batgrbproduct analysis for trigger=1037335
batgrbproduct Analysis for Trigger=1037335
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): Fri Mar 19 13:19:12 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1037335/batgroup_hand_proc
======================================================================
Trigger: 01037335 Segment: 000
BAT Trigger Time: 637729739.584 [s; MET]
Trigger Stop: 637729740.096 [s; MET]
UTC: 2021-03-18T03:08:32.897420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.227130551932 Dec: -35.8189234589504 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.95
Image Trigger?: NO
Rate S/N Ratio: 155.441307251322 [ if not an image trigger ]
Image S/N Ratio: 21.95
Flight Position: [ source = BAT ]
RA: 264.227130551932 Dec: -35.8189234589504 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.228320857773 Dec: -35.8216598644752 [deg; J2000]
{ 17h 36m 54.8s , -35d 49' 18.0" }
+/- 0.505029658065936 [arcmin] (estimated 90% radius based on SNR)
+/- 0.102986967292629 [arcmin] (formal 1-sigma fit error)
SNR: 80.7144709141128
Angular difference between Flight and Ground position is 0.174098 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 14.7639999389648 +/- 0.463896553141211
Measured from: -1.96399998664856
to: 12.7999999523163 [s; relative to TRIGTIME]
T50: 7.37999999523163 +/- 0.113207706057046
Measured from: 0.480000019073486
to: 7.86000001430511 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.70000004768372
to: 3.70000004768372 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.00399994850159
to: 19.4240000247955 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.600177 5.815404 4.990751 1.415136
0.058199 0.062528 0.059487 0.052399 [error]
Peak 0.304079 0.681096 0.687779 0.213162
0.013734 0.017218 0.018029 0.013424 [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 1.15e-06 2.36e-06 3.81e-06 1.37e-05 1.05e-05 2.11e-05 erg/cm2
Error 4.25e-08 5.05e-08 7.06e-08 6.14e-07 1.79e-07 6.36e-07 erg/cm2
Peak flux Power-law 3.22e+00 4.40e+00 4.43e+00 8.10e+00 1.47e+01 2.01e+01 ph/cm2/s
Error 1.92e-01 1.61e-01 1.44e-01 5.63e-01 4.44e-01 6.71e-01 ph/cm2/s
Fluence Cutoff-PL 1.08e-06 2.38e-06 3.89e-06 1.06e-05 1.04e-05 1.80e-05 erg/cm2
Error 5.82e-08 5.23e-08 8.54e-08 1.66e-06 1.95e-07 1.65e-06 erg/cm2
Peak flux Cutoff-PL 2.74e+00 4.56e+00 4.77e+00 4.49e+00 1.43e+01 1.66e+01 ph/cm2/s
Error 2.39e-01 1.79e-01 1.84e-01 8.51e-01 4.57e-01 9.51e-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 1.311 0.032 - - 3.77e-02 6.33e-04 47.040 0
CPL 1.098 0.133 250.2 178.8 4.64e-02 5.90e-03 39.280 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.989 0.051 - - 1.27e-01 3.80e-03 86.980 0
CPL 0.359 0.224 148.1 36.2 2.45e-01 5.58e-02 0.322 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: 13.056000 sec.
T50 in the 50-300 keV band: 6.016000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 28.428 -9.004 19.424
T90 14.764 -1.964 12.800
T50 7.380 0.480 7.860
Peak 1.000 2.700 3.700
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.2283 -35.8217 0.0024 18.5 16.9 14.4538 80.7 TRIG_01037335
------------------------------------------
Foreground time interval of the image:
-9.004 10.717 (delta_t = 19.721 [sec])
Background time interval of the image:
-59.483 -9.004 (delta_t = 50.479 [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 -9.004 sec. to 19.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31127 ( -0.0319835 0.0319051 )
Norm@50keV : 3.76530E-02 ( -0.00063352 0.000633066 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.04 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.24e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 28.43 sec: 4.50156 ( -0.0853999 0.0856343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05495e-05 ( -1.79186e-07 1.79282e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.004 sec. to 19.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09804 ( -0.135126 0.13126 )
Epeak [keV] : 250.150 ( -73.5614 284.139 )
Norm@50keV : 4.63594E-02 ( -0.00544947 0.00635265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 39.28 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.56e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 28.43 sec: 4.42507 ( -0.09587 0.09634 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04301e-05 ( -1.95854e-07 1.94746e-07 ) ergs/cm2
Band function
Time interval is from -9.004 sec. to 19.424 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.639363 ( -0.444279 5.56866 )
beta : -1.39221 ( -0.071518 0.0729868 )
Epeak [keV] : 86.6740 ( -53.172 126.697 )
Norm@50keV : 8.55077E-02 ( -0.0398528 2.49455 )
------------------------------------------------------------
Photon flux (15-150 keV) in 28.43 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] : 19.6763 ( )
R^2/D10^2 : 0.205497 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 625.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.32e-96 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.388e-07 1.507e-08
25- 50 2.162e-06 5.231e-08
50-150 6.191e-06 1.578e-07
15-150 8.791e-06 1.649e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 19.3119 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 254.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.91e-27 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.367e-06 2.715e-08
25- 50 2.630e-06 4.847e-08
50-150 5.768e-06 1.166e-07
15-150 9.765e-06 1.820e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.91339 (-0.674305 0.717255)
R1^2/D10^2 : 1.76851 (-0.368733 0.498379)
kT2 [keV] : 33.5109 (-2.57446 3.33376)
R2^2/D10^2 : 2.83306E-02 (-0.00769127 0.0089967)
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.57 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.17e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.056e-07 5.658e-08
25- 50 2.469e-06 8.302e-08
50-150 6.996e-06 2.800e-07
15-150 1.037e-05 3.440e-07
Peak spectrum fit
Power-law model
Time interval is from 2.700 sec. to 3.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.988912 ( -0.050778 0.050513 )
Norm@50keV : 0.127433 ( -0.00380166 0.00379981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 86.98 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.44e-03 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 14.6644 ( -0.444294 0.442869 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38366e-06 ( -4.55538e-08 4.51739e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.700 sec. to 3.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.358867 ( -0.229397 0.218014 )
Epeak [keV] : 148.078 ( -24.9772 47.4234 )
Norm@50keV : 0.244788 ( -0.0482325 0.0633851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.35 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.22e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 14.3253 ( -0.4571 0.4571 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34204e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 2.700 sec. to 3.700 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99997 ( -3.57543e-05 -4.99997 )
beta : -1.15077 ( -0.0821327 0.0646103 )
Epeak [keV] : 35.2372 ( -3.08737 2.34309 )
Norm@50keV : 1217.09 ( -35.8023 824.883 )
------------------------------------------------------------
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] : 21.3017 ( )
R^2/D10^2 : 0.591895 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 174.69 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.13e-14 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.043e-08 2.950e-09
25- 50 2.615e-07 1.075e-08
50-150 8.854e-07 4.665e-08
15-150 1.197e-06 4.600e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 58.6796 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 391.09 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.47e-51 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.461e-07 4.500e-09
25- 50 2.811e-07 9.700e-09
50-150 6.165e-07 2.020e-08
15-150 1.044e-06 3.350e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.9624 (-1.5211 1.66439)
R1^2/D10^2 : 2.60352 (-0.716833 1.13201)
kT2 [keV] : 38.1983 (-5.95999 11.1826)
R2^2/D10^2 : 7.35954E-02 (-0.0401844 0.0565947)
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.35 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.15e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.965e-08 8.615e-09
25- 50 2.802e-07 3.060e-08
50-150 9.932e-07 1.973e-07
15-150 1.353e-06 1.893e-07
Plot creation:
Fri Mar 19 14:20:29 EDT 2021