batgrbproduct analysis for trigger=1253910
batgrbproduct Analysis for Trigger=1253910
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 Sep 13 03:21:57 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1253910/GCN5_download_cron
======================================================================
Trigger: 01253910 Segment: 000
BAT Trigger Time: 747798433.344 [s; MET]
Trigger Stop: 747798433.856 [s; MET]
UTC: 2024-09-12T01:46:39.185300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 124.63322615577 Dec: 33.9949552639727 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.78
Image Trigger?: NO
Rate S/N Ratio: 13 [ if not an image trigger ]
Image S/N Ratio: 7.78
Flight Position: [ source = BAT ]
RA: 124.63322615577 Dec: 33.9949552639727 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 124.62453702713 Dec: 33.9989424636142 [deg; J2000]
{ 08h 18m 29.9s , +33d 59' 56.2" }
+/- 1.02507086796952 [arcmin] (estimated 90% radius based on SNR)
+/- 0.338371188554173 [arcmin] (formal 1-sigma fit error)
SNR: 29.3599747808909
Angular difference between Flight and Ground position is 0.494021 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 113.243999958038 +/- 7.82908843356277
Measured from: 20.7200001478195
to: 133.964000105858 [s; relative to TRIGTIME]
T50: 25.1599999666214 +/- 0.467657901898404
Measured from: 62.1160001754761
to: 87.2760001420975 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 76.0520000457764
to: 77.0520000457764 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.35199999809265
to: 373.019999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 16.946883 21.502118 15.291739 3.327494
0.127544 0.134364 0.114922 0.086282 [error]
Peak 0.508685 0.714735 0.524026 0.131801
0.012558 0.014630 0.013110 0.008127 [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 5.65e-06 9.30e-06 1.16e-05 2.87e-05 3.46e-05 5.53e-05 erg/cm2
Error 1.73e-07 1.68e-07 1.64e-07 9.54e-07 4.59e-07 9.85e-07 erg/cm2
Peak flux Power-law 5.44e+00 5.27e+00 3.57e+00 3.78e+00 1.58e+01 1.81e+01 ph/cm2/s
Error 2.79e-01 1.61e-01 1.12e-01 2.54e-01 4.57e-01 4.75e-01 ph/cm2/s
Fluence Cutoff-PL 5.21e-06 9.32e-06 1.19e-05 2.24e-05 3.42e-05 4.89e-05 erg/cm2
Error 2.46e-07 1.71e-07 2.10e-07 2.34e-06 4.97e-07 2.41e-06 erg/cm2
Peak flux Cutoff-PL 5.02e+00 5.36e+00 3.69e+00 2.77e+00 1.55e+01 1.68e+01 ph/cm2/s
Error 3.63e-01 1.74e-01 1.34e-01 5.20e-01 4.96e-01 7.62e-01 ph/cm2/s
Fluence Band -------- 9.28e-06 1.19e-05 2.31e-05 3.41e-05 4.96e-05 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 1.681 0.025 - - 9.95e-03 1.37e-04 43.740 57
CPL 1.432 0.108 140.5 41.0 1.25e-02 1.24e-03 27.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.563 0.048 - - 1.24e-01 3.27e-03 55.580 57
CPL 1.239 0.201 128.5 68.7 1.76e-01 3.72e-02 47.480 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: 96.704000 sec.
T50 in the 50-300 keV band: 18.688000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 375.372 -2.352 373.020
T90 113.244 20.720 133.964
T50 25.160 62.116 87.276
Peak 1.000 76.052 77.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
124.6245 +33.9989 0.0065 29.1 -165.3 1.4193 29.4 TRIG_01253910
------------------------------------------
Foreground time interval of the image:
-2.352 10.057 (delta_t = 12.409 [sec])
Background time interval of the image:
-156.843 -89.184 (delta_t = 67.659 [sec])
-88.344 -87.334 (delta_t = 1.010 [sec])
-86.344 -85.544 (delta_t = 0.800 [sec])
-83.344 -82.304 (delta_t = 1.040 [sec])
-81.344 -2.352 (delta_t = 78.992 [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 -2.352 sec. to 373.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68147 ( -0.0252982 0.025242 )
Norm@50keV : 9.94556E-03 ( -0.000136571 0.000136428 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.74 using 59 PHA bins.
# Reduced chi-squared = 0.7673 for 57 degrees of freedom
# Null hypothesis probability = 9.015415e-01
Photon flux (15-150 keV) in 375.4 sec: 1.31244 ( -0.0237902 0.0239133 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46214e-05 ( -4.59426e-07 4.5949e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.352 sec. to 373.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43234 ( -0.109646 0.107332 )
Epeak [keV] : 140.469 ( -24.4716 57.6102 )
Norm@50keV : 1.25460E-02 ( -0.00116979 0.00131545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.79 using 59 PHA bins.
# Reduced chi-squared = 0.4962 for 56 degrees of freedom
# Null hypothesis probability = 9.994329e-01
Photon flux (15-150 keV) in 375.4 sec: 1.27478 ( -0.02786 0.02815 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41778e-05 ( -4.96804e-07 4.97067e-07 ) ergs/cm2
Band function
Time interval is from -2.352 sec. to 373.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43426 ( -0.0789535 0.0733497 )
beta : -2.19674 ( 8.86362 7.12344 )
Epeak [keV] : 141.326 ( -13.538 31.4527 )
Norm@50keV : 1.25166E-02 ( -0.000164776 0.00124301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.79 using 59 PHA bins.
# Reduced chi-squared = 0.5053 for 55 degrees of freedom
# Null hypothesis probability = 9.991777e-01
Photon flux (15-150 keV) in 375.4 sec: 2.92281 ( 4.07719 -0.0772 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41438e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.2125 ( )
R^2/D10^2 : 6.64585E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1169.00 using 59 PHA bins.
# Reduced chi-squared = 20.5087 for 57 degrees of freedom
# Null hypothesis probability = 3.194048e-207
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.651e-06 4.805e-08
25- 50 7.700e-06 1.614e-07
50-150 1.860e-05 3.304e-07
15-150 2.795e-05 4.148e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 179.889 (-11.65 12.8238)
Norm : 5.16232 (-0.095639 0.100666)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.887e-06 1.952e-07
25- 50 9.285e-06 3.491e-07
50-150 1.966e-05 3.382e-06
15-150 3.383e-05 3.531e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.08971 (-0.433194 0.452737)
R1^2/D10^2 : 0.816441 (-0.141898 0.180303)
kT2 [keV] : 28.4462 (-1.31769 1.52388)
R2^2/D10^2 : 1.03642E-02 (-0.00188556 0.00211119)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.165e-06 2.365e-07
25- 50 9.592e-06 2.140e-07
50-150 1.964e-05 4.674e-07
15-150 3.340e-05 6.626e-07
Peak spectrum fit
Power-law model
Time interval is from 76.052 sec. to 77.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56273 ( -0.0478621 0.0479954 )
Norm@50keV : 0.124364 ( -0.00327188 0.00327144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.58 using 59 PHA bins.
# Reduced chi-squared = 0.9751 for 57 degrees of freedom
# Null hypothesis probability = 5.285162e-01
Photon flux (15-150 keV) in 1 sec: 15.8024 ( -0.456527 0.457686 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16869e-06 ( -3.22166e-08 3.22509e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 76.052 sec. to 77.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23874 ( -0.205657 0.196581 )
Epeak [keV] : 128.544 ( -29.756 107.6 )
Norm@50keV : 0.175662 ( -0.0324829 0.0419865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.48 using 59 PHA bins.
# Reduced chi-squared = 0.8479 for 56 degrees of freedom
# Null hypothesis probability = 7.840575e-01
Photon flux (15-150 keV) in 1 sec: 15.4605 ( -0.4946 0.4966 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14792e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 76.052 sec. to 77.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.961677 ( -0.340664 0.800686 )
beta : -1.76159 ( -0.216003 0.13617 )
Epeak [keV] : 82.2040 ( -34.5728 55.9323 )
Norm@50keV : 0.250168 ( -0.0835945 0.581767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.08 using 59 PHA bins.
# Reduced chi-squared = 0.8014 for 55 degrees of freedom
# Null hypothesis probability = 8.542802e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14161e-06 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.8804 ( )
R^2/D10^2 : 1.42212 ( )
(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 7.428e-08 4.080e-09
25- 50 3.105e-07 1.065e-08
50-150 5.458e-07 2.625e-08
15-150 9.306e-07 2.800e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-17.5964 -200)
Norm : 64.1181 (-1.6808 1.6808)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.597e-07 4.650e-09
25- 50 3.072e-07 8.700e-09
50-150 6.738e-07 1.995e-08
15-150 1.141e-06 3.250e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.61315 (-0.964869 0.988626)
R1^2/D10^2 : 8.12090 (-2.23898 3.63546)
kT2 [keV] : 30.5237 (-3.9611 5.90166)
R2^2/D10^2 : 0.104304 (-0.0481443 0.0713008)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.295e-07 1.235e-08
25- 50 3.203e-07 1.740e-08
50-150 6.862e-07 6.380e-08
15-150 1.136e-06 8.780e-08
Plot creation:
Fri Sep 13 03:26:10 EDT 2024