batgrbproduct analysis for trigger=1306404
batgrbproduct Analysis for Trigger=1306404
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 Apr 26 04:53:12 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1306404/batgroup_hand_proc
======================================================================
Trigger: 01306404 Segment: 000
BAT Trigger Time: 767170384 [s; MET]
Trigger Stop: 767170448 [s; MET]
UTC: 2025-04-24T06:52:28.516940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 217.513592266472 Dec: -35.0222873990142 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.17
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.17
Flight Position: [ source = BAT ]
RA: 217.513592266472 Dec: -35.0222873990142 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 217.527859134191 Dec: -35.0251676884273 [deg; J2000]
{ 14h 30m 06.7s , -35d 01' 30.6" }
+/- 0.733284017710122 [arcmin] (estimated 90% radius based on SNR)
+/- 0.270439528466056 [arcmin] (formal 1-sigma fit error)
SNR: 47.3790815856891
Angular difference between Flight and Ground position is 0.721989 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 19.027999997139 +/- 1.05848949844132
Measured from: -20.7599999904633
to: -1.73199999332428 [s; relative to TRIGTIME]
T50: 5.73999989032745 +/- 0.143387559628328
Measured from: -16.3519999980927
to: -10.6120001077652 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -15.3799999952316
to: -14.3799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.7480000257492
to: 262.667999982834 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 15.118474 20.357551 13.357909 2.977833
0.176438 0.187184 0.156645 0.117834 [error]
Peak 1.341474 2.025321 1.555604 0.392186
0.031035 0.037285 0.033723 0.019836 [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 5.86e-06 9.03e-06 1.05e-05 2.33e-05 3.22e-05 4.87e-05 erg/cm2
Error 2.03e-07 1.81e-07 1.94e-07 1.00e-06 5.17e-07 1.08e-06 erg/cm2
Peak flux Power-law 1.59e+01 1.57e+01 1.08e+01 1.16e+01 4.70e+01 5.40e+01 ph/cm2/s
Error 7.60e-01 4.48e-01 2.96e-01 6.79e-01 1.26e+00 1.29e+00 ph/cm2/s
Fluence Cutoff-PL 5.46e-06 9.11e-06 1.07e-05 1.76e-05 3.17e-05 4.29e-05 erg/cm2
Error 2.75e-07 1.88e-07 2.28e-07 2.44e-06 5.73e-07 2.53e-06 erg/cm2
Peak flux Cutoff-PL 1.48e+01 1.59e+01 1.11e+01 8.93e+00 4.61e+01 5.07e+01 ph/cm2/s
Error 9.90e-01 4.74e-01 3.63e-01 1.41e+00 1.36e+00 2.08e+00 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 1.788 0.031 - - 1.16e-02 1.87e-04 58.540 57
CPL 1.541 0.127 106.5 33.7 1.49e-02 1.86e-03 47.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.542 0.043 - - 3.72e-01 8.86e-03 50.360 57
CPL 1.255 0.176 146.0 81.1 5.02e-01 9.05e-02 42.130 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: 15.488000 sec.
T50 in the 50-300 keV band: 4.864000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 301.416 -38.748 262.668
T90 19.028 -20.760 -1.732
T50 5.740 -16.352 -10.612
Peak 1.000 -15.380 -14.380
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
217.5279 -35.0252 0.0041 35.2 149.9 46.7178 47.4 TRIG_01306404
------------------------------------------
Foreground time interval of the image:
-18.299 118.301 (delta_t = 136.600 [sec])
Background time interval of the image:
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 -38.748 sec. to 262.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78777 ( -0.0309036 0.0308806 )
Norm@50keV : 1.16108E-02 ( -0.000187157 0.000187126 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.185701e-01
Photon flux (15-150 keV) in 301.4 sec: 1.59242 ( -0.0332525 0.0334273 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22314e-05 ( -5.16964e-07 5.16967e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.748 sec. to 262.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54058 ( -0.129161 0.125724 )
Epeak [keV] : 106.546 ( -17.9993 49.3348 )
Norm@50keV : 1.48807E-02 ( -0.00172324 0.00200322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.05 using 59 PHA bins.
# Reduced chi-squared = 0.8403 for 56 degrees of freedom
# Null hypothesis probability = 7.970387e-01
Photon flux (15-150 keV) in 301.4 sec: 1.55092 ( -0.03836 0.03868 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17413e-05 ( -5.72359e-07 5.73564e-07 ) ergs/cm2
Band function
Time interval is from -38.748 sec. to 262.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.571167 ( -0.731331 2.71602 )
beta : -1.85631 ( -0.0563868 0.0505883 )
Epeak [keV] : 42.2105 ( -12.7717 22.7593 )
Norm@50keV : 6.13310E-02 ( -0.0649642 5.84755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.51 using 59 PHA bins.
# Reduced chi-squared = 0.7547 for 55 degrees of freedom
# Null hypothesis probability = 9.106411e-01
Photon flux (15-150 keV) in 301.4 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] : 16.0421 ( )
R^2/D10^2 : 0.121807 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 895.33 using 59 PHA bins.
# Reduced chi-squared = 15.708 for 57 degrees of freedom
# Null hypothesis probability = 5.642995e-151
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.952e-06 7.083e-08
25- 50 8.234e-06 1.899e-07
50-150 1.483e-05 3.978e-07
15-150 2.501e-05 4.250e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 132.071 (-8.24476 10.4091)
Norm : 6.42538 (-0.171841 0.163284)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.850e-06 2.291e-07
25- 50 8.891e-06 3.346e-07
50-150 1.701e-05 3.248e-06
15-150 3.075e-05 3.352e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.63954 (-0.425046 0.440788)
R1^2/D10^2 : 1.30938 (-0.239202 0.307355)
kT2 [keV] : 26.8875 (-1.502 1.76033)
R2^2/D10^2 : 1.38573E-02 (-0.0030106 0.00351624)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.520e-06 2.622e-07
25- 50 9.440e-06 2.833e-07
50-150 1.712e-05 5.576e-07
15-150 3.108e-05 8.650e-07
Peak spectrum fit
Power-law model
Time interval is from -15.380 sec. to -14.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54197 ( -0.0428232 0.0428662 )
Norm@50keV : 0.372166 ( -0.00885998 0.00885997 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.36 using 59 PHA bins.
# Reduced chi-squared = 0.8835 for 57 degrees of freedom
# Null hypothesis probability = 7.206703e-01
Photon flux (15-150 keV) in 1 sec: 47.0052 ( -1.25983 1.26327 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50768e-06 ( -8.61939e-08 8.62356e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.380 sec. to -14.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25491 ( -0.179177 0.172574 )
Epeak [keV] : 146.029 ( -35.2651 126.975 )
Norm@50keV : 0.501888 ( -0.0807221 0.100204 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.13 using 59 PHA bins.
# Reduced chi-squared = 0.7524 for 56 degrees of freedom
# Null hypothesis probability = 9.151329e-01
Photon flux (15-150 keV) in 1 sec: 46.0975 ( -1.3537 1.36 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46176e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -15.380 sec. to -14.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.723565 ( -0.536513 1.62588 )
beta : -1.66428 ( -0.142207 0.0787004 )
Epeak [keV] : 65.1604 ( -19.9051 63.0214 )
Norm@50keV : 1.04186 ( -0.868878 11.6231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.55 using 59 PHA bins.
# Reduced chi-squared = 0.6827 for 55 degrees of freedom
# Null hypothesis probability = 9.653671e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43839e-06 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.6635 ( )
R^2/D10^2 : 3.59060 ( )
(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 2.041e-07 1.015e-08
25- 50 8.887e-07 2.930e-08
50-150 1.750e-06 7.000e-08
15-150 2.843e-06 8.200e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.60765 -200)
Norm : 192.160 (-4.57258 4.57258)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.786e-07 1.405e-08
25- 50 9.207e-07 2.490e-08
50-150 2.019e-06 5.500e-08
15-150 3.419e-06 9.600e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.51592 (-0.733843 0.767914)
R1^2/D10^2 : 24.9924 (-5.89492 8.42618)
kT2 [keV] : 30.9530 (-3.03785 4.09632)
R2^2/D10^2 : 0.307513 (-0.109511 0.143012)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.872e-07 3.035e-08
25- 50 9.476e-07 4.435e-08
50-150 2.100e-06 1.485e-07
15-150 3.435e-06 2.020e-07
Plot creation:
Sat Apr 26 05:05:09 EDT 2025