batgrbproduct analysis for trigger=1048783
batgrbproduct Analysis for Trigger=1048783
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 17 08:59:12 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1048783/GCN5_download_cron
======================================================================
Trigger: 01048783 Segment: 000
BAT Trigger Time: 642922108.608 [s; MET]
Trigger Stop: 642922109.12 [s; MET]
UTC: 2021-05-17T05:28:01.576120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 358.174322965366 Dec: -39.1049197741364 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.47
Image Trigger?: NO
Rate S/N Ratio: 19.5192212959431 [ if not an image trigger ]
Image S/N Ratio: 8.47
Flight Position: [ source = BAT ]
RA: 358.174322965366 Dec: -39.1049197741364 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 358.18567499036 Dec: -39.1002141567639 [deg; J2000]
{ 23h 52m 44.6s , -39d 06' 00.8" }
+/- 2.06518827559364 [arcmin] (estimated 90% radius based on SNR)
+/- 0.933630410389746 [arcmin] (formal 1-sigma fit error)
SNR: 10.7938411322391
Angular difference between Flight and Ground position is 0.599243 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 3.08799993991852 +/- 1.40911316882699
Measured from: -0.111999869346619
to: 2.9760000705719 [s; relative to TRIGTIME]
T50: 0.976000070571899 +/- 0.329848476648913
Measured from: 0.192000031471252
to: 1.16800010204315 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.156000018119812
to: 0.843999981880188 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.160000085830688
to: 3.12000000476837 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.113733 0.116614 0.059914 0.011886
0.014172 0.014684 0.011799 0.010031 [error]
Peak 0.062706 0.083497 0.034262 0.012412
0.008655 0.009102 0.007292 0.005816 [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 2.95e-08 4.32e-08 4.73e-08 9.71e-08 1.50e-07 2.17e-07 erg/cm2
Error 5.94e-09 6.27e-09 1.11e-08 4.49e-08 2.62e-08 5.72e-08 erg/cm2
Peak flux Power-law 5.89e-01 5.00e-01 2.89e-01 2.49e-01 1.49e+00 1.63e+00 ph/cm2/s
Error 1.15e-01 6.86e-02 5.75e-02 9.27e-02 2.04e-01 2.27e-01 ph/cm2/s
Fluence Cutoff-PL 2.79e-08 4.81e-08 4.54e-08 2.54e-08 1.38e-07 1.47e-07 erg/cm2
Error 6.44e-09 8.92e-09 1.38e-08 5.71e-08 2.91e-08 6.68e-08 erg/cm2
Peak flux Cutoff-PL 4.59e-01 6.42e-01 2.82e-01 2.54e-02 1.41e+00 1.41e+00 ph/cm2/s
Error 1.41e-01 1.08e-01 7.70e-02 4.52e-02 2.09e-01 2.11e-01 ph/cm2/s
Fluence Band 2.74e-08 4.97e-08 4.25e-08 6.05e-08 1.42e-07 1.80e-07 erg/cm2
Error 8.84e-09 9.71e-09 -------- -------- 2.79e-08 -------- 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 1.870 0.255 - - 4.96e-03 8.67e-04 66.860 57
CPL 1.048 1.195 47.6 -8.2 1.51e-02 5.42e-02 64.890 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.790 0.223 - - 1.08e-02 1.69e-03 65.120 57
CPL -0.586 1.679 46.0 8.1 2.43e-01 1.50e+00 55.450 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 3.280 -0.160 3.120
T90 3.088 -0.112 2.976
T50 0.976 0.192 1.168
Peak 1.000 -0.156 0.844
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
358.1857 -39.1002 0.0177 17.7 59.1 0.3059 10.8 TRIG_01048783
------------------------------------------
Foreground time interval of the image:
-0.160 3.120 (delta_t = 3.280 [sec])
Background time interval of the image:
-60.608 -0.160 (delta_t = 60.448 [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 -0.160 sec. to 3.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87015 ( -0.247551 0.262376 )
Norm@50keV : 4.96353E-03 ( -0.000878063 0.000856455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.86 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.74e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 3.28 sec: 0.703463 ( -0.101869 0.101881 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49669e-07 ( -2.58266e-08 2.65374e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.160 sec. to 3.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04839 ( -1.4074 0.982764 )
Epeak [keV] : 47.6283 ( -31.1683 -47.6283 )
Norm@50keV : 1.50815E-02 ( -0.0150815 0.0933104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.89 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.94e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 3.28 sec: 0.687664 ( -0.103273 0.103449 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37678e-07 ( -2.81335e-08 3.00294e-08 ) ergs/cm2
Band function
Time interval is from -0.160 sec. to 3.120 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06226 ( -1.30875 2.08771 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 47.6744 ( -33.0445 -47.6746 )
Norm@50keV : 1.48192E-02 ( -0.0148191 0.0937851 )
------------------------------------------------------------
Photon flux (15-150 keV) in 3.28 sec: 0.697153 ( 6.30285 -0.116756 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41723e-07 ( -1.417e-07 -2.68973e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.87129 (-1.5235 1.88344)
R^2/D10^2 : 0.357071 (-0.173929 0.319027)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 71.81 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.95e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.314e-08 6.268e-09
25- 50 5.648e-08 1.104e-08
50-150 2.839e-08 1.153e-08
15-150 1.080e-07 2.449e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.7205 (-28.9774 64.0173)
Norm : 3.35924 (-0.653848 0.832897)
------------------------------------------------------------
#Fit statistic : Chi-Squared 65.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.18e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.856e-08 5.955e-09
25- 50 4.683e-08 8.036e-09
50-150 6.539e-08 3.328e-08
15-150 1.408e-07 3.993e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.94740 (-2.04579 2.06965)
R1^2/D10^2 : 1.01352 (-0.589613 0.828694)
kT2 [keV] : 23.8742 (-9.88871 34.0041)
R2^2/D10^2 : 7.80379E-03 (-0.00703438 0.0345683)
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.87 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.18e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.817e-08 1.589e-08
25- 50 4.889e-08 2.624e-08
50-150 6.663e-08 4.105e-08
15-150 1.437e-07 7.708e-08
Peak spectrum fit
Power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78994 ( -0.217586 0.22882 )
Norm@50keV : 1.08365E-02 ( -0.00170722 0.00167749 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 65.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.15e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.48745 ( -0.204202 0.204252 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.98045e-08 ( -1.58392e-08 1.61454e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.586476 ( -1.93064 1.42724 )
Epeak [keV] : 45.9817 ( -6.42974 9.78297 )
Norm@50keV : 0.242926 ( -0.247578 2.75986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.45 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.96e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.40633 ( -0.20811 0.20891 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.51526e-08 ( -1.43828e-08 1.64694e-08 ) ergs/cm2
Band function
Time interval is from -0.156 sec. to 0.844 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.742061 ( -1.64121 2.52891 )
beta : -3.58363 ( 3.58932 1.36283 )
Epeak [keV] : 45.1273 ( -9.36587 8.68552 )
Norm@50keV : 0.303807 ( -0.301979 13.7026 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7862e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4564 (-1.35709 1.55384)
R^2/D10^2 : 0.467224 (-0.179268 0.279937)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.08e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.290e-08 3.371e-09
25- 50 3.840e-08 6.530e-09
50-150 2.934e-08 8.820e-09
15-150 8.065e-08 1.503e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 89.8185 (-30.4204 64.3695)
Norm : 6.91462 (-1.19802 1.4544)
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.65 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.46e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.804e-08 3.345e-09
25- 50 3.050e-08 5.580e-09
50-150 4.639e-08 2.241e-08
15-150 9.493e-08 3.011e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.09758 (-1.87113 34.4611)
R1^2/D10^2 : 1.21236E+05 (-121138 -121138)
kT2 [keV] : 11.7643 (-0.78914 -11.7645)
R2^2/D10^2 : 0.415608 (-0.415592 0.17945)
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.32 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.00e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.420e-08 4.472e-09
25- 50 3.681e-08 9.665e-09
50-150 3.124e-08 1.056e-08
15-150 8.225e-08 1.639e-08
Plot creation:
Mon May 17 09:01:54 EDT 2021