batgrbproduct analysis for trigger=1056757
batgrbproduct Analysis for Trigger=1056757
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 Jun 21 00:05:51 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1056757/GCN5_download_cron
======================================================================
Trigger: 01056757 Segment: 000
BAT Trigger Time: 645839992.896 [s; MET]
Trigger Stop: 645839992.96 [s; MET]
UTC: 2021-06-19T23:59:25.669220 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 319.712963521213 Dec: 33.8598882356361 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.13
Image Trigger?: NO
Rate S/N Ratio: 67.0223843204642 [ if not an image trigger ]
Image S/N Ratio: 8.13
Flight Position: [ source = BAT ]
RA: 319.712963521213 Dec: 33.8598882356361 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 319.718113489377 Dec: 33.849599640428 [deg; J2000]
{ 21h 18m 52.3s , +33d 50' 58.6" }
+/- 0.68757557500639 [arcmin] (estimated 90% radius based on SNR)
+/- 0.170804344490973 [arcmin] (formal 1-sigma fit error)
SNR: 51.9418902696501
Angular difference between Flight and Ground position is 0.668526 arcmin
Partial Coding Fraction: 0.3671875 [ including projection effects ]
Duration
T90: 60.9039999246597 +/- 0.277416676632932
Measured from: 0.748000144958496
to: 61.6520000696182 [s; relative to TRIGTIME]
T50: 44.743999838829 +/- 0.0894426338007676
Measured from: 2.86800014972687
to: 47.6119999885559 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.952000021934509
to: 1.95200002193451 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.248000025749207
to: 105.375999927521 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 32.391312 49.644257 43.372633 12.825167
0.177034 0.211491 0.206396 0.156273 [error]
Peak 2.215730 4.561690 5.391155 2.032349
0.044305 0.062086 0.070530 0.053990 [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 1.15e-05 2.24e-05 3.38e-05 1.10e-04 9.49e-05 1.78e-04 erg/cm2
Error 3.20e-07 3.77e-07 3.80e-07 2.82e-06 1.07e-06 2.83e-06 erg/cm2
Peak flux Power-law 2.46e+01 3.42e+01 3.53e+01 6.66e+01 1.15e+02 1.61e+02 ph/cm2/s
Error 9.84e-01 8.32e-01 6.41e-01 2.66e+00 2.17e+00 3.02e+00 ph/cm2/s
Fluence Cutoff-PL 1.09e-05 2.24e-05 3.45e-05 9.52e-05 9.45e-05 1.63e-04 erg/cm2
Error 4.61e-07 3.84e-07 5.27e-07 7.41e-06 1.09e-06 7.44e-06 erg/cm2
Peak flux Cutoff-PL 2.23e+01 3.44e+01 3.67e+01 5.18e+01 1.14e+02 1.45e+02 ph/cm2/s
Error 1.34e+00 8.59e-01 8.79e-01 5.67e+00 2.26e+00 6.21e+00 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 1.409 0.021 - - 9.32e-02 1.17e-03 49.900 57
CPL 1.248 0.087 313.1 175.5 1.07e-01 7.83e-03 39.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.956 0.032 - - 1.00e+00 1.85e-02 65.420 57
CPL 0.659 0.133 284.4 117.9 1.32e+00 1.60e-01 50.120 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: 57.472000 sec.
T50 in the 50-300 keV band: 39.360000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 105.624 -0.248 105.376
T90 60.904 0.748 61.652
T50 44.744 2.868 47.612
Peak 1.000 0.952 1.952
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
319.7181 +33.8496 0.0037 35.9 -58.5 56.1175 51.9 TRIG_01056757
------------------------------------------
Foreground time interval of the image:
-0.248 8.405 (delta_t = 8.653 [sec])
Background time interval of the image:
-239.896 -46.075 (delta_t = 193.821 [sec])
-44.896 -0.248 (delta_t = 44.648 [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 -0.248 sec. to 105.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40917 ( -0.0208417 0.020757 )
Norm@50keV : 9.31702E-02 ( -0.00117474 0.00117224 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.90 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.36e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 105.6 sec: 11.3703 ( -0.175417 0.175901 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.48923e-05 ( -1.06721e-06 1.06732e-06 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.248 sec. to 105.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24827 ( -0.087428 0.085964 )
Epeak [keV] : 313.079 ( -85.3487 265.626 )
Norm@50keV : 0.106998 ( -0.00749427 0.00815735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 39.66 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.52e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 105.6 sec: 11.1814 ( -0.1978 0.1992 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.45341e-05 ( -1.08694e-06 1.08705e-06 ) ergs/cm2
Band function
Time interval is from -0.248 sec. to 105.376 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834196 ( -0.382674 0.805395 )
beta : -1.45441 ( 1.45457 0.0341283 )
Epeak [keV] : 88.4485 ( -36.3103 387.876 )
Norm@50keV : 0.184768 ( -0.10194 0.44907 )
------------------------------------------------------------
Photon flux (15-150 keV) in 105.6 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] : 22.5115 ( )
R^2/D10^2 : 0.315946 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 1603.87 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.99e-298 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.096e-06 7.656e-08
25- 50 1.659e-05 3.379e-07
50-150 6.283e-05 8.395e-07
15-150 8.252e-05 9.293e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 50.0785 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 412.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.94e-55 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.317e-05 1.795e-07
25- 50 2.533e-05 3.696e-07
50-150 5.556e-05 7.762e-07
15-150 9.405e-05 1.362e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.98461 (-0.402479 0.416787)
R1^2/D10^2 : 4.57367 (-0.650198 0.784068)
kT2 [keV] : 34.2445 (-1.31425 1.49166)
R2^2/D10^2 : 6.19170E-02 (-0.00867704 0.00936633)
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.38 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.19e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.686e-06 4.055e-07
25- 50 2.323e-05 4.858e-07
50-150 6.167e-05 1.051e-06
15-150 9.359e-05 1.368e-06
Peak spectrum fit
Power-law model
Time interval is from 0.952 sec. to 1.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.956364 ( -0.0317471 0.0316162 )
Norm@50keV : 1.00306 ( -0.0185319 0.0184989 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 65.42 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.08e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 115.265 ( -2.16893 2.17082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10192e-05 ( -2.02466e-07 2.02322e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.952 sec. to 1.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.658938 ( -0.135309 0.131576 )
Epeak [keV] : 284.430 ( -68.516 167.251 )
Norm@50keV : 1.32188 ( -0.148722 0.171781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.96e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 113.686 ( -2.255 2.26 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09546e-05 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.952 sec. to 1.952 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99992 ( -0.0143394 -4.99992 )
beta : -0.974002 ( -0.0329874 0.0330371 )
Epeak [keV] : 27.5736 ( -6.02444 3.95092 )
Norm@50keV : 3.58617E+04 ( -625.9 117824 )
------------------------------------------------------------
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] : 24.4493 ( )
R^2/D10^2 : 3.04119 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 465.16 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.33e-65 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.195e-07 1.205e-08
25- 50 1.792e-06 5.000e-08
50-150 7.966e-06 1.975e-07
15-150 1.008e-05 2.005e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 485.665 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 1070.73 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.27e-187 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.209e-06 2.400e-08
25- 50 2.326e-06 4.550e-08
50-150 5.102e-06 9.750e-08
15-150 8.638e-06 1.735e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1095 (-0.896489 0.959819)
R1^2/D10^2 : 23.8647 (-5.14634 7.14259)
kT2 [keV] : 39.5531 (-3.12067 4.12529)
R2^2/D10^2 : 0.585854 (-0.154931 0.175971)
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.02 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.69e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.178e-07 4.300e-08
25- 50 2.069e-06 9.000e-08
50-150 8.318e-06 3.825e-07
15-150 1.101e-05 4.800e-07
Plot creation:
Mon Jun 21 00:11:14 EDT 2021