batgrbproduct analysis for trigger=1299776
batgrbproduct Analysis for Trigger=1299776
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 21:58:14 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1299776/batgroup_hand_proc
======================================================================
Trigger: 01299776 Segment: 000
BAT Trigger Time: 765007693.504 [s; MET]
Trigger Stop: 765007693.76 [s; MET]
UTC: 2025-03-30T06:07:38.168640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.789866205979 Dec: -86.8701560437198 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.82
Image Trigger?: NO
Rate S/N Ratio: 22.5388553391693 [ if not an image trigger ]
Image S/N Ratio: 10.82
Flight Position: [ source = BAT ]
RA: 252.789866205979 Dec: -86.8701560437198 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.685450218347 Dec: -86.874890859077 [deg; J2000]
{ 16h 50m 44.5s , -86d 52' 29.6" }
+/- 1.04313044215739 [arcmin] (estimated 90% radius based on SNR)
+/- 0.330605330035817 [arcmin] (formal 1-sigma fit error)
SNR: 28.6365273642357
Angular difference between Flight and Ground position is 0.444449 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 11.271999835968 +/- 2.5328087158702
Measured from: 0.140000104904175
to: 11.4119999408722 [s; relative to TRIGTIME]
T50: 2.75199997425079 +/- 0.3835205745624
Measured from: 0.820000052452087
to: 3.57200002670288 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.260000109672546
to: 1.26000010967255 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.163999915122986
to: 14.3320000171661 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.488694 0.632021 0.383085 0.072914
0.027239 0.028149 0.023992 0.020726 [error]
Peak 0.141060 0.190682 0.128087 0.031739
0.008958 0.009772 0.008484 0.006405 [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 2.50e-07 3.04e-07 7.27e-07 9.18e-07 1.44e-06 erg/cm2
Error 1.34e-08 1.35e-08 2.36e-08 1.18e-07 5.55e-08 1.38e-07 erg/cm2
Peak flux Power-law 1.41e+00 1.34e+00 8.91e-01 9.19e-01 4.02e+00 4.56e+00 ph/cm2/s
Error 1.35e-01 8.15e-02 6.94e-02 1.43e-01 2.38e-01 2.69e-01 ph/cm2/s
Fluence Cutoff-PL 1.46e-07 2.63e-07 3.07e-07 3.47e-07 8.78e-07 1.06e-06 erg/cm2
Error 1.55e-08 1.72e-08 2.54e-08 2.08e-07 6.37e-08 2.16e-07 erg/cm2
Peak flux Cutoff-PL 1.31e+00 1.42e+00 9.17e-01 5.06e-01 3.94e+00 4.15e+00 ph/cm2/s
Error 1.56e-01 1.02e-01 7.63e-02 2.45e-01 2.46e-01 3.43e-01 ph/cm2/s
Fluence Band 1.42e-07 2.66e-07 2.95e-07 6.17e-07 8.92e-07 1.32e-06 erg/cm2
Error 1.65e-08 1.76e-08 2.49e-08 -------- 5.75e-08 -------- 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 1.717 0.096 - - 6.85e-03 3.94e-04 65.900 57
CPL 1.243 0.399 74.2 57.6 1.22e-02 6.25e-03 61.230 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.593 0.100 - - 3.14e-02 1.92e-03 64.510 57
CPL 1.092 0.420 85.7 76.6 5.78e-02 3.12e-02 59.750 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: 11.648000 sec.
T50 in the 50-300 keV band: 2.688000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 14.496 -0.164 14.332
T90 11.272 0.140 11.412
T50 2.752 0.820 3.572
Peak 1.000 0.260 1.260
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.6855 -86.8749 0.0067 17.2 3.6 1.5468 28.6 TRIG_01299776
------------------------------------------
Foreground time interval of the image:
-0.164 11.197 (delta_t = 11.361 [sec])
Background time interval of the image:
-179.504 -0.164 (delta_t = 179.340 [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 -0.164 sec. to 14.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71727 ( -0.0956383 0.0968023 )
Norm@50keV : 6.84509E-03 ( -0.000394999 0.000392444 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.90 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.962476e-01
Photon flux (15-150 keV) in 14.5 sec: 0.914659 ( -0.0496794 0.0497311 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17783e-07 ( -5.53192e-08 5.57038e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.164 sec. to 14.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24338 ( -0.418129 0.379223 )
Epeak [keV] : 74.1508 ( -16.3614 98.8459 )
Norm@50keV : 1.22473E-02 ( -0.00446368 0.00803196 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 56 degrees of freedom
# Null hypothesis probability = 2.939255e-01
Photon flux (15-150 keV) in 14.5 sec: 0.893223 ( -0.052426 0.052395 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.77936e-07 ( -6.34549e-08 6.38667e-08 ) ergs/cm2
Band function
Time interval is from -0.164 sec. to 14.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24338 ( -0.328164 0.410868 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 74.1369 ( -14.0907 99.3364 )
Norm@50keV : 1.22459E-02 ( -0.00446394 0.00804202 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.624681e-01
Photon flux (15-150 keV) in 14.5 sec: 0.895582 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.92343e-07 ( -8.92242e-07 -5.72982e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.5306 ( )
R^2/D10^2 : 0.186581 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 130.82 using 59 PHA bins.
# Reduced chi-squared = 2.2951 for 57 degrees of freedom
# Null hypothesis probability = 9.852022e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.007e-08 9.207e-09
25- 50 2.979e-07 1.943e-08
50-150 2.892e-07 3.538e-08
15-150 6.772e-07 4.205e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 123.496 (-26.1459 35.3705)
Norm : 3.85877 (-0.259163 0.306847)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.456e-07 1.280e-08
25- 50 2.617e-07 1.957e-08
50-150 4.736e-07 1.405e-07
15-150 8.808e-07 1.502e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48883 (-1.07079 1.24408)
R1^2/D10^2 : 1.34901 (-0.59028 1.18782)
kT2 [keV] : 22.2715 (-3.62495 6.02092)
R2^2/D10^2 : 1.70900E-02 (-0.0102048 0.0174766)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.441e-07 2.381e-08
25- 50 2.634e-07 4.539e-08
50-150 4.644e-07 1.127e-07
15-150 8.719e-07 1.712e-07
Peak spectrum fit
Power-law model
Time interval is from 0.260 sec. to 1.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59309 ( -0.0995177 0.100489 )
Norm@50keV : 3.13509E-02 ( -0.00192915 0.00191941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.51 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.308430e-01
Photon flux (15-150 keV) in 1 sec: 4.02017 ( -0.237642 0.237795 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93448e-07 ( -1.94229e-08 1.95465e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.260 sec. to 1.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09181 ( -0.44226 0.397948 )
Epeak [keV] : 85.7147 ( -21.0238 132.177 )
Norm@50keV : 5.78377E-02 ( -0.0218246 0.0405305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.409479e-01
Photon flux (15-150 keV) in 1 sec: 3.94222 ( -0.24565 0.24548 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81302e-07 ( -2.1452e-08 2.1834e-08 ) ergs/cm2
Band function
Time interval is from 0.260 sec. to 1.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.76225 ( -5.48172 -4.76225 )
beta : -1.74436 ( -0.129942 0.123764 )
Epeak [keV] : 26.5094 ( -2.91181 2.73818 )
Norm@50keV : 1721.12 ( -99.4364 4627.73 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.722271e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86114e-07 ( -2.86107e-07 -1.9939e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2081 ( )
R^2/D10^2 : 0.706424 ( )
(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 2.613e-08 3.085e-09
25- 50 9.153e-08 6.165e-09
50-150 1.019e-07 1.347e-08
15-150 2.196e-07 1.580e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 167.915 (-42.3096 -167.916)
Norm : 16.5572 (-1.05402 1.14923)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.207e-08 3.450e-09
25- 50 7.922e-08 1.124e-08
50-150 1.635e-07 5.798e-08
15-150 2.848e-07 7.580e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.77645 (-1.38957 1.46698)
R1^2/D10^2 : 3.23267 (-1.31024 2.71767)
kT2 [keV] : 27.7903 (-6.3011 12.8955)
R2^2/D10^2 : 3.51075E-02 (-0.0251854 0.0576158)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.903e-08 8.085e-09
25- 50 8.410e-08 1.403e-08
50-150 1.622e-07 7.204e-08
15-150 2.853e-07 8.325e-08
Plot creation:
Wed Apr 2 22:05:33 EDT 2025