[vsnet-grb-info 9055] Emerging Supernova in the Afterglow of GRB 100316D

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10543
SUBJECT: Emerging Supernova in the Afterglow of GRB 100316D
DATE:    10/03/24 13:37:52 GMT
FROM:    Filomena Bufano at INAF-Osb Astro di Padova  <filomena.bufano at oapd.inaf.it>

Thank you very much,
Filomena Bufano

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F. Bufano, S. Benetti, E. Cappellaro, INAF Osservatorio Astronomico di  
Padova (INAF-OAPd); S. Covino, INAF Osservatorio Astronomico di Brera  
(INAF-OABr); S. Vergani, P.Goldoni, GEPI (Observatoire de Paris) - APC  
(Université Paris 7); M. Della Valle, INAF Osservatorio di  
Capodimonte; E. Pian, INAF Osservatorio Astronomico di Trieste; S.  
Campana, G.Tagliaferri, INAF-OABr; D.Malesani, J. Fynbo, Dark  
Cosmology Centre; M. Turatto, INAF Osservatorio Astronomico di  
Catania; F.Patat, European Southern Observatory (ESO) and P. Mazzali,  
INAF-OAPd  report that a high-dispersion optical spectrum (range  
350-900 nm, resolution 0.02 nm) of the afterglow associated to GRB  
100316D (cf. GCN 10496) was obtained with the VLT telescope  
(+XShooter) at ESO-Paranal on March 23.04 UT. The spectrum of  the  
source located at R.A.=07:10:31.8 and Decl.=-56:15:20.2, J2000.0 (as  
measured on the XShooter acquisition image) shows very broad bumps   
with peaks measured at about 430nm and 670nm reminiscent of an  
emerging broad line type Ic supernova. Indeed, above 600 nm the  
spectrum of this source shows some similarities with that of SN 1998bw  
(Patat et al. 2001, ApJ, 555, 900) taken 7 days after outburst.

There are however major differences  with the spectrum of this  
transient, showing a significant  flux deficiency in the range  
450-550nm in comparison with SN 1998bw .









__________________________________________________________________

Filomena Milena Bufano
INAF- Osservatorio Astronomico di Padova
Vicolo dell'Osservatorio, 5  PADOVA I-35122
tel. +39-0498293439   FAX. +39-0498759840
filomena.bufano at oapd.inaf.it