batgrbproduct analysis for trigger=770528
batgrbproduct Analysis for Trigger=770528
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 v2.46
Process Start Time (local time): Mon Sep 4 16:27:49 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger770528/GCN5_download_cron
======================================================================
Trigger: 00770528 Segment: 000
BAT Trigger Time: 526135766.848 [s; MET]
Trigger Stop: 526135767.872 [s; MET]
UTC: 2017-09-03T12:49:07.219440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 254.511712851535 Dec: 34.9835881466908 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.84
Image Trigger?: NO
Rate S/N Ratio: 17.7763888346312 [ if not an image trigger ]
Image S/N Ratio: 9.84
Flight Position: [ source = BAT ]
RA: 254.511712851535 Dec: 34.9835881466908 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 254.523905092182 Dec: 34.9832273970707 [deg; J2000]
{ 16h 58m 05.7s , +34d 58' 59.6" }
+/- 1.2094873157594 [arcmin] (estimated 90% radius based on SNR)
+/- 0.457164629238565 [arcmin] (formal 1-sigma fit error)
SNR: 23.1801636069336
Angular difference between Flight and Ground position is 0.599750 arcmin
Partial Coding Fraction: 0.3007812 [ including projection effects ]
Duration
T90: 28.7679999470711 +/- 3.59505880999471
Measured from: -5.05199986696243
to: 23.7160000801086 [s; relative to TRIGTIME]
T50: 10.3999999761581 +/- 1.75810802264541
Measured from: 1.0320001244545
to: 11.4320001006126 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.579999983310699
to: 1.5799999833107 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.85199999809265
to: 25.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.236284 1.449679 0.843482 0.303102
0.082406 0.080996 0.067679 0.054536 [error]
Peak 0.124290 0.165090 0.103280 0.036421
0.016113 0.017125 0.013980 0.010451 [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 4.93e-07 6.96e-07 7.28e-07 1.40e-06 2.36e-06 3.32e-06 erg/cm2
Error 5.17e-08 4.50e-08 6.94e-08 2.78e-07 1.63e-07 3.39e-07 erg/cm2
Peak flux Power-law 1.63e+00 1.32e+00 7.24e-01 5.82e-01 3.93e+00 4.25e+00 ph/cm2/s
Error 2.98e-01 1.57e-01 1.18e-01 1.85e-01 4.72e-01 4.94e-01 ph/cm2/s
Fluence Cutoff-PL 4.94e-07 7.00e-07 7.26e-07 1.29e-06 2.35e-06 3.21e-06 erg/cm2
Error 5.17e-08 4.98e-08 6.93e-08 4.26e-07 1.70e-07 5.22e-07 erg/cm2
Peak flux Cutoff-PL 1.62e+00 1.33e+00 7.26e-01 5.46e-01 3.93e+00 4.22e+00 ph/cm2/s
Error 3.04e-01 1.86e-01 1.22e-01 2.98e-01 4.76e-01 5.75e-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 1.935 0.119 - - 7.42e-03 5.20e-04 73.580 57
CPL 1.919 0.474 230.1 0.0 7.57e-03 0.00e+00 73.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.867 0.202 - - 2.78e-02 3.54e-03 61.690 57
CPL 1.824 0.759 181.8 0.0 2.94e-02 0.00e+00 61.690 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: 22.144000 sec.
T50 in the 50-300 keV band: 9.984000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 34.556 -8.852 25.704
T90 28.768 -5.052 23.716
T50 10.400 1.032 11.432
Peak 1.000 0.580 1.580
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.5239 +34.9832 0.0083 46.7 -29.3 3.8599 23.2 TRIG_00770528
------------------------------------------
Foreground time interval of the image:
-8.852 25.704 (delta_t = 34.556 [sec])
Background time interval of the image:
-239.848 -8.852 (delta_t = 230.996 [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 -8.852 sec. to 25.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93501 ( -0.118166 0.120603 )
Norm@50keV : 7.41745E-03 ( -0.00052308 0.000517626 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.58 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 57 degrees of freedom
# Null hypothesis probability = 6.879541e-02
Photon flux (15-150 keV) in 34.56 sec: 1.08066 ( -0.0728015 0.0730871 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35812e-06 ( -1.62248e-07 1.62965e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.852 sec. to 25.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91880 ( -0.40817 0.538922 )
Epeak [keV] : 230.127 ( )
Norm@50keV : 7.56725E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.60 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 56 degrees of freedom
# Null hypothesis probability = 5.743846e-02
Photon flux (15-150 keV) in 34.56 sec: 1.08105 ( -0.07515 0.0718 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35062e-06 ( -1.67944e-07 1.71739e-07 ) ergs/cm2
Band function
Time interval is from -8.852 sec. to 25.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.25190E-02 ( -1.36936 -1.36936 )
beta : -2.00641 ( -0.146149 0.14869 )
Epeak [keV] : 27.6344 ( -24.3481 179.151 )
Norm@50keV : 0.175401 ( -0.175102 1025.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.17 using 59 PHA bins.
# Reduced chi-squared = 1.312 for 55 degrees of freedom
# Null hypothesis probability = 5.999760e-02
Photon flux (15-150 keV) in 34.56 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] : 10.9744 ( )
R^2/D10^2 : 0.341207 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 145.90 using 59 PHA bins.
# Reduced chi-squared = 2.5596 for 57 degrees of freedom
# Null hypothesis probability = 9.852086e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.966e-07 3.783e-08
25- 50 8.362e-07 6.065e-08
50-150 5.679e-07 9.245e-08
15-150 1.701e-06 1.244e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 84.7056 (-16.8167 24.1293)
Norm : 4.89098 (-0.503099 0.578218)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.93 using 59 PHA bins.
# Reduced chi-squared = 1.385 for 57 degrees of freedom
# Null hypothesis probability = 2.883364e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.400e-07 4.717e-08
25- 50 7.342e-07 4.596e-08
50-150 1.076e-06 2.910e-07
15-150 2.250e-06 2.523e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.37079 (-1.01766 1.03381)
R1^2/D10^2 : 1.28991 (-0.485622 0.924986)
kT2 [keV] : 33.7573 (-9.00311 19.5208)
R2^2/D10^2 : 3.77173E-03 (-0.00274096 0.00727095)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.90 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 55 degrees of freedom
# Null hypothesis probability = 6.266683e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.308e-07 7.697e-08
25- 50 7.572e-07 1.087e-07
50-150 1.182e-06 5.371e-07
15-150 2.370e-06 6.024e-07
Peak spectrum fit
Power-law model
Time interval is from 0.580 sec. to 1.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86656 ( -0.199059 0.204978 )
Norm@50keV : 2.77886E-02 ( -0.00356681 0.00350707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.69 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.120551e-01
Photon flux (15-150 keV) in 1 sec: 3.93253 ( -0.471413 0.472168 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55469e-07 ( -3.24775e-08 3.27077e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.580 sec. to 1.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82372 ( -0.883573 0.634984 )
Epeak [keV] : 181.800 ( )
Norm@50keV : 2.93613E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.69 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 56 degrees of freedom
# Null hypothesis probability = 2.800896e-01
Photon flux (15-150 keV) in 1 sec: 3.92748 ( -0.47676 0.47518 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54691e-07 ( -3.5995e-08 3.3285e-08 ) ergs/cm2
Band function
Time interval is from 0.580 sec. to 1.580 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64220 ( -6.41542 -4.6422 )
beta : -2.04717 ( -0.285466 0.251463 )
Epeak [keV] : 25.2054 ( -5.36346 4.70596 )
Norm@50keV : 2133.63 ( -245.654 54167.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.73 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 3.404042e-01
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] : 10.4937 (-1.38527 1.67385)
R^2/D10^2 : 1.55203 (-0.680147 1.1375)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.22 using 59 PHA bins.
# Reduced chi-squared = 1.425 for 57 degrees of freedom
# Null hypothesis probability = 1.924372e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.532e-08 7.250e-09
25- 50 9.386e-08 1.594e-08
50-150 5.623e-08 1.605e-08
15-150 1.854e-07 2.845e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.4119 (-29.2114 58.219)
Norm : 17.8088 (-2.99709 3.74887)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.66 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.824666e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.647e-08 7.910e-09
25- 50 7.868e-08 1.011e-08
50-150 1.202e-07 5.161e-08
15-150 2.453e-07 5.580e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.10203 (-1.74084 1.69577)
R1^2/D10^2 : 3.65452 (-1.57954 4.58898)
kT2 [keV] : 54.5386 (-33.1744 -58.034)
R2^2/D10^2 : 3.53375E-03 (-0.00269784 0.0373323)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.50 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Null hypothesis probability = 3.827606e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.485e-08 1.640e-08
25- 50 8.622e-08 2.799e-08
50-150 1.260e-07 6.353e-08
15-150 2.571e-07 8.234e-08
Plot creation:
Mon Sep 4 16:58:39 EDT 2017