Important Note
The initial draft (very bottom) was for flaring of two sources. The first one (1749+701) did have a recent ATEL #3171 so the new draft is only for the latter source (J0742+5444)
New draft just on flare of BZU J0742+5444
Fermi LAT detection of a GeV flare from BZU J0742+5444
Davide Donato (NASA/GSFC); on behalf of the Fermi Large Area Telescope Collaboration.
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed a bright gamma-ray flare from a source positionally consistent with the flat spectrum radio source, 87GB 073840.5+545138 = BZU J0742+5444 (RA: 07h42m39.8s, Dec: +54d44m25s, J2000, A. J. Beasley et al. 2002, ApJS, 141, 13) with z=0.72 (J. Halpern et al. 2003, AJ, 125, 572).
Preliminary analysis indicates that on February 26, 2011 the source was in a high state with a gamma-ray flux (E>100MeV) of (1.2+/-0.3) x 10^-6 ph cm^-2 s^-1 (error is statistical only). This value represents an increase of a factor of ~20 with respect to the flux in the 1FGL catalog (Abdo et al. 2010, ApJS, 188, 405), which reports the average flux from August 2008 through June 2009.
Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. The Fermi LAT contact person for this source is Davide Donato (donato@milkyway.gsfc.nasa.gov).
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
Initial draft on two sources... but 1749+701 was already recently reported (ATEL 3171)
Fermi LAT detection of GeV flares from HB89 1749+701 and BZU J0742+5444
Davide Donato (NASA/GSFC), Teddy Cheung (NRL); on behalf of the Fermi Large Area Telescope Collaboration.
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed bright gamma-ray flares from two sources positionally consistent with the flat spectrum radio quasars HB89 1749+701 (RA: 17h48m32.8s, Dec: +70d05m51s, J2000, K.J. Johnston et al. 1995, AJ, 110, 880; z=0.77, P. A. Hughes et al. 1992, ApJ, 396, 469H) and BZU J0742+5444 (RA: 07h42m39.8s, Dec: +54d44m25s, J2000, A. J. Beasley et al. 2002, ApJS, 141, 13B; z=0.72, B. Punsly 1999, ApJ, 51, 141P).
Preliminary analysis indicates that on February 26, 2011 the two sources were in a high state with a gamma-ray flux (E>100MeV) of (1.3+/-0.2) x 10^-6 ph cm^-2 s^-1 and (1.2+/-0.3) x 10^-6 ph cm^-2 s^-1 (errors are statistical only), respectively. Those values represent an increase of a factor of ~50 and ~20 with respect to the source flux level reported in the 1FGL catalog (Abdo et al. 2010, ApJS, 188, 405), which reports the average flux from August 2008 through June 2009.
Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. The Fermi LAT contact people for this source is Davide Donato (donato@milkyway.gsfc.nasa.gov).
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
5 Comments
Seth Digel
The draft is clear and to-the-point. Here are some minor comments for your consideration
NRL -> [Teddy might need to list his affiliation differently - I know that the rules for how to do that at NRL changed recently, but I don't recall what the new formulation is]
469H -> 469
141P -> 141
Singular to plural:
were in a high state -> were in high states
with a gamma-ray flux -> with gamma-ray fluxes
of a factor -> by factors of
source flux level -> fluxes
the average flux -> average fluxes
C. C. Teddy Cheung
Seth -
I took myself off as co-author. I took out the letters from page numbers. The other comments applied to converting the normal template to two sources but now the ATEL is for one object so no longer apply.
C. C. Teddy Cheung
The Punsly reference for the redshift is a secondary reference. The primary ref is an IAUC for Halpern & Eracleous. The published ref is Halpern et al. 2003 and I've inserted that.
The BZU designation means this is an unclassified radio source so I changed "flat spectrum radio quasar" to "flat spectrum radio source".
This gamma-ray source was discussed in the EGRET days in Mukherjee et al. 1995 and they called the radio source by the 87GB name....I inserted the 87GB 073840.5+545138 name.
Julie McEnery
In listing the contact person, you should change people to person (because you are listing a single person).
David J. Thompson
Minor wording comment:
(errors is statistical only) -> (error is statistical only) or (error statistical only)
value represent -> value represents