batgrbproduct analysis for trigger=1102281
batgrbproduct Analysis for Trigger=1102281
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 Apr 13 16:27:18 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1102281/GCN5_download_cron
======================================================================
Trigger: 01102281 Segment: 000
BAT Trigger Time: 671438239.168 [s; MET]
Trigger Stop: 671438247.36 [s; MET]
UTC: 2022-04-12T06:36:50.220220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 123.968083384208 Dec: 30.3220864406175 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.2
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 7.2
Flight Position: [ source = BAT ]
RA: 123.968083384208 Dec: 30.3220864406175 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 123.974993466069 Dec: 30.3356832079264 [deg; J2000]
{ 08h 15m 54.0s , +30d 20' 08.5" }
+/- 1.94430849547545 [arcmin] (estimated 90% radius based on SNR)
+/- 0.794168162547211 [arcmin] (formal 1-sigma fit error)
SNR: 11.7651292639426
Angular difference between Flight and Ground position is 0.890845 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 41.6599999666214 +/- 6.99508914159456
Measured from: -7.95199990272522
to: 33.7080000638962 [s; relative to TRIGTIME]
T50: 21.1319998502731 +/- 6.06146645798245
Measured from: 0.440000176429749
to: 21.5720000267029 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.87600004673004
to: 7.87600004673004 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.0720000267029
to: 38 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.231749 0.449268 0.253448 0.054492
0.042252 0.043468 0.037807 0.032649 [error]
Peak 0.019191 0.024928 0.017605 0.006125
0.006250 0.006390 0.005508 0.004631 [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 8.16e-08 1.48e-07 2.05e-07 5.95e-07 5.90e-07 1.03e-06 erg/cm2
Error 1.62e-08 1.89e-08 3.57e-08 2.14e-07 8.66e-08 2.46e-07 erg/cm2
Peak flux Power-law 1.74e-01 1.75e-01 1.24e-01 1.40e-01 5.28e-01 6.13e-01 ph/cm2/s
Error 7.92e-02 4.95e-02 4.49e-02 1.07e-01 1.42e-01 1.70e-01 ph/cm2/s
Fluence Cutoff-PL 7.07e-08 1.67e-07 2.10e-07 1.39e-07 5.36e-07 5.87e-07 erg/cm2
Error 1.89e-08 2.59e-08 4.20e-08 2.30e-07 9.57e-08 2.29e-07 erg/cm2
Peak flux Cutoff-PL 1.76e-01 1.76e-01 1.23e-01 1.36e-01 5.29e-01 6.12e-01 ph/cm2/s
Error 8.42e-02 5.34e-02 4.60e-02 1.35e-01 1.42e-01 1.84e-01 ph/cm2/s
Fluence Band 6.97e-08 1.66e-07 2.11e-07 1.61e-07 5.36e-07 6.15e-07 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 1.525 0.212 - - 1.27e-03 1.69e-04 60.640 57
CPL 0.432 1.074 66.7 62.2 4.87e-03 1.08e-02 56.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.498 0.503 - - 4.23e-03 1.20e-03 56.150 57
CPL 1.492 0.000 9999.3 0.0 4.26e-03 0.00e+00 56.150 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: 15.552000 sec.
T50 in the 50-300 keV band: 6.848000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.072 -11.072 38.000
T90 41.660 -7.952 33.708
T50 21.132 0.440 21.572
Peak 1.000 6.876 7.876
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
123.9750 +30.3357 0.0164 16.4 29.7 1.0256 11.8 TRIG_01102281
------------------------------------------
Foreground time interval of the image:
-11.072 38.000 (delta_t = 49.072 [sec])
Background time interval of the image:
-239.168 -191.358 (delta_t = 47.810 [sec])
-190.168 -11.072 (delta_t = 179.096 [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 -11.072 sec. to 38.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52540 ( -0.210286 0.214611 )
Norm@50keV : 1.27229E-03 ( -0.000170358 0.000168617 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.459605e-01
Photon flux (15-150 keV) in 49.07 sec: 0.159942 ( -0.0202287 0.0202417 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.89875e-07 ( -8.58092e-08 8.7378e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.072 sec. to 38.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.431997 ( -1.213 0.934059 )
Epeak [keV] : 66.7423 ( -16.0118 108.474 )
Norm@50keV : 4.86879E-03 ( -0.00486879 0.0166458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.53 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 56 degrees of freedom
# Null hypothesis probability = 4.550708e-01
Photon flux (15-150 keV) in 49.07 sec: 0.153340 ( -0.021019 0.021016 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35859e-07 ( -9.33567e-08 9.80909e-08 ) ergs/cm2
Band function
Time interval is from -11.072 sec. to 38.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.431871 ( -0.931402 1.05423 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 66.7286 ( -14.3461 108.479 )
Norm@50keV : 4.86971E-03 ( -0.00486971 0.0166672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.53 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.176312e-01
Photon flux (15-150 keV) in 49.07 sec: 0.154127 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36477e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5168 (-1.85496 2.23068)
R^2/D10^2 : 2.68411E-02 (-0.0112748 0.0185991)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.56 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.855384e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.097e-08 1.208e-08
25- 50 1.829e-07 3.312e-08
50-150 2.160e-07 5.923e-08
15-150 4.499e-07 8.281e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 191.297 (-83.9627 -187.245)
Norm : 0.657948 (-0.0833582 0.0940024)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.082e-08 4.475e-08
25- 50 1.547e-07 8.288e-08
50-150 3.346e-07 1.844e-07
15-150 5.701e-07 3.091e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.36045 (-4.57751 3.80457)
R1^2/D10^2 : 8.71901E-02 (-0.0524527 0.742648)
kT2 [keV] : 23.3005 (-19.9971 114.319)
R2^2/D10^2 : 2.55005E-03 (-0.00225432 0.0147754)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.800e-08 3.891e-08
25- 50 1.721e-07 8.896e-08
50-150 3.029e-07 1.785e-07
15-150 5.429e-07 2.738e-07
Peak spectrum fit
Power-law model
Time interval is from 6.876 sec. to 7.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49791 ( -0.496326 0.508911 )
Norm@50keV : 4.23488E-03 ( -0.00121931 0.00117772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 0.9851 for 57 degrees of freedom
# Null hypothesis probability = 5.069042e-01
Photon flux (15-150 keV) in 1 sec: 0.528384 ( -0.142296 0.142512 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01883e-08 ( -1.24152e-08 1.28246e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.876 sec. to 7.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49191 ( )
Epeak [keV] : 9999.28 ( )
Norm@50keV : 4.26163E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.691188e-01
Photon flux (15-150 keV) in 1 sec: 0.528787 ( -0.142826 0.141367 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99811e-08 ( -1.2968e-08 1.28951e-08 ) ergs/cm2
Band function
Time interval is from 6.876 sec. to 7.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21768 ( 1.21768 1.21768 )
beta : -1.49788 ( 1.49788 0.496313 )
Epeak [keV] : 28.1462 ( -28.1152 -28.1152 )
Norm@50keV : 8.77822E-03 ( -0.00877962 0.155051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.315085e-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] : 15.4499 (-5.102 7.60858)
R^2/D10^2 : 5.30513E-02 (-0.0527999 0.161022)
(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 2.637e-09 1.515e-09
25- 50 1.076e-08 6.435e-09
50-150 1.771e-08 1.127e-08
15-150 3.111e-08 1.714e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.15546 (-0.576068 0.576266)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.367e-09 3.310e-09
25- 50 1.032e-08 6.315e-09
50-150 2.264e-08 1.383e-08
15-150 3.834e-08 2.316e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08641 (-3.08438 7.24122)
R1^2/D10^2 : 1.85138 (-1.71223 216.958)
kT2 [keV] : 23.5793 (-9.30865 -23.5842)
R2^2/D10^2 : 1.05651E-02 (-0.010504 0.0395843)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.871e-09 3.594e-09
25- 50 9.067e-09 4.868e-09
50-150 2.414e-08 1.501e-08
15-150 3.908e-08 2.112e-08
Plot creation:
Wed Apr 13 16:39:00 EDT 2022