Gamma-ray Burst 020525

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  
  TITLE:             GCN/IPN POSITION NOTICE
  NOTICE_DATE:       Mon 27 May 02 23:02:23 UT
  NOTICE_TYPE:       IPN Single Box
  IPN_NUMBER:        279
  GRB_DATE:          12419 TJD;   145 DOY;   02/05/25
  GRB_TIME:          20164.00 SOD {05:36:04.00} UT
  GRB_IPN_RA:        172.3872d {+11h 29m 33s} (J2000),
                     172.4172d {+11h 29m 40s} (current),
                     171.7608d {+11h 27m 03s} (1950)
  GRB_IPN_DEC:       -20.3514d {-20d 21' 04"} (J2000),
                     -20.3646d {-20d 21' 52"} (current),
                     -20.0756d {-20d 04' 31"} (1950)
  GRB_ERROR1_RA1:    172.3688d {+11h 29m 29s} (J2000)
  GRB_ERROR1_DEC1:   -20.3860d {-20d 23' 09"} (J2000)
  GRB_ERROR1_RA2:    172.4905d {+11h 29m 58s} (J2000)
  GRB_ERROR1_DEC2:   -20.3623d {-20d 21' 43"} (J2000)
  GRB_ERROR1_RA3:    172.2839d {+11h 29m 08s} (J2000)
  GRB_ERROR1_DEC3:   -20.3404d {-20d 20' 24"} (J2000)
  GRB_ERROR1_RA4:    172.4055d {+11h 29m 37s} (J2000)
  GRB_ERROR1_DEC4:   -20.3169d {-20d 19' 00"} (J2000)
  GRB_ERROR:         3.49 [arcmin radius of circumscribing circle, 3 sigma]
  GRB_BOX_AREA:      25 [sq.arcmin]
  GRB_PEAK_FLUX:     8.0e-07 [erg/cm2/sec in 25-100 keV]
  GRB_FLUENCE:       1.0e-05 [erg/cm2 in 25-100 keV]
  GRB_DURATION:      25.0 [sec]
  SUN_POSTN:          61.86d {+04h 07m 26s}  +20.92d {+20d 55' 15"}
  SUN_DIST:          115.58 [deg]
  MOON_POSTN:        225.30d {+15h 01m 13s}  -14.42d {-14d 25' 15"}
  MOON_DIST:          50.61 [deg]
  COMMENTS:          IPN triangulation localization.  
  COMMENTS:          This is a preliminary, 3 sigma error box.  
  COMMENTS:          GCN message is being issued.  
   
  
  

• red DSS finding chart ps-file
  
  
• GCN notice #1395
  K. Hurley, on behalf of the Ulysses GRB team,
  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
  T. Cline, on behalf of the Ulysses, Konus, and MO GRB teams, report:
  Ulysses, Konus, and MO-HEND observed this burst at 20164 s. As observed by Ulysses, it had a duration of ~25 s, a 25-100 keV fluence of 1E-5 erg/cm^2, and a peak flux over 0.5 s of 8E-7 erg/cm^2 s. Triangulation gives a preliminary ~25 sq. arcmin. error box (3 sigma) whose coordinates are:

  11 h 29 m 32.93 s    -20 o 21 '  05.28 " (CENTER)
  11 h 29 m 28.52 s    -20 o 23 '  09.64 " (CORNER)   
  11 h 29 m 57.73 s    -20 o 21 '  44.51 " (CORNER)   
  11 h 29 m  8.15 s    -20 o 20 '  25.79 " (CORNER)   
  11 h 29 m 37.34 s    -20 o 19 '  00.91 " (CORNER)
  

  This error box may be improved.
• GCN notice #1397
  A. Henden (USRA/USNO), on behalf of the USNOFS GRB team, and P. Nelson (Ellinbank Observatory, Victoria), on behalf of the AAVSO International GRB Network, report:
  We have observed the entire IPN error box for GRB020525 (Hurley et al., GCN 1395) using unfiltered exposures. The NOFS 1.0m observations were made at relatively high airmass, with scattered cirrus and full moon; the Ellinbank 0.3m observations had clear conditions but with full moon interference. This field is at galactic coordinates 278.1d longitude and 38.6d latitude and has several faint galaxies. Comparing with USNO-A and the USNO PMM scans of the southern R plate, we find no new objects to the plate limit. The log of observations:
  UTmid exp tel mlim 020528.178 9x5min 1.0m 22 020528.518 6x20min 0.3m 19
  The brightest object not on the photographic plate is at 11:29:30.49 -20:18:41.9 J2000
  but may be non-stellar.
• GCN notice #1398
  M. Nysewander, L. Johnson, D. Moschler, J. Richuso, J. Rose (U. North Carolina), and D. Reichart (Caltech) report:
  We observed ~95% of the ~25 square arcminute error box of GRB 020525 (GCN 1395) with the 0.6-meter Morehead Observatory telescope beginning 2.95 days after the burst. We integrated without filter for 2460 seconds under poor observing conditions (scattered cirrus, relatively high air mass, and a nearly full moon).
  Visual comparison with the DSS reveals no transients down to our limiting magnitude, which we estimate to be V ~ 17 mag. This is consistent with the deeper searches of Henden et al. (GCN 1397).