Gamma-ray Burst 020604

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE


TITLE:             GCN/IPN POSITION NOTICE
NOTICE_DATE:       Fri 07 Jun 02 19:01:53 UT
NOTICE_TYPE:       IPN Single Box
IPN_NUMBER:        294
GRB_DATE:          12429 TJD;   155 DOY;   02/06/04
GRB_TIME:          51223.00 SOD {14:13:43.00} UT
GRB_IPN_RA:        246.8845d {+16h 27m 32s} (J2000),
                   246.9227d {+16h 27m 41s} (current),
                   246.0981d {+16h 24m 24s} (1950)
GRB_IPN_DEC:       -29.8059d {-29d 48' 20"} (J2000),
                   -29.8112d {-29d 48' 39"} (current),
                   -29.6949d {-29d 41' 40"} (1950)
GRB_ERROR1_RA1:    246.4874d {+16h 25m 57s} (J2000)
GRB_ERROR1_DEC1:   -29.9905d {-29d 59' 25"} (J2000)
GRB_ERROR1_RA2:    246.9987d {+16h 27m 60s} (J2000)
GRB_ERROR1_DEC2:   -29.6891d {-29d 41' 20"} (J2000)
GRB_ERROR1_RA3:    246.7711d {+16h 27m 05s} (J2000)
GRB_ERROR1_DEC3:   -29.9224d {-29d 55' 20"} (J2000)
GRB_ERROR1_RA4:    247.2866d {+16h 29m 09s} (J2000)
GRB_ERROR1_DEC4:   -29.6182d {-29d 37' 05"} (J2000)
GRB_ERROR:         23.61 [arcmin radius of circumscribing circle, 3 sigma]
GRB_BOX_AREA:      157 [sq.arcmin]
GRB_PEAK_FLUX:     4.8e-07 [erg/cm2/sec in 25-100 keV] in a 0.50 sec interval
GRB_FLUENCE:       3.1e-06 [erg/cm2 in 25-100 keV]
GRB_DURATION:      10.0 [sec]
SUN_POSTN:          72.42d {+04h 49m 42s}  +22.46d {+22d 27' 18"}
SUN_DIST:          171.14 [deg]
MOON_POSTN:          3.09d {+00h 12m 21s}   -4.29d {-04d 17' 15"}
MOON_DIST:         110.14 [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 #1417
K. Hurley and T. Cline, on behalf of the Ulysses, Mars Odyssey, and Konus GRB teams,
I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin on behalf of the HEND/Odyssey GRB team,
E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team,
D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team, and
W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS/Odyssey GRB team, report:
Ulysses, Konus, RHESSI, and HEND observed this burst at ~51223 s. As observed by Ulysses, it had a duration ~10 s, a 25-100 keV fluence of ~3E-6 erg/cm^2, and a peak flux over 0.5 s of ~5E-7 erg/cm^2 s. We have triangulated it to a preliminary, 3 sigma error box whose area is ~160 square arcminutes and whose coordinates are:
```
    RA(2000)                 DEC(2000)
 16 h 27 m 32.31 s    -29 o 48 '  21.41 "  (CENTER)
 16 h 25 m 56.99 s    -29 o 59 '  26.08 "  (CORNER)
 16 h 27 m 59.70 s    -29 o 41 '  20.90 "  (CORNER)
 16 h 27 m 05.07 s    -29 o 55 '  20.70 "  (CORNER)
 16 h 29 m 08.79 s    -29 o 37 '  05.87 "  (CORNER)
```
Some improvement in this error box is possible. A map will be posted shortly to sunspot.ssl.berkeley.edu/ipn3/020604. This server will be down from about 7 AM to 5 PM PDT Saturday, June 8.
GCN notice #1424
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:
We have acquired BVRcIc all-sky photometry for an 11x11 arcmin field centered at the coordinates for the IPN burst GRB020604 (Hurley et al., GCN 1417) with the USNOFS 1.0-m telescope on one photometric night. Stars brighter than V=14.0 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb020604.dat. The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. The photometry has potential zeropoint error of about 0.03mag. This is a fairly crowded field, so the automated reduction pipeline will have problems on blended objects.
Editorial note: the NOFS 1.0m has a hard declination limit of -31 degrees. GRB020604 is as far south as we will normally observe, and even then, our potential zeropoint error is quite large due to the high airmass. GRB020405, at -31 dec, was just outside our declination limit. Therefore, any time a burst is localized south of -30, you will not see field photometry posted from NOFS.
GCN notice #1425
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:
We imaged an 11x11 arcmin field centered at the coordinates for the IPN burst GRB020604 (Hurley et al., GCN 1417) with the USNOFS 1.0-m telescope on 020608.295 (3.7d after the burst), and again on 020611.276. Coadded images give a plate limit of V=21.5. No new object was seen within the CCD field of view, which does not contain the entire 160 square arcmin error box. This field is at galactic coordinates 349.07, +13.12 and so is cluttered with stars, with few extragalactic objects seen.
One object, present on the digitized plates available from the USNO Pixel Server (http://www.nofs.navy.mil), exhibits large variability. Located at
```
  16:27:38.28  -29:47:38.0  J2000
```
with astrometric error under 100mas, the object was V=18.9 on 020608 and V=21.4 on 020611.

GCN notice #1429
J. Gorosabel (IAA-CSIC Granada), J. Hjorth, B. L. Jensen, H. Pedersen, P. Jakobsson (Univ. of Copenhagen), J. Fynbo (IFA Aarhus), M. I. Andersen (Univ. of Oulu), report:
We have carried out optical observations of the GRB 020604 IPN error box (GCN 1417) with the 1.54 Danish Telescope (+DFOSC) on three epochs; June 8, 9 and 10. The observations were done following a mosaic as detailed below:

 =====================================================================
  Date UT         Filter   R.A.       Dec    Seeing Time since ExpTime 
  June 2002              (J2000)    (J2000)   (")   GRB (days)   (s)   
 ---------------------------------------------------------------------
  8.07874--8.11230   R  16:27:42.0 -29:48:43  1.2     3.50      4x600   
  8.11259--8.14516   R  16:28:39.8 -29:43:44  1.2     3.54      4x600   
  8.14642--8.16250   R  16:29:19.8 -29:39:44  1.1     3.56      2x600   
  8.16629--8.21525   R  16:28:01.7 -29:48:22  1.2     3.60      6x600** 
  8.21554--8.23159   R  16:27:18.4 -29:55:38  1.1     3.63      2x600   
  8.23186--8.23973   R  16:26:45.4 -29:52:52  1.0     3.64        600   
  8.27211--8.31829   I  16:28:01.7 -29:48:22  1.1     3.70      6x500** 
  8.32037--8.34111   I  16:28:39.8 -29:43:44  1.4     3.74      3x500   
  8.34216--8.36298   I  16:27:18.4 -29:55:38  1.8     3.76      3x500   
 ---------------------------------------------------------------------
  9.12684--9.21986   R  16:28:01.7 -29:48:22  1.1     4.58     10x600** 
  9.22098--9.26678   R  16:28:39.8 -29:43:44  1.2     4.65      4x600   
  9.27909--9.30354   R  16:27:18.4 -29:55:38  1.3     4.70      4x600   
  9.30392--9.31180   R  16:26:45.4 -29:52:52  1.3     4.72        600   
  9.31378--9.32165   R  16:27:42.0 -29:48:43  1.2     4.72        600   
  9.32416--9.33202   R  16:29:19.8 -29:39:44  1.5     4.74        600   
 ---------------------------------------------------------------------
 10.16572--10.24745  R  16:28:01.7 -29:48:22  1.0     5.61      6x900** 
 10.26606--10.30406  R  16:28:39.8 -29:43:44  1.3     5.69      3x900   
 10.30569--10.34051  R  16:27:18.4 -29:55:38  1.5     5.73      4x600   
 ---------------------------------------------------------------------
 ** Central part				   	              
 =====================================================================

The first and the second epoch observations cover the whole error box, whereas the third epoch images contain ~80% of it.
A gif of the performed mosaic can be seen at: http://www.dsri.dk/~jgu/grb020604/FCs/grb020604.R.8-9.06.02.1.54D.gif
The limiting magnitude depends on the error box position. For the central pointing (covering ~50% of the error box), the R-band limiting magnitude (3 sigma) at the three epochs are R=24.5, R=24.7 and R=24.9. For the rest of the error box the limiting magnitude are R=23.8, R=23.6 and R=24.0, respectively. In the I-band the limiting magnitude ranges from I=22.5 to I=23.4.
Albeit the severe Galactic extinction (AR=1.18, AI=0.86 mag), many extragalactic objects are detected in our images. Among the unsaturated objects, marginal variability (< 0.2 mag) is detected for 12 of them. None of these objects shows flux variability consistent with a decay, as expected for an optical afterglow 3.5-5.7 days after the gamma ray event.

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Jochen Greiner, last update: 13-Jun-2002 [Disclaimer]