Gamma-ray Burst 021023

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  
  TITLE:             GCN/IPN POSITION NOTICE
  NOTICE_DATE:       Thu 24 Oct 02 20:06:52 UT
  NOTICE_TYPE:       IPN Single Box
  IPN_NUMBER:        402
  GRB_DATE:          12570 TJD;   296 DOY;   02/10/23
  GRB_TIME:          10425.00 SOD {02:53:45.00} UT
  GRB_IPN_RA:        111.2293d {+07h 24m 55s} (J2000),
                     111.2610d {+07h 25m 03s} (current),
                     110.6645d {+07h 22m 39s} (1950)
  GRB_IPN_DEC:       -16.2809d {-16d 16' 50"} (J2000),
                     -16.2866d {-16d 17' 11"} (current),
                     -16.1814d {-16d 10' 52"} (1950)
  GRB_ERROR1_RA1:    111.0808d {+07h 24m 19s} (J2000)
  GRB_ERROR1_DEC1:   -16.1624d {-16d 09' 44"} (J2000)
  GRB_ERROR1_RA2:    111.2558d {+07h 25m 01s} (J2000)
  GRB_ERROR1_DEC2:   -16.3550d {-16d 21' 17"} (J2000)
  GRB_ERROR1_RA3:    111.2027d {+07h 24m 49s} (J2000)
  GRB_ERROR1_DEC3:   -16.2069d {-16d 12' 24"} (J2000)
  GRB_ERROR1_RA4:    111.3780d {+07h 25m 31s} (J2000)
  GRB_ERROR1_DEC4:   -16.3994d {-16d 23' 57"} (J2000)
  GRB_ERROR:         11.12 [arcmin radius of circumscribing circle, 3 sigma]
  GRB_BOX_AREA:      55 [sq.arcmin]
  GRB_PEAK_FLUX:     6.8e-07 [erg/cm2/sec in 25-100 keV] in a 0.50 sec interval
  GRB_FLUENCE:       4.1e-06 [erg/cm2 in 25-100 keV]
  GRB_DURATION:      15.0 [sec]
  SUN_POSTN:         207.46d {+13h 49m 51s}  -11.31d {-11d 18' 22"}
  SUN_DIST:           92.68 [deg]
  MOON_POSTN:         47.50d {+03h 10m 01s}  +15.89d {+15d 53' 10"}
  MOON_DIST:          70.64 [deg]
  GAL_COORDS:        231.19,-0.20 [deg] galactic lon,lat of the burst
  ECL_COORDS:        116.10,-37.82 [deg] ecliptic lon,lat of the burst
  COMMENTS:          IPN triangulation localization.  
  COMMENTS:          This is a preliminary, 3 sigma error box.  
  COMMENTS:          GCN message is being issued.  
   

• GCN notice #1653
  K. Hurley and T. Cline, on behalf of the Ulysses, Konus, MO, and HETE GRB teams,
  E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team,
  I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin, on behalf of the HEND/Odyssey GRB team,
  W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS/Odyssey GRB team, and
  G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew, G. Monnelly, N. Butler, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, J. Braga, R. Manchanda, G. Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on behalf of the HETE GRB team, report:
  Ulysses, Mars Odyssey-HEND, HETE-FREGATE, and Konus-Wind observed this GRB at 10425 seconds. As observed by Ulysses, it had a duration of approximately 15 seconds, a 25-100 keV fluence of approximately 4.1E-6 erg/cm2, and a peak flux of approximately 6.8E-07 erg/cm2 s over 0.50 seconds.
  We have triangulated it to a preliminary, 3 sigma error box whose approximate area is 55 sq. arcmin. and whose coordinates are:

      RA(2000)                              DEC(2000)
   ERROR BOX CENTER:  7 h 24 m 55.03 s      -16 o 16 '  51.55 " 
   ERROR BOX CORNER 1: 7 h 24 m 19.40 s     -16 o 09 '  44.82 " 
   ERROR BOX CORNER 2: 7 h 25 m 01.41 s     -16 o 21 '  18.28 " 
   ERROR BOX CORNER 3: 7 h 24 m 48.66 s     -16 o 12 '  24.84 " 
   ERROR BOX CORNER 4: 7 h 25 m 30.74 s     -16 o 23 '  58.17 " 
  

  This error box may be improved.
• GCN notice #1657
  GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  J. S. Bloom and E. Falco (Harvard-Smithsonian Center for Astrophysics) report:
  "On 2002 Oct 25.5, we imaged the entire IPN error box of GRB 021023 (Hurley et al.; GCN #1653) at J and Ks-bands with the FLWO 1.2m equipped with STELIRCam. A comparison between the mosaiced Ks-band image and the 2MASS K-band QUICKLOOK image* reveals a bright new source (OBJ1) at (J2000) 07:24:39.49,-16:10:56.8 (+/- 0.1"). A second source (OBJ2), which appears to be just north of a faint counterpart in the 2MASS image, is located at 07:24:39.09,-16:11:02.62. OBJ1/OBJ2 was detected in each image in two separate pointing positions, consisting of ~10-20 dithered frames of 30 sec. Therefore, OBJ1/OBJ2 is clearly not an array defect nor a cosmic ray hit. See:
  http://www-cfa.harvard.edu/~jbloom/grb021023.ps.gz
  Curiously, there is no indication of OBJ1/OBJ2 in the simultaneous J-band images, which might suggest a high redshift source or heavily dust extincted source. However, given the proximity (66") of this OBJ1/OBJ2 to FW CMa (=HD58483; V=5.33mag, type B2.5IVe), the sources themselves may be a ghosting artifact. Two points weaken this possibility: 1) earlier standard star images of HD 22686 showed no indication of ghosting at similar separations in Ks and 2) though the optical path in the blue-channel (J-band) diverges from the red-channel, FW CMa is significantly brighter in J-band and no ghosts are detected in the J-band image.
  We encourage IR follow-up to help determine the nature of OBJ1/OBJ2."
  *Summed, mosaiced 2MASS images in J,H,K were constructed using the QUICKLOOK images from the 2MASS All-sky Data Release (see http://irsa.ipac.caltech.edu/applications/2MASS/Visualizer/). These images can be obtained by request (jbloom@tdc.harvard.edu).
  We thank K. Stanek.
  This message may be cited.
• GCN notice #1659
  GRB 021023: Infrared Imaging
  J. S. Bloom and E. Falco (Harvard-Smithsonian Center for Astrophysics) report:
  "In analysis further to GCN #1657 (Bloom and Falco), we report that no new sources were detected as compared to 2MASS in the entire IPN error box given in GCN #1653 (Hurley et al.). The limiting magnitudes for any new sources in the error box at t_burst + 2.4 days are approximately J= 16.0 mag and K= 15.6 mag."
  Stacked J and K data from 2MASS and STELIRCam are available at: http://www-cfa.harvard.edu/~jbloom/GRB021023
  This message may be cited.