GCN Circular 27348
Subject
GRB 200306C: Calar Alto 2.2m upper limit
Event
Date
2020-03-08T07:43:45Z (7 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC,
DARK/NBI), M. Blazek, C. C. Thoene, J. F. Agui Fernandez (all
HETH/IAA-CSIC), R. Pedro Hedrosa, and E. Gallego (both CAHA) report:
We observed the field of the afterglow of GRB 200306C (Lipunov et al.,
GCNs #27324, #27325; Gropp et al., GCN #27326; Jelinek et al., GCN
#27328; Hu et al., GCN #27329; Moskvitin, GCN #27333; Izzo &
Perley, GCN #27334; Kann et al., GCN #27335; Steele et al., GCN #27338)
with the 2.2m telescope of Calar Alto equipped with CAFOS. We obtained 4
x 720 s images in the Rc band under adverse conditions (moonlight,
passing clouds, bright star still there).
Our stacked image centred at mean epoch 1.25519 d after the GRB shows no
detection to a 3-sigma upper limit of Rc > 23.0 mag (AB). The magnitude
limit was obtained versus SDSS stars in the field.