batgrbproduct analysis for trigger=1285812
batgrbproduct Analysis for Trigger=1285812
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 30 07:57:24 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1285812/GCN5_download_cron
======================================================================
Trigger: 01285812 Segment: 000
BAT Trigger Time: 759818744 [s; MET]
Trigger Stop: 759818808 [s; MET]
UTC: 2025-01-29T04:45:09.019520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 198.689488755722 Dec: 5.03870168426934 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.13
Flight Position: [ source = BAT ]
RA: 198.689488755722 Dec: 5.03870168426934 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 198.707529107072 Dec: 5.02912665155355 [deg; J2000]
{ 13h 14m 49.8s , +05d 01' 44.9" }
+/- 1.80008019031135 [arcmin] (estimated 90% radius based on SNR)
+/- 0.776173614230653 [arcmin] (formal 1-sigma fit error)
SNR: 13.1345661910061
Angular difference between Flight and Ground position is 1.221748 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 262.24799990654 +/- 23.714333365497
Measured from: -32.6679998636246
to: 229.580000042915 [s; relative to TRIGTIME]
T50: 133.795999884605 +/- 9.02923694479337
Measured from: 62.256000161171
to: 196.052000045776 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 184.120000004768
to: 185.120000004768 [s; relative to TRIGTIME]
Total Fluence
Measured from: -64.3919999599457
to: 302.62399995327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.841602 3.804326 1.721873 0.239513
0.119259 0.122338 0.102341 0.086161 [error]
Peak 0.051893 0.074822 0.036953 0.002016
0.006752 0.006990 0.005897 0.004599 [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 1.29e-06 1.57e-06 1.39e-06 2.13e-06 4.99e-06 6.38e-06 erg/cm2
Error 8.81e-08 6.62e-08 1.02e-07 3.20e-07 2.29e-07 4.16e-07 erg/cm2
Peak flux Power-law 5.82e-01 4.79e-01 2.67e-01 2.20e-01 1.43e+00 1.55e+00 ph/cm2/s
Error 9.69e-02 5.61e-02 4.63e-02 7.13e-02 1.67e-01 1.83e-01 ph/cm2/s
Fluence Cutoff-PL 1.25e-06 1.60e-06 1.39e-06 1.47e-06 4.89e-06 5.71e-06 erg/cm2
Error 1.04e-07 6.23e-08 1.07e-07 7.26e-07 2.84e-07 8.15e-07 erg/cm2
Peak flux Cutoff-PL 5.07e-01 5.63e-01 2.68e-01 4.88e-02 1.38e+00 1.39e+00 ph/cm2/s
Error 1.11e-01 8.16e-02 5.92e-02 6.51e-02 1.70e-01 1.77e-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 2.174 0.088 - - 1.45e-03 7.49e-05 55.940 57
CPL 1.973 0.204 5.9 16.2 1.87e-03 6.63e-04 54.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.841 0.194 - - 1.02e-02 1.38e-03 48.350 57
CPL 0.453 1.092 47.5 13.0 6.32e-02 1.69e-01 41.240 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: 254.912000 sec.
T50 in the 50-300 keV band: 174.912000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 367.016 -64.392 302.624
T90 262.248 -32.668 229.580
T50 133.796 62.256 196.052
Peak 1.000 184.120 185.120
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
198.7075 +5.0291 0.0146 27.3 1.2 2.5889 13.1 TRIG_01285812
------------------------------------------
Foreground time interval of the image:
-64.392 73.801 (delta_t = 138.193 [sec])
Background time interval of the image:
-239.000 -64.392 (delta_t = 174.608 [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 -64.392 sec. to 302.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17355 ( -0.087168 0.0889949 )
Norm@50keV : 1.45242E-03 ( -7.52388e-05 7.4482e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.94 using 59 PHA bins.
# Reduced chi-squared = 0.9813 for 57 degrees of freedom
# Null hypothesis probability = 5.150120e-01
Photon flux (15-150 keV) in 367 sec: 0.237159 ( -0.0106462 0.0106815 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.99381e-06 ( -2.28729e-07 2.2993e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -64.392 sec. to 302.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97298 ( -0.381244 0.0259581 )
Epeak [keV] : 5.86864 ( -4.96325 27.4304 )
Norm@50keV : 1.87371E-03 ( -0.000181807 0.00114418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.79 using 59 PHA bins.
# Reduced chi-squared = 0.9784 for 56 degrees of freedom
# Null hypothesis probability = 5.208036e-01
Photon flux (15-150 keV) in 367 sec: 0.233715 ( -0.011849 0.011877 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8858e-06 ( -2.84572e-07 2.83324e-07 ) ergs/cm2
Band function
Time interval is from -64.392 sec. to 302.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16305 ( -1.17898 4.82854 )
beta : -2.29887 ( 2.29953 0.148092 )
Epeak [keV] : 26.9734 ( -10.1189 5.92409 )
Norm@50keV : 6.50276E-03 ( -0.00422409 57.2909 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.31 using 59 PHA bins.
# Reduced chi-squared = 0.9511 for 55 degrees of freedom
# Null hypothesis probability = 5.779708e-01
Photon flux (15-150 keV) in 367 sec: 0.230537 ( ) 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] : 9.63029 ( )
R^2/D10^2 : 0.116529 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 172.79 using 59 PHA bins.
# Reduced chi-squared = 3.0314 for 57 degrees of freedom
# Null hypothesis probability = 1.371421e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.966e-07 6.129e-08
25- 50 1.876e-06 8.056e-08
50-150 8.770e-07 1.066e-07
15-150 3.549e-06 1.686e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.5384 (-6.77817 8.052)
Norm : 1.24319 (-0.103514 0.101995)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.131e-06 8.257e-08
25- 50 1.680e-06 8.184e-08
50-150 1.789e-06 1.793e-07
15-150 4.600e-06 2.257e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.32170 (-0.691409 0.693003)
R1^2/D10^2 : 0.491457 (-0.156763 0.270136)
kT2 [keV] : 22.6154 (-3.82735 5.61415)
R2^2/D10^2 : 2.71145E-03 (-0.00152213 0.00299836)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.122e-06 1.380e-07
25- 50 1.646e-06 1.679e-07
50-150 2.039e-06 5.298e-07
15-150 4.807e-06 8.489e-07
Peak spectrum fit
Power-law model
Time interval is from 184.120 sec. to 185.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84099 ( -0.189478 0.198487 )
Norm@50keV : 1.01835E-02 ( -0.00138848 0.00136546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.35 using 59 PHA bins.
# Reduced chi-squared = 0.8482 for 57 degrees of freedom
# Null hypothesis probability = 7.858580e-01
Photon flux (15-150 keV) in 1 sec: 1.42618 ( -0.167401 0.167444 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.36524e-08 ( -1.27012e-08 1.29046e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 184.120 sec. to 185.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.452577 ( -1.24854 0.936015 )
Epeak [keV] : 47.4684 ( -8.40554 17.6927 )
Norm@50keV : 6.31942E-02 ( -0.0631969 0.274435 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.24 using 59 PHA bins.
# Reduced chi-squared = 0.7364 for 56 degrees of freedom
# Null hypothesis probability = 9.300249e-01
Photon flux (15-150 keV) in 1 sec: 1.37928 ( -0.1701 0.1703 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.42683e-08 ( -1.32427e-08 1.40613e-08 ) ergs/cm2
Band function
Time interval is from 184.120 sec. to 185.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.101045 ( -0.870861 1.06337 )
beta : -2.64031 ( 9.37167 19.3717 )
Epeak [keV] : 41.9727 ( -10.2814 17.1509 )
Norm@50keV : 0.147410 ( -0.151198 233.148 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.60 using 59 PHA bins.
# Reduced chi-squared = 0.7382 for 55 degrees of freedom
# Null hypothesis probability = 9.265046e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.6613e-08 ( -8.6606e-08 -1.36734e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8858 (-1.2748 1.46468)
R^2/D10^2 : 0.518061 (-0.196725 0.307828)
(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 1.280e-08 2.626e-09
25- 50 3.571e-08 5.640e-09
50-150 2.371e-08 6.110e-09
15-150 7.222e-08 1.177e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 84.0408 (-25.1456 45.9874)
Norm : 6.72655 (-1.04632 1.25291)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.750e-08 2.685e-09
25- 50 2.915e-08 4.035e-09
50-150 4.251e-08 2.033e-08
15-150 8.917e-08 2.115e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.98497 (-3.61581 2.45884)
R1^2/D10^2 : 1.18346 (-0.641422 1.05371)
kT2 [keV] : 21.9164 (-13.7543 77.3173)
R2^2/D10^2 : 1.92480E-02 (-0.0189655 0.236146)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.534e-08 7.847e-09
25- 50 3.281e-08 1.690e-08
50-150 3.865e-08 2.153e-08
15-150 8.681e-08 4.396e-08
Plot creation:
Thu Jan 30 08:01:24 EST 2025