[vsnet-grb-info 311] GRB 020715, optical observations

[GCN Circulars <gcncirc@lheawww.gsfc.nasa.gov>]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1467
SUBJECT: GRB 020715, optical observations
DATE:    02/08/12 12:02:08 GMT
FROM:    Javier Gorosabel at LAEFF-INTA, Madrid  <jgu@laeff.esa.es>

 J. Gorosabel (IAA-CSIC), J.M. Castro Cerón (ROA),
 A.J. Castro Tirado (IAA-CSIC), A. Guijarro (CAHA),
 F. Hoyo (CAHA), S. Pedraz (CAHA) and C. Wolf (Oxford Univ.),
 report:

 We have performed Ic-band observations of the central part
 (coverage 40%) of the GRB 020715 (GCN 1456) error box with
 the 2.2m Telescope of Calar Alto (+BUSCA) as follows:

 ========================================================
 Date             Seeing  Exp.Time   Lim.Mag.  Time Since
 (2002 UT)         (")      (s)     (3 sigma)  GRB (days)
 --------------------------------------------------------
 17.945-18.007/07  1.2     5x900      24.4        2.2      
 18.872-18.947/07  1.0     6x900      24.7        3.1      
 05.864-05.931/08  1.5     6x900      24.3       21.1      
 --------------------------------------------------------

 Marginal variability (< 0.2 mag) is detected for 3 sources.
 None of these objects shows flux variability consistent with
 a monotonic decay, as expected for an optical afterglow 
 2.2-21.1 days after the gamma ray event.

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp