batgrbproduct analysis for trigger=1287821
batgrbproduct Analysis for Trigger=1287821
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 Feb 8 02:41:25 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1287821/GCN5_download_cron
======================================================================
Trigger: 01287821 Segment: 000
BAT Trigger Time: 760583802.368 [s; MET]
Trigger Stop: 760583803.392 [s; MET]
UTC: 2025-02-07T01:16:07.335260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.1147840004549 Dec: -12.1587242122474 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.23
Image Trigger?: NO
Rate S/N Ratio: 34.5253530032641 [ if not an image trigger ]
Image S/N Ratio: 14.23
Flight Position: [ source = BAT ]
RA: 16.1147840004549 Dec: -12.1587242122474 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 16.0974038368835 Dec: -12.1652706063634 [deg; J2000]
{ 01h 04m 23.4s , -12d 09' 55.0" }
+/- 0.768556572388558 [arcmin] (estimated 90% radius based on SNR)
+/- 0.217216211215097 [arcmin] (formal 1-sigma fit error)
SNR: 44.3035581777978
Angular difference between Flight and Ground position is 1.092458 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 52.5439999103546 +/- 19.8734170560793
Measured from: -3.5919998884201
to: 48.9520000219345 [s; relative to TRIGTIME]
T50: 10.6239998340607 +/- 1.14486683220214
Measured from: 1.40000009536743
to: 12.0239999294281 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.01199996471405
to: 8.01199996471405 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.60000002384186
to: 100.215999960899 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.278448 1.732045 1.819056 0.587520
0.069294 0.073407 0.064715 0.055105 [error]
Peak 0.059351 0.118606 0.120424 0.032436
0.009030 0.010121 0.009384 0.007248 [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 3.76e-07 7.99e-07 1.33e-06 5.03e-06 3.66e-06 7.54e-06 erg/cm2
Error 3.30e-08 4.05e-08 6.30e-08 5.62e-07 1.59e-07 5.89e-07 erg/cm2
Peak flux Power-law 6.70e-01 8.24e-01 7.36e-01 1.14e+00 2.62e+00 3.37e+00 ph/cm2/s
Error 1.12e-01 8.69e-02 7.13e-02 2.24e-01 2.41e-01 3.09e-01 ph/cm2/s
Fluence Cutoff-PL 3.77e-07 8.00e-07 1.33e-06 4.98e-06 3.66e-06 7.48e-06 erg/cm2
Error 3.43e-08 4.03e-08 6.30e-08 7.34e-07 1.58e-07 7.36e-07 erg/cm2
Peak flux Cutoff-PL 5.39e-01 8.86e-01 8.19e-01 4.89e-01 2.55e+00 2.73e+00 ph/cm2/s
Error 1.36e-01 1.03e-01 9.14e-02 2.72e-01 2.47e-01 3.60e-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 1.265 0.077 - - 3.44e-03 1.42e-04 52.840 57
CPL 1.263 0.078 9999.4 0.0 3.45e-03 4.52e-04 52.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.164 0.142 - - 2.25e-02 1.99e-03 58.640 57
CPL 0.193 0.708 101.6 57.1 6.42e-02 5.51e-02 51.610 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: 20.864000 sec.
T50 in the 50-300 keV band: 8.832000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 106.816 -6.600 100.216
T90 52.544 -3.592 48.952
T50 10.624 1.400 12.024
Peak 1.000 7.012 8.012
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
16.0974 -12.1653 0.0043 35.4 -171.2 3.6828 44.3 TRIG_01287821
------------------------------------------
Foreground time interval of the image:
-6.600 9.233 (delta_t = 15.833 [sec])
Background time interval of the image:
-239.368 -234.738 (delta_t = 4.630 [sec])
-229.368 -228.188 (delta_t = 1.180 [sec])
-215.368 -209.468 (delta_t = 5.900 [sec])
-208.368 -196.888 (delta_t = 11.480 [sec])
-185.368 -184.008 (delta_t = 1.360 [sec])
-117.368 -117.268 (delta_t = 0.100 [sec])
-60.368 -6.600 (delta_t = 53.768 [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 -6.600 sec. to 100.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26527 ( -0.0775959 0.077062 )
Norm@50keV : 3.43839E-03 ( -0.000142319 0.000142128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.84 using 59 PHA bins.
# Reduced chi-squared = 0.9270 for 57 degrees of freedom
# Null hypothesis probability = 6.319206e-01
Photon flux (15-150 keV) in 106.8 sec: 0.407699 ( -0.0182663 0.0183777 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66053e-06 ( -1.59002e-07 1.59511e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.600 sec. to 100.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26335 ( -0.0799121 0.0757751 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.45174E-03 ( -0.000141696 0.000761334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.87 using 59 PHA bins.
# Reduced chi-squared = 0.9441 for 56 degrees of freedom
# Null hypothesis probability = 5.940592e-01
Photon flux (15-150 keV) in 106.8 sec: 0.407994 ( -0.018788 0.017926 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65934e-06 ( -1.57434e-07 1.59442e-07 ) ergs/cm2
Band function
Time interval is from -6.600 sec. to 100.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.958978 ( 0.961813 0.961813 )
beta : -1.26545 ( -0.0792594 0.0777333 )
Epeak [keV] : 58.2301 ( -57.9639 -57.9639 )
Norm@50keV : 6.48581E-03 ( -0.00234421 228413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.83 using 59 PHA bins.
# Reduced chi-squared = 0.9606 for 55 degrees of freedom
# Null hypothesis probability = 5.577983e-01
Photon flux (15-150 keV) in 106.8 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] : 20.5539 ( )
R^2/D10^2 : 1.63996E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 192.11 using 59 PHA bins.
# Reduced chi-squared = 3.3703 for 57 degrees of freedom
# Null hypothesis probability = 1.545390e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.411e-07 1.244e-08
25- 50 7.153e-07 4.640e-08
50-150 2.248e-06 1.474e-07
15-150 3.104e-06 1.410e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-6.47452 -200)
Norm : 1.73040 (-0.0721167 0.0721167)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.604e-07 2.083e-08
25- 50 8.856e-07 3.882e-08
50-150 1.942e-06 8.971e-08
15-150 3.288e-06 1.533e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.16169 (-0.876285 1.05703)
R1^2/D10^2 : 0.599734 (-0.268047 0.510552)
kT2 [keV] : 29.5674 (-2.92316 3.93045)
R2^2/D10^2 : 4.43863E-03 (-0.0014805 0.00184092)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.008e-07 7.898e-08
25- 50 7.553e-07 8.838e-08
50-150 2.527e-06 2.387e-07
15-150 3.683e-06 2.932e-07
Peak spectrum fit
Power-law model
Time interval is from 7.012 sec. to 8.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16367 ( -0.143627 0.141015 )
Norm@50keV : 2.24631E-02 ( -0.00198662 0.00198537 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.64 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.151172e-01
Photon flux (15-150 keV) in 1 sec: 2.62403 ( -0.240328 0.240841 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30302e-07 ( -2.16997e-08 2.17752e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.012 sec. to 8.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.193089 ( -0.769739 0.64673 )
Epeak [keV] : 101.553 ( -23.4736 90.6975 )
Norm@50keV : 6.41823E-02 ( -0.03174 0.0785107 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.61 using 59 PHA bins.
# Reduced chi-squared = 0.9215 for 56 degrees of freedom
# Null hypothesis probability = 6.417454e-01
Photon flux (15-150 keV) in 1 sec: 2.54662 ( -0.24716 0.2471 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20281e-07 ( -2.3501e-08 2.3341e-08 ) ergs/cm2
Band function
Time interval is from 7.012 sec. to 8.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.219964 ( -0.922646 4.33108 )
beta : -1.74489 ( 1.73073 0.473384 )
Epeak [keV] : 79.6392 ( -39.2573 72.9401 )
Norm@50keV : 0.109390 ( -0.122172 79.7752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.42 using 59 PHA bins.
# Reduced chi-squared = 0.9167 for 55 degrees of freedom
# Null hypothesis probability = 6.500617e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20697e-07 ( -2.2069e-07 -2.2816e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.8068 (-1.85044 2.13944)
R^2/D10^2 : 0.155562 (-0.0474684 0.0651257)
(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 1.086e-08 1.813e-09
25- 50 5.183e-08 6.270e-09
50-150 1.344e-07 1.930e-08
15-150 1.971e-07 2.300e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-18.9032 -200)
Norm : 10.9739 (-0.990991 0.990991)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.733e-08 5.320e-09
25- 50 5.258e-08 1.590e-08
50-150 1.153e-07 5.181e-08
15-150 1.952e-07 6.145e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.5298 (-5.23883 4.52115)
R1^2/D10^2 : 0.403710 (-0.220661 1.10018)
kT2 [keV] : 42.5125 (-34.4167 -41.381)
R2^2/D10^2 : 6.83117E-03 (-0.00639892 0.0461872)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.515e-08 7.543e-09
25- 50 5.489e-08 2.426e-08
50-150 1.523e-07 7.587e-08
15-150 2.223e-07 1.006e-07
Plot creation:
Sat Feb 8 02:45:00 EST 2025