TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  524
SUBJECT: GRB 000115 Optical observations
DATE:    00/01/26 23:59:43 GMT
FROM:    Brian Lindgren Jensen at U.of Copenhagen  <brian_j@astro.ku.dk>

B. L. Jensen, J. Hjorth, J. Pritchard, H. Pedersen (U. of Copenhagen)
N. Masetti, E. Palazzi (ITeSRE-CNR, Bologna)
J. Gorosabel (LAEFF-INTA, Madrid)
A. J. Castro-Tirado (LAEFF-INTA, Madrid and IAA-CSIC, Granada)
M. Salvato (AIP, Potsdam)
C. Kouveliotou (USRA, at NASA/MSFC Huntsville)
E. Rola, L. Kaper (U. of Amsterdam)
M. R. Zapatero-Osorio and  A. Rosenberg (IAC, Tenerife)

report on behalf of a larger European collaboration:

"We have obtained images of the RXTE/IPN error box of GRB 000115
(Marshall et al. GCN #519; Hurley et al. GCN #520), with the
CTIO 0.9m telescope, the ESO Danish 1.5m telescope (+DFOSC),
the 1.23m CAHA telescope and the 0.82m IAC telescope, in BVR
between Jan 17.127 and Jan 21.382, as follows:

Telescope, Filter, Exp., Date,                     Seeing, Lim_mag.
===================================================================
1.5DK         R   6x300s (2000 Jan 17.127-17.155 UT), 1.8"  22.3
1.5DK         R   6x300s (2000 Jan 17.329-17.357 UT), 1.7"  22.5

CTIO          R   3x600s (2000 Jan 17.093-17.115 UT), 1.6"  21.5
CTIO          R   3x600s (2000 Jan 17.243-17.265 UT), 1.6"  21.6

1.23-CAHA     B     900s (2000 Jan 17.956-17.967 UT), 2.2"  21.1
1.23-CAHA     R   2x450s (2000 Jan 17.941-17.954 UT), 2.0"  22.5

IAC80         R   4x900s (2000 Jan 18.050-18.083 UT), 2.4"  21.2
IAC80         R   4x900s (2000 Jan 18.096-18.129 UT), 2.4"  21.2

1.23-CAHA     V     600s (2000 Jan 18.065-18.073 UT), 2.2"  22.0
1.23-CAHA     B    1200s (2000 Jan 18.953-18.967 UT), 2.3"  21.4

1.23-CAHA     B    1800s (2000 Jan 19.946-19.967 UT), 3.6"  20.5

1.5DK         R   8x300s (2000 Jan 21.344-21.382 UT), 2.0"  22.0

No optical afterglow candidate is evident from analyzing these
data, nor from comparison with DSS. We found no object down to
R~22.0 (B~20.5) (USNO A2.0-based calibration) to show variation of more
than R=0.3 (B=0.3) mag during the period observed."