batgrbproduct analysis for trigger=1278305
batgrbproduct Analysis for Trigger=1278305
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): Thu Jan 2 14:41:29 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1278305/batgroup_hand_proc
======================================================================
Trigger: 01278305 Segment: 000
BAT Trigger Time: 757430604.864 [s; MET]
Trigger Stop: 757430608.96 [s; MET]
UTC: 2025-01-01T13:22:50.046640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 37.0612933026417 Dec: 19.1540778787435 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.96
Image Trigger?: NO
Rate S/N Ratio: 7.21110255092798 [ if not an image trigger ]
Image S/N Ratio: 6.96
Flight Position: [ source = BAT ]
RA: 37.0612933026417 Dec: 19.1540778787435 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 37.057213311308 Dec: 19.1806969580565 [deg; J2000]
{ 02h 28m 13.7s , +19d 10' 50.5" }
+/- 1.87554806758316 [arcmin] (estimated 90% radius based on SNR)
+/- 0.851780008839564 [arcmin] (formal 1-sigma fit error)
SNR: 12.3861187265639
Angular difference between Flight and Ground position is 1.613796 arcmin
Partial Coding Fraction: 0.4765625 [ including projection effects ]
Duration
T90: 34.1920000314713 +/- 7.70748884038869
Measured from: 0.519999980926514
to: 34.7120000123978 [s; relative to TRIGTIME]
T50: 15.067999958992 +/- 5.87184869877421
Measured from: 4.58000004291534
to: 19.6480000019073 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.952000021934509
to: 1.95200002193451 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.21999990940094
to: 36.4960000514984 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.459937 0.475535 0.226431 0.000704
0.051903 0.053340 0.044448 0.037518 [error]
Peak 0.022007 0.042277 0.035293 0.011513
0.008426 0.009298 0.007996 0.006393 [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 1.55e-07 1.96e-07 1.80e-07 2.90e-07 6.30e-07 8.22e-07 erg/cm2
Error 2.63e-08 2.55e-08 4.23e-08 1.31e-07 9.79e-08 1.83e-07 erg/cm2
Peak flux Power-law 2.40e-01 2.72e-01 2.22e-01 3.03e-01 8.44e-01 1.04e+00 ph/cm2/s
Error 9.84e-02 7.50e-02 5.99e-02 1.55e-01 2.13e-01 2.57e-01 ph/cm2/s
Fluence Cutoff-PL 1.50e-07 2.11e-07 1.72e-07 1.03e-07 5.94e-07 6.35e-07 erg/cm2
Error 2.82e-08 3.54e-08 5.12e-08 2.01e-07 1.11e-07 2.40e-07 erg/cm2
Peak flux Cutoff-PL 1.34e-01 3.51e-01 2.74e-01 3.66e-02 7.92e-01 7.95e-01 ph/cm2/s
Error 1.10e-01 1.07e-01 8.58e-02 7.22e-02 2.17e-01 2.22e-01 ph/cm2/s
Fluence Band 1.49e-07 2.12e-07 1.65e-07 2.09e-07 6.06e-07 7.39e-07 erg/cm2
Error 3.00e-08 -------- 4.84e-08 -------- 1.02e-07 -------- erg/cm2
Peak flux Band 1.20e-01 3.63e-01 2.60e-01 9.32e-02 7.97e-01 8.37e-01 ph/cm2/s
Error 1.01e-01 1.13e-01 8.64e-02 1.34e-01 2.12e-01 2.52e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.121 0.243 - - 1.84e-03 3.17e-04 58.480 57
CPL 1.548 0.876 31.1 -1.7 4.08e-03 1.15e-02 57.430 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.295 0.357 - - 7.08e-03 1.73e-03 59.290 57
CPL -1.855 3.362 61.2 22.6 2.63e-01 1.61e+01 52.470 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 36.716 -0.220 36.496
T90 34.192 0.520 34.712
T50 15.068 4.580 19.648
Peak 1.000 0.952 1.952
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
37.0572 +19.1807 0.0156 31.5 140.9 1.2254 12.4 TRIG_01278305
------------------------------------------
Foreground time interval of the image:
-0.220 35.637 (delta_t = 35.857 [sec])
Background time interval of the image:
-239.864 -0.220 (delta_t = 239.644 [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 -0.220 sec. to 36.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12065 ( -0.233549 0.252545 )
Norm@50keV : 1.84415E-03 ( -0.000320961 0.000312356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.21e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 36.72 sec: 0.293124 ( -0.0370378 0.0370395 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30479e-07 ( -9.66037e-08 9.92619e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.220 sec. to 36.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54776 ( -1.21799 0.533844 )
Epeak [keV] : 31.0751 ( -27.6109 -31.0755 )
Norm@50keV : 4.08422E-03 ( -0.00408441 0.0189259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.43 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.22e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 36.72 sec: 0.288179 ( -0.037814 0.03786 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94166e-07 ( -1.07288e-07 1.15069e-07 ) ergs/cm2
Band function
Time interval is from -0.220 sec. to 36.496 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.15924E-02 ( -0.0700144 -0.0700144 )
beta : -2.37008 ( 2.37214 0.396979 )
Epeak [keV] : 26.8825 ( -26.739 294.763 )
Norm@50keV : 5.93533E-02 ( -0.0778718 308.272 )
------------------------------------------------------------
Photon flux (15-150 keV) in 36.72 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.06005e-07 ( -6.05748e-07 -1.00143e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.68486 (-1.26842 1.48798)
R^2/D10^2 : 0.233669 (-0.10795 0.202073)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 69.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.30e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.236e-07 2.805e-08
25- 50 2.482e-07 4.520e-08
50-150 8.479e-08 3.154e-08
15-150 4.565e-07 7.430e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.5862 (-15.7772 27.2794)
Norm : 1.62532 (-0.325015 0.439887)
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.53 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.55e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.475e-07 2.464e-08
25- 50 2.157e-07 3.323e-08
50-150 2.194e-07 8.133e-08
15-150 5.826e-07 1.021e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.60414 (-1.69035 1.86199)
R1^2/D10^2 : 0.971179 (-0.617481 1.06068)
kT2 [keV] : 18.5460 (-6.43905 18.9849)
R2^2/D10^2 : 7.69467E-03 (-0.00664254 0.0317982)
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.53 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.18e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.533e-07 8.109e-08
25- 50 2.058e-07 1.017e-07
50-150 2.369e-07 1.411e-07
15-150 5.960e-07 2.748e-07
Peak spectrum fit
Power-law model
Time interval is from 0.952 sec. to 1.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29483 ( -0.362859 0.350473 )
Norm@50keV : 7.08324E-03 ( -0.00173125 0.0017312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.92e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.844152 ( -0.212704 0.214112 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00899e-08 ( -1.79765e-08 1.81793e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.952 sec. to 1.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.85466 ( -4.47303 2.25156 )
Epeak [keV] : 61.1504 ( -12.1643 33.1228 )
Norm@50keV : 0.262640 ( -0.264831 31.8513 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.47 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.09e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.792407 ( -0.214928 0.218183 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10729e-08 ( -1.72748e-08 1.90009e-08 ) ergs/cm2
Band function
Time interval is from 0.952 sec. to 1.952 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.79055 ( -1.32498 2.85709 )
beta : -9.99999 ( 9.99999 2.86685e-05 )
Epeak [keV] : 61.4682 ( -11.5111 32.9145 )
Norm@50keV : 0.244041 ( -0.0556069 4.96277 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 0.796797 ( 6.2032 -0.209213 ) 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] : 16.0430 (-3.08824 4.12245)
R^2/D10^2 : 9.09806E-02 (-0.0513022 0.101526)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.60 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.41e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.839e-09 2.016e-09
25- 50 2.041e-08 8.200e-09
50-150 3.675e-08 1.669e-08
15-150 6.200e-08 2.696e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-92.7836 -199.363)
Norm : 3.59285 (-0.877968 0.877935)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.24 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.94e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.947e-09 5.470e-09
25- 50 1.721e-08 9.965e-09
50-150 3.774e-08 2.220e-08
15-150 6.390e-08 3.879e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 2.36181E-05 (-2.36191e-05 -2.36191e-05)
kT2 [keV] : 15.2524 (-3.69102 4.7605)
R2^2/D10^2 : 0.103640 (-0.0628988 0.0849217)
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.44 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.73e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.873e-09 1.791e-05
25- 50 2.038e-08 1.574e-04
50-150 3.686e-08 3.788e-03
15-150 6.212e-08 3.636e-03
Plot creation:
Thu Jan 2 16:28:38 EST 2025