 658.772)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.75 using 59 PHA bins.
# Reduced chi-squared = 0.8202 for 57 degrees of freedom
# Null hypothesis probability = 8.316337e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.732e-09 1.115e-09
25- 50 3.097e-10 2.379e-10
50-150 8.001e-13 1.338e-12
15-150 2.042e-09 1.269e-09
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.03623 (-2.13156 2.63519)
Norm : 219.182 (-223.741 666.459)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.481e-09 8.933e-10
25- 50 2.787e-10 2.176e-10
50-150 3.445e-12 5.261e-12
15-150 1.763e-09 1.127e-09
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.23280 (-3.21091 196.774)
R1^2/D10^2 : 185.546 (-91.3173 -91.3173)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.46783E-05 (-1.35317e-05 -1.35317e-05)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.745e-09 1.021e+00
25- 50 3.212e-10 8.283e+00
50-150 8.860e-13 2.222e+02
15-150 2.067e-09 2.056e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.19034 ( -1.14152 1.96198 )
Norm@50keV : 7.65480E-04 ( -0.000757368 0.00154501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9219 for 57 degrees of freedom
# Null hypothesis probability = 6.425659e-01
Photon flux (15-150 keV) in 0.032 sec: 1.41709 ( -0.719984 0.715645 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43722e-09 ( -7.28624e-10 8.06467e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.13451E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.83 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 56 degrees of freedom
# Null hypothesis probability = 2.204609e-01
Photon flux (15-150 keV) in 0.032 sec: 2.51509 2.53334 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33681e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.54024 ( 4.16701 6.54024 )
beta : -5.32693 ( -1.90803 1.20739 )
Epeak [keV] : 9999.28 ( -9999.28 -9999.28 )
Norm@50keV : 8.85405E-02 ( -0.0964772 0.216946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9558 for 55 degrees of freedom
# Null hypothesis probability = 5.680012e-01
Photon flux (15-150 keV) in 0.032 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] : 3.18545 (-0.727119 0.681642)
R^2/D10^2 : 201.343 (-197.802 658.772)
(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 1.732e-09 1.153e-09
25- 50 3.097e-10 2.325e-10
50-150 8.001e-13 1.513e-12
15-150 2.042e-09 1.273e-09
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.03623 (-2.13156 2.63519)
Norm : 219.182 (-223.741 666.459)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.481e-09 9.123e-10
25- 50 2.787e-10 2.344e-10
50-150 3.445e-12 5.277e-12
15-150 1.763e-09 1.152e-09
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.23280 (-3.21091 196.774)
R1^2/D10^2 : 185.546 (-91.3173 -91.3173)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.46783E-05 (-1.35317e-05 -1.35317e-05)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.745e-09 1.086e+00
25- 50 3.212e-10 8.899e+00
50-150 8.860e-13 2.179e+02
15-150 2.067e-09 2.082e+02
Plot creation:
Sun Apr 3 03:43:41 EDT 2022