batgrbproduct analysis for trigger=1057131
batgrbproduct Analysis for Trigger=1057131
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 Jun 22 21:25:17 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1057131/GCN5_download_cron
======================================================================
Trigger: 01057131 Segment: 000
BAT Trigger Time: 645987904.192 [s; MET]
Trigger Stop: 645987904.2 [s; MET]
UTC: 2021-06-21T17:04:36.955340 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 238.811788597137 Dec: -54.0629637828523 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.63
Image Trigger?: NO
Rate S/N Ratio: 18.6010752377383 [ if not an image trigger ]
Image S/N Ratio: 6.63
Flight Position: [ source = BAT ]
RA: 238.811788597137 Dec: -54.0629637828523 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 238.771531719836 Dec: -54.0856253826296 [deg; J2000]
{ 15h 55m 05.2s , -54d 05' 08.3" }
+/- 2.86931370410081 [arcmin] (estimated 90% radius based on SNR)
+/- 1.7143993335941 [arcmin] (formal 1-sigma fit error)
SNR: 6.74760671939963
Angular difference between Flight and Ground position is 1.963989 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0119999647140503 +/- 0.00894431669225064
Measured from: -0.00399994850158691
to: 0.00800001621246338 [s; relative to TRIGTIME]
T50: 0.00399994850158691 +/- 0.00565686571406321
Measured from: 1.19209289550781e-07
to: 0.00400006771087646 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.49400007724762
to: 0.50599992275238 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400006771087646
to: 0.0119999647140503 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.008092 0.009527 0.001290 -0.001197
0.001644 0.001700 0.001002 0.000671 [error]
Peak 0.006841 0.008480 -0.001836 0.006943
0.007035 0.006724 0.006242 0.005388 [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 1.91e-09 1.73e-09 1.08e-09 1.03e-09 5.16e-09 5.76e-09 erg/cm2
Error 5.93e-10 5.41e-10 6.22e-10 1.26e-09 1.64e-09 2.22e-09 erg/cm2
Peak flux Power-law 9.80e-02 4.86e-02 1.48e-02 5.72e-03 1.65e-01 1.67e-01 ph/cm2/s
Error 8.98e-02 5.04e-02 2.63e-02 2.92e-02 1.49e-01 1.54e-01 ph/cm2/s
Fluence Cutoff-PL 1.68e-09 2.66e-09 5.25e-10 3.77e-12 4.87e-09 4.87e-09 erg/cm2
Error 7.06e-10 9.66e-10 6.06e-10 1.12e-10 1.35e-09 1.35e-09 erg/cm2
Peak flux Cutoff-PL 6.50e-02 9.28e-02 2.02e-03 7.11e-09 1.59e-01 1.60e-01 ph/cm2/s
Error 9.22e-02 8.47e-02 1.27e-02 2.49e-02 1.34e-01 1.34e-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 2.679 0.552 - - 3.05e-02 1.34e-02 51.760 57
CPL -1.410 4.352 28.7 12.9 1.36e+01 2.33e+04 47.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.724 -0.556 - - 7.25e-04 9.90e-04 64.360 57
CPL -9.793 1.047 29.9 22.6 1.40e+05 2.21e+07 63.040 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 0.016 -0.004 0.012
T90 0.012 -0.004 0.008
T50 0.004 0.000 0.004
Peak 1.000 -0.494 0.506
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
238.7715 -54.0856 0.0285 0.0 171.1 0.0172 6.7 TRIG_01057131
------------------------------------------
Foreground time interval of the image:
-0.004 0.012 (delta_t = 0.016 [sec])
Background time interval of the image:
-60.192 -0.004 (delta_t = 60.188 [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 -0.004 sec. to 0.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.67881 ( -0.488924 0.615318 )
Norm@50keV : 3.05123E-02 ( -0.013326 0.0134304 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.76 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.71e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 0.016 sec: 6.71525 ( -1.80967 1.80977 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.15618e-09 ( -1.60088e-09 1.68406e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.41012 ( -5.4983 3.20643 )
Epeak [keV] : 28.6635 ( -19.0875 6.69456 )
Norm@50keV : 13.5743 ( -16.2186 46638.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.21 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.92e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 0.016 sec: 6.75278 ( -1.78221 1.78533 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86717e-09 ( -1.33637e-09 1.35846e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.012 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.70536 ( -3.19263 -1.43437 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 29.3435 ( -5.99461 5.83307 )
Norm@50keV : 20.1346 ( -17.0125 2499.55 )
------------------------------------------------------------
Photon flux (15-150 keV) in 0.016 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] : 7.45859 (-1.52342 1.51871)
R^2/D10^2 : 11.2155 (-6.245 16.9727)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.10 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.22e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.705e-09 7.829e-10
25- 50 2.632e-09 1.220e-09
50-150 5.458e-10 4.256e-10
15-150 4.883e-09 2.156e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.1375 (-9.70915 16.7965)
Norm : 64.2158 (-26.2405 45.0011)
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.31 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.56e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.935e-09 7.026e-10
25- 50 2.040e-09 8.490e-10
50-150 9.252e-10 6.966e-10
15-150 4.900e-09 2.290e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.809103 (-0.799458 3.28617)
R1^2/D10^2 : 7.23535E+07 (-1.06665e+08 1.58506e+13)
kT2 [keV] : 7.62755 (-1.5539 1.58299)
R2^2/D10^2 : 9.97159 (-5.88447 14.4847)
------------------------------------------------------------
#Fit statistic : Chi-Squared 46.42 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.88e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.672e-09 9.936e-10
25- 50 2.600e-09 1.565e-09
50-150 5.820e-10 4.575e-10
15-150 4.854e-09 2.862e-09
Peak spectrum fit
Power-law model
Time interval is from -0.494 sec. to 0.506 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.72442 ( -1.58776 -2.70032 )
Norm@50keV : 7.24560E-04 ( -0.000726425 0.00125396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.36 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.35e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.164526 ( -0.148691 0.149676 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.73386e-09 ( -7.8907e-09 1.03254e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.494 sec. to 0.506 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.79336 ( 9.83446 11.9288 )
Epeak [keV] : 29.8925 ( -11.542 33.6345 )
Norm@50keV : 1.40317E+05 ( -168160 4.3972e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.04 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.41e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.158554 0.157290 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10462e-09 ( -5.3179e-09 8.19638e-09 ) ergs/cm2
Band function
Time interval is from -0.494 sec. to 0.506 sec.
Parameter 3 is pegged at 6.88905 due to zero or negative pivot element, likely
caused by the fit being insensitive to the parameter.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.86464 ( -6.85619 -4.86464 )
beta : -9.37155 ( 9.37155 19.354 )
Epeak [keV] : 29.3110 ( -14.16 20.5382 )
Norm@50keV : 78.5042 ( )
------------------------------------------------------------
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] : 7.22059 (-4.34171 7.65669)
R^2/D10^2 : 0.332522 (-0.330754 16.6594)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.33 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.63e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.873e-09 1.989e-09
25- 50 4.175e-09 3.211e-09
50-150 7.731e-10 7.325e-10
15-150 7.821e-09 5.285e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.8611 (-25.3038 -25.3038)
Norm : 1.64806 (-1.65252 65.2105)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.84 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.49e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.084e-09 2.314e-09
25- 50 3.229e-09 2.499e-09
50-150 1.442e-09 1.526e-09
15-150 7.756e-09 6.545e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.423538 (-7.24612 -7.24612)
R1^2/D10^2 : 2.56399E+12 (-2.90894e+12 4.09925e+16)
kT2 [keV] : 7.54452 (-4.42966 8.91973)
R2^2/D10^2 : 0.266293 (-0.259467 11.3364)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.15 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.11e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.876e-09 6.335e-02
25- 50 4.178e-09 5.275e-01
50-150 7.730e-10 1.355e+01
15-150 7.827e-09 1.331e+01
Plot creation:
Tue Jun 22 21:33:31 EDT 2021