batgrbproduct analysis for trigger=1015088
batgrbproduct Analysis for Trigger=1015088
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): Tue Dec 29 16:46:27 EST 2020
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1015088/batgroup_hand_proc
======================================================================
Trigger: 01015088 Segment: 000
BAT Trigger Time: 630932397.184 [s; MET]
Trigger Stop: 630932401.28 [s; MET]
UTC: 2020-12-29T10:59:30.947160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 210.707706522396 Dec: 48.1973283679248 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.78
Image Trigger?: NO
Rate S/N Ratio: 12.6885775404495 [ if not an image trigger ]
Image S/N Ratio: 8.78
Flight Position: [ source = BAT ]
RA: 210.707706522396 Dec: 48.1973283679248 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 210.692022884813 Dec: 48.2091696160309 [deg; J2000]
{ 14h 02m 46.1s , +48d 12' 33.0" }
+/- 2.61351471855472 [arcmin] (estimated 90% radius based on SNR)
+/- 1.26163925377268 [arcmin] (formal 1-sigma fit error)
SNR: 7.71050346658863
Angular difference between Flight and Ground position is 0.947696 arcmin
Partial Coding Fraction: 0.2617188 [ including projection effects ]
Duration
T90: 53.2479999065399 +/- 4.61344127077464
Measured from: -42.960000038147
to: 10.2879998683929 [s; relative to TRIGTIME]
T50: 40.5119998455048 +/- 35.5541745186382
Measured from: -36.8799999952316
to: 3.63199985027313 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.411999940872192
to: 1.41199994087219 [s; relative to TRIGTIME]
Total Fluence
Measured from: -44.432000041008
to: 13.6159999370575 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.368714 0.777766 0.521816 0.183706
0.106331 0.111057 0.100104 0.093639 [error]
Peak 0.037525 0.079524 0.078475 0.026171
0.015444 0.015872 0.014934 0.012853 [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 1.51e-07 2.96e-07 4.49e-07 1.48e-06 1.26e-06 2.38e-06 erg/cm2
Error 4.57e-08 5.63e-08 9.61e-08 6.77e-07 2.41e-07 7.48e-07 erg/cm2
Peak flux Power-law 4.79e-01 5.47e-01 4.47e-01 6.11e-01 1.70e+00 2.08e+00 ph/cm2/s
Error 2.06e-01 1.47e-01 1.10e-01 3.14e-01 4.04e-01 4.69e-01 ph/cm2/s
Fluence Cutoff-PL 1.22e-07 3.34e-07 4.81e-07 3.44e-07 1.15e-06 1.28e-06 erg/cm2
Error 5.44e-08 7.35e-08 1.15e-07 7.86e-07 2.64e-07 7.62e-07 erg/cm2
Peak flux Cutoff-PL 4.10e-01 5.71e-01 4.84e-01 3.45e-01 1.65e+00 1.81e+00 ph/cm2/s
Error 2.56e-01 1.67e-01 -------- 4.40e-01 4.18e-01 6.01e-01 ph/cm2/s
Fluence Band 1.16e-07 3.42e-07 4.62e-07 7.14e-07 1.17e-06 1.64e-06 erg/cm2
Error 5.66e-08 8.17e-08 1.23e-07 9.29e-07 -------- -------- 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 1.398 0.288 - - 2.24e-03 3.96e-04 56.150 0
CPL 0.140 1.598 73.9 -26.6 9.61e-03 4.05e-02 53.470 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.291 0.379 - - 1.42e-02 3.18e-03 68.180 0
CPL 0.636 1.608 116.5 0.0 2.85e-02 1.36e-01 0.135 0
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: 6.912000 sec.
T50 in the 50-300 keV band: 3.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 58.048 -44.432 13.616
T90 53.248 -42.960 10.288
T50 40.512 -36.880 3.632
Peak 1.000 0.412 1.412
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
210.6920 +48.2092 0.0250 41.3 -47.6 1.8500 7.7 TRIG_01015088
------------------------------------------
Foreground time interval of the image:
-44.432 13.616 (delta_t = 58.048 [sec])
Background time interval of the image:
-239.184 -44.432 (delta_t = 194.752 [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 -44.432 sec. to 13.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39779 ( -0.289722 0.287202 )
Norm@50keV : 2.24462E-03 ( -0.000395816 0.00039519 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.15 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.07e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 58.05 sec: 0.273216 ( -0.0494007 0.0496156 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25957e-06 ( -2.39028e-07 2.42147e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -44.432 sec. to 13.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.140130 ( -1.89508 1.30002 )
Epeak [keV] : 73.9020 ( -20.6072 -73.9018 )
Norm@50keV : 9.61272E-03 ( -0.00961279 0.0712922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.47 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.71e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 58.05 sec: 0.260121 ( -0.051636 0.051663 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15474e-06 ( -2.59472e-07 2.68522e-07 ) ergs/cm2
Band function
Time interval is from -44.432 sec. to 13.616 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.114934 ( -1.34433 -0.145096 )
beta : -2.19428 ( 2.20821 0.902443 )
Epeak [keV] : 66.0302 ( -40.9235 116.22 )
Norm@50keV : 1.36407E-02 ( -0.0162616 19.3816 )
------------------------------------------------------------
Photon flux (15-150 keV) in 58.05 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17125e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.5604 (-2.72673 3.5148)
R^2/D10^2 : 2.89958E-02 (-0.014946 0.0282161)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.65 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.26e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.476e-08 2.739e-08
25- 50 3.481e-07 1.028e-07
50-150 5.827e-07 1.967e-07
15-150 1.016e-06 2.415e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-86.0648 -199.363)
Norm : 1.14064 (-0.199489 0.199481)
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.75 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.22e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.649e-07 9.584e-08
25- 50 3.172e-07 1.820e-07
50-150 6.956e-07 3.939e-07
15-150 1.178e-06 6.757e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 41.3574 (-40.2782 -40.2782)
R1^2/D10^2 : 5.39989E-04 (-0.000634801 0.0362969)
kT2 [keV] : 11.7858 (-11.6097 5.37218)
R2^2/D10^2 : 5.87800E-02 (-0.0610306 -0.0610306)
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.40e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.137e-07 7.056e-08
25- 50 3.483e-07 2.141e-07
50-150 7.089e-07 4.360e-07
15-150 1.171e-06 6.394e-07
Peak spectrum fit
Power-law model
Time interval is from 0.412 sec. to 1.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29081 ( -0.384326 0.373185 )
Norm@50keV : 1.42338E-02 ( -0.0031852 0.00318007 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.18 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.48e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.69528 ( -0.401835 0.405376 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40974e-07 ( -3.29541e-08 3.31397e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.412 sec. to 1.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.635814 ( -2.30286 0.912885 )
Epeak [keV] : 116.544 ( -116.545 -116.545 )
Norm@50keV : 2.84955E-02 ( -0.0170575 0.255267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.76 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.35e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.65465 ( -0.41632 0.41873 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37807e-07 ( -3.5138e-08 3.4452e-08 ) ergs/cm2
Band function
Time interval is from 0.412 sec. to 1.412 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.51403E-02 ( 0.524627 0.524627 )
beta : -1.62316 ( 1.79061 2.63945 )
Epeak [keV] : 72.1006 ( -73.1618 123.415 )
Norm@50keV : 6.70074E-02 ( -0.0631167 182.721 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 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] : 18.6087 (-4.27219 5.89817)
R^2/D10^2 : 0.100423 (-0.0617344 0.143894)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 70.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.14e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.886e-09 3.112e-09
25- 50 3.263e-08 1.333e-08
50-150 8.268e-08 4.056e-08
15-150 1.222e-07 5.223e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-84.2888 -199.363)
Norm : 7.19576 (-1.62272 1.62279)
------------------------------------------------------------
#Fit statistic : Chi-Squared 69.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.24e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.792e-08 1.075e-08
25- 50 3.447e-08 2.040e-08
50-150 7.559e-08 4.423e-08
15-150 1.280e-07 7.435e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 1.76065E-04 (-0.000176114 -0.000176114)
kT2 [keV] : 13.8239 (-2.76651 6.55428)
R2^2/D10^2 : 0.227586 (-0.151013 0.125179)
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.53 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.20e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.024e-08 3.836e-09
25- 50 3.084e-08 1.611e-08
50-150 8.493e-08 4.422e-08
15-150 1.260e-07 5.577e-08
Plot creation:
Tue Dec 29 16:59:48 EST 2020