batgrbproduct analysis for trigger=1048618
batgrbproduct Analysis for Trigger=1048618
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): Sat May 15 19:23:20 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1048618/GCN5_download_cron
======================================================================
Trigger: 01048618 Segment: 000
BAT Trigger Time: 642801721.984 [s; MET]
Trigger Stop: 642801724.032 [s; MET]
UTC: 2021-05-15T20:01:34.960160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 1.0503397560906 Dec: -15.0106404456402 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.28
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 7.28
Flight Position: [ source = BAT ]
RA: 1.0503397560906 Dec: -15.0106404456402 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 1.10600335869738 Dec: -14.9717159221241 [deg; J2000]
{ 00h 04m 25.4s , -14d 58' 18.2" }
+/- 1.9538105268008 [arcmin] (estimated 90% radius based on SNR)
+/- 0.71839359693833 [arcmin] (formal 1-sigma fit error)
SNR: 11.6834748958172
Angular difference between Flight and Ground position is 3.982770 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 55.7120000123978 +/- 26.7421703737101
Measured from: -1.80799984931946
to: 53.9040001630783 [s; relative to TRIGTIME]
T50: 15.8720000982285 +/- 16.8121632171357
Measured from: 1.34400010108948
to: 17.2160001993179 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.836000084877014
to: 1.83600008487701 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.52799999713898
to: 56.8960000276566 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.177031 0.408403 0.255169 0.080945
0.049553 0.051542 0.046623 0.043030 [error]
Peak 0.008424 0.034370 0.026442 0.024813
0.006581 0.007075 0.006523 0.005867 [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 6.03e-08 1.28e-07 2.14e-07 8.13e-07 5.89e-07 1.22e-06 erg/cm2
Error 1.74e-08 2.25e-08 4.40e-08 3.71e-07 1.10e-07 4.02e-07 erg/cm2
Peak flux Power-law 1.13e-01 1.77e-01 2.09e-01 4.78e-01 6.37e-01 9.76e-01 ph/cm2/s
Error 6.13e-02 5.83e-02 4.89e-02 2.65e-01 1.52e-01 2.70e-01 ph/cm2/s
Fluence Cutoff-PL 5.58e-08 1.34e-07 2.21e-07 4.18e-07 5.68e-07 8.29e-07 erg/cm2
Error 2.04e-08 2.72e-08 4.85e-08 4.62e-07 1.22e-07 5.63e-07 erg/cm2
Peak flux Cutoff-PL 1.12e-01 1.76e-01 2.09e-01 4.78e-01 6.37e-01 9.75e-01 ph/cm2/s
Error 6.79e-02 5.96e-02 5.55e-02 3.41e-01 1.53e-01 3.35e-01 ph/cm2/s
Fluence Band 5.44e-08 1.37e-07 2.12e-07 6.75e-07 5.74e-07 1.08e-06 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 1.262 0.284 - - 9.94e-04 1.62e-04 53.730 57
CPL 0.814 1.024 134.8 0.0 1.66e-03 2.63e-03 53.240 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.760 0.443 - - 5.54e-03 1.37e-03 50.960 57
CPL 2.338 2.898 98.7 0.0 7.88e-05 0.00e+00 49.810 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: 9.024000 sec.
T50 in the 50-300 keV band: 4.928000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 59.424 -2.528 56.896
T90 55.712 -1.808 53.904
T50 15.872 1.344 17.216
Peak 1.000 0.836 1.836
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
1.1060 -14.9717 0.0164 7.1 -168.8 0.8705 11.7 TRIG_01048618
------------------------------------------
Foreground time interval of the image:
-2.528 26.917 (delta_t = 29.445 [sec])
Background time interval of the image:
-239.984 -48.454 (delta_t = 191.530 [sec])
-46.984 -2.528 (delta_t = 44.456 [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 -2.528 sec. to 56.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26206 ( -0.285784 0.283167 )
Norm@50keV : 9.93770E-04 ( -0.000162159 0.000161655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.73 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.99e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 59.42 sec: 0.117770 ( -0.0192154 0.0192395 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.89114e-07 ( -1.08999e-07 1.11177e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.528 sec. to 56.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.814268 ( -1.34757 0.701287 )
Epeak [keV] : 134.833 ( -134.833 -134.833 )
Norm@50keV : 1.66084E-03 ( -0.000810084 0.0044415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.24 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.80e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 59.42 sec: 0.115445 ( -0.0201647 0.020025 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67596e-07 ( -1.21801e-07 1.22074e-07 ) ergs/cm2
Band function
Time interval is from -2.528 sec. to 56.896 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.811954 ( 0.603522 0.603522 )
beta : -1.90048 ( 1.88534 11.7367 )
Epeak [keV] : 134.153 ( -134.12 -134.12 )
Norm@50keV : 1.66591E-03 ( -0.000626223 0 )
------------------------------------------------------------
Photon flux (15-150 keV) in 59.42 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.73742e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.1371 (-3.38855 4.43482)
R^2/D10^2 : 8.87283E-03 (-0.00473163 0.00972031)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.86e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.146e-08 9.534e-09
25- 50 1.401e-07 3.675e-08
50-150 2.945e-07 1.060e-07
15-150 4.661e-07 1.178e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-66.2218 -200)
Norm : 0.481895 (-0.0786409 0.0786409)
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.12e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.130e-08 4.097e-08
25- 50 1.372e-07 7.829e-08
50-150 3.008e-07 1.714e-07
15-150 5.093e-07 2.882e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.66507 (-4.44184 6.09844)
R1^2/D10^2 : 7.16416E-02 (-0.0580929 1.73221)
kT2 [keV] : 27.5478 (-9.69538 -27.5895)
R2^2/D10^2 : 1.46332E-03 (-0.00145811 0.00560819)
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.04 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.50e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.459e-08 3.212e-08
25- 50 1.355e-07 7.338e-08
50-150 3.723e-07 2.216e-07
15-150 5.624e-07 2.858e-07
Peak spectrum fit
Power-law model
Time interval is from 0.836 sec. to 1.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.759516 ( -0.470716 0.415059 )
Norm@50keV : 5.53513E-03 ( -0.00140366 0.00134386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.96 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.00e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.637312 ( -0.151084 0.152187 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.58102e-08 ( -1.59587e-08 1.61223e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.836 sec. to 1.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33800 ( -0.254674 5.54068 )
Epeak [keV] : 98.6747 ( )
Norm@50keV : 7.88120E-05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.81 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.07e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.636547 ( -0.154215 0.152628 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.58163e-08 ( -1.66004e-08 1.60964e-08 ) ergs/cm2
Band function
Time interval is from 0.836 sec. to 1.836 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.922536 ( 0.922534 0.922534 )
beta : -0.759516 ( -0.414704 0.471335 )
Epeak [keV] : 17.5136 ( -17.5136 -17.5136 )
Norm@50keV : 7.48806E-03 ( -0.00331201 0 )
------------------------------------------------------------
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] : 29.0609 (-9.13596 17.3354)
R^2/D10^2 : 1.03321E-02 (-0.00735947 0.0212433)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.41 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.73e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.392e-09 8.017e-10
25- 50 8.472e-09 4.726e-09
50-150 5.114e-08 3.009e-08
15-150 6.100e-08 3.346e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-63.4904 -200)
Norm : 2.51877 (-0.631154 0.631154)
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.51 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.50e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.275e-09 3.789e-09
25- 50 1.207e-08 7.150e-09
50-150 2.647e-08 1.573e-08
15-150 4.482e-08 2.654e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.10781 (-3.7712 7.80051)
R1^2/D10^2 : 0.202741 (-0.179174 1.23297)
kT2 [keV] : 51.3301 (-45.8797 -50.7632)
R2^2/D10^2 : 1.91183E-03 (-0.00188765 0.00683992)
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.66 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.78e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.833e-09 2.278e-09
25- 50 1.105e-08 6.160e-09
50-150 5.191e-08 2.843e-08
15-150 6.679e-08 3.505e-08
Plot creation:
Sat May 15 19:26:31 EDT 2021