Gamma-ray Burst 081022

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 22 Oct 08 14:25:05 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     332399,   Seg_Num: 0
  GRB_RA:          226.619d {+15h 06m 28s} (J2000),
                   226.724d {+15h 06m 54s} (current),
                   226.023d {+15h 04m 05s} (1950)
  GRB_DEC:         +12.416d {+12d 24' 58"} (J2000),
                   +12.382d {+12d 22' 56"} (current),
                   +12.608d {+12d 36' 30"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       0 [cnts]    Image_Peak=3431 [image_cnts]
  TRIGGER_DUR:     64.000 [sec] 
  TRIGGER_INDEX:   20000     E_range: 15-50 keV
  BKG_INTEN:       0 [cnts]
  BKG_TIME:        0.00 SOD {00:00:00.00} UT
  BKG_DUR:         0 [sec]
  GRB_DATE:        14761 TJD;   296 DOY;   08/10/22
  GRB_TIME:        51828.80 SOD {14:23:48.80} UT
  GRB_PHI:         -85.94 [deg]
  GRB_THETA:        23.10 [deg]
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    14.84 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +6  +1  +3 -100  +0 -86  +0 
  SUN_POSTN:       207.49d {+13h 49m 57s}  -11.32d {-11d 18' 54"}
  SUN_DIST:         30.43 [deg]   Sun_angle= -1.3 [hr] (East of Sun)
  MOON_POSTN:      136.15d {+09h 04m 36s}  +16.97d {+16d 58' 10"}
  MOON_DIST:        86.95 [deg]
  MOON_ILLUM:      38 [%]
  GAL_COORDS:       14.69, 55.15 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      220.14, 28.66 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 294.05,10.97 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 22 Oct 08 14:27:45 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     332399,   Seg_Num: 0
  GRB_RA:          226.619d {+15h 06m 28s} (J2000),
                   226.724d {+15h 06m 54s} (current),
                   226.023d {+15h 04m 05s} (1950)
  GRB_DEC:         +12.416d {+12d 24' 58"} (J2000),
                   +12.382d {+12d 22' 56"} (current),
                   +12.608d {+12d 36' 30"} (1950)
  GRB_DATE:        14761 TJD;   296 DOY;   08/10/22
  GRB_TIME:        51828.80 SOD {14:23:48.80} UT
  TRIGGER_INDEX:   20000
  GRB_PHI:         -85.94 [deg]
  GRB_THETA:        23.10 [deg]
  DELTA_TIME:      0.00 [sec]
  TRIGGER_DUR:     64.000 [sec] 
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    14.84 [sigma]
  LC_URL:          sw00332399000msb.lc
  SUN_POSTN:       207.49d {+13h 49m 58s}  -11.32d {-11d 18' 56"}
  SUN_DIST:         30.43 [deg]   Sun_angle= -1.3 [hr] (East of Sun)
  MOON_POSTN:      136.18d {+09h 04m 42s}  +16.96d {+16d 57' 36"}
  MOON_DIST:        86.93 [deg]
  MOON_ILLUM:      38 [%]
  GAL_COORDS:       14.69, 55.15 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      220.14, 28.66 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Lightcurve.  
  COMMENTS:           
  COMMENTS:        The next comments were copied from the BAT_POS Notice:  
  COMMENTS:        This is an image trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 294.05,10.97 [deg].  
  

  
• GCN Circular #8395
  G. Stratta (ASDC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), J. A. Kennea (PSU), J. Mao (INAF-OAB), C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), K. L. Page (U Leicester), M. Perri (ASDC), B. Preger (ASDC), P. Romano (INAF-IASFPA), B. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU), L. Vetere (PSU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
  At 14:23:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 081022 (trigger=332399). The BAT on-board calculated location is RA, Dec 226.619, +12.416 which is

     RA(J2000) = 15h 06m 28s
     Dec(J2000) = +12d 24' 58"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This was an image trigger in BAT, but the light curve shows a long, smooth, 100 second wide peak with a maximum of ~500 cts/sec at T+50 seconds.
  Due to an observing constraint, Swift cannot slew to the BAT position. There will thus be no XRT or UVOT data for this trigger.
  Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
• GCN Circular #8397
  T. N. Ukwatta (GWU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), G. Stratta (ASDC), J. Tueller (GSFC) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+903 sec from recent telemetry downlinks, we report further analysis of BAT GRB 081022 (trigger #332399) (Stratta, et al., GCN Circ. 8395). The BAT ground-calculated position is RA, Dec = 226.584, 12.409 deg which is

     RA(J2000)  =  15h 06m 20.1s 
     Dec(J2000) = +12d 24' 32.7" 
  

  with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%.
  The mask-weighted light curve shows a long smooth peak starting at ~T-10 sec, peaking around T+50 sec, and ending around T+210 sec. T90 (15-350 keV) is 160 +- 40 sec (estimated error including systematics).
  The time-averaged spectrum from T-9.3 to T+207.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.67 +- 0.11. The fluence in the 15-150 keV band is 2.5 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+57.18 sec in the 15-150 keV band is 0.6 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/332399/BA/
• GCN Report 183.1
  GCN_Report 183.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_183_1.pdf by G. Stratta at ASDC titled: "Final Swift observations of GRB 081022"