batgrbproduct analysis for trigger=1046782
batgrbproduct Analysis for Trigger=1046782
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): Tue May 4 16:58:26 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1046782/GCN5_download_cron
======================================================================
Trigger: 01046782 Segment: 000
BAT Trigger Time: 641829320 [s; MET]
Trigger Stop: 641829384 [s; MET]
UTC: 2021-05-04T13:54:53.041040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 222.376049651147 Dec: -30.5412476439381 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.45
Flight Position: [ source = BAT ]
RA: 222.376049651147 Dec: -30.5412476439381 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 222.379017864391 Dec: -30.5565253493379 [deg; J2000]
{ 14h 49m 31.0s , -30d 33' 23.5" }
+/- 2.06984308407013 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10573928803394 [arcmin] (formal 1-sigma fit error)
SNR: 10.7591807818723
Angular difference between Flight and Ground position is 0.929405 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 135.05999994278 +/- 9.5711392280678
Measured from: -6.27199983596802
to: 128.788000106812 [s; relative to TRIGTIME]
T50: 66.6200000047684 +/- 18.2850539761707
Measured from: 28.8560000658035
to: 95.4760000705719 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 87.6840000152588
to: 88.6840000152588 [s; relative to TRIGTIME]
Total Fluence
Measured from: -27.5479999780655
to: 134.756000041962 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.453004 1.651232 1.290804 0.163367
0.114448 0.113243 0.099919 0.088874 [error]
Peak 0.031079 0.042014 0.027944 0.003994
0.009232 0.009380 0.008276 0.007454 [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 4.27e-07 7.23e-07 9.31e-07 2.41e-06 2.74e-06 4.49e-06 erg/cm2
Error 5.10e-08 5.37e-08 9.75e-08 5.31e-07 2.31e-07 6.14e-07 erg/cm2
Peak flux Power-law 3.23e-01 2.98e-01 1.91e-01 1.87e-01 8.90e-01 9.99e-01 ph/cm2/s
Error 1.31e-01 7.45e-02 7.00e-02 1.44e-01 2.19e-01 2.52e-01 ph/cm2/s
Fluence Cutoff-PL 3.92e-07 7.67e-07 9.49e-07 1.05e-06 2.61e-06 3.15e-06 erg/cm2
Error 5.97e-08 6.71e-08 1.06e-07 8.15e-07 2.57e-07 8.52e-07 erg/cm2
Peak flux Cutoff-PL 3.31e-01 2.99e-01 1.86e-01 1.77e-01 8.91e-01 9.98e-01 ph/cm2/s
Error 1.32e-01 7.39e-02 7.02e-02 1.82e-01 2.19e-01 2.65e-01 ph/cm2/s
Fluence Band 3.90e-07 7.62e-07 9.47e-07 1.11e-06 2.62e-06 3.24e-06 erg/cm2
Error 5.62e-08 -------- -------- -------- 2.56e-07 -------- 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 1.635 0.131 - - 1.82e-03 1.42e-04 61.430 57
CPL 1.064 0.538 78.3 101.5 3.60e-03 2.52e-03 57.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.646 0.490 - - 6.82e-03 1.89e-03 43.170 57
CPL 2.699 1.079 222.5 0.0 2.02e-03 0.00e+00 42.230 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: 40.768000 sec.
T50 in the 50-300 keV band: 29.312000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 162.304 -27.548 134.756
T90 135.060 -6.272 128.788
T50 66.620 28.856 95.476
Peak 1.000 87.684 88.684
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
222.3790 -30.5565 0.0179 24.3 102.4 2.1371 10.8 TRIG_01046782
------------------------------------------
Foreground time interval of the image:
-13.899 72.101 (delta_t = 86.000 [sec])
Background time interval of the image:
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 -27.548 sec. to 134.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63526 ( -0.130131 0.132282 )
Norm@50keV : 1.81525E-03 ( -0.000142312 0.000141172 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.43 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.20e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 162.3 sec: 0.235888 ( -0.0174696 0.0174886 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74422e-06 ( -2.29601e-07 2.31953e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -27.548 sec. to 134.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06389 ( -0.570378 0.505704 )
Epeak [keV] : 78.3364 ( -19.307 183.778 )
Norm@50keV : 3.60240E-03 ( -0.00160533 0.00343166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.63 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.15e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 162.3 sec: 0.229252 ( -0.018378 0.018384 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61172e-06 ( -2.54957e-07 2.58739e-07 ) ergs/cm2
Band function
Time interval is from -27.548 sec. to 134.756 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06413 ( -0.495745 0.654403 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 78.3375 ( -19.3283 185.106 )
Norm@50keV : 3.60106E-03 ( -0.00160414 0.003434 )
------------------------------------------------------------
Photon flux (15-150 keV) in 162.3 sec: 0.228806 ( 6.77119 -0.017567 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61689e-06 ( -2.61576e-06 -2.62147e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6362 (-1.25182 1.38983)
R^2/D10^2 : 3.62135E-02 (-0.0106251 0.0149937)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 93.42 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.68e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.313e-07 3.141e-08
25- 50 8.379e-07 7.969e-08
50-150 1.012e-06 1.608e-07
15-150 2.081e-06 1.972e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 154.678 (-47.219 -153.651)
Norm : 0.970805 (-0.0780241 0.0960107)
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.34e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.036e-07 4.415e-08
25- 50 7.514e-07 1.432e-07
50-150 1.502e-06 6.697e-07
15-150 2.657e-06 7.685e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.01872 (-1.28641 1.53001)
R1^2/D10^2 : 0.408253 (-0.221953 0.601323)
kT2 [keV] : 21.2269 (-3.43115 5.31808)
R2^2/D10^2 : 5.93723E-03 (-0.00341237 0.00584624)
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.80 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.82e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.020e-07 1.619e-07
25- 50 7.441e-07 2.045e-07
50-150 1.450e-06 5.544e-07
15-150 2.596e-06 6.995e-07
Peak spectrum fit
Power-law model
Time interval is from 87.684 sec. to 88.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64578 ( -0.471849 0.507531 )
Norm@50keV : 6.82166E-03 ( -0.00195363 0.00183486 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.17 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.12e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.889506 ( -0.218514 0.218807 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.34708e-08 ( -1.86174e-08 1.92993e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 87.684 sec. to 88.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.69890 ( -1.94117 0.216557 )
Epeak [keV] : 222.474 ( )
Norm@50keV : 2.02131E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.23 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.13e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.890742 ( -0.219869 0.217628 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.35484e-08 ( -1.87608e-08 1.88886e-08 ) ergs/cm2
Band function
Time interval is from 87.684 sec. to 88.684 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.07532 ( 3.21774 5.07532 )
beta : -1.64575 ( -0.507587 0.471841 )
Epeak [keV] : 185.917 ( -185.917 -185.917 )
Norm@50keV : 0.927166 ( -0.26553 0.249382 )
------------------------------------------------------------
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] : 11.7639 (-4.15571 9.71336)
R^2/D10^2 : 0.218285 (-0.212848 0.861373)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.52 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.80e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.377e-09 3.662e-09
25- 50 1.960e-08 9.510e-09
50-150 1.609e-08 1.026e-08
15-150 4.207e-08 2.546e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 187.811 (-129.527 -186.628)
Norm : 3.57880 (-0.889189 1.39761)
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.76 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.01e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.979e-09 5.240e-09
25- 50 1.715e-08 1.024e-08
50-150 3.686e-08 2.208e-08
15-150 6.299e-08 3.672e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.04139 (-3.40492 3.6482)
R1^2/D10^2 : 1.97158 (-1.63613 3.68432)
kT2 [keV] : 32.2848 (-29.695 147.685)
R2^2/D10^2 : 5.87540E-03 (-0.0054674 0.0279675)
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.59 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.89e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.057e-08 6.140e-09
25- 50 1.558e-08 8.550e-09
50-150 4.233e-08 2.608e-08
15-150 6.848e-08 3.633e-08
Plot creation:
Tue May 4 17:02:32 EDT 2021