batgrbproduct analysis for trigger=1104842
batgrbproduct Analysis for Trigger=1104842
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): Mon May 2 16:32:30 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1104842/batgroup_hand_proc
======================================================================
Trigger: 01104842 Segment: 000
BAT Trigger Time: 673127540.288 [s; MET]
Trigger Stop: 673127541.312 [s; MET]
UTC: 2022-05-01T19:51:51.225760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.5770464780323 Dec: 14.0334581384361 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.97
Image Trigger?: NO
Rate S/N Ratio: 23.832750575626 [ if not an image trigger ]
Image S/N Ratio: 8.97
Flight Position: [ source = BAT ]
RA: 85.5770464780323 Dec: 14.0334581384361 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 85.5832914006331 Dec: 14.0101492322021 [deg; J2000]
{ 05h 42m 20.0s , +14d 00' 36.5" }
+/- 1.57869804827549 [arcmin] (estimated 90% radius based on SNR)
+/- 0.659958786877269 [arcmin] (formal 1-sigma fit error)
SNR: 15.8428748427859
Angular difference between Flight and Ground position is 1.445010 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 202.239999890327 +/- 20.6013405693838
Measured from: 0.455999970436096
to: 202.695999860764 [s; relative to TRIGTIME]
T50: 40.703999876976 +/- 9.5580952067322
Measured from: 5.83200001716614
to: 46.5359998941422 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.27600002288818
to: 5.27600002288818 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.20799994468689
to: 224.200000047684 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.028265 1.620411 1.071470 0.090400
0.098440 0.101295 0.087238 0.076115 [error]
Peak 0.028821 0.046165 0.072346 0.019344
0.006893 0.007677 0.007248 0.005608 [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 3.27e-07 5.86e-07 8.05e-07 2.29e-06 2.32e-06 4.01e-06 erg/cm2
Error 4.02e-08 4.51e-08 8.35e-08 4.99e-07 2.01e-07 5.69e-07 erg/cm2
Peak flux Power-law 2.14e-01 3.39e-01 4.05e-01 9.44e-01 1.23e+00 1.90e+00 ph/cm2/s
Error 6.31e-02 6.19e-02 5.33e-02 2.68e-01 1.66e-01 2.86e-01 ph/cm2/s
Fluence Cutoff-PL 2.85e-07 6.42e-07 8.29e-07 6.86e-07 2.15e-06 2.44e-06 erg/cm2
Error 4.81e-08 5.86e-08 9.42e-08 -------- 2.23e-07 5.58e-07 erg/cm2
Peak flux Cutoff-PL 1.35e-01 3.43e-01 4.73e-01 3.54e-01 1.17e+00 1.31e+00 ph/cm2/s
Error 8.05e-02 7.31e-02 7.73e-02 3.13e-01 1.77e-01 3.62e-01 ph/cm2/s
Fluence Band -------- -------- -------- 7.18e-07 -------- 2.48e-06 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 1.542 0.130 - - 1.09e-03 8.61e-05 52.350 57
CPL 0.638 0.617 72.3 28.6 3.21e-03 2.66e-03 44.650 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.742 0.227 - - 1.07e-02 1.49e-03 63.050 57
CPL -0.669 1.461 117.1 157.6 3.96e-02 8.70e-02 58.910 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: 29.184000 sec.
T50 in the 50-300 keV band: 11.136000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 225.408 -1.208 224.200
T90 202.240 0.456 202.696
T50 40.704 5.832 46.536
Peak 1.000 4.276 5.276
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
85.5833 +14.0101 0.0122 12.6 -69.3 4.1775 15.8 TRIG_01104842
------------------------------------------
Foreground time interval of the image:
-1.208 224.200 (delta_t = 225.408 [sec])
Background time interval of the image:
-239.288 -1.208 (delta_t = 238.080 [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 -1.208 sec. to 224.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54210 ( -0.12969 0.13127 )
Norm@50keV : 1.09260E-03 ( -8.63193e-05 8.58135e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.35 using 59 PHA bins.
# Reduced chi-squared = 0.9184 for 57 degrees of freedom
# Null hypothesis probability = 6.500053e-01
Photon flux (15-150 keV) in 225.4 sec: 0.138002 ( -0.0104737 0.0104825 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32106e-06 ( -1.99807e-07 2.0188e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.208 sec. to 224.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.637916 ( -0.659932 0.575014 )
Epeak [keV] : 72.3124 ( -13.5703 43.5574 )
Norm@50keV : 3.21462E-03 ( -0.00157011 0.00374026 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.65 using 59 PHA bins.
# Reduced chi-squared = 0.7973 for 56 degrees of freedom
# Null hypothesis probability = 8.623577e-01
Photon flux (15-150 keV) in 225.4 sec: 0.132330 ( -0.011046 0.011046 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14972e-06 ( -2.20423e-07 2.26157e-07 ) ergs/cm2
Band function
Time interval is from -1.208 sec. to 224.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.642570 ( -0.538893 0.420614 )
beta : -9.36935 ( 9.37145 19.3714 )
Epeak [keV] : 72.4915 ( -11.4975 43.1986 )
Norm@50keV : 3.19478E-03 ( -0.00129877 0.000601892 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.65 using 59 PHA bins.
# Reduced chi-squared = 0.8118 for 55 degrees of freedom
# Null hypothesis probability = 8.394217e-01
Photon flux (15-150 keV) in 225.4 sec: 0.132366 ( ) 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] : 14.1686 (-1.21607 1.34976)
R^2/D10^2 : 1.92546E-02 (-0.00533873 0.00726384)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.36 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.092233e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.838e-07 2.643e-08
25- 50 6.918e-07 6.638e-08
50-150 9.200e-07 1.491e-07
15-150 1.796e-06 1.751e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 187.455 (-62.1615 -189.735)
Norm : 0.565551 (-0.0432234 0.0475035)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.175e-07 8.796e-08
25- 50 6.103e-07 1.694e-07
50-150 1.336e-06 6.687e-07
15-150 2.264e-06 1.015e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.23174 (-2.26024 2.77166)
R1^2/D10^2 : 0.166051 (-0.109761 0.728983)
kT2 [keV] : 19.6394 (-3.45342 7.18659)
R2^2/D10^2 : 4.92798E-03 (-0.00358471 0.00591344)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.867e-07 1.380e-07
25- 50 6.295e-07 2.690e-07
50-150 1.191e-06 5.043e-07
15-150 2.107e-06 8.128e-07
Peak spectrum fit
Power-law model
Time interval is from 4.276 sec. to 5.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.742282 ( -0.233725 0.220316 )
Norm@50keV : 1.06849E-02 ( -0.00150641 0.00148203 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.05 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.710918e-01
Photon flux (15-150 keV) in 1 sec: 1.23144 ( -0.165782 0.166533 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27995e-07 ( -1.74175e-08 1.74916e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.276 sec. to 5.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.668785 ( -1.71759 1.20357 )
Epeak [keV] : 117.062 ( -32.5502 282.735 )
Norm@50keV : 3.95845E-02 ( -0.0395936 0.134367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.91 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.693685e-01
Photon flux (15-150 keV) in 1 sec: 1.16769 ( -0.177149 0.17646 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21783e-07 ( -1.9623e-08 1.9063e-08 ) ergs/cm2
Band function
Time interval is from 4.276 sec. to 5.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.864467 ( 0.86401 0.86401 )
beta : -0.742273 ( -0.220559 0.233317 )
Epeak [keV] : 18.0999 ( -18.1103 -18.1103 )
Norm@50keV : 1.45413E-02 ( -0.00529083 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.05 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 55 degrees of freedom
# Null hypothesis probability = 2.131065e-01
Photon flux (15-150 keV) in 1 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] : 25.3575 (-3.77262 5.00302)
R^2/D10^2 : 3.12850E-02 (-0.0130149 0.0199225)
(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 3.468e-09 9.900e-10
25- 50 1.982e-08 4.475e-09
50-150 9.429e-08 2.077e-08
15-150 1.176e-07 2.281e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-23.8168 -200)
Norm : 4.79335 (-0.694179 0.694179)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.194e-08 6.810e-09
25- 50 2.296e-08 1.283e-08
50-150 5.036e-08 2.831e-08
15-150 8.527e-08 4.761e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.33953 (-2.33302 6.44999)
R1^2/D10^2 : 67.7658 (-68.7801 -68.7801)
kT2 [keV] : 26.2554 (-4.0742 5.5601)
R2^2/D10^2 : 2.78242E-02 (-0.0121507 0.018859)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.826e-09 1.115e-09
25- 50 2.331e-08 4.830e-09
50-150 7.730e-08 1.961e-08
15-150 1.054e-07 2.040e-08
Plot creation:
Mon May 2 16:46:06 EDT 2022