batgrbproduct analysis for trigger=1299965
batgrbproduct Analysis for Trigger=1299965
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 Apr 2 22:06:28 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1299965/batgroup_hand_proc
======================================================================
Trigger: 01299965 Segment: 000
BAT Trigger Time: 765087618.816 [s; MET]
Trigger Stop: 765087622.912 [s; MET]
UTC: 2025-03-31T04:19:43.475160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 71.3806240489717 Dec: 43.8047219565363 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.17
Image Trigger?: NO
Rate S/N Ratio: 9.21954445729289 [ if not an image trigger ]
Image S/N Ratio: 7.17
Flight Position: [ source = BAT ]
RA: 71.3806240489717 Dec: 43.8047219565363 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 71.3766667819925 Dec: 43.7941880079219 [deg; J2000]
{ 04h 45m 30.4s , +43d 47' 39.1" }
+/- 2.57381587156507 [arcmin] (estimated 90% radius based on SNR)
+/- 1.28803598969637 [arcmin] (formal 1-sigma fit error)
SNR: 7.88096013153049
Angular difference between Flight and Ground position is 0.654858 arcmin
Partial Coding Fraction: 0.5546875 [ including projection effects ]
Duration
T90: 3.95200002193451 +/- 0.770631020780319
Measured from: -0.480000019073486
to: 3.47200000286102 [s; relative to TRIGTIME]
T50: 2.1159999370575 +/- 1.00641339961253
Measured from: 0.424000024795532
to: 2.53999996185303 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.28400003910065
to: 2.28400003910065 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.720000028610229
to: 3.75999999046326 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.166276 0.105481 0.034620 -0.000670
0.019350 0.019666 0.016735 0.013721 [error]
Peak 0.037978 0.035040 0.020695 0.004900
0.009676 0.009597 0.008538 0.006712 [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 5.21e-08 4.91e-08 3.22e-08 3.27e-08 1.47e-07 1.66e-07 erg/cm2
Error 1.05e-08 1.02e-08 1.32e-08 2.50e-08 3.23e-08 4.63e-08 erg/cm2
Peak flux Power-law 3.76e-01 2.87e-01 1.47e-01 1.08e-01 8.60e-01 9.18e-01 ph/cm2/s
Error 1.55e-01 8.07e-02 6.49e-02 9.30e-02 2.44e-01 2.58e-01 ph/cm2/s
Fluence Cutoff-PL 5.13e-08 5.41e-08 2.52e-08 4.80e-09 1.35e-07 1.35e-07 erg/cm2
Error 1.10e-08 1.31e-08 1.88e-08 1.76e-08 2.73e-08 4.97e-08 erg/cm2
Peak flux Cutoff-PL 3.83e-01 2.87e-01 1.43e-01 1.02e-01 8.61e-01 9.19e-01 ph/cm2/s
Error 1.56e-01 6.58e-02 5.68e-02 1.14e-01 2.44e-01 2.82e-01 ph/cm2/s
Fluence Band 5.08e-08 5.31e-08 2.80e-08 8.29e-09 1.38e-07 1.41e-07 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 2.609 0.385 - - 3.18e-03 9.72e-04 44.420 57
CPL 1.611 0.000 13.0 0.0 1.46e-02 0.00e+00 43.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.969 0.539 - - 5.82e-03 1.99e-03 61.500 57
CPL 2.154 0.720 67.5 0.0 4.63e-03 0.00e+00 61.420 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 4.480 -0.720 3.760
T90 3.952 -0.480 3.472
T50 2.116 0.424 2.540
Peak 1.000 1.284 2.284
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
71.3767 +43.7942 0.0243 39.8 -179.8 0.2924 7.9 TRIG_01299965
------------------------------------------
Foreground time interval of the image:
-0.720 3.760 (delta_t = 4.480 [sec])
Background time interval of the image:
-183.315 -0.720 (delta_t = 182.595 [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 -0.720 sec. to 3.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.60915 ( -0.353509 0.415502 )
Norm@50keV : 3.17530E-03 ( -0.000969468 0.000975246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.42 using 59 PHA bins.
# Reduced chi-squared = 0.7792 for 57 degrees of freedom
# Null hypothesis probability = 8.877716e-01
Photon flux (15-150 keV) in 4.48 sec: 0.667933 ( -0.11493 0.114978 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46841e-07 ( -3.14004e-08 3.31574e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.720 sec. to 3.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61050 ( )
Epeak [keV] : 12.9614 ( )
Norm@50keV : 1.45747E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.17 using 59 PHA bins.
# Reduced chi-squared = 0.7709 for 56 degrees of freedom
# Null hypothesis probability = 8.952556e-01
Photon flux (15-150 keV) in 4.48 sec: 0.656232 ( -0.113506 0.115794 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34507e-07 ( -1.70948e-08 3.74963e-08 ) ergs/cm2
Band function
Time interval is from -0.720 sec. to 3.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62368 ( -1.07697 1.77396 )
beta : -10.0000 ( 10 2.4869e-14 )
Epeak [keV] : 13.0135 ( -7.92032 16.0977 )
Norm@50keV : 1.39876E-02 ( -0.0086378 1.86138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.18 using 59 PHA bins.
# Reduced chi-squared = 0.7851 for 55 degrees of freedom
# Null hypothesis probability = 8.759154e-01
Photon flux (15-150 keV) in 4.48 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3835e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.22453 (-1.11082 1.38565)
R^2/D10^2 : 2.08059 (-1.19848 2.83902)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8155 for 57 degrees of freedom
# Null hypothesis probability = 8.387667e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.049e-08 1.733e-08
25- 50 5.449e-08 1.966e-08
50-150 5.787e-09 3.947e-09
15-150 1.108e-07 3.709e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.0817 (-9.13894 15.1765)
Norm : 5.91831 (-1.941 3.31976)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.101e-08 1.248e-08
25- 50 5.496e-08 1.764e-08
50-150 2.620e-08 1.612e-08
15-150 1.322e-07 3.403e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.88835 (-1.8141 1.60147)
R1^2/D10^2 : 4.84393 (-2.42667 23.633)
kT2 [keV] : 15.4353 (-12.3291 27.7107)
R2^2/D10^2 : 2.31680E-02 (-0.0230458 0.63437)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.333e-08 2.970e-08
25- 50 5.075e-08 2.616e-08
50-150 3.556e-08 2.212e-08
15-150 1.396e-07 7.177e-08
Peak spectrum fit
Power-law model
Time interval is from 1.284 sec. to 2.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96908 ( -0.498715 0.579815 )
Norm@50keV : 5.81603E-03 ( -0.00207318 0.00191302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.181268e-01
Photon flux (15-150 keV) in 1 sec: 0.860231 ( -0.243707 0.243956 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35588e-08 ( -1.7302e-08 1.77019e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.284 sec. to 2.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15381 ( -0.86949 0.570123 )
Epeak [keV] : 67.4667 ( )
Norm@50keV : 4.62587E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.42 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 56 degrees of freedom
# Null hypothesis probability = 2.881616e-01
Photon flux (15-150 keV) in 1 sec: 0.861264 ( -0.244839 0.243086 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.34754e-08 ( -1.73025e-08 1.76035e-08 ) ergs/cm2
Band function
Time interval is from 1.284 sec. to 2.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87058 ( -4.87058 -4.87058 )
beta : -2.18360 ( -1.31433 0.633533 )
Epeak [keV] : 23.9874 ( -23.9874 88.5901 )
Norm@50keV : 998.521 ( -279.028 1.23523e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.21 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.628920e-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] : 7.72932 (-2.27475 4.32723)
R^2/D10^2 : 1.05224 (-1.0503 3.3334)
(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 1.107e-08 6.805e-09
25- 50 1.823e-08 1.135e-08
50-150 4.269e-09 3.485e-09
15-150 3.357e-08 2.036e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.8929 (-48.4523 -77.954)
Norm : 4.04294 (-1.49248 3.04516)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.047e-08 6.713e-09
25- 50 1.713e-08 1.031e-08
50-150 2.374e-08 2.006e-08
15-150 5.134e-08 3.364e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.38594 (-2.16961 2.82973)
R1^2/D10^2 : 2.03595 (-1.59043 8.8107)
kT2 [keV] : 45.5596 (-29.1486 -45.5593)
R2^2/D10^2 : 1.35136E-03 (-0.00131813 0.024655)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.233e-08 7.320e-09
25- 50 1.599e-08 9.305e-09
50-150 2.742e-08 1.590e-08
15-150 5.574e-08 2.836e-08
Plot creation:
Wed Apr 2 22:12:49 EDT 2025