GRB 991217
GCN Circular 502
Subject
GRB 991217 (SAX J2303.2+0015) Optical observations
Date
1999-12-20T13:18:19Z (27 years ago)
From
Javier Gorosabel at LAEFF-INTA, Madrid <jgu@laeff.esa.es>
Vijay Mohan, Ram Sagar, Anil K. Pandey, S.B. Pandey (from UPSO,
Nainital), Javier Gorosabel and Alberto J. Castro-Tirado (LAEFF-INTA,
Madrid and IAA-CSIC, Granada) -on behalf of a larger European
collaboration- report:
"We have obtained several images of the BeppoSAX WFC error box for SAX
J2303.2+0015 (also referred to as GRB 991217) as reported by Muller,
et. al. (GCN 474) with the 2k x 2k CCD camera mounted at the f/13 Cass
focus of the UPSO 104-cm Sampurnanand telescope on 1999 Dec 17.63, Dec
18.65 and Dec 19.55 in R photometric passband during photometric sky
conditions. The corresponding exposure times are 120, 60 and 60 minutes
respectively. Our field of view was 780 x 780 arc seconds. After a visual
comparison of our images with digital sky survey, though we detect several
faint objects yet no object varying like an OT of a gamma-ray burst was
detected. Our images go as faint as R = 22.0 magnitude. This indicates that
the OT of this GRB if any is fainter than 22nd magnitude in R.
This message is citable.
GCN Circular 501
Subject
GRB991217/SAX J2303.2+0015, optical observations
Date
1999-12-20T09:49:49Z (27 years ago)
From
Nicola Masetti at ITeSRE,CNR,Bologna <masetti@tesre.bo.cnr.it>
C. Bartolini, A. Guarnieri, A. Piccioni (Dip. Astronomia, U. of Bologna),
A. De Blasi (Oss. Astron. Bologna) and N. Masetti (ITeSRE-CNR, Bologna)
report:
"Five R-band images of the BeppoSAX WFC error box of GRB991217/SAX
J2303.2+0015 (Muller et al. 1999, GCN #474) were obtained with the
Bologna Astronomical Observatory 1.5-meter telescope equipped with BFOSC
between Dec. 17.727 and 17.814, for a total exposure time of 55 min.
These observations, which started about 13 hours after the high-energy
event, were summed together and compared with the DSS-2.
Altought somewhat deeper than the DSS-2, the summed R frame does not show
any remarkable new object."
This message can be cited.
GCN Circular 490
Subject
GRB 991217 (SAX J2303.2+0015) Optical observations
Date
1999-12-18T17:46:18Z (27 years ago)
From
Arne A. Henden at USNO/USRA <aah@nofs.navy.mil>
A. Henden (USRA/USNO), F. Vrba, H. Harris, C. Luginbuhl,
B. Canzian, J. Munn, S. Levine, H. Guetter (USNO), D. H.
Hartmann (Clemson Univ.), M.C. Jennings (IGPP, UCR visitor),
J. A. Smith (U. Mich.) report:
We have imaged the BeppoSAX WFC error box for
SAX J2303.2+0015 (also referred to as GRB 991217) as
reported by Muller, et. al. (GCN 474). Both the 1.0-m
and 1.3-m (wide field) telescopes were used, with
V and R exposures.
Conditions were marginal; light to moderate cirrus
illuminated by the moon prevented individual images
from going deeper than the DSS/POSS-II image. However,
at that limit, we see no new object within the SAX
4.5 arcmin error box.
GCN Circular 482
Subject
GRB 991217
Date
1999-12-18T01:50:10Z (27 years ago)
From
Arne A. Henden at USNO/USRA <aah@nofs.navy.mil>
A. Henden (USRA/USNO) reports that there is an asteroid
currently moving through the SAX error box, about two arcmin
south of the center, in an easterly direction. Short exposures
might confuse the naive observer into thinking a new object
is present.