GRB 120422A: i-band re-brightening and possible SN detection
ATel #4082; D. Malesani (DARK/NBI), S. Schulze (Univ. Iceland), T. Kruehler (DARK/NBI), G. Leloudas (OKC/Stockholm and DARK/NBI), A. de Ugarte Postigo (IAA/CSIC and DARK/NBI), D. Xu (WIS), J. P. U. Fynbo, J. Hjorth (DARK/NBI), P. Jakobsson (Univ. Iceland), R. Kotak, D. Wright (Queens University Belfast), G. Barisevicius, S. Geier (NOT), report on behalf of a larger collaboration
on 30 Apr 2012; 23:58 UT
Credential Certification: Giorgos Leloudas (giorgos@dark-cosmology.dk)
Subjects: Optical, Gamma-Ray Burst, Supernovae, Transient
We have used the NOT equipped with ALFOSC to monitor the optical counterpart of GRB 120422A (Troja et al., GCN 13243; Cucchiara et al., GCN 13245) at z=0.283 (Tanvir et al., GCN 13251; Schulze et al., GCN 13257).
The source brightened by 0.80 +- 0.15 mag between Apr. 25.86 UT and Apr. 30.90 UT (3.56 and 8.60 days after the GRB, respectively). On Apr. 25.86 UT the counterpart had i ~ 22.10, calibrated against stars from the SDSS catalogue. This is consistent with the measurement by Perley et al. (GCN 13267) at a similar epoch. On Apr. 30.90 UT, we measure i = 21.30 +/- 0.15.
We suggest this re-brightening to be due to the emerging supernova.
(Note: this telegram was also posted as GCN 13275)
