batgrbproduct analysis for trigger=1152764
batgrbproduct Analysis for Trigger=1152764
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): Sun Feb 5 21:35:20 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1152764/batgroup_hand_proc
======================================================================
Trigger: 01152764 Segment: 000
BAT Trigger Time: 697285821.888 [s; MET]
Trigger Stop: 697285824.96 [s; MET]
UTC: 2023-02-05T10:29:51.184520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 202.072208101792 Dec: 46.6836265763065 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.58
Image Trigger?: NO
Rate S/N Ratio: 15.1657508881031 [ if not an image trigger ]
Image S/N Ratio: 6.58
Flight Position: [ source = BAT ]
RA: 202.072208101792 Dec: 46.6836265763065 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 202.057051780186 Dec: 46.6855823698498 [deg; J2000]
{ 13h 28m 13.7s , +46d 41' 08.1" }
+/- 2.32910945096139 [arcmin] (estimated 90% radius based on SNR)
+/- 1.25094237053151 [arcmin] (formal 1-sigma fit error)
SNR: 9.08994767642737
Angular difference between Flight and Ground position is 0.634788 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 2.29999995231628 +/- 0.355105682948718
Measured from: 0.455999970436096
to: 2.75599992275238 [s; relative to TRIGTIME]
T50: 1.32799994945526 +/- 0.424867052812541
Measured from: 0.983999967575073
to: 2.31199991703033 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.74399995803833
to: 2.74399995803833 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.315999984741211
to: 2.87199997901917 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.073330 0.094789 0.072597 0.028195
0.014746 0.015528 0.013945 0.011427 [error]
Peak 0.046928 0.039507 0.032705 0.007689
0.009455 0.010307 0.008960 0.007189 [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 2.01e-08 3.83e-08 5.65e-08 1.79e-07 1.60e-07 2.94e-07 erg/cm2
Error 5.50e-09 6.64e-09 1.31e-08 8.82e-08 3.19e-08 9.93e-08 erg/cm2
Peak flux Power-law 3.71e-01 3.18e-01 1.86e-01 1.62e-01 9.45e-01 1.04e+00 ph/cm2/s
Error 1.28e-01 7.55e-02 7.13e-02 1.21e-01 2.25e-01 2.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.88e-08 4.03e-08 5.81e-08 9.29e-08 1.55e-07 2.10e-07 erg/cm2
Error 6.53e-09 8.49e-09 1.44e-08 1.35e-07 3.48e-08 1.30e-07 erg/cm2
Peak flux Cutoff-PL 3.69e-01 3.20e-01 1.86e-01 1.52e-01 9.44e-01 1.03e+00 ph/cm2/s
Error 1.39e-01 8.71e-02 7.54e-02 1.59e-01 2.25e-01 2.74e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.56e-01 3.27e-01 1.91e-01 1.24e-01 9.39e-01 9.99e-01 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 1.439 0.294 - - 6.52e-03 1.15e-03 37.790 57
CPL 1.001 1.111 112.8 0.0 1.09e-02 2.85e-02 37.380 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.776 0.453 - - 6.92e-03 2.03e-03 44.170 57
CPL 1.746 1.797 403.7 -0.0 7.18e-03 2.83e-02 44.170 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 2.556 0.316 2.872
T90 2.300 0.456 2.756
T50 1.328 0.984 2.312
Peak 1.000 1.744 2.744
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
202.0571 +46.6856 0.0213 11.3 174.1 0.2509 9.1 TRIG_01152764
------------------------------------------
Foreground time interval of the image:
0.316 2.872 (delta_t = 2.556 [sec])
Background time interval of the image:
-239.888 0.316 (delta_t = 240.204 [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 0.316 sec. to 2.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43876 ( -0.289614 0.298135 )
Norm@50keV : 6.51527E-03 ( -0.00116319 0.00114577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.79 using 59 PHA bins.
# Reduced chi-squared = 0.6629 for 57 degrees of freedom
# Null hypothesis probability = 9.766857e-01
Photon flux (15-150 keV) in 2.556 sec: 0.800703 ( -0.135538 0.135594 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59692e-07 ( -3.16154e-08 3.22751e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.316 sec. to 2.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00088 ( -1.51206 0.710854 )
Epeak [keV] : 112.845 ( -112.844 -112.844 )
Norm@50keV : 1.09428E-02 ( -0.00548681 0.0515571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.38 using 59 PHA bins.
# Reduced chi-squared = 0.6676 for 56 degrees of freedom
# Null hypothesis probability = 9.737134e-01
Photon flux (15-150 keV) in 2.556 sec: 0.788184 ( -0.138306 0.139626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54566e-07 ( -3.46381e-08 3.49957e-08 ) ergs/cm2
Band function
Time interval is from 0.316 sec. to 2.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.893841 ( 0.913142 0.913142 )
beta : -1.88087 ( 1.85336 0.680239 )
Epeak [keV] : 97.2341 ( -99.7852 -99.7852 )
Norm@50keV : 1.25566E-02 ( -0.00670442 0.195621 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.36 using 59 PHA bins.
# Reduced chi-squared = 0.6794 for 55 degrees of freedom
# Null hypothesis probability = 9.670631e-01
Photon flux (15-150 keV) in 2.556 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] : 15.1552 (-2.77986 3.58038)
R^2/D10^2 : 9.07011E-02 (-0.0471228 0.0911241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.99 using 59 PHA bins.
# Reduced chi-squared = 0.7542 for 57 degrees of freedom
# Null hypothesis probability = 9.153408e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.113e-08 3.912e-09
25- 50 4.464e-08 1.295e-08
50-150 7.009e-08 2.458e-08
15-150 1.259e-07 3.286e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-91.7665 -199.363)
Norm : 3.28102 (-0.553061 0.553053)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.088e-08 1.202e-08
25- 50 4.017e-08 2.289e-08
50-150 8.810e-08 5.049e-08
15-150 1.492e-07 8.526e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.47818 (-1.8749 7.54418)
R1^2/D10^2 : 10.5965 (-10.3974 1605.92)
kT2 [keV] : 18.2612 (-4.08235 24.8307)
R2^2/D10^2 : 4.38203E-02 (-0.042193 0.0643016)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.944e-08 9.452e-09
25- 50 3.764e-08 1.898e-08
50-150 8.454e-08 4.722e-08
15-150 1.416e-07 6.224e-08
Peak spectrum fit
Power-law model
Time interval is from 1.744 sec. to 2.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77574 ( -0.418079 0.487266 )
Norm@50keV : 6.92121E-03 ( -0.00210856 0.00195745 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.17 using 59 PHA bins.
# Reduced chi-squared = 0.7749 for 57 degrees of freedom
# Null hypothesis probability = 8.929741e-01
Photon flux (15-150 keV) in 1 sec: 0.944907 ( -0.224607 0.224607 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.378e-08 ( -1.89258e-08 1.95381e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.744 sec. to 2.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74604 ( -1.70908 1.88431 )
Epeak [keV] : 403.730 ( -404.578 -404.588 )
Norm@50keV : 7.18309E-03 ( -0.00718383 0.0493437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.17 using 59 PHA bins.
# Reduced chi-squared = 0.7887 for 56 degrees of freedom
# Null hypothesis probability = 8.737361e-01
Photon flux (15-150 keV) in 1 sec: 0.943830 ( -0.224542 0.22537 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36322e-08 ( -1.94624e-08 1.96569e-08 ) ergs/cm2
Band function
Time interval is from 1.744 sec. to 2.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.21452 ( 3.21452 3.21452 )
beta : -1.77575 ( -0.487262 0.418197 )
Epeak [keV] : 87.4201 ( -87.4201 -87.4201 )
Norm@50keV : 0.940689 ( -0.286582 0.266049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.17 using 59 PHA bins.
# Reduced chi-squared = 0.8030 for 55 degrees of freedom
# Null hypothesis probability = 8.520025e-01
Photon flux (15-150 keV) in 1 sec: 0.939428 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2814 (-4.36176 5.25891)
R^2/D10^2 : 0.160381 (-0.109378 0.476533)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.997e-09 2.943e-09
25- 50 2.113e-08 1.042e-08
50-150 2.386e-08 1.595e-08
15-150 5.099e-08 2.476e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 120.177 (-70.7074 -118.957)
Norm : 4.03303 (-1.06134 1.62607)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-08 6.215e-09
25- 50 1.880e-08 1.108e-08
50-150 3.357e-08 2.319e-08
15-150 6.287e-08 3.963e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.76911 (-1.82821 3.119)
R1^2/D10^2 : 13.9873 (-12.9334 666.79)
kT2 [keV] : 19.3403 (-6.21612 13.3716)
R2^2/D10^2 : 3.57968E-02 (-0.0304294 0.0533515)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.208e-08 7.270e-09
25- 50 1.561e-08 8.420e-09
50-150 3.514e-08 2.252e-08
15-150 6.283e-08 3.530e-08
Plot creation:
Sun Feb 5 21:44:02 EST 2023