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J/ApJ/846/34   Flaring gamma-ray sources; LAT 7.4yr (2FAV)   (Abdollahi+, 2017)

The second catalog of flaring gamma-ray sources from the Fermi All-sky Variability Analysis. Abdollahi S., Ackermann M., Ajello M., Albert A., Baldini L., Ballet J., Barbiellini G., Bastieri D., Becerra Gonzalez J., Bellazzini R., Bissaldi E., Blandford R.D., Bloom E.D., Bonino R., Bottacini E., Bregeon J., Bruel P., Buehler R., Buson S., Cameron R.A., Caragiulo M., Caraveo P.A., Cavazzuti E., Cecchi C., Chekhtman A., Cheung C.C., Chiaro G., Ciprini S., Conrad J., Costantin D., Costanza F., Cutini S., D'Ammando F., de Palma F., Desai A., Desiante R., Digel S.W., Di Lalla N., Di Mauro M., Di Venere L., Donaggio B., Drell P.S., Favuzzi C., Fegan S.J., Ferrara E.C., Focke W.B., Franckowiak A., Fukazawa Y., Funk S., Fusco P., Gargano F., Gasparrini D., Giglietto N., Giomi M., Giordano F., Giroletti M., Glanzman T., Green D., Grenier I.A., Grove J.E., Guillemot L., Guiriec S., Hays E., Horan D., Jogler T., Johannesson G., Johnson A.S., Kocevski D., Kuss M., La Mura G., Larsson S., Latronico L., Li J., Longo F., Loparco F., Lovellette M.N., Lubrano P., Magill J.D., Maldera S., Manfreda A., Mayer M., Mazziotta M.N., Michelson P.F., Mitthumsiri W., Mizuno T., Monzani M.E., Morselli A., Moskalenko I.V., Negro M., Nuss E., Ohsugi T., Omodei N., Orienti M., Orlando E., Paliya V.S., Paneque D., Perkins J.S., Persic M., Pesce-Rollins M., Petrosian V., Piron F., Porter T.A., Principe G., Raino S., Rando R., Razzano M., Razzaque S., Reimer A., Reimer O., Sgro C., Simone D., Siskind E.J., Spada F., Spandre G., Spinelli P., Stawarz L., Suson D.J., Takahashi M., Tanaka K., Thayer J.B., Thompson D.J., Torres D.F., Torresi E., Tosti G., Troja E., Vianello G., Wood K.S. <Astrophys. J., 846, 34 (2017)> =2017ApJ...846...34A
ADC_Keywords: Gamma rays ; Active gal. nuclei ; BL Lac objects ; QSOs ; Cross identifications Keywords: astroparticle physics; catalogs; galaxies: active; gamma rays: general; techniques: photometric Abstract: We present the second catalog of flaring gamma-ray sources (2FAV) detected with the Fermi All-sky Variability Analysis (FAVA), a tool that blindly searches for transients over the entire sky observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. With respect to the first FAVA catalog, this catalog benefits from a larger data set, the latest LAT data release (Pass 8), as well as from an improved analysis that includes likelihood techniques for a more precise localization of the transients. Applying this analysis to the first 7.4 years of Fermi observations, and in two separate energy bands 0.1-0.8GeV and 0.8-300GeV, a total of 4547 flares were detected with significance greater than 6σ (before trials), on the timescale of one week. Through spatial clustering of these flares, 518 variable gamma-ray sources were identified. Based on positional coincidence, likely counterparts have been found for 441 sources, mostly among the blazar class of active galactic nuclei. For 77 2FAV sources, no likely gamma-ray counterpart has been found. For each source in the catalog, we provide the time, location, and spectrum of each flaring episode. Studying the spectra of the flares, we observe a harder-when-brighter behavior for flares associated with blazars, with the exception of BL Lac flares detected in the low-energy band. The photon indexes of the flares are never significantly smaller than 1.5. For a leptonic model, and under the assumption of isotropy, this limit suggests that the spectrum of freshly accelerated electrons is never harder than p∼2. Description: To build the second catalog of flaring gamma-ray sources (2FAV) catalog, we apply the Fermi All-sky Variability Analysis (FAVA; Ackermann+ 2013, J/ApJ/771/57) to the first 387 weeks of Fermi observations, from Mission Elapsed Time (MET) 239557418 to 473615018, or Modified Julian Date (MJD) from 54682 (2008 August 4) to 57391 (2016 January 4). In this time range, a total of 7106 seed flares were found, roughly 18 per week. As for the previous catalog, FAVA uses weekly time bins. Two independent energy bands are used, 0.1-0.8GeV and 0.8-300GeV, to enhance the sensitivity to spectrally soft and hard flares, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 116 518 List of the second catalog of flaring gamma-ray sources (2FAV) sources table4.dat 64 6 List of 2FAV sources that have been associated with 2FGL sources and the possible 3FGL counterpart of the associations
See also: VII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015) J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999) J/AJ/133/2487 : VERA 22GHz Fringe Search Survey (Petrov+, 2007) J/A+A/506/1563 : First AGILE catalog of gamma-ray sources (Pittori+, 2009) J/ApJ/718/587 : The Fermi-AT20G catalog (Mahony+, 2010) J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010) J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010) J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012) J/ApJ/771/57 : FAVA Fermi-LAT flaring gamma-ray sources (Ackermann+, 2013) J/MNRAS/441/1899 : Fermi bright blazars (Fuhrmann+, 2014) J/A+A/558/A137 : AGILE bright gamma-ray sources (Verrecchia+, 2013) J/ApJS/217/2 : Refined associations of Fermi/LAT sources (Massaro+, 2015) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) J/ApJ/810/14 : Third catalog of LAT-detected AGNs (3LAC) (Ackermann+, 2015) J/ApJ/838/139 : Radio follow-up on 3FGL unassociated sources (Schinzel+, 2017) : 2FAV home page : Online interactive FAVA catalog Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- 2FAV FAVA identification (JHHMM+DD.d) 11 A1 --- f_2FAV [f] f: sources localized solely by the photometric FAVA analysis 13- 18 F6.2 deg RAdeg Right Ascension of Source (J2000) 20- 25 F6.2 deg DEdeg Declination of Source (J2000) 27- 32 F6.2 deg GLON Galactic Longitude of Source (J2000) 34- 39 F6.2 deg GLAT Galactic Latitude of Source (J2000) 41- 44 F4.2 deg r95 [0.04/1.8] Statistical error on the source position at 95% confidence level 46- 48 I3 --- Nf [1/301] Total number of flares 50- 51 I2 --- Nhe [0/83] Number of high-energy flares 53- 55 I3 --- Nneg [0/235] Number of negative flares 57- 60 F4.2 deg Rs [0.1/2.3] Search radius used in the association procedure 62- 79 A18 --- GAssoc Counterpart found in the gamma-ray catalogs 80 A1 --- f_GAssoc [*] *: no significant weekly variability was detected for the source in the 1FGL, 2FGL, or 3FGL catalogs 82-105 A24 --- Assoc Counterpart at other wavelengths 107-111 A5 --- Class Class of the counterpart (1) 113-116 I4 --- ATel ? ATel number for Fermi-LAT flare alerts
Note (1): Class of the counterpart (Table 3) as follows: pwn = Pulsar wind nebula (1 occurrence); psr = Pulsar (1 occurrence); agn = Non-blazar active galaxy (2 occurrences); hmb = High-mass binary (3 occurrences); rdg = Radio galaxy (3 occurrences); nlsy1 = Narrow line Seyfert 1 (3 occurrences); nov = Nova (5 occurrences); grb = Gamma-ray burst (14 occurrences); bcu = Blazar candidate of uncertain type (67 occurrences); bll = BL Lac (73 occcurrences); fsrq = FSRQ (253 occurrences); Blank for unassociated sources and unknown classes (93 occurrences).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 10 A10 --- 2FAV Source identifier 12- 15 F4.2 deg Rs [0.1/0.5] Search radius used in the association procedure 17- 28 A12 --- 2FGL 2FGL counterpart (JHHMM.m+DDMM) 30- 33 F4.2 deg 2Sep [0.02/0.2] 2FGL distance from the 2FAV source 35- 40 F6.2 --- 2Var [15.3/121.3] 2FGL variability index 42- 53 A12 --- 3FGL 3FGL counterpart (JHHMM.m+DDMM) 55- 58 F4.2 deg 3Sep [0.02/0.2]? 3FGL distance from the 2FAV source 60- 64 F5.2 --- 3Var [56.6/66.6]? 3FGL variability index
History: From electronic version of the journal References: Ackermann et al. 2013ApJ...771...57A Cat. J/ApJ/771/57
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Apr-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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