GRB observeret med iTelescope.net

[BjarneModerator Super Nova]

Personer med tilknytning til Warkauden Kassiopeia:
http://www.kassiopeia.net/
rapporterer observationer af en ny klar GRB (gammaglimt) med observatoriet T11 på
http://www.itelescope.net/
netværket af observatorier. De rapporterer her observationerne

TITLE:   GCN CIRCULAR

	NUMBER:  14457

	SUBJECT: GRB 130427A: iTelescope T11 optical observations

	DATE:    13/04/27 12:26:03 GMT

	FROM:    Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen@kassiopeia.net>

	

	Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill

	Observatory, Varkaus, Finland) report:

	

	We have detected GRB 130427A optical afterglow at iTelescope 

	observatory T11 (Mayhill, New Mexico) 0.50-m/6.8 astrograph and FLI 

	ProLine PL11002M CCD. Three unfiltered and three photometric V filter 

	images with 120 sec exposure time were made.

	

	The afterglow was detected at following position RA 11:32:32.83

	and DEC +27:41:56.4

	

	The following magnitudes were obtained from the observations using

	NOMAD1 1176-0248446 (R=13.520, V=13.120) as the comparison:

	

	Tmid(sec)+T0   Filter         Exp. time    Mag          Mag err. 

	4597              unfiltered     120            15.02CR     0.04

	4743              unfiltered     120            15.09CR     0.05

	4887              unfiltered     120            15.11CR     0.05

	5438              V                120            14.89V       0.04

	5582              V                120            14.89V       0.04

	5726              V                120            14.86V       0.04

	

	

[BjarneModerator Super Nova]

Ny udvikling: Los Alamos National Laboratory detekterede

gammaglimtet GRB 130427A 50.2s før Swift rapporterede røntgenstrålingen!
R-magnituden var ca R = 7.4 (det betaler sig at være hurtig):
TITLE:   GCN CIRCULAR

	NUMBER:  14476

	SUBJECT: GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger

	DATE:    13/04/28 00:12:42 GMT

	FROM:    James Wren at LANL  <jwren@nis.lanl.gov>

	

	J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis,

	of Los Alamos National Laboratory report:

	

	Three RAPTOR full-sky persistent monitors at Maui, HI, and Los Alamos, NM,

	independently detected  bright optical emission at the location of the

	Swift trigger 554620 (Maselli, et al., GCN 14448).  Starting at 07:47:07.28

	UT (50.2 seconds before the Swift trigger) we detect a brightening counterpart

	which peaks at magnitude R~7.4.  After the peak, the source fades to below

	10th magnitude at approximately the Swift trigger time.  The unfiltered images

	from all three monitors are calibrated to the Tycho-2 V-band catalog.

Rødforskydningen er blevet målt af X-shooter på VLT til at være 
z=0.3399 ± 0.0002

TITLE:   GCN CIRCULAR

	NUMBER:  14491

	SUBJECT: GRB 130427A: VLT/X-shooter redshift confirmation

	DATE:    13/04/28 15:05:53 GMT

	FROM:    Hector Flores at Obs.de Paris,Meudon  <hector.flores@obspm.fr>

	

	GRB 130427A: VLT/X-shooter redshift confirmation

	

	H. Flores (Obs. de Paris), S. Covino (INAF), D. Xu, T. Kruehler,

	J. Fynbo, B. Milvang-Jensen(DARK/NBI), A. de Ugarte Postigo (IAA-CSIC,

	DARK/NBI), L. Kaper (UVA) and  K. Wiersema (U. Leicester) report on behalf

	of the X-shooter GRB collaboration:

	

	VLT/X-shooter observed the afterglow of GRB 130427A (Maselli et al.,

	GCN 14448; Elenin et al., GCN 14450), starting on 2013-04-28 at UT

	00:23. The observation consisted of 2x600s exposures.

	

	In the spectra we detect the continuum in the complete range from 3000

	to 24800 A. We find several absorption features including FeII, MnII,

	MgII, MgI, TiII, CaII, NaI, and emission lines such as H-alpha,

	H-beta,  [OIII], and [OII], all at a common redshift of z=0.3399 ± 0.0002,

	consistent with the measurement in Levan et al. (GCN 14455) and

	Xu et al. (GCN 14478).

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