Gamma-ray Burst 081003B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:          GCN/INTEGRAL NOTICE
  NOTICE_DATE:    Fri 03 Oct 08 20:48:39 UT
  NOTICE_TYPE:    INTEGRAL Wakeup
  TRIGGER_NUM:    5361,   Sub_Num: 0
  GRB_RA:         285.0566d {+19h 00m 14s} (J2000),
                  285.1547d {+19h 00m 37s} (current),
                  284.4965d {+18h 57m 59s} (1950)
  GRB_DEC:        +16.6707d {+16d 40' 15"} (J2000),
                  +16.6834d {+16d 41' 00"} (current),
                  +16.5997d {+16d 35' 59"} (1950)
  GRB_ERROR:      3.25 [arcmin, radius, statistical only]
  GRB_INTEN:      8.26 [sigma]
  GRB_TIME:       74896.09 SOD {20:48:16.09} UT
  GRB_DATE:       14742 TJD;   277 DOY;   08/10/03
  SC_RA:          273.50 [deg] (J2000)
  SC_DEC:          17.50 [deg] (J2000)
  SUN_POSTN:      190.12d {+12h 40m 29s}   -4.36d {-04d 21' 19"}
  SUN_DIST:        96.06 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
  MOON_POSTN:     239.80d {+15h 59m 11s}  -25.51d {-25d 30' 34"}
  MOON_DIST:       61.06 [deg]
  GAL_COORDS:      48.80,  5.63 [deg] galactic lon,lat of the burst
  ECL_COORDS:     288.71, 39.14 [deg] ecliptic lon,lat of the burst
  COMMENTS:       INTEGRAL GRB Coordinates.  
  COMMENTS:       Possibly real GRB event  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:          GCN/INTEGRAL NOTICE
  NOTICE_DATE:    Fri 03 Oct 08 20:51:38 UT
  NOTICE_TYPE:    INTEGRAL Refined
  TRIGGER_NUM:    5361,   Sub_Num: 1
  GRB_RA:         285.0340d {+19h 00m 08s} (J2000),
                  285.1321d {+19h 00m 32s} (current),
                  284.4740d {+18h 57m 54s} (1950)
  GRB_DEC:        +16.6824d {+16d 40' 57"} (J2000),
                  +16.6951d {+16d 41' 42"} (current),
                  +16.6115d {+16d 36' 41"} (1950)
  GRB_ERROR:      2.77 [arcmin, radius, statistical only]
  GRB_INTEN:      14.59 [sigma]
  GRB_TIME:       74897.72 SOD {20:48:17.72} UT
  GRB_DATE:       14742 TJD;   277 DOY;   08/10/03
  SC_RA:          273.50 [deg] (J2000)
  SC_DEC:          17.50 [deg] (J2000)
  SUN_POSTN:      190.12d {+12h 40m 29s}   -4.36d {-04d 21' 22"}
  SUN_DIST:        96.04 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
  MOON_POSTN:     239.82d {+15h 59m 18s}  -25.51d {-25d 30' 49"}
  MOON_DIST:       61.04 [deg]
  GAL_COORDS:      48.80,  5.66 [deg] galactic lon,lat of the burst
  ECL_COORDS:     288.69, 39.15 [deg] ecliptic lon,lat of the burst
  COMMENTS:       INTEGRAL GRB Coordinates.  
  COMMENTS:       Possibly real GRB event  
  

• GCN NOTICE
  

  TITLE:          GCN/INTEGRAL NOTICE
  NOTICE_DATE:    Fri 03 Oct 08 21:43:51 UT
  NOTICE_TYPE:    INTEGRAL Offline
  TRIGGER_NUM:    5361,   Sub_Num: 2
  GRB_RA:         285.0255d {+19h 00m 06s} (J2000),
                  285.1236d {+19h 00m 30s} (current),
                  284.4656d {+18h 57m 52s} (1950)
  GRB_DEC:        +16.6913d {+16d 41' 29"} (J2000),
                  +16.7040d {+16d 42' 14"} (current),
                  +16.6205d {+16d 37' 14"} (1950)
  GRB_ERROR:      1.50 [arcmin, radius, statistical only]
  GRB_INTEN:      14.59 [sigma]
  GRB_TIME:       74897.72 SOD {20:48:17.72} UT
  GRB_DATE:       14742 TJD;   277 DOY;   08/10/03
  SC_RA:          273.50 [deg] (J2000)
  SC_DEC:          17.50 [deg] (J2000)
  SUN_POSTN:      190.15d {+12h 40m 37s}   -4.37d {-04d 22' 12"}
  SUN_DIST:        96.01 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
  MOON_POSTN:     240.30d {+16h 01m 12s}  -25.59d {-25d 35' 23"}
  MOON_DIST:       60.76 [deg]
  GAL_COORDS:      48.80,  5.67 [deg] galactic lon,lat of the burst
  ECL_COORDS:     288.68, 39.16 [deg] ecliptic lon,lat of the burst
  COMMENTS:       INTEGRAL GRB Coordinates.  
  COMMENTS:       refined_coordinates_after_offline_analysis  
  

• GCN Circular #8317
  D.Gotz (CEA-Saclay), S.Mereghetti, A.Paizis (IASF-Milano), F. Fontani, V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
  A GRB lasting about 30 s has been detected by IBAS in IBIS/ISGRI data at 20:48:08 UT of October 3. The coordinates (J2000) are:

  RA = 285.0256 [degrees]
  DEC= +16.6914[degrees]
  

  with an uncertainty of 1.5 arcmin (90% c.l.).
  A preliminary analysis gives a peak flux in the 20-200 keV range of about 3 ph/cmq/s (1-s integration time) and a fluence over the same energy range of about 6x10e-6 erg/cmq.
  A plot of the light curve will be posted at
  http://ibas.iasf-milano.inaf.it/IBAS_Results.html
  This message can be cited.
• GCN Circular #8320
  Martin Jelinek, Javier Gorosabel, Fran Aceituno, Alberto Castro-Tirado (IAA CSIC Granada) and Antonio de Ugarte Postigo (ESO Santiago)
  report on behalf of a larger collaboration:
  We observed the error box of the INTEGRAL GRB081003B (Gotz et al., GCN8317) with the 30cm BOOTES-1B in El Arenosillo and with the 1.5m telescope at Observatorio Sierra Nevada.
  BOOTES started obtaining unfiltered images at 20:48:49UT (41s after the GRB trigeer), single images have a detection limit of ~14 mag. The combination of the first 32 images with an exposure mean time of 80s after the GRB has a limit of ~17.6mag (calibrated against GSC2). Neither shows any new sources within the GRB errorbox.
  The 1.5m telescope took a single I-band 300s exposure starting at 21:21:59 (mid exposure ~26.5 min after the GRB), this image does not reveal any new source in comparison with DSS-IR, but goes deeper. Further comparison image would be needed to exploit full potential of this observation.
  This message may be cited.
• GCN Circular #8324
  K.L. Page (U. Leicester) & C.B. Markwardt (CRESST/GSFC/UMD) report on behalf of the Swift-XRT team:
  Swift-XRT performed a Target of Opportunity observation of the INTEGRAL GRB 081003B (Gotz et al., GCN Circ. 8317), starting ~29 ks after the trigger. No source is detected within or near to the INTEGRAL error circle during a 3.6 ks Photon Counting mode observation. The 3-sigma upper limit on the count rate is 0.002 count s^-1, corresponding to an approximate observed 0.3-10 keV flux of 1x10^-13 erg cm^-2 s^-1 (using a standard counts to flux conversion factor).
  This circular is an official product of the Swift-XRT team.
• GCN Circular #8326
  Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
  We imaged the field of GRB 081003 detected by INTEGRAL (trigger 5361) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
  2008-10-03T20:48:45.809
  The observations started 29.7s after the GRB trigger (7s after the notice) when the gamma emission was still active. The elevation of the field decreased from 41 degrees above horizon and weather conditions were good.
  The date of trigger : t0 = 2008-10-03T20:48:16.09
  The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT at the position provived by Gotz (GCNC 8317) with a limiting magnitude of:
  t0+29.7s to t0+89.7s : R > 16.9
  The second image is 30.0s exposure in tracking mode: t0+97.0s to t0+127.0s : R > 17.4
  Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
  N.B. Galactic coordinates are lon= 48.80 lat= +5.63 and the galactic extinction in R band is 2.0 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
  This message may be cited.