batgrbproduct analysis for trigger=1247745
batgrbproduct Analysis for Trigger=1247745
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 Aug 10 19:33:32 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1247745/GCN5_download_cron
======================================================================
Trigger: 01247745 Segment: 000
BAT Trigger Time: 744885063.552 [s; MET]
Trigger Stop: 744885064.064 [s; MET]
UTC: 2024-08-09T08:30:29.592500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 237.551195371051 Dec: -2.32115782967295 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.85
Image Trigger?: NO
Rate S/N Ratio: 90.0777441991084 [ if not an image trigger ]
Image S/N Ratio: 12.85
Flight Position: [ source = BAT ]
RA: 237.551195371051 Dec: -2.32115782967295 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.545089580423 Dec: -2.33087266074911 [deg; J2000]
{ 15h 50m 10.8s , -02d 19' 51.1" }
+/- 0.540219031114718 [arcmin] (estimated 90% radius based on SNR)
+/- 0.162937794804625 [arcmin] (formal 1-sigma fit error)
SNR: 73.3096943874048
Angular difference between Flight and Ground position is 0.688295 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 72.8559999465942 +/- 19.3861745023931
Measured from: -2.91999995708466
to: 69.9359999895096 [s; relative to TRIGTIME]
T50: 9.53599989414215 +/- 0.712179721523657
Measured from: 2.12000012397766
to: 11.6560000181198 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.67999994754791
to: 3.67999994754791 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.87600004673
to: 180.519999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.347675 4.678801 4.514526 1.824235
0.095991 0.095336 0.084667 0.071870 [error]
Peak 0.262746 0.511789 0.614943 0.326437
0.012466 0.016271 0.017915 0.016306 [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 8.84e-07 1.99e-06 3.56e-06 1.49e-05 9.69e-06 2.14e-05 erg/cm2
Error 4.93e-08 6.31e-08 8.87e-08 9.50e-07 2.28e-07 9.66e-07 erg/cm2
Peak flux Power-law 2.34e+00 3.59e+00 4.14e+00 9.13e+00 1.28e+01 1.92e+01 ph/cm2/s
Error 1.77e-01 1.60e-01 1.45e-01 7.44e-01 4.25e-01 7.80e-01 ph/cm2/s
Fluence Cutoff-PL 8.80e-07 2.00e-06 3.56e-06 1.39e-05 9.69e-06 2.03e-05 erg/cm2
Error 4.94e-08 6.36e-08 8.89e-08 -------- 2.29e-07 9.87e-07 erg/cm2
Peak flux Cutoff-PL 2.35e+00 3.60e+00 4.14e+00 9.04e+00 1.28e+01 1.91e+01 ph/cm2/s
Error -------- 1.60e-01 -------- -------- 4.25e-01 -------- 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 1.166 0.047 - - 5.00e-03 1.19e-04 59.490 57
CPL 1.161 0.048 10000.0 0.0 5.03e-03 1.17e-04 59.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.797 0.062 - - 1.11e-01 3.76e-03 63.200 57
CPL 0.792 0.063 9999.4 0.0 1.12e-01 8.89e-03 63.330 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: 62.016000 sec.
T50 in the 50-300 keV band: 5.312000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 191.396 -10.876 180.520
T90 72.856 -2.920 69.936
T50 9.536 2.120 11.656
Peak 1.000 2.680 3.680
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.5451 -2.3309 0.0026 28.3 162.2 10.3646 73.3 TRIG_01247745
------------------------------------------
Foreground time interval of the image:
-10.876 8.949 (delta_t = 19.825 [sec])
Background time interval of the image:
-239.552 -231.592 (delta_t = 7.960 [sec])
-230.552 -140.292 (delta_t = 90.260 [sec])
-138.552 -62.772 (delta_t = 75.780 [sec])
-61.552 -51.089 (delta_t = 10.462 [sec])
-49.552 -10.876 (delta_t = 38.676 [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
Multiple GTIs in the spectrum
tstart tstop
-10.876000 48.168000
50.448000 180.520000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16614 ( -0.0470436 0.0467886 )
Norm@50keV : 5.00319E-03 ( -0.000119559 0.000118933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.49 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.851113e-01
Photon flux (15-150 keV) in 189.1 sec: 0.584626 ( -0.015321 0.0153826 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.69283e-06 ( -2.2823e-07 2.28578e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-10.876000 48.168000
50.448000 180.520000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16119 ( -0.0524908 0.0426597 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.02757E-03 ( -0.000119551 0.000113933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.88 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 56 degrees of freedom
# Null hypothesis probability = 3.367410e-01
Photon flux (15-150 keV) in 189.1 sec: 0.584924 ( -0.016032 0.014774 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.69457e-06 ( -2.28282e-07 2.28754e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-10.876000 48.168000
50.448000 180.520000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.916299 ( 0.916377 0.916377 )
beta : -1.16614 ( -0.0467916 0.047035 )
Epeak [keV] : 52.2850 ( -52.2514 -52.2514 )
Norm@50keV : 9.16453E-03 ( -0.00312991 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.49 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.155783e-01
Photon flux (15-150 keV) in 189.1 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] : 23.1256 ( )
R^2/D10^2 : 1.62218E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 514.17 using 59 PHA bins.
# Reduced chi-squared = 9.0205 for 57 degrees of freedom
# Null hypothesis probability = 8.263995e-75
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.965e-07 1.503e-08
25- 50 1.614e-06 6.108e-08
50-150 6.445e-06 2.061e-07
15-150 8.355e-06 2.222e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.55045 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.201e-06 3.290e-08
25- 50 2.310e-06 5.862e-08
50-150 5.067e-06 1.371e-07
15-150 8.578e-06 2.307e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.50390 (-0.64454 0.702764)
R1^2/D10^2 : 0.434150 (-0.119426 0.173837)
kT2 [keV] : 37.8461 (-3.03085 3.83291)
R2^2/D10^2 : 3.12701E-03 (-0.000769872 0.00090093)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.074e-07 7.460e-08
25- 50 2.002e-06 1.008e-07
50-150 7.056e-06 3.602e-07
15-150 9.965e-06 3.924e-07
Peak spectrum fit
Power-law model
Time interval is from 2.680 sec. to 3.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.796621 ( -0.0627497 0.0621731 )
Norm@50keV : 0.111164 ( -0.00377304 0.00375557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.20 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.667573e-01
Photon flux (15-150 keV) in 1 sec: 12.7779 ( -0.4249 0.425325 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3009e-06 ( -4.76316e-08 4.7841e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.680 sec. to 3.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.792475 ( -0.0662722 0.0599003 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 0.111911 ( -0.00382496 0.013949 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.33 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 56 degrees of freedom
# Null hypothesis probability = 2.337194e-01
Photon flux (15-150 keV) in 1 sec: 12.7770 ( -0.4283 0.4222 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3009e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 2.680 sec. to 3.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.874586 ( 0.874586 0.874586 )
beta : -0.796622 ( -0.0621318 0.0628234 )
Epeak [keV] : 14.6828 ( -14.6828 -14.6828 )
Norm@50keV : 0.161986 ( -0.0540921 2.29617e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.20 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.093298e-01
Photon flux (15-150 keV) in 1 sec: ( ) 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] : 25.9039 ( )
R^2/D10^2 : 0.288211 ( )
(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 3.296e-08 2.230e-09
25- 50 1.903e-07 9.800e-09
50-150 9.414e-07 4.675e-08
15-150 1.165e-06 4.500e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 49.4850 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.232e-07 4.500e-09
25- 50 2.370e-07 9.250e-09
50-150 5.199e-07 2.080e-08
15-150 8.801e-07 3.155e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.99740 (-1.53278 1.68442)
R1^2/D10^2 : 2.79401 (-0.952091 1.71316)
kT2 [keV] : 51.3094 (-9.1327 17.1386)
R2^2/D10^2 : 3.77090E-02 (-0.0188676 0.0261044)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.749e-08 7.365e-09
25- 50 2.186e-07 2.420e-08
50-150 1.041e-06 1.588e-07
15-150 1.327e-06 2.016e-07
Plot creation:
Sat Aug 10 19:36:49 EDT 2024