batgrbproduct analysis for trigger=1280056
batgrbproduct Analysis for Trigger=1280056
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 9 01:19:21 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1280056/GCN5_download_cron
======================================================================
Trigger: 01280056 Segment: 000
BAT Trigger Time: 758024621.056 [s; MET]
Trigger Stop: 758024625.152 [s; MET]
UTC: 2025-01-08T10:23:06.198080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 201.297419885604 Dec: 25.6127383632345 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.13
Image Trigger?: NO
Rate S/N Ratio: 10.8627804912002 [ if not an image trigger ]
Image S/N Ratio: 8.13
Flight Position: [ source = BAT ]
RA: 201.297419885604 Dec: 25.6127383632345 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 201.311827701108 Dec: 25.6220572794087 [deg; J2000]
{ 13h 25m 14.8s , +25d 37' 19.4" }
+/- 1.82710813280331 [arcmin] (estimated 90% radius based on SNR)
+/- 0.701534054987272 [arcmin] (formal 1-sigma fit error)
SNR: 12.8578824305502
Angular difference between Flight and Ground position is 0.959292 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 229.664000034332 +/- 43.3011024684956
Measured from: -53.6959998607635
to: 175.968000173569 [s; relative to TRIGTIME]
T50: 52.2080000638962 +/- 30.7061635397146
Measured from: -2.83199989795685
to: 49.3760001659393 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.55599999427795
to: 2.55599999427795 [s; relative to TRIGTIME]
Total Fluence
Measured from: -63.1360000371933
to: 218.208000063896 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.953676 0.995873 0.753537 0.195432
0.097155 0.100419 0.085349 0.070944 [error]
Peak 0.015567 0.026948 0.026083 0.010966
0.006082 0.006492 0.005968 0.004575 [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 2.65e-07 4.48e-07 5.77e-07 1.50e-06 1.70e-06 2.79e-06 erg/cm2
Error 4.51e-08 4.64e-08 8.65e-08 4.80e-07 2.02e-07 5.51e-07 erg/cm2
Peak flux Power-law 1.23e-01 1.74e-01 1.84e-01 3.57e-01 5.93e-01 8.38e-01 ph/cm2/s
Error 7.02e-02 5.98e-02 4.53e-02 2.15e-01 1.51e-01 2.21e-01 ph/cm2/s
Fluence Cutoff-PL 2.66e-07 4.48e-07 5.73e-07 1.48e-06 1.69e-06 2.67e-06 erg/cm2
Error 4.51e-08 4.64e-08 8.64e-08 4.49e-07 2.02e-07 6.96e-07 erg/cm2
Peak flux Cutoff-PL 1.28e-01 1.78e-01 1.83e-01 3.43e-01 5.97e-01 8.28e-01 ph/cm2/s
Error 7.03e-02 5.99e-02 4.60e-02 2.44e-01 1.51e-01 5.34e-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 1.635 0.191 - - 6.49e-04 7.13e-05 59.650 57
CPL 1.635 0.244 9999.3 -0.0 6.50e-04 0.00e+00 59.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.925 0.483 - - 5.17e-03 1.32e-03 58.430 57
CPL 0.930 0.585 9999.4 0.0 5.21e-03 4.77e-03 58.440 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: 107.712000 sec.
T50 in the 50-300 keV band: 30.656000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 281.344 -63.136 218.208
T90 229.664 -53.696 175.968
T50 52.208 -2.832 49.376
Peak 1.000 1.556 2.556
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
201.3118 +25.6221 0.0150 25.3 -151.9 1.8331 12.9 TRIG_01280056
------------------------------------------
Foreground time interval of the image:
-63.136 32.545 (delta_t = 95.681 [sec])
Background time interval of the image:
-239.056 -63.136 (delta_t = 175.920 [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 -63.136 sec. to 218.208 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63479 ( -0.189272 0.193375 )
Norm@50keV : 6.49435E-04 ( -7.18875e-05 7.07341e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.793752e-01
Photon flux (15-150 keV) in 281.3 sec: 8.43799E-02 ( -0.0087019 0.00871735 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70172e-06 ( -2.01064e-07 2.03463e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -63.136 sec. to 218.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63512 ( -0.29493 0.192641 )
Epeak [keV] : 9999.29 ( -9999.34 -9999.35 )
Norm@50keV : 6.50494E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.66 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.440001e-01
Photon flux (15-150 keV) in 281.3 sec: 8.44964E-02 ( -0.0088557 0.0085985 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69008e-06 ( -1.90302e-07 2.13372e-07 ) ergs/cm2
Band function
Time interval is from -63.136 sec. to 218.208 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29862 ( 1.29829 1.29829 )
beta : -1.63482 ( 1.63482 0.189324 )
Epeak [keV] : 27.9869 ( -28.2016 -28.2016 )
Norm@50keV : 1.41461E-03 ( -0.00082996 0.096468 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 55 degrees of freedom
# Null hypothesis probability = 3.102834e-01
Photon flux (15-150 keV) in 281.3 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] : 13.5646 (-2.14532 2.63696)
R^2/D10^2 : 1.27165E-02 (-0.005854 0.0108694)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.76 using 59 PHA bins.
# Reduced chi-squared = 1.750 for 57 degrees of freedom
# Null hypothesis probability = 3.978687e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.394e-07 3.263e-08
25- 50 5.020e-07 7.778e-08
50-150 5.982e-07 1.439e-07
15-150 1.240e-06 1.747e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.057 (-71.9734 -175.845)
Norm : 0.342179 (-0.0369853 0.0444307)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.405e-07 1.342e-07
25- 50 4.583e-07 2.395e-07
50-150 9.790e-07 5.332e-07
15-150 1.678e-06 8.907e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.77470 (-1.32484 1.58626)
R1^2/D10^2 : 0.212672 (-0.127092 0.402014)
kT2 [keV] : 27.5641 (-6.54431 12.9268)
R2^2/D10^2 : 8.92056E-04 (-0.000623584 0.000804567)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.818e-07 1.399e-07
25- 50 4.160e-07 1.321e-07
50-150 1.048e-06 5.448e-07
15-150 1.746e-06 6.182e-07
Peak spectrum fit
Power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.924614 ( -0.517607 0.447679 )
Norm@50keV : 5.16509E-03 ( -0.00135235 0.00127945 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.43 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.227531e-01
Photon flux (15-150 keV) in 1 sec: 0.593029 ( -0.150436 0.151334 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.7422e-08 ( -1.43211e-08 1.43917e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.929792 ( -0.729632 0.440582 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.20860E-03 ( -0.00122248 0.00832744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 56 degrees of freedom
# Null hypothesis probability = 3.858127e-01
Photon flux (15-150 keV) in 1 sec: 0.596914 ( -0.154797 0.147571 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.73505e-08 ( -1.42475e-08 1.41359e-08 ) ergs/cm2
Band function
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.935767 ( -0.463197 0.522502 )
Epeak [keV] : 20.9344 ( -20.9398 -20.9398 )
Norm@50keV : 917.242 ( -298.063 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.529284e-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] : 28.4280 (-9.88795 23.0157)
R^2/D10^2 : 9.50728E-03 (-0.00942765 0.0257864)
(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 1.242e-09 7.765e-10
25- 50 7.487e-09 4.486e-09
50-150 4.356e-08 2.639e-08
15-150 5.229e-08 2.917e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-72.4373 -200)
Norm : 2.47194 (-0.619327 0.619327)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.155e-09 3.668e-09
25- 50 1.184e-08 7.045e-09
50-150 2.597e-08 1.545e-08
15-150 4.396e-08 2.660e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.12027 (-3.96784 7.09246)
R1^2/D10^2 : 0.349553 (-0.292367 1.16022)
kT2 [keV] : 64.4590 (-43.5746 -68.3711)
R2^2/D10^2 : 1.01611E-03 (-0.000718164 0.0101583)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.589e-09 2.995e-09
25- 50 1.042e-08 5.695e-09
50-150 4.542e-08 2.460e-08
15-150 6.043e-08 3.114e-08
Plot creation:
Thu Jan 9 01:22:40 EST 2025