batgrbproduct analysis for trigger=1205708
batgrbproduct Analysis for Trigger=1205708
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): Tue Jan 2 16:11:02 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1205708/GCN5_download_cron
======================================================================
Trigger: 01205708 Segment: 000
BAT Trigger Time: 725811649.984 [s; MET]
Trigger Stop: 725811654.08 [s; MET]
UTC: 2024-01-01T14:20:17.331180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 10.3487970738741 Dec: 8.52564743491041 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.07
Image Trigger?: NO
Rate S/N Ratio: 11.1803398874989 [ if not an image trigger ]
Image S/N Ratio: 8.07
Flight Position: [ source = BAT ]
RA: 10.3487970738741 Dec: 8.52564743491041 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 10.2888869676066 Dec: 8.53996496332769 [deg; J2000]
{ 00h 41m 09.3s , +08d 32' 23.9" }
+/- 3.77408568898492 [arcmin] (estimated 90% radius based on SNR)
+/- 2.92169011830874 [arcmin] (formal 1-sigma fit error)
SNR: 4.56143599281319
Angular difference between Flight and Ground position is 3.657144 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 15.8400000333786 +/- 6.12097780656834
Measured from: -1.41599988937378
to: 14.4240001440048 [s; relative to TRIGTIME]
T50: 7.8400000333786 +/- 3.85041905595529
Measured from: 0.776000142097473
to: 8.61600017547607 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.10800004005432
to: 3.10800004005432 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.94400000572205
to: 20.2800000905991 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.255717 0.229252 0.093575 0.050742
0.037891 0.038867 0.033365 0.029665 [error]
Peak 0.038449 0.044080 0.014054 -0.002841
0.008649 0.008764 0.007602 0.006497 [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 7.51e-08 1.00e-07 9.83e-08 1.73e-07 3.30e-07 4.46e-07 erg/cm2
Error 1.82e-08 1.85e-08 3.18e-08 1.10e-07 7.39e-08 1.47e-07 erg/cm2
Peak flux Power-law 4.26e-01 3.03e-01 1.43e-01 9.42e-02 9.17e-01 9.66e-01 ph/cm2/s
Error 1.33e-01 7.39e-02 5.89e-02 7.24e-02 2.19e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 7.37e-08 1.07e-07 9.28e-08 6.40e-08 3.10e-07 3.37e-07 erg/cm2
Error 1.92e-08 2.66e-08 4.25e-08 9.86e-08 8.91e-08 1.84e-07 erg/cm2
Peak flux Cutoff-PL 3.77e-01 3.64e-01 1.35e-01 1.59e-02 8.89e-01 8.91e-01 ph/cm2/s
Error 1.52e-01 1.06e-01 7.36e-02 5.13e-02 2.18e-01 2.22e-01 ph/cm2/s
Fluence Band 8.50e-08 1.20e-07 9.87e-08 1.35e-07 3.55e-07 4.40e-07 erg/cm2
Error 2.17e-08 2.47e-08 -------- -------- 7.92e-08 -------- erg/cm2
Peak flux Band 3.76e-01 3.64e-01 1.35e-01 1.58e-02 8.89e-01 8.91e-01 ph/cm2/s
Error -------- -------- 7.24e-02 -------- 2.18e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.028 0.342 - - 1.61e-03 3.83e-04 63.720 57
CPL 1.540 1.420 35.9 0.0 3.22e-03 0.00e+00 63.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.089 0.441 - - 5.86e-03 1.88e-03 40.990 57
CPL 0.514 2.271 37.8 0.0 5.04e-02 1.67e+00 38.900 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 22.224 -1.944 20.280
T90 15.840 -1.416 14.424
T50 7.840 0.776 8.616
Peak 1.000 2.108 3.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
10.2889 +8.5400 0.0421 33.5 -145.2 0.4970 4.6 TRIG_01205708
------------------------------------------
Foreground time interval of the image:
-1.944 20.280 (delta_t = 22.224 [sec])
Background time interval of the image:
-60.984 -55.261 (delta_t = 5.723 [sec])
-10.984 -1.944 (delta_t = 9.040 [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 -1.944 sec. to 20.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02812 ( -0.325624 0.357384 )
Norm@50keV : 1.60862E-03 ( -0.000390202 0.000376421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.72 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.520423e-01
Photon flux (15-150 keV) in 22.22 sec: 0.244467 ( -0.0440931 0.0440934 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30171e-07 ( -7.24396e-08 7.53893e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.944 sec. to 20.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54019 ( -2.25928 0.581492 )
Epeak [keV] : 35.9067 ( )
Norm@50keV : 3.22027E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.44 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 56 degrees of freedom
# Null hypothesis probability = 2.306630e-01
Photon flux (15-150 keV) in 22.22 sec: 0.240809 ( -0.045653 0.045555 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.09565e-07 ( -8.64314e-08 9.16953e-08 ) ergs/cm2
Band function
Time interval is from -1.944 sec. to 20.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93212 ( -4.93212 -4.93212 )
beta : -2.25992 ( -0.650378 0.4174 )
Epeak [keV] : 22.4532 ( -22.4532 5.31323 )
Norm@50keV : 510.420 ( -90.8039 2.16086e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.41 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Null hypothesis probability = 2.572082e-01
Photon flux (15-150 keV) in 22.22 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54822e-07 ( -3.54667e-07 -7.71656e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.83361 (-1.72231 2.10011)
R^2/D10^2 : 0.185353 (-0.104932 0.246893)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.06 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.498557e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.195e-08 2.094e-08
25- 50 1.279e-07 4.131e-08
50-150 4.605e-08 2.537e-08
15-150 2.359e-07 7.496e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 57.5336 (-23.6844 57.298)
Norm : 1.31322 (-0.359088 0.51413)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.282e-08 1.779e-08
25- 50 1.094e-07 2.875e-08
50-150 1.201e-07 6.395e-08
15-150 3.023e-07 8.801e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.60343 (-4.64314 2.30332)
R1^2/D10^2 : 0.307798 (-0.0998351 5.41804)
kT2 [keV] : 88.5489 (-84.2863 -94.3691)
R2^2/D10^2 : 7.39385E-05 (-5.69577e-05 0.0938708)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.364e-08 4.311e-08
25- 50 1.048e-07 5.724e-08
50-150 1.211e-07 7.915e-08
15-150 2.995e-07 1.658e-07
Peak spectrum fit
Power-law model
Time interval is from 2.108 sec. to 3.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08888 ( -0.407694 0.474269 )
Norm@50keV : 5.85793E-03 ( -0.00190932 0.00184106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7192 for 57 degrees of freedom
# Null hypothesis probability = 9.456594e-01
Photon flux (15-150 keV) in 1 sec: 0.916580 ( -0.218981 0.218987 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4373e-08 ( -1.55844e-08 1.64316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.108 sec. to 3.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.514297 ( -2.97183 1.57023 )
Epeak [keV] : 37.8096 ( -37.8124 -37.8124 )
Norm@50keV : 5.04115E-02 ( -0.0504516 3.28922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.90 using 59 PHA bins.
# Reduced chi-squared = 0.6947 for 56 degrees of freedom
# Null hypothesis probability = 9.601733e-01
Photon flux (15-150 keV) in 1 sec: 0.889093 ( -0.216284 0.219317 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.88993e-08 ( -1.40962e-08 1.68708e-08 ) ergs/cm2
Band function
Time interval is from 2.108 sec. to 3.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.532663 ( -1.28476 5.41256 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 37.6974 ( -22.7249 327.298 )
Norm@50keV : 4.93523E-02 ( -0.0493087 3.29262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.90 using 59 PHA bins.
# Reduced chi-squared = 0.7073 for 55 degrees of freedom
# Null hypothesis probability = 9.506931e-01
Photon flux (15-150 keV) in 1 sec: 0.888813 ( 6.11119 -0.217191 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8916e-08 ( -4.8909e-08 -1.39873e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.65574 (-2.18297 2.79542)
R^2/D10^2 : 0.514461 (-0.324058 0.863071)
(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 9.643e-09 4.974e-09
25- 50 2.280e-08 1.079e-08
50-150 1.074e-08 6.707e-09
15-150 4.318e-08 1.750e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 54.2040 (-23.9735 64.6526)
Norm : 5.09504 (-1.1965 2.52071)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.267e-08 7.399e-09
25- 50 1.871e-08 1.278e-08
50-150 1.957e-08 2.246e-08
15-150 5.096e-08 4.175e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.08872 (-4.08871 -4.08871)
R1^2/D10^2 : 6.59616 (-6.59616 -6.59616)
kT2 [keV] : 12.3114 (-3.97398 -12.3115)
R2^2/D10^2 : 0.165378 (-0.165317 0.740022)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.198e-08 5.680e-09
25- 50 1.978e-08 1.132e-08
50-150 1.599e-08 1.025e-08
15-150 4.775e-08 2.496e-08
Plot creation:
Tue Jan 2 16:12:56 EST 2024