GRB 000604
GCN Circular 695
Subject
GRB000604 optical non-detection
Date
2000-06-08T10:30:44Z (26 years ago)
From
Elia Leibowitz at Wise Obs, Tel Aviv U <elia@wise.tau.ac.il>
E.M. Leibowitz, E. Ofek, J. Dan and P. Ibbetson report:
On June 07.804, 07.816 and 07.839, with the CCD camera attached to the
Wise Observatory 1-m telescope, we obtained unfiltered (900 sec), R (900 sec)
and B (2400 sec) exposures, respectively, of the GRB000604 area. The object
which we have reported about in gcn 690 is not seen in any of these frames,
consistently with Diercks & Cotoros (gcn 692) and Viellet (gcn 694). We
confirm the corrected coordinates of star A, as given in gcn 692 and 694. For
the record we place our detection frame of June 6, as well as our 3 additional
frames of 1 night later, in the public domain. They can be retrieved in FITS
format from our web site http://wise-obs.tau.ac.il/~eran/GRB000604/.
GCN Circular 694
Subject
GRB000604 - Optical observations
Date
2000-06-08T01:00:02Z (26 years ago)
From
Christian Veillet at CFHT <veillet@cfht.hawaii.edu>
GRB000604 - Optical observations
The field of GRB000604 has been observed using the CFH12K CCD mosaic
camera at the prime focus of the 3.6-m CFH Telescope in the course of
the French GRB follow-up program at CFHT.
Two 600s exposures with moderate seeing (image quality between 0.9" and 1.0")
have been obtained on 2000 June 07.430 UTC (mean epoch).
Close to the location of the candidate proposed in GCN 690 (Leibowitz et al),
only a very faint source, visible on both frames, is unambiguously detected.
Its location is 15:35:54.22 +10:41:23.9 , and it is the only source within
a radius of 8" of the proposed candidate. Source A position is found as
15:35:52.64 +10:41:08.0 , in good agreement with the position posted in GCN 692.
A preliminary photometric reduction shows this source to be 3.9 +/- 0.2
magnitudes fainter in R than source A (GCN 690). Would it be the GCN 690
candidate, it would mean a ~3.5 drop in magnitude in slightly less than
0.7 day. It would then be visible on June 6.26 exposures by Diercks et
al (GCN 692).
In agreement with Diercks et al (GCN 692), I conclude that the GCN 690
candidate is likely to be unrelated to GRB000604.
An image of the candidate area is posted at
http://www.cfht.hawaii.edu/~veillet/grb.html
Another pair of images is planned tonight to allow a search for variable
sources on the whole GRB000604 field and a final check on the GCN 690
candidate.
Alain Doressoundiram is acknowledged for his help in this observation.
This message may be cited.
--
************************************************************
Dr. Christian Veillet, CFHT Senior Resident Astronomer
Phone: (808) 885-3161 http://www.cfht.hawaii.edu/~veillet/
************************************************************
GCN Circular 692
Subject
GRB000604, optical observations
Date
2000-06-07T17:09:24Z (26 years ago)
From
Alan H. Diercks at Caltech <ad@astro.caltech.edu>
A. Diercks and I. Cotoros report on behalf of the Caltech-NRAO-CARA
GRB collaboration:
We have examined our Gunn-r images of the GRB000604 error box
(Hurley et al, GCN #687) from June 6.24 - 6.28 UT (Cotoros et al, GCN
#688) and do not detect the object reported by Leibowitz (GCN #690).
The coordinates of Leibowitz's candidate fall within the overlap of
our two pointings and the combined image (5x500s) has a 5-sigma
detection limit measured relative to several USNO A2.0 stars of
approximately r ~ 22.0 +/- 0.2, though this calibration should be
considered preliminary pending more accurate photometry of the region.
We find for Leibowitz's Star A (as shown in the finding chart
http://wise-obs.tau.ac.il/~eran/GRB000604/) RA=15:35:52.6,10:41:08.8
+/- 1 arcsec measured against 58 USNO A2.0 stars. At the resolution
of our images, Leibowitz's "Star B" is identifable as a galaxy.
In addition, we have re-imaged the entire IPN error box with the
Palomar 60" from June 7.26 - 7.30 UT in Gunn-r (5x500s). Lebowitz's
object is not detected in our combined image which has a similar
limiting magnitude as the June 6 data.
Given the non-detection of Leibowitz's candidate in our data at epochs
which bracket the Wise observations, we believe this object is not
related to GRB000604.
An image of the field is available at:
http://astro.caltech.edu/~ad/grb000604/grb_im.ps
This message may be cited.
GCN Circular 690
Subject
GRB 000604 optical observations
Date
2000-06-07T14:09:10Z (26 years ago)
From
Elia Leibowitz at Wise Obs, Tel Aviv U <elia@wise.tau.ac.il>
E.M. Leibowitz, E. Ofek, J. Dunn and P. Ibbetson report:
On 2000 June 06.7577 we obtained a 600 sec unfiltered exposure of the
GRB000604 area, with the direct imaging mode of the FOSC camera, attached to
the 1-m telecope of the Wise Observatory. A star image, which has no
counterpart either on the Red or on the Blue DSS_II plates, is apparent at
(J2000) R.A.=15:35:54.67 Dec=+10:41:21.5, as measured relative to 126
USNO-A2.0 stars. The stellar image lies outside the preliminary 3 Sigma Gamma
ray error box (Hurley et al GCN 687), some 110 arcsec East of the nominal
position of the burst. On our unfiltered image, the stellar looking object is
0.2 mag fainter than star A, seen on the DSS plate at R.A.=15:35:53.59
Dec=+10:41:21.5, and 0.35 mag. fainter than star B at R.A.=15:35:54.96
Dec=10:40:32.4. Image is posted at
http://wise-obs.tau.ac.il/~eran/GRB000604/.
This message may be cited
GCN Circular 688
Subject
GRB000604, optical observations, comparison with DPOSS
Date
2000-06-06T18:53:44Z (26 years ago)
From
Alan H. Diercks at Caltech <ad@astro.caltech.edu>
I. Cotoros, A. Mahabal, S. Yost, and A. Diercks report on behalf of
the Caltech-NRAO-CARA GRB collaboration:
"We imaged the entire IPN error region of GRB000604 (Hurley et al, GCN #687)
with the Palomar 60" telescope from June 6.24 - 6.28 UT. The error region was
covered by two pointings with three 500s integrations in Gunn-r at each
pointing. Although the seeing was rather poor (1.5" FWHM), the combined frames
are significantly deeper than DPOSS (Djorgovski, astro-ph/9809187) images of
the field (limiting magnitude Gunn-r~20.5). Visual inspection of the IPN error
region reveals no new objects above the DPOSS limit."
This message may be cited.
GCN Circular 687
Subject
GRB000604 [IPN Position]
Date
2000-06-05T17:28:09Z (26 years ago)
From
Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu>
K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf of
the NEAR GRB team, and E. Mazets and S. Golenetskii, on behalf of the
Konus Wind GRB team, report:
The gamma-ray burst gods were very angry on Sunday June 4. This burst
was observed by Ulysses, NEAR, and Konus at 2114 s UT. As observed by
Ulysses, it had a duration ~15 s, a 25-100 keV fluence of ~1.3x10^-5
erg/cm^2, and a 0.25 s peak flux of ~3x10^-6 erg/cm^2 s. We have
localized it to a preliminary error box whose area is ~22 sq. arcmin.
(3 sigma) and whose coordinates are:
RA(2000) DEC(2000)
15 h 35 m 47.21 s 10 o 41 ' 17.56 " (CENTER)
15 h 35 m 42.92 s 10 o 41 ' 2.17 " (CORNER)
15 h 36 m 4.71 s 10 o 32 ' 10.77 " (CORNER)
15 h 35 m 29.72 s 10 o 50 ' 24.70 " (CORNER)
15 h 35 m 51.51 s 10 o 41 ' 32.95 " (CORNER)
This error box can be refined considerably.