batgrbproduct analysis for trigger=770957
batgrbproduct Analysis for Trigger=770957
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): Wed Sep 6 11:17:06 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger770957/batgroup_hand_proc
======================================================================
Trigger: 00770957 Segment: 000
BAT Trigger Time: 526351411.264 [s; MET]
Trigger Stop: 526351412.288 [s; MET]
UTC: 2017-09-06T00:43:11.622660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 203.991655598506 Dec: -47.124728592814 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.35
Image Trigger?: NO
Rate S/N Ratio: 24.3104915622864 [ if not an image trigger ]
Image S/N Ratio: 8.35
Flight Position: [ source = BAT ]
RA: 203.991655598506 Dec: -47.124728592814 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 203.94882333583 Dec: -47.088414842653 [deg; J2000]
{ 13h 35m 47.7s , -47d 05' 18.3" }
+/- 1.3358429490884 [arcmin] (estimated 90% radius based on SNR)
+/- 0.486771790929972 [arcmin] (formal 1-sigma fit error)
SNR: 20.112580946711
Angular difference between Flight and Ground position is 2.794093 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 88.1039999127388 +/- 1.46661657727836
Measured from: 7.65200001001358
to: 95.7559999227524 [s; relative to TRIGTIME]
T50: 42.0799999237061 +/- 0.444000013776728
Measured from: 30.2360000014305
to: 72.3159999251366 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 29.8199999928474
to: 30.8199999928474 [s; relative to TRIGTIME]
Total Fluence
Measured from: -44.9399999976158
to: 121.463999986649 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 13.151544 18.534298 15.030155 3.714733
0.117375 0.118676 0.105657 0.081011 [error]
Peak 0.284036 0.470221 0.482579 0.157754
0.012453 0.014823 0.015034 0.011285 [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 4.12e-06 7.79e-06 1.14e-05 3.54e-05 3.22e-05 5.87e-05 erg/cm2
Error 1.25e-07 1.40e-07 1.53e-07 1.12e-06 4.12e-07 1.14e-06 erg/cm2
Peak flux Power-law 2.57e+00 3.34e+00 3.18e+00 5.36e+00 1.09e+01 1.44e+01 ph/cm2/s
Error 1.83e-01 1.42e-01 1.22e-01 4.52e-01 3.83e-01 5.41e-01 ph/cm2/s
Fluence Cutoff-PL 3.80e-06 7.80e-06 1.17e-05 2.78e-05 3.19e-05 5.11e-05 erg/cm2
Error 1.76e-07 1.43e-07 2.01e-07 2.82e-06 4.33e-07 2.83e-06 erg/cm2
Peak flux Cutoff-PL 2.49e+00 3.36e+00 3.22e+00 4.71e+00 1.08e+01 1.38e+01 ph/cm2/s
Error 2.28e-01 1.49e-01 1.49e-01 1.02e+00 3.99e-01 1.04e+00 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 1.454 0.024 - - 2.02e-02 2.77e-04 52.700 57
CPL 1.212 0.104 205.4 71.9 2.53e-02 2.35e-03 36.350 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.072 0.062 - - 9.40e-02 3.22e-03 49.980 57
CPL 0.950 0.215 494.9 0.0 1.07e-01 2.17e-02 49.170 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: 80.448000 sec.
T50 in the 50-300 keV band: 34.816000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 166.404 -44.940 121.464
T90 88.104 7.652 95.756
T50 42.080 30.236 72.316
Peak 1.000 29.820 30.820
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
203.9488 -47.0884 0.0096 20.6719 -86.8862 3.7090745 20.113 TRIG_00770957
Foreground time interval of the image:
-44.940 13.037 (delta_t = 57.977 [sec])
Background time interval of the image:
-98.363 -44.940 (delta_t = 53.423 [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 -44.940 sec. to 121.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45384 ( -0.0243128 0.0242385 )
Norm@50keV : 2.02491E-02 ( -0.000276707 0.000276308 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.70 using 59 PHA bins.
# Reduced chi-squared = 0.9245 for 57 degrees of freedom
# Null hypothesis probability = 6.370698e-01
Photon flux (15-150 keV) in 166.4 sec: 2.49781 ( -0.0417939 0.0419581 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22205e-05 ( -4.12331e-07 4.12309e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -44.940 sec. to 121.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21208 ( -0.104937 0.102844 )
Epeak [keV] : 205.386 ( -42.8389 100.888 )
Norm@50keV : 2.52602E-02 ( -0.00222206 0.00247986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.35 using 59 PHA bins.
# Reduced chi-squared = 0.6492 for 56 degrees of freedom
# Null hypothesis probability = 9.806714e-01
Photon flux (15-150 keV) in 166.4 sec: 2.43904 ( -0.04737 0.04775 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.192e-05 ( -4.32973e-07 4.32806e-07 ) ergs/cm2
Band function
Time interval is from -44.940 sec. to 121.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.930541 ( -0.351845 0.46627 )
beta : -1.54468 ( 1.54488 0.0511727 )
Epeak [keV] : 100.859 ( -37.0426 153.14 )
Norm@50keV : 3.59540E-02 ( -0.012278 0.0320913 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.42 using 59 PHA bins.
# Reduced chi-squared = 0.6441 for 55 degrees of freedom
# Null hypothesis probability = 9.814195e-01
Photon flux (15-150 keV) in 166.4 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] : 20.2158 ( )
R^2/D10^2 : 9.83878E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1126.56 using 59 PHA bins.
# Reduced chi-squared = 19.7641 for 57 degrees of freedom
# Null hypothesis probability = 1.902556e-198
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.284e-06 3.794e-08
25- 50 6.443e-06 1.389e-07
50-150 1.955e-05 3.245e-07
15-150 2.727e-05 3.494e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.6468 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 180.24 using 59 PHA bins.
# Reduced chi-squared = 3.1621 for 57 degrees of freedom
# Null hypothesis probability = 1.035589e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.411e-06 7.072e-08
25- 50 8.486e-06 1.431e-07
50-150 1.861e-05 2.995e-07
15-150 3.151e-05 5.325e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.98456 (-0.482163 0.497839)
R1^2/D10^2 : 1.00176 (-0.160292 0.201184)
kT2 [keV] : 32.5325 (-1.6431 1.92779)
R2^2/D10^2 : 1.52038E-02 (-0.00282752 0.00316213)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.65 using 59 PHA bins.
# Reduced chi-squared = 0.9572 for 55 degrees of freedom
# Null hypothesis probability = 5.650997e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.016e-06 1.464e-07
25- 50 8.083e-06 1.914e-07
50-150 2.038e-05 4.742e-07
15-150 3.148e-05 5.990e-07
Peak spectrum fit
Power-law model
Time interval is from 29.820 sec. to 30.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07233 ( -0.0619755 0.0616821 )
Norm@50keV : 9.40327E-02 ( -0.00322469 0.00322231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.8768 for 57 degrees of freedom
# Null hypothesis probability = 7.335356e-01
Photon flux (15-150 keV) in 1 sec: 10.8798 ( -0.383157 0.383469 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.91992e-07 ( -3.75348e-08 3.76146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 29.820 sec. to 30.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.950381 ( -0.241792 0.187472 )
Epeak [keV] : 494.920 ( -494.92 -494.92 )
Norm@50keV : 0.106569 ( -0.0145067 0.0289933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.17 using 59 PHA bins.
# Reduced chi-squared = 0.8781 for 56 degrees of freedom
# Null hypothesis probability = 7.290124e-01
Photon flux (15-150 keV) in 1 sec: 10.8178 ( -0.3994 0.3995 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.8657e-07 ( -3.9503e-08 3.932e-08 ) ergs/cm2
Band function
Time interval is from 29.820 sec. to 30.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99996 ( -4.99996 -4.99996 )
beta : -1.09186 ( -0.0648043 0.0645292 )
Epeak [keV] : 24.0183 ( -24.0183 3.77186 )
Norm@50keV : 8496.69 ( -289.351 1.59558e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.09 using 59 PHA bins.
# Reduced chi-squared = 0.8744 for 55 degrees of freedom
# Null hypothesis probability = 7.336799e-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] : 21.1451 ( )
R^2/D10^2 : 0.429800 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 206.77 using 59 PHA bins.
# Reduced chi-squared = 3.6275 for 57 degrees of freedom
# Null hypothesis probability = 7.452229e-19
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.620e-08 2.470e-09
25- 50 1.869e-07 9.150e-09
50-150 6.231e-07 3.655e-08
15-150 8.461e-07 3.500e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 44.6245 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 214.77 using 59 PHA bins.
# Reduced chi-squared = 3.7678 for 57 degrees of freedom
# Null hypothesis probability = 3.827173e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.111e-07 4.050e-09
25- 50 2.137e-07 7.650e-09
50-150 4.688e-07 1.695e-08
15-150 7.937e-07 3.025e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.77900 (-1.25594 1.38792)
R1^2/D10^2 : 4.03329 (-1.39178 2.46219)
kT2 [keV] : 36.9692 (-4.92767 7.70843)
R2^2/D10^2 : 6.33632E-02 (-0.0275467 0.0367232)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.19 using 59 PHA bins.
# Reduced chi-squared = 0.9126 for 55 degrees of freedom
# Null hypothesis probability = 6.585021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.153e-08 1.039e-08
25- 50 2.007e-07 2.080e-08
50-150 7.227e-07 9.375e-08
15-150 9.949e-07 1.302e-07
Plot creation:
Wed Sep 6 12:21:58 EDT 2017