batgrbproduct analysis for trigger=1165948
batgrbproduct Analysis for Trigger=1165948
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): Fri Apr 28 11:59:12 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1165948/GCN5_download_cron
======================================================================
Trigger: 01165948 Segment: 000
BAT Trigger Time: 704284343.168 [s; MET]
Trigger Stop: 704284345.216 [s; MET]
UTC: 2023-04-27T10:31:51.987820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 153.324167550389 Dec: 48.1798072225164 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.8
Image Trigger?: NO
Rate S/N Ratio: 11.0453610171873 [ if not an image trigger ]
Image S/N Ratio: 6.8
Flight Position: [ source = BAT ]
RA: 153.324167550389 Dec: 48.1798072225164 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 153.339474699359 Dec: 48.2311983981957 [deg; J2000]
{ 10h 13m 21.5s , +48d 13' 52.3" }
+/- 3.26407846581365 [arcmin] (estimated 90% radius based on SNR)
+/- 2.01642364061006 [arcmin] (formal 1-sigma fit error)
SNR: 5.61273683084697
Angular difference between Flight and Ground position is 3.143637 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 4 +/- 1.4142135623731
Measured from: -0.167999863624573
to: 3.83200013637543 [s; relative to TRIGTIME]
T50: 3 +/- 2
Measured from: -0.167999863624573
to: 2.83200013637543 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.167999982833862
to: 0.832000017166138 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.167999982833862
to: 3.83200001716614 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.116856 0.080942 0.023940 -0.007279
0.018533 0.018580 0.016088 0.013570 [error]
Peak 0.044100 0.035981 0.018668 0.002524
0.009448 0.009801 0.008402 0.006987 [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 2.84e-08 3.10e-08 2.42e-08 3.09e-08 9.52e-08 1.15e-07 erg/cm2
Error 7.56e-09 8.39e-09 1.21e-08 3.47e-08 2.94e-08 4.77e-08 erg/cm2
Peak flux Power-law 3.18e-01 2.30e-01 1.10e-01 7.40e-02 6.93e-01 7.31e-01 ph/cm2/s
Error 1.21e-01 7.28e-02 5.64e-02 8.24e-02 2.14e-01 2.31e-01 ph/cm2/s
Fluence Cutoff-PL 3.15e-08 3.30e-08 6.07e-10 2.85e-15 6.51e-08 6.51e-08 erg/cm2
Error 9.15e-09 1.35e-08 4.58e-09 8.37e-11 1.75e-08 1.76e-08 erg/cm2
Peak flux Cutoff-PL 3.20e-01 3.19e-01 5.44e-03 2.19e-08 6.44e-01 6.44e-01 ph/cm2/s
Error 1.42e-01 1.27e-01 4.62e-02 2.63e-03 1.97e-01 1.97e-01 ph/cm2/s
Fluence Band 3.13e-08 3.53e-08 1.06e-08 3.84e-09 7.97e-08 8.15e-08 erg/cm2
Error 8.67e-09 1.10e-08 -------- -------- -------- -------- 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 2.361 0.466 - - 2.46e-03 9.27e-04 80.830 57
CPL -6.725 -0.199 25.2 3.4 1.26e+04 2.40e+06 74.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.064 0.529 - - 4.48e-03 1.82e-03 61.580 57
CPL -7.488 0.121 27.8 4.0 2.99e+04 1.43e+06 55.630 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 4.000 -0.168 3.832
T90 4.000 -0.168 3.832
T50 3.000 -0.168 2.832
Peak 1.000 -0.168 0.832
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
153.3395 +48.2312 0.0342 13.6 -77.0 0.1962 5.6 TRIG_01165948
------------------------------------------
Foreground time interval of the image:
-0.168 3.832 (delta_t = 4.000 [sec])
Background time interval of the image:
-239.168 -152.008 (delta_t = 87.160 [sec])
-151.168 -0.168 (delta_t = 151.000 [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 -0.168 sec. to 3.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36125 ( -0.428332 0.504489 )
Norm@50keV : 2.46053E-03 ( -0.000917798 0.000936829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.83 using 59 PHA bins.
# Reduced chi-squared = 1.418 for 57 degrees of freedom
# Null hypothesis probability = 2.063826e-02
Photon flux (15-150 keV) in 4 sec: 0.445132 ( -0.104531 0.104842 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.51756e-08 ( -2.80708e-08 3.08045e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.168 sec. to 3.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.72527 ( 6.72512 6.32704 )
Epeak [keV] : 25.2307 ( -2.99636 3.81397 )
Norm@50keV : 1.26384E+04 ( -12635.8 4.79322e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.02 using 59 PHA bins.
# Reduced chi-squared = 1.322 for 56 degrees of freedom
# Null hypothesis probability = 5.369548e-02
Photon flux (15-150 keV) in 4 sec: 0.412971 ( -0.095842 0.097339 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.51172e-08 ( -1.62632e-08 1.88272e-08 ) ergs/cm2
Band function
Time interval is from -0.168 sec. to 3.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97547 ( -14.6949 -4.97547 )
beta : -3.79677 ( 3.79677 1.21496 )
Epeak [keV] : 24.5149 ( -3.75513 3.92521 )
Norm@50keV : 741.584 ( -160.191 1596.83 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.29 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 55 degrees of freedom
# Null hypothesis probability = 5.015101e-02
Photon flux (15-150 keV) in 4 sec: 0.420139 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.96932e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.40755 (-1.15439 1.44981)
R^2/D10^2 : 1.30414 (-0.75188 1.70532)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.63 using 59 PHA bins.
# Reduced chi-squared = 1.327 for 57 degrees of freedom
# Null hypothesis probability = 4.992066e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.109e-08 1.758e-08
25- 50 3.565e-08 1.590e-08
50-150 4.243e-09 3.180e-09
15-150 7.099e-08 3.821e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.1734 (-12.3277 27.9193)
Norm : 3.61796 (-1.38485 2.44508)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.954e-08 1.134e-08
25- 50 3.386e-08 1.455e-08
50-150 1.869e-08 1.393e-08
15-150 8.209e-08 3.616e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.03048 (-1.27493 1.51579)
R1^2/D10^2 : 1.57334 (-0.902196 2.45204)
kT2 [keV] : 28.7335 (-29.7963 -29.7963)
R2^2/D10^2 : 1.14534E-03 (-0.00102229 2.4689)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.124e-08 1.798e-08
25- 50 3.456e-08 2.168e-08
50-150 2.468e-08 1.775e-08
15-150 9.048e-08 4.944e-08
Peak spectrum fit
Power-law model
Time interval is from -0.168 sec. to 0.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06361 ( -0.491395 0.56644 )
Norm@50keV : 4.48324E-03 ( -0.00182501 0.00181112 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.58 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.157254e-01
Photon flux (15-150 keV) in 1 sec: 0.692865 ( -0.21404 0.214424 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14847e-08 ( -1.51594e-08 1.64302e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.168 sec. to 0.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.48778 ( 7.49928 7.74215 )
Epeak [keV] : 27.8471 ( -3.97506 4.03672 )
Norm@50keV : 2.98628E+04 ( -31554.1 2.82328e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.63 using 59 PHA bins.
# Reduced chi-squared = 0.9934 for 56 degrees of freedom
# Null hypothesis probability = 4.887531e-01
Photon flux (15-150 keV) in 1 sec: 0.644231 ( -0.189413 0.203869 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72171e-08 ( -8.4825e-09 1.22287e-08 ) ergs/cm2
Band function
Time interval is from -0.168 sec. to 0.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.62546 -5 )
beta : -3.59566 ( 3.59588 1.35767 )
Epeak [keV] : 27.7960 ( -5.91539 5.74224 )
Norm@50keV : 521.842 ( -144.467 1866.17 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.78 using 59 PHA bins.
# Reduced chi-squared = 0.9960 for 55 degrees of freedom
# Null hypothesis probability = 4.829659e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49612e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.74150 (-1.75884 2.41355)
R^2/D10^2 : 0.977590 (-0.97759 1.72932)
(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 1.033e-08 6.225e-09
25- 50 1.706e-08 1.034e-08
50-150 4.016e-09 3.386e-09
15-150 3.140e-08 1.920e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.7469 (-22.8635 79.9801)
Norm : 4.27185 (-1.7427 3.00295)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.022e-08 5.742e-09
25- 50 1.420e-08 8.613e-09
50-150 1.264e-08 9.715e-09
15-150 3.706e-08 2.161e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.995 (-199.995 -199.995)
R1^2/D10^2 : 2.06232E-05 (-2.06232e-05 -2.06232e-05)
kT2 [keV] : 7.57755 (-1.69677 2.44938)
R2^2/D10^2 : 1.04649 (-0.703571 1.5433)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.033e-08 1.910e-01
25- 50 1.706e-08 1.540e+00
50-150 4.017e-09 3.880e+01
15-150 3.141e-08 4.482e+01
Plot creation:
Fri Apr 28 12:04:44 EDT 2023