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GCN Circular 788

Subject

GRB 000830: Optical observations

Date

2000-09-05T21:41:40Z (24 years ago)

From

Brian Lindgren Jensen at U.of Copenhagen <brian_j@astro.ku.dk>

B. L. Jensen, H. Pedersen, J. Hjorth (U. of Copenhagen)
J. Gorosabel (DSRI, Copenhagen), J. P. U. Fynbo (ESO, Garching)
and W. Nowotny (U. of Vienna), on behalf of a larger European
GRB collaboration, report:

"We have obtained images covering the error box of GRB 000830
(Hurley et al, GCN #779Not found
 
 
) with the 2.56-m Nordic Optical Telescope
(NOT) (+ALFOSC) on La Palma, and the 1.54-m Danish Telescope
(+DFOSC) on La Silla, as follows:

Start (UT)   Tel.  Filter  Exp.time  Seeing Lim.Mag
===================================================
Aug. 31.98   NOT      R      6x600s   0.9"   ~24.5
Sept. 1.00   NOT      I      4x300s   0.8"   ~23.3      
  "   1.02   NOT      U      3x300s   1.1"   ~23.5
  "   1.09   DK1.5m   R     8x1200s   1.6"   ~24.2
  "   1.21   DK1.5m   V     6x1200s   1.7"   ~24.5
Sept. 2.06   NOT      R      7x600s   0.8"   ~24.6
  "   2.09   DK1.5m   R    10x1200s   1.3"   ~24.5
  "   2.24   DK1.5m   V     6x1200s   1.4"   ~24.7
Sept. 3.13   NOT      R      7x600s   1.1"   ~24.3
  "   3.15   DK1.5m   R     8x1200s   1.2"   ~24.5
Sept. 4.09   DK1.5m   R     5x1200s   1.5"   ~23.6

The NOT images covered the central 70%, and the DK1.5-m images,
about 95% of the error box. The photometric calibration in
VRI-bands is based on the photometry reported by Henden (GCN #785Not found
 
 
).
Comparison of the images reveal no significantly variable object
down to R=24.5 (3 sigma).".