DRAFT
2019-09-04 10:29:07
Type: Object/s-Discovery/Classification
Bibcode: 2019TNSAN..86....1B
GRB190829A: GROND detection of the accompanying SN
Authors: J. Bolmer (MPE), J. Greiner (MPE), T.-W. Chen (MPE) and S. Klose (TLS Tautenburg) report
Keywords: Gamma-Ray Burst, Supernova, Photometry, Optical, Transient
Abstract:
GROND found a relativley sharp rise in all seven GROND bands (e.g. about 0.5 mag in z' to 19.55 +/- 0.03 mag) between 4.5 and 5.5 days after the BAT trigger. This behavior can be interpreted as the  upcoming supernova component.

We have been using GROND (Greiner et al. 2008, PASP 120, 405) to follow up the
afterglow of GRB 190829A (Dichiara et al., GCN 25552) at z=0.08 (Valeev et al.,
GCN 25565). The light of the optical transient has been fading in all GROND bands during the first 
days, was then flattening and is now finally showing a relativley sharp rise in all seven
GROND bands (e.g. about 0.5 mag in z' to 19.55 +/- 0.03 mag in the AB system; 330s integration
time) between 4.5 and 5.5 days after the BAT trigger. This behavior can be interpreted as the 
upcoming supernova component.

Further spectroscopic follow up is encouraged.

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