batgrbproduct analysis for trigger=1257556
batgrbproduct Analysis for Trigger=1257556
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): Wed Oct 2 23:38:33 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1257556/GCN5_download_cron
======================================================================
Trigger: 01257556 Segment: 000
BAT Trigger Time: 749523057.152 [s; MET]
Trigger Stop: 749523058.176 [s; MET]
UTC: 2024-10-02T00:50:22.875360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 140.954765070369 Dec: 39.8542969957009 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.55
Image Trigger?: NO
Rate S/N Ratio: 12.0830459735946 [ if not an image trigger ]
Image S/N Ratio: 7.55
Flight Position: [ source = BAT ]
RA: 140.954765070369 Dec: 39.8542969957009 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 140.942152048495 Dec: 39.8290225492152 [deg; J2000]
{ 09h 23m 46.1s , +39d 49' 44.5" }
+/- 0.978564753807234 [arcmin] (estimated 90% radius based on SNR)
+/- 0.350125270359015 [arcmin] (formal 1-sigma fit error)
SNR: 31.3734192125524
Angular difference between Flight and Ground position is 1.623981 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 46.8120000362396 +/- 10.5166583385695
Measured from: -16.7679998874664
to: 30.0440001487732 [s; relative to TRIGTIME]
T50: 13.6759999990463 +/- 2.74719417756916
Measured from: -6.61199986934662
to: 7.06400012969971 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.287999987602234
to: 0.712000012397766 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.3359999656677
to: 44.8600000143051 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.348629 1.460638 0.776030 0.143813
0.060337 0.062685 0.052410 0.043064 [error]
Peak 0.051180 0.067550 0.073556 0.005307
0.008417 0.009025 0.007753 0.005545 [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 4.69e-07 6.30e-07 6.23e-07 1.11e-06 2.08e-06 2.83e-06 erg/cm2
Error 3.87e-08 3.29e-08 5.28e-08 1.92e-07 1.21e-07 2.42e-07 erg/cm2
Peak flux Power-law 5.49e-01 5.55e-01 3.94e-01 4.45e-01 1.67e+00 1.94e+00 ph/cm2/s
Error 1.15e-01 7.54e-02 5.97e-02 1.31e-01 2.17e-01 2.46e-01 ph/cm2/s
Fluence Cutoff-PL 4.45e-07 6.56e-07 6.23e-07 5.92e-07 2.01e-06 2.32e-06 erg/cm2
Error 4.55e-08 4.21e-08 5.62e-08 3.90e-07 1.40e-07 4.15e-07 erg/cm2
Peak flux Cutoff-PL 4.16e-01 6.13e-01 4.55e-01 1.69e-01 1.61e+00 1.65e+00 ph/cm2/s
Error 1.43e-01 9.16e-02 7.72e-02 1.18e-01 2.24e-01 2.53e-01 ph/cm2/s
Fluence Band 4.39e-07 6.55e-07 6.16e-07 7.63e-07 2.01e-06 2.48e-06 erg/cm2
Error 4.61e-08 -------- 6.03e-08 -------- -------- -------- erg/cm2
Peak flux Band 4.67e-01 6.00e-01 4.37e-01 2.25e-01 1.64e+00 1.73e+00 ph/cm2/s
Error -------- 9.46e-02 7.88e-02 -------- 2.47e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.016 0.101 - - 3.41e-03 2.08e-04 58.640 57
CPL 1.621 0.412 43.2 0.0 5.58e-03 0.00e+00 55.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.494 0.197 - - 1.34e-02 1.71e-03 57.010 57
CPL 0.202 0.999 74.7 31.0 5.56e-02 7.55e-02 50.460 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: 22.848000 sec.
T50 in the 50-300 keV band: 9.408000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 66.196 -21.336 44.860
T90 46.812 -16.768 30.044
T50 13.676 -6.612 7.064
Peak 1.000 -0.288 0.712
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
140.9422 +39.8290 0.0061 32.6 -28.8 3.2684 31.4 TRIG_01257556
------------------------------------------
Foreground time interval of the image:
-21.336 16.049 (delta_t = 37.385 [sec])
Background time interval of the image:
-239.152 -21.336 (delta_t = 217.816 [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 -21.336 sec. to 44.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01638 ( -0.100116 0.102479 )
Norm@50keV : 3.40763E-03 ( -0.000209446 0.00020718 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.64 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.149650e-01
Photon flux (15-150 keV) in 66.2 sec: 0.515033 ( -0.0279321 0.0279871 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08223e-06 ( -1.20736e-07 1.21525e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.336 sec. to 44.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62123 ( -0.440276 0.382828 )
Epeak [keV] : 43.2379 ( )
Norm@50keV : 5.58022E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 0.9960 for 56 degrees of freedom
# Null hypothesis probability = 4.833088e-01
Photon flux (15-150 keV) in 66.2 sec: 0.503656 ( -0.030059 0.030087 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01045e-06 ( -1.39722e-07 1.40556e-07 ) ergs/cm2
Band function
Time interval is from -21.336 sec. to 44.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62122 ( 1.75703 0.582967 )
beta : -10.00000 ( 10 4.26326e-14 )
Epeak [keV] : 43.2296 ( -9.73734 29.8256 )
Norm@50keV : 5.57915E-03 ( -0.000290386 0.00401267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.454518e-01
Photon flux (15-150 keV) in 66.2 sec: 0.503297 ( 6.4967 -0.030092 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00973e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8961 ( )
R^2/D10^2 : 0.165526 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 133.76 using 59 PHA bins.
# Reduced chi-squared = 2.3466 for 57 degrees of freedom
# Null hypothesis probability = 4.118925e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.713e-07 2.443e-08
25- 50 7.578e-07 4.435e-08
50-150 5.045e-07 6.769e-08
15-150 1.534e-06 9.467e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.3020 (-10.7916 13.9811)
Norm : 2.48459 (-0.219567 0.246009)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.222e-07 3.340e-08
25- 50 6.725e-07 3.836e-08
50-150 8.665e-07 1.092e-07
15-150 1.961e-06 1.235e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.31609 (-0.928622 1.0948)
R1^2/D10^2 : 1.77066 (-0.882278 2.1088)
kT2 [keV] : 17.8618 (-2.51956 3.86103)
R2^2/D10^2 : 1.87383E-02 (-0.0104348 0.0169729)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.415e-07 1.005e-07
25- 50 6.395e-07 1.031e-07
50-150 8.590e-07 1.737e-07
15-150 1.940e-06 2.909e-07
Peak spectrum fit
Power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49366 ( -0.196031 0.198637 )
Norm@50keV : 1.34278E-02 ( -0.00171317 0.0017086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.748716e-01
Photon flux (15-150 keV) in 1 sec: 1.67348 ( -0.216782 0.217278 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2751e-07 ( -1.73291e-08 1.74422e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.201706 ( -1.10652 0.891953 )
Epeak [keV] : 74.6535 ( -14.3152 47.6725 )
Norm@50keV : 5.56089E-02 ( -0.034153 0.116854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.46 using 59 PHA bins.
# Reduced chi-squared = 0.9010 for 56 degrees of freedom
# Null hypothesis probability = 6.839359e-01
Photon flux (15-150 keV) in 1 sec: 1.60593 ( -0.22485 0.22372 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22614e-07 ( -1.7567e-08 1.7819e-08 ) ergs/cm2
Band function
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.201508 ( -0.595251 1.63833 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 74.6220 ( -14.2874 47.6383 )
Norm@50keV : 5.56399E-02 ( -0.0341884 0.1167 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.46 using 59 PHA bins.
# Reduced chi-squared = 0.9174 for 55 degrees of freedom
# Null hypothesis probability = 6.486896e-01
Photon flux (15-150 keV) in 1 sec: 1.64453 ( 5.35547 -0.28845 ) 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] : 16.7834 (-2.07704 2.35886)
R^2/D10^2 : 0.138397 (-0.0519128 0.0819253)
(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 7.967e-09 1.817e-09
25- 50 3.489e-08 6.810e-09
50-150 6.987e-08 1.597e-08
15-150 1.127e-07 2.017e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.358 (-73.6884 -199.361)
Norm : 6.96370 (-0.868975 0.870255)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.734e-08 9.720e-09
25- 50 3.336e-08 1.871e-08
50-150 7.316e-08 4.015e-08
15-150 1.238e-07 6.895e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.32116 (-2.49942 3.7719)
R1^2/D10^2 : 7.03612 (-4.50297 1120.11)
kT2 [keV] : 19.0992 (-2.86646 4.2491)
R2^2/D10^2 : 8.08517E-02 (-0.0453453 0.0788517)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.498e-08 7.199e-09
25- 50 3.205e-08 1.069e-08
50-150 7.504e-08 2.450e-08
15-150 1.221e-07 3.377e-08
Plot creation:
Wed Oct 2 23:44:01 EDT 2024