GCN Circular 982
Subject
GRB 010222 BV optical observations
Event
Date
2001-02-23T22:13:54Z (25 years ago)
From
Corrado Bartolini at Universita di Bologna <bartolini@bo.astro.it>
C. Bartolini, A. Guarnieri, A. Piccioni (Dip. Astronomia, Univ. of Bologna),
S. Bernabei (Astron. Obs., Bologna) and G. Pupillo (ISAO, CNR, Bologna)
report:
"We have imaged the proposed optical counterpart (GCN #961) of GRB010222
(GCN #959, 960) on February 23 in the B and V bands with the 152 cm
Loiano telescope (plus EEV CCD) of the Observatory of Bologna.
The seeing was 4 arcseconds. The preliminary magnitudes are given with respect
to the comparison star "A" (GCN 963) = USNO 1275-08542334.
mean UT Filter exptime delta_mag
(s)
23.174 B 2400 2.04 +/- 0.07
23.199 V 1800 2.69 +/- 0.09
Thus assuming for the star "A" B=17.60, then the OT had B = 19.64 +/- 0.07".