batgrbproduct analysis for trigger=1297832
batgrbproduct Analysis for Trigger=1297832
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): Sun Mar 23 17:46:21 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1297832/GCN5_download_cron
======================================================================
Trigger: 01297832 Segment: 000
BAT Trigger Time: 764352408.128 [s; MET]
Trigger Stop: 764352408.192 [s; MET]
UTC: 2025-03-22T16:06:12.837500 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 106.733611936176 Dec: 7.19908023351788 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.28
Image Trigger?: NO
Rate S/N Ratio: 41.3158565202272 [ if not an image trigger ]
Image S/N Ratio: 7.28
Flight Position: [ source = BAT ]
RA: 106.733611936176 Dec: 7.19908023351788 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 106.775227478262 Dec: 7.19660580634777 [deg; J2000]
{ 07h 07m 06.1s , +07d 11' 47.8" }
+/- 1.54547926696165 [arcmin] (estimated 90% radius based on SNR)
+/- 0.527644289461625 [arcmin] (formal 1-sigma fit error)
SNR: 16.331576824991
Angular difference between Flight and Ground position is 2.481700 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.623999953269958 +/- 0.0486620812716356
Measured from: 0.00400006771087646
to: 0.628000020980835 [s; relative to TRIGTIME]
T50: 0.360000014305115 +/- 0.0481664313780741
Measured from: 0.0600000619888306
to: 0.420000076293945 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.162000060081482
to: 0.837999939918518 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.671999931335449 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021379 0.063989 0.069790 0.033604
0.005653 0.006917 0.006513 0.005406 [error]
Peak 0.024681 0.063486 0.072287 0.035082
0.006606 0.007858 0.007155 0.005862 [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 6.78e-09 2.11e-08 5.36e-08 3.90e-07 1.46e-07 4.72e-07 erg/cm2
Error 1.64e-09 3.09e-09 5.84e-09 9.91e-08 1.64e-08 1.01e-07 erg/cm2
Peak flux Power-law 2.15e-01 3.68e-01 4.81e-01 1.28e+00 1.41e+00 2.34e+00 ph/cm2/s
Error 5.96e-02 6.29e-02 5.39e-02 3.17e-01 1.66e-01 3.20e-01 ph/cm2/s
Fluence Cutoff-PL 5.78e-09 2.20e-08 5.77e-08 1.78e-07 1.42e-07 2.63e-07 erg/cm2
Error 1.96e-09 3.51e-09 7.54e-09 1.57e-07 1.78e-08 1.74e-07 erg/cm2
Peak flux Cutoff-PL 1.92e-01 3.75e-01 5.07e-01 8.58e-01 1.40e+00 1.93e+00 ph/cm2/s
Error 7.24e-02 6.76e-02 7.26e-02 5.14e-01 1.68e-01 5.17e-01 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 0.651 0.187 - - 1.74e-02 2.01e-03 74.830 57
CPL 0.017 0.805 183.7 -53.9 3.29e-02 3.10e-02 72.760 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.614 0.207 - - 1.21e-02 1.55e-03 68.240 57
CPL 0.214 0.734 269.2 0.0 1.79e-02 1.62e-02 67.520 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: 0.640000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.672 0.000 0.672
T90 0.624 0.004 0.628
T50 0.360 0.060 0.420
Peak 1.000 -0.162 0.838
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
106.7752 +7.1966 0.0117 14.5 165.8 0.2046 16.3 TRIG_01297832
------------------------------------------
Foreground time interval of the image:
0.000 0.672 (delta_t = 0.672 [sec])
Background time interval of the image:
-239.128 -233.738 (delta_t = 5.390 [sec])
-232.128 -162.998 (delta_t = 69.130 [sec])
-162.128 -137.538 (delta_t = 24.590 [sec])
-136.128 0.000 (delta_t = 136.128 [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 0.000 sec. to 0.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.651474 ( -0.192775 0.180714 )
Norm@50keV : 1.73769E-02 ( -0.00202771 0.00199497 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.83 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 57 degrees of freedom
# Null hypothesis probability = 5.671194e-02
Photon flux (15-150 keV) in 0.672 sec: 2.01732 ( -0.220256 0.220782 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45742e-07 ( -1.63522e-08 1.64157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70647E-02 ( -0.910233 0.699027 )
Epeak [keV] : 183.679 ( -75.7827 -183.635 )
Norm@50keV : 3.29089E-02 ( -0.0163535 0.0457457 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.76 using 59 PHA bins.
# Reduced chi-squared = 1.299 for 56 degrees of freedom
# Null hypothesis probability = 6.550329e-02
Photon flux (15-150 keV) in 0.672 sec: 1.98515 ( -0.22412 0.22421 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41734e-07 ( -1.79968e-08 1.75164e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.949005 ( -0.383944 0.262403 )
Epeak [keV] : 43.1063 ( -10.8597 10.14 )
Norm@50keV : 49.0100 ( -5.09436 181.337 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.70 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 55 degrees of freedom
# Null hypothesis probability = 1.167663e-01
Photon flux (15-150 keV) in 0.672 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] : 26.0835 (-3.77935 4.9524)
R^2/D10^2 : 4.69969E-02 (-0.0186186 0.0280621)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.68 using 59 PHA bins.
# Reduced chi-squared = 1.380 for 57 degrees of freedom
# Null hypothesis probability = 3.010193e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.648e-09 7.674e-10
25- 50 2.114e-08 3.696e-09
50-150 1.059e-07 1.700e-08
15-150 1.307e-07 1.942e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 7.41520 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.241e-08 6.959e-09
25- 50 2.387e-08 1.324e-08
50-150 5.235e-08 2.871e-08
15-150 8.862e-08 4.932e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 16.2193 (-5.49746 4.56603)
R1^2/D10^2 : 0.138647 (-0.0586449 0.14009)
kT2 [keV] : 200.000 (-157.884 -200)
R2^2/D10^2 : 3.95498E-04 (-0.000161075 0.00225257)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.467e-09 3.119e-09
25- 50 2.414e-08 1.430e-08
50-150 1.084e-07 5.853e-08
15-150 1.380e-07 7.194e-08
Peak spectrum fit
Power-law model
Time interval is from -0.162 sec. to 0.838 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.613559 ( -0.214909 0.198921 )
Norm@50keV : 1.21090E-02 ( -0.00156413 0.00152678 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.24 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.463904e-01
Photon flux (15-150 keV) in 1 sec: 1.41151 ( -0.165769 0.166425 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53849e-07 ( -1.79748e-08 1.80315e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.162 sec. to 0.838 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.213511 ( -0.952467 0.514952 )
Epeak [keV] : 269.166 ( -269.151 -269.151 )
Norm@50keV : 1.79302E-02 ( -0.00700632 0.0254705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.52 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 56 degrees of freedom
# Null hypothesis probability = 1.392808e-01
Photon flux (15-150 keV) in 1 sec: 1.39725 ( -0.16802 0.16863 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51612e-07 ( -1.9293e-08 1.8817e-08 ) ergs/cm2
Band function
Time interval is from -0.162 sec. to 0.838 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.828493 ( -0.371977 0.268554 )
Epeak [keV] : 40.3665 ( -12.3701 13.002 )
Norm@50keV : 46.4458 ( -5.1022 281.492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.56 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 2.003667e-01
Photon flux (15-150 keV) in 1 sec: ( ) 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] : 27.7815 (-4.44901 6.14508)
R^2/D10^2 : 2.73956E-02 (-0.0118452 0.0185457)
(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 3.464e-09 8.025e-10
25- 50 2.067e-08 3.970e-09
50-150 1.157e-07 2.317e-08
15-150 1.398e-07 2.265e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 5.31054 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.322e-08 7.500e-09
25- 50 2.544e-08 1.418e-08
50-150 5.579e-08 3.106e-08
15-150 9.445e-08 5.265e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 15.8807 (-3.84166 4.60896)
R1^2/D10^2 : 9.86609E-02 (-0.0446243 0.114558)
kT2 [keV] : 200.000 (-151.911 -200)
R2^2/D10^2 : 3.05943E-04 (-0.000115522 0.00160931)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.657e-09 3.239e-09
25- 50 2.478e-08 1.452e-08
50-150 1.209e-07 6.250e-08
15-150 1.513e-07 1.015e-07
Plot creation:
Sun Mar 23 17:49:30 EDT 2025