Astronomy Twitter Journal Club: Relativistic shock breakouts

Transcript from the fourth meeting of the Astronomy Twitter Journal Club. The paper under discussion can be found at and was suggested by @partialobs
astrojournalclub @astronomyjc

Hi everyone & welcome to the 4th meeting of #astrojc. We're going to discuss 'Relativistic shock breakouts–a variety of gamma ray flares'.

08/07/2011 02:10:32 WIB
astrojournalclub @astronomyjc

(well that's the plan if there's any of you around to do so!) #astrojc

08/07/2011 02:10:58 WIB
Kash Farooq @kashfarooq

@_atjc I'm here. Anyone else? @partialobs suggested the paper. Are you here Derek?! #astrojc

08/07/2011 02:13:41 WIB
Dr Matt Burleigh @Matt_Burleigh

@astronomyjc 'fraid I'm observing in la Palma now, so cant join in, only read comments Have a couple of papers I might suggest soon #astrojc

08/07/2011 02:18:21 WIB
astrojournalclub @astronomyjc

Lunchtime discussion today was tangentially related to this paper - it was all about how life could be wiped out by gamma-rays #astroJC

08/07/2011 02:25:53 WIB
Derek Fox @partialobs

@astrojc Sorry to be late. Great thing about this paper is that it explains multiple mysyeries as aspects of a single phenom. #astrojc

08/07/2011 02:26:23 WIB
Dr Leon Baruah @crashtronomy

(1/2) Well, the paper for this week's #astroJC is a bit on the long side, and it's kind of lacking in application. I'd love to see...

08/07/2011 02:27:46 WIB
Derek Fox @partialobs

@astrojc First, one of the great mysteries of GRBs, what explains the g-ray emission of SN 1998bw? #astrojc

08/07/2011 02:28:36 WIB
Dr Leon Baruah @crashtronomy

(2/2) and actual gamma ray time plot against an equivalent optical light curve to actually get a feel for it. #astrojc

08/07/2011 02:29:10 WIB
Derek Fox @partialobs

@astrojc The g-ray luminosity of 1998bw was 1e-4 times that of the z~1 GRBs. So this paper explains as shock breakout - not a jet. #astrojc

08/07/2011 02:31:09 WIB
Kash Farooq @kashfarooq

@LeonBaloo Good point. Lots of mention of light curves but non included that demonstrated their model vs. observations. #astrojc

08/07/2011 02:31:20 WIB
astrojournalclub @astronomyjc

@partialobs So, are you convinced that these relativistic shocks are a good explanation for all these mysterious observations? #astroJC

08/07/2011 02:31:37 WIB
Arie Nouwen @AdrianusV

Hi folks, I just popped in. Had a busy day, no time for reading the paper. But I enjoy following the discussion. #astrojc

08/07/2011 02:32:41 WIB
Kash Farooq @kashfarooq

@_atjc They do appear to be focusing on the Low luminosity GRBs. It is the biggest part in section 5 #astrojc

08/07/2011 02:33:32 WIB
Derek Fox @partialobs

@astronomyjc In fact, it turns out that all "low-luminosity" GRBs from z<~0.3 exhibit shock-breakout according to model predictions #astrojc

08/07/2011 02:33:45 WIB
astrojournalclub @astronomyjc

I'm curious - how many people follow these discussions but never say anything? Say hello if you're lurking! #astroJC

08/07/2011 02:34:28 WIB
Brooke Simmons @vrooje

@_atjc Oops; I'm late; but it's a moot point anyway. Been such a crazy week that I haven't read the paper. +not a shock expert #astroJC

08/07/2011 02:35:24 WIB
Derek Fox @partialobs

@astronomyjc Apart from SN1998bw: GRB 031203, GRB 060218, GRB 100316D... plus as a bonus, SN 2008x #astrojc

08/07/2011 02:35:29 WIB
Derek Fox @partialobs

@astronomyjc GRB 031203: z~0.1 discovered in gamma-rays, but with a peculiar signature of bright contemporaneous X-ray emission #astrojc

08/07/2011 02:36:25 WIB
Derek Fox @partialobs

@astronomyjc I wrote a paper about the peculiar X-ray emission... couldn't figure it out... now we know it's shock breakout. #astrojc

08/07/2011 02:37:00 WIB
Derek Fox @partialobs

@astronomyjc GRB 060218: Great early hit of the Swift mission, low-z GRB-supernova, but the "gamma-ray burst" was very peculiar #astrojc

08/07/2011 02:37:34 WIB
Derek Fox @partialobs

@astronomyjc GRB 060218 cont'd: Interpreted as shock breakout at the time, so not new, but bolstered by comprehensive theory #astrojc

08/07/2011 02:38:46 WIB
Arie Nouwen @AdrianusV

Gamma rays, GRB's: is there an exact definition of terms? I mean, a gammaray-source like pulsar PSR B1259-63 isn't a classical GRB. #astrojc

08/07/2011 02:38:58 WIB
Derek Fox @partialobs

@astronomyjc SN 2008x: A supernova caught "in the act" by the Swift *X-ray telescope* (focusing instrument, narrow FOV) #astrojc

08/07/2011 02:39:18 WIB
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