batgrbproduct analysis for trigger=1262764
batgrbproduct Analysis for Trigger=1262764
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 Oct 29 11:58:06 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1262764/batgroup_hand_proc
======================================================================
Trigger: 01262764 Segment: 000
BAT Trigger Time: 751675386.432 [s; MET]
Trigger Stop: 751675387.456 [s; MET]
UTC: 2024-10-26T22:42:32.007860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 293.423540289295 Dec: 57.9803069280196 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.81
Image Trigger?: NO
Rate S/N Ratio: 35.8608421540822 [ if not an image trigger ]
Image S/N Ratio: 6.81
Flight Position: [ source = BAT ]
RA: 293.423540289295 Dec: 57.9803069280196 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.424564110868 Dec: 57.9963009106833 [deg; J2000]
{ 19h 33m 41.9s , +57d 59' 46.7" }
+/- 1.24957317029744 [arcmin] (estimated 90% radius based on SNR)
+/- 0.464903835064253 [arcmin] (formal 1-sigma fit error)
SNR: 22.1252094983814
Angular difference between Flight and Ground position is 0.960191 arcmin
Partial Coding Fraction: 0.1796875 [ including projection effects ]
Duration
T90: 25.2000000476837 +/- 5.60046278727398
Measured from: -0.600000023841858
to: 24.6000000238419 [s; relative to TRIGTIME]
T50: 9.20000004768372 +/- 1.86370809327362
Measured from: 1.14399993419647
to: 10.3439999818802 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.29200005531311
to: 0.70799994468689 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.33600008487701
to: 30.9839999675751 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.933741 1.382327 1.157292 0.228457
0.085185 0.090428 0.077575 0.061730 [error]
Peak 0.101760 0.148834 0.180797 0.044134
0.017160 0.019710 0.019290 0.014713 [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 3.52e-07 6.25e-07 8.50e-07 2.39e-06 2.46e-06 4.21e-06 erg/cm2
Error 4.27e-08 4.68e-08 7.60e-08 4.53e-07 1.86e-07 5.11e-07 erg/cm2
Peak flux Power-law 1.22e+00 1.30e+00 9.88e-01 1.22e+00 3.97e+00 4.73e+00 ph/cm2/s
Error 2.67e-01 1.78e-01 1.47e-01 3.72e-01 5.03e-01 5.94e-01 ph/cm2/s
Fluence Cutoff-PL 3.15e-07 6.61e-07 8.91e-07 1.11e-06 2.38e-06 2.98e-06 erg/cm2
Error 5.14e-08 5.66e-08 8.64e-08 6.98e-07 1.99e-07 7.11e-07 erg/cm2
Peak flux Cutoff-PL 1.14e+00 1.33e+00 1.03e+00 9.28e-01 3.93e+00 4.43e+00 ph/cm2/s
Error 3.27e-01 1.97e-01 1.80e-01 5.61e-01 5.11e-01 7.83e-01 ph/cm2/s
Fluence Band 3.12e-07 6.59e-07 8.89e-07 1.12e-06 2.38e-06 2.99e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.12e+00 1.34e+00 1.04e+00 8.72e-01 3.92e+00 4.36e+00 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 1.556 0.119 - - 8.09e-03 5.75e-04 53.260 57
CPL 0.957 0.512 90.1 81.1 1.59e-02 9.76e-03 48.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.398 0.208 - - 3.26e-02 4.04e-03 39.570 57
CPL 1.111 0.668 172.3 0.0 4.44e-02 4.13e-02 39.160 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: 11.456000 sec.
T50 in the 50-300 keV band: 4.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 32.320 -1.336 30.984
T90 25.200 -0.600 24.600
T50 9.200 1.144 10.344
Peak 1.000 -0.292 0.708
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.4246 +57.9963 0.0087 41.2 43.9 3.2814 22.1 TRIG_01262764
------------------------------------------
Foreground time interval of the image:
-1.336 15.269 (delta_t = 16.605 [sec])
Background time interval of the image:
-239.432 -1.336 (delta_t = 238.096 [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 -1.336 sec. to 30.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55565 ( -0.118869 0.119577 )
Norm@50keV : 8.08767E-03 ( -0.00057547 0.00057436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9345 for 57 degrees of freedom
# Null hypothesis probability = 6.160099e-01
Photon flux (15-150 keV) in 32.32 sec: 1.02553 ( -0.0753104 0.0754835 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45882e-06 ( -1.85887e-07 1.86604e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.336 sec. to 30.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.956842 ( -0.540555 0.482832 )
Epeak [keV] : 90.0799 ( -21.4689 140.733 )
Norm@50keV : 1.59331E-02 ( -0.00658226 0.0129332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 56 degrees of freedom
# Null hypothesis probability = 7.457549e-01
Photon flux (15-150 keV) in 32.32 sec: 0.998283 ( -0.078416 0.078507 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37855e-06 ( -1.98888e-07 1.98842e-07 ) ergs/cm2
Band function
Time interval is from -1.336 sec. to 30.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.956924 ( -0.440507 0.385863 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 90.0713 ( -17.2648 141.336 )
Norm@50keV : 1.59305E-02 ( -0.00657952 0.0129302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.67 using 59 PHA bins.
# Reduced chi-squared = 0.8850 for 55 degrees of freedom
# Null hypothesis probability = 7.135241e-01
Photon flux (15-150 keV) in 32.32 sec: 1.00681 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37715e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.4269 (-1.28006 1.40749)
R^2/D10^2 : 0.105228 (-0.0284499 0.0385235)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.45 using 59 PHA bins.
# Reduced chi-squared = 1.499 for 57 degrees of freedom
# Null hypothesis probability = 8.700077e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.686e-07 2.484e-08
25- 50 6.873e-07 6.496e-08
50-150 1.127e-06 1.508e-07
15-150 1.983e-06 1.715e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-58.4926 -199.363)
Norm : 4.19195 (-0.292565 0.32959)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.374e-07 2.873e-08
25- 50 6.490e-07 6.933e-08
50-150 1.423e-06 3.633e-07
15-150 2.410e-06 4.121e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.68205 (-1.69036 2.01099)
R1^2/D10^2 : 1.12702 (-0.642349 2.11489)
kT2 [keV] : 22.9287 (-3.71053 6.43426)
R2^2/D10^2 : 2.06135E-02 (-0.0127543 0.0125322)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.119e-07 1.303e-07
25- 50 6.545e-07 1.619e-07
50-150 1.396e-06 3.878e-07
15-150 2.362e-06 5.963e-07
Peak spectrum fit
Power-law model
Time interval is from -0.292 sec. to 0.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39830 ( -0.206753 0.209553 )
Norm@50keV : 3.26097E-02 ( -0.0040478 0.00403897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.6942 for 57 degrees of freedom
# Null hypothesis probability = 9.618463e-01
Photon flux (15-150 keV) in 1 sec: 3.96973 ( -0.502944 0.503803 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15207e-07 ( -4.27385e-08 4.29561e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.292 sec. to 0.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11139 ( -0.866363 0.468705 )
Epeak [keV] : 172.310 ( -172.32 -172.32 )
Norm@50keV : 4.44371E-02 ( -0.0194763 0.0631829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.16 using 59 PHA bins.
# Reduced chi-squared = 0.6993 for 56 degrees of freedom
# Null hypothesis probability = 9.573908e-01
Photon flux (15-150 keV) in 1 sec: 3.93115 ( -0.50906 0.51363 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12848e-07 ( -4.366e-08 4.3649e-08 ) ergs/cm2
Band function
Time interval is from -0.292 sec. to 0.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10051 ( -0.294102 0.415738 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 167.260 ( -87.1351 -167.27 )
Norm@50keV : 4.50120E-02 ( -0.0160021 0.0626375 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.16 using 59 PHA bins.
# Reduced chi-squared = 0.7121 for 55 degrees of freedom
# Null hypothesis probability = 9.474003e-01
Photon flux (15-150 keV) in 1 sec: 3.91699 ( ) 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] : 18.8913 (-2.71708 3.13206)
R^2/D10^2 : 0.215519 (-0.0875645 0.147836)
(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 1.515e-08 3.915e-09
25- 50 7.257e-08 1.348e-08
50-150 1.901e-07 3.765e-08
15-150 2.778e-07 4.855e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-52.0911 -200)
Norm : 16.4618 (-2.0342 2.0342)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.099e-08 2.299e-08
25- 50 7.886e-08 4.353e-08
50-150 1.729e-07 9.580e-08
15-150 2.928e-07 1.622e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.18014 (-1.58042 2.11767)
R1^2/D10^2 : 11.2736 (-8.33817 38.1367)
kT2 [keV] : 24.6678 (-4.34964 6.78772)
R2^2/D10^2 : 7.65264E-02 (-0.0437384 0.0749218)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.967e-08 2.054e-08
25- 50 6.834e-08 2.490e-08
50-150 2.086e-07 8.102e-08
15-150 3.166e-07 1.039e-07
Plot creation:
Tue Oct 29 12:07:25 EDT 2024