batgrbproduct analysis for trigger=1058804
batgrbproduct Analysis for Trigger=1058804
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
Sepcial note:
Due to the low partial coding fraction of this burst, the light curves and burst durations are created using the special DETECTION mask aperture. However, the spectral analysis are done using the default FLUX aperture for more accurate results, and thus the spectral analysis is only available after T+18.008 s (met=646945679 s; see figure below), when the burst came into the BAT calibrated field of view.
FLUX-mask-weighted light curve (pcodethresh=0.05; aperture=CALDB:FLUX)
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Sun Jul 4 10:38:29 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1058804/batgroup_hand_proc
======================================================================
Trigger: 01058804 Segment: 000
BAT Trigger Time: 646945660.992 [s; MET]
Trigger Stop: 646945662.016 [s; MET]
UTC: 2021-07-02T19:07:13.691440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 168.569805415435 Dec: -36.741422872714 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.99
Image Trigger?: NO
Rate S/N Ratio: 95.0683964312011 [ if not an image trigger ]
Image S/N Ratio: 6.99
Flight Position: [ source = BAT ]
RA: 168.569805415435 Dec: -36.741422872714 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 168.56985 Dec: -36.74145 [deg; J2000]
{ 11h 14m 16.8s , -36d -44' -29.2" }
+/- 1.49928384125 [arcmin] (estimated 90% radius based on SNR)
SNR: 17.05738845865164
Angular difference between Flight and Ground position is 0.002692 arcmin
Partial Coding Fraction: 0.04199219 [ including projection effects ]
Duration
T90: 138.151999950409 +/- 47.5996473174201
Measured from: -2.46399998664856
to: 135.68799996376 [s; relative to TRIGTIME]
T50: 31.9759999513626 +/- 4.78609198481258
Measured from: 1.06400001049042
to: 33.039999961853 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.644000053405762
to: 1.64400005340576 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.64800000190735
to: 369.215999960899 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.749349 12.390532 13.424999 5.693927
0.321195 0.374209 0.389027 0.381329 [error]
Peak 0.246264 0.806592 0.828630 0.678501
0.068491 0.085345 0.090169 0.088273 [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 1.38e-06 2.47e-06 3.41e-06 9.80e-06 9.83e-06 1.71e-05 erg/cm2
Error 1.19e-07 1.24e-07 2.18e-07 1.39e-06 5.16e-07 1.54e-06 erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 1.35e-06 2.49e-06 3.44e-06 8.32e-06 9.76e-06 1.56e-05 erg/cm2
Error 1.28e-07 1.39e-07 2.31e-07 2.48e-06 5.68e-07 2.58e-06 erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- 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 1.535 0.089 - - 2.97e-03 1.42e-04 54.030 57
CPL 1.425 0.270 273.5 0.0 3.35e-03 1.03e-03 53.720 56
(1-s peak spectrum is not available)
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: 129.856000 sec.
T50 in the 50-300 keV band: 21.696000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 372.864 -3.648 369.216
T90 138.152 -2.464 135.688
T50 31.976 1.064 33.040
Peak 1.000 0.644 1.644
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
168.56985 -36.74145 0.0 60.2836 -157.8916 23.3804 17.0574 TRIG_01058804
Foreground time interval of the image:
-3.648 10.0 (delta_t = 13.648 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from 18.008 sec. to 369.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53519 ( -0.0890221 0.0897133 )
Norm@50keV : 2.96744E-03 ( -0.000142394 0.000141769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.03 using 59 bins.
Reduced chi-squared = 0.947895
# Null hypothesis probability of 5.87e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 351.2 sec: 0.374081 ( -0.018197 0.018252 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.83364e-06 ( -5.1474e-07 5.17655e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.008 sec. to 369.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42549 ( -0.35104 0.188457 )
Epeak [keV] : 273.521 ( -273.485 -273.485 )
Norm@50keV : 3.35186E-03 ( -0.000510312 0.00154251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.72 using 59 bins.
Reduced chi-squared = 0.959286
# Null hypothesis probability of 5.62e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 351.2 sec: 0.371376 ( -0.019858 0.019271 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.74977e-06 ( -5.73745e-07 5.62507e-07 ) ergs/cm2
Band function
Time interval is from 18.008 sec. to 369.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42562 ( 1.28972 1.28972 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 273.727 ( -124.574 -273.727 )
Norm@50keV : 3.35087E-03 ( -0.000223972 0.00154363 )
------------------------------------------------------------
Photon flux (15-150 keV) in 351.2 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] : 15.8431 ( )
R^2/D10^2 : 3.37337E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 157.96 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.02e-11 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.162e-07 6.006e-08
25- 50 2.571e-06 1.542e-07
50-150 4.494e-06 4.302e-07
15-150 7.681e-06 4.741e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-32.0633 -200)
Norm : 1.51718 (-0.0706744 0.0706744)
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.34 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.37e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.327e-06 6.866e-08
25- 50 2.553e-06 1.322e-07
50-150 5.599e-06 3.881e-07
15-150 9.480e-06 4.934e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29241 (-0.906626 1.10676)
R1^2/D10^2 : 1.06530 (-0.560559 1.33652)
kT2 [keV] : 22.7269 (-2.42063 3.30121)
R2^2/D10^2 : 8.32276E-03 (-0.00324462 0.00426393)
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.90 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.55e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.411e-06 3.061e-07
25- 50 2.334e-06 2.560e-07
50-150 5.768e-06 7.200e-07
15-150 9.514e-06 1.194e-06
Plot creation:
Sun Jul 4 13:34:22 EDT 2021