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.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Sun Oct 23 23:58:32 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1090853
======================================================================
Trigger: 01090853 Segment: 000
BAT Trigger Time: 662130767.424 [s; MET]
Trigger Stop: 662130771.52 [s; MET]
UTC: 2021-12-25T13:12:19.104820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.568373830299 Dec: 17.2625625868679 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.17
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 9.17
Analysis Position: [ source = BAT ]
RA: 258.568373830299 Dec: 17.2625625868679 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 258.545136051457 Dec: 17.2768509449536 [deg; J2000]
{ 17h 14m 10.8s , +17d 16' 36.7" }
+/- 0.514878835700222 [arcmin] (estimated 90% radius based on SNR)
+/- 0.128342795339958 [arcmin] (formal 1-sigma fit error)
SNR: 78.5178361229359
Angular difference between the analysis and refined position is 1.583546 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 121.519999980927 +/- 2.9694658728837
Measured from: 4.61199998855591
to: 126.131999969482 [s; relative to TRIGTIME]
T50: 27.8359999656677 +/- 0.81073800487038
Measured from: 48.2559999227524
to: 76.0919998884201 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 50.1879999637604
to: 51.1879999637604 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.7760000228882
to: 139.815999984741 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.685955 9.997282 7.152638 1.496354
0.101471 0.104583 0.091258 0.071521 [error]
Peak 0.185817 0.291992 0.256508 0.053879
0.009556 0.010872 0.010552 0.006634 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 164.592 -24.776 139.816
T90 121.520 4.612 126.132
T50 27.836 48.256 76.092
Peak 1.000 50.188 51.188
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.599 -0.033 0.033 - - - 1.01e-02 -1.72e-04 1.72e-04 62.800 57
CPL -1.320 -0.138 0.142 139.775 -28.259 76.988 1.34e-02 -1.68e-03 1.98e-03 50.610 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.331 -0.072 0.072 - - - 5.08e-02 -2.18e-03 2.18e-03 72.330 57
CPL -0.611 -0.306 0.329 102.451 -17.129 36.791 1.13e-01 -3.15e-02 4.78e-02 54.600 56
=== 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 PL 2.33e-06 4.03e-06 5.32e-06 1.43e-05 1.56e-05 2.60e-05 erg/cm2
90%_error_low -8.48e-08 -8.48e-08 -1.06e-07 -6.59e-07 -2.66e-07 -7.00e-07 erg/cm2
90%_error_hi 8.62e-08 8.46e-08 1.06e-07 6.80e-07 2.66e-07 7.15e-07 erg/cm2
Peak flux PL 1.78e+00 1.98e+00 1.57e+00 2.07e+00 6.10e+00 7.40e+00 ph/cm2/s
90%_error_low -1.34e-01 -9.35e-02 -8.15e-02 -2.12e-01 -2.64e-01 -3.28e-01 ph/cm2/s
90%_error_hi 1.37e-01 9.31e-02 8.11e-02 2.27e-01 2.65e-01 3.29e-01 ph/cm2/s
Fluence CPL 2.15e-06 4.07e-06 5.45e-06 1.03e-05 1.53e-05 2.20e-05 erg/cm2
90%_error_low -1.16e-07 -8.82e-08 -1.23e-07 -1.46e-06 -2.98e-07 -1.49e-06 erg/cm2
90%_error_hi 1.18e-07 8.84e-08 1.24e-07 1.77e-06 2.97e-07 1.79e-06 erg/cm2
Peak flux CPL 1.52e+00 2.09e+00 1.69e+00 1.05e+00 5.92e+00 6.35e+00 ph/cm2/s
90%_error_low -1.64e-01 -1.08e-01 -9.71e-02 -2.48e-01 -2.75e-01 -3.78e-01 ph/cm2/s
90%_error_hi 1.68e-01 1.09e-01 9.83e-02 3.32e-01 2.75e-01 4.23e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 258.5451 17.2769 0.0024 4.0668 -113.4534 19.4940108 78.518 TRIG_01090853 Foreground time interval of the image: -24.776 74.277 (delta_t = 99.053 [sec]) Background time interval of the image: -239.424 -24.776 (delta_t = 214.648 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
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 -24.776 sec. to 139.816 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.59937 ( -0.032958 0.0329704 ) Norm@50keV : 1.01026E-02 ( -0.000171658 0.000171632 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 62.80 using 59 bins. Reduced chi-squared = 1.10175 # Null hypothesis probability of 2.78e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 164.6 sec: 1.29802 ( -0.02669 0.02681 ) ph/cm2/s Energy fluence (15-150 keV) : 1.5555e-05 ( -2.65971e-07 2.65854e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.776 sec. to 139.816 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32031 ( -0.137782 0.141794 ) Epeak [keV] : 139.775 ( -28.2586 76.9879 ) Norm@50keV : 1.33576E-02 ( -0.00168251 0.00198321 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 50.61 using 59 bins. Reduced chi-squared = 0.90375 # Null hypothesis probability of 6.78e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 164.6 sec: 1.26382 ( -0.0308 0.03105 ) ph/cm2/s Energy fluence (15-150 keV) : 1.52781e-05 ( -2.98191e-07 2.97299e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 50.188 sec. to 51.188 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33133 ( -0.0719705 0.071686 ) Norm@50keV : 5.08271E-02 ( -0.00217725 0.00217589 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 72.33 using 59 bins. Reduced chi-squared = 1.26895 # Null hypothesis probability of 8.30e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 6.10028 ( -0.26445 0.26461 ) ph/cm2/s Energy fluence (15-150 keV) : 4.98597e-07 ( -2.38196e-08 2.39075e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.188 sec. to 51.188 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.611207 ( -0.306053 0.329429 ) Epeak [keV] : 102.451 ( -17.1284 36.7916 ) Norm@50keV : 0.112528 ( -0.0315361 0.0478343 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 54.60 using 59 bins. Reduced chi-squared = 0.975 # Null hypothesis probability of 5.28e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 5.91916 ( -0.27463 0.27464 ) ph/cm2/s Energy fluence (15-150 keV) : 4.78355e-07 ( -2.58014e-08 2.57604e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -2.829766426403050E-02, IMY = 6.522529208728120E-02
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.424000 -24.776000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0034 -15.6424 0.8 37.1 -48.6 6.4876 14.2 1.4 Sco X-1 254.6997 35.2682 0.0 15.3 112.6 -0.1150 -0.4 12.7 Her X-1 268.2452 -1.5124 5.4 25.0 -97.1 0.7001 2.1 8.2 SW J1753.5-0127 274.0513 -13.9486 49.8 38.6 -95.1 -0.1865 -0.2 5.9 GX 17+2 288.7678 10.7910 12.1 33.4 -144.3 0.3091 1.0 9.4 GRS 1915+105 299.5872 35.2028 0.6 41.6 173.8 8.4313 18.1 0.2 Cyg X-1 308.2594 41.0349 8.7 49.3 167.3 -1.0180 -1.3 8.4 Cyg X-3 201.0868 23.8959 4.1 50.2 39.7 4.4512 2.8 ------ UNKNOWN 292.0379 31.0118 3.4 34.7 178.8 1.0538 3.4 ------ UNKNOWN 239.5393 11.2696 2.8 17.6 -2.8 1.0119 4.2 ------ UNKNOWN 264.4962 4.3871 2.4 18.0 -96.1 1.3792 4.7 ------ UNKNOWN 291.7997 4.6883 4.0 38.6 -136.8 1.1815 2.9 ------ UNKNOWN 305.4723 0.2059 2.2 52.8 -139.5 6.3507 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -24.776000 74.276600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8780 -15.7367 9.1 37.2 -48.4 -0.5237 -1.3 8.2 Sco X-1 254.6572 35.2693 3.9 15.3 112.5 -0.7674 -3.0 10.7 Her X-1 268.4880 -1.3855 11.4 25.0 -97.8 -0.3302 -1.0 8.2 SW J1753.5-0127 273.9175 -13.9109 8.9 38.5 -95.0 1.0155 1.3 9.1 GX 17+2 288.8369 11.0479 19.4 33.4 -144.8 -0.2075 -0.6 6.5 GRS 1915+105 299.4081 35.1855 52.7 41.5 173.8 -0.0974 -0.2 9.0 Cyg X-1 308.1104 40.9511 236.2 49.2 167.3 0.0351 0.0 0.1 Cyg X-3 284.5499 42.7742 2.7 33.4 155.2 1.4628 4.2 ------ UNKNOWN 218.3143 4.4899 2.8 39.3 6.4 1.6226 4.2 ------ UNKNOWN 214.1954 -1.9292 2.1 45.9 1.0 2.4877 5.4 ------ UNKNOWN 311.8279 30.1089 2.5 51.6 -178.4 3.0836 4.6 ------ UNKNOWN 258.5451 17.2768 0.1 4.1 -113.5 19.4937 78.5 ------ UNKNOWN 263.1980 9.5585 2.4 12.9 -102.2 1.1551 4.7 ------ UNKNOWN 298.1424 11.6473 2.1 41.9 -150.4 2.3505 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 159.076590 372.276600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3651 35.3509 7.2 44.2 -28.9 0.8130 1.6 4.6 Her X-1 288.8072 10.8753 10.4 36.5 -91.1 -0.8423 -1.1 4.2 GRS 1915+105 299.5943 35.2130 0.4 11.2 -71.4 8.8655 32.4 0.7 Cyg X-1 308.0693 40.9286 1.8 2.5 -55.1 1.4851 6.3 2.3 Cyg X-3 326.0503 38.2055 41.4 11.8 151.7 0.0690 0.3 9.0 Cyg X-2 211.2200 82.1335 3.6 50.2 39.7 4.3933 3.2 ------ UNKNOWN 217.2366 63.0416 3.1 55.4 16.5 5.6510 3.8 ------ UNKNOWN 328.9899 14.7000 2.8 31.0 -165.1 1.2577 4.2 ------ UNKNOWN 336.1227 2.3251 3.0 45.2 -166.5 1.8594 3.8 ------ UNKNOWN 241.5910 42.1478 2.8 50.3 -14.8 2.4422 4.1 ------ UNKNOWN 266.1936 25.4233 3.2 40.4 -49.3 1.7671 3.6 ------ UNKNOWN 291.5470 4.3319 2.7 41.2 -99.5 4.6035 4.2 ------ UNKNOWN