2014ApJ...781...19B

Query : 2014ApJ...781...19B

2014ApJ...781...19B - Astrophys. J., 781, 19 (2014/January-3)

The AGILE alert system for gamma-ray transients.

BULGARELLI A., TRIFOGLIO M., GIANOTTI F., TAVANI M., PARMIGGIANI N., FIORETTI V., CHEN A.W., VERCELLONE S., PITTORI C., VERRECCHIA F., LUCARELLI F., SANTOLAMAZZA P., FANARI G., GIOMMI P., BENEVENTANO D., ARGAN A., TROIS A., SCALISE E., LONGO F., PELLIZZONI A., PUCELLA G., COLAFRANCESCO S., CONFORTI V., TEMPESTA P., CERONE M., SABATINI P., ANNONI G., VALENTINI G. and SALOTTI L.

Abstract (from CDS):

In recent years, a new generation of space missions has offered great opportunities for discovery in high-energy astrophysics. In this article we focus on the scientific operations of the Gamma-Ray Imaging Detector (GRID) on board the AGILE space mission. AGILE-GRID, sensitive in the energy range of 30 MeV-30 GeV, has detected many γ-ray transients of both galactic and extragalactic origin. This work presents the AGILE innovative approach to fast γ-ray transient detection, which is a challenging task and a crucial part of the AGILE scientific program. The goals are to describe (1) the AGILE Gamma-Ray Alert System, (2) a new algorithm for blind search identification of transients within a short processing time, (3) the AGILE procedure for γ-ray transient alert management, and (4) the likelihood of ratio tests that are necessary to evaluate the post-trial statistical significance of the results. Special algorithms and an optimized sequence of tasks are necessary to reach our goal. Data are automatically analyzed at every orbital downlink by an alert pipeline operating on different timescales. As proper flux thresholds are exceeded, alerts are automatically generated and sent as SMS messages to cellular telephones, via e-mail, and via push notifications from an application for smartphones and tablets. These alerts are crosschecked with the results of two pipelines, and a manual analysis is performed. Being a small scientific-class mission, AGILE is characterized by optimization of both scientific analysis and ground-segment resources. The system is capable of generating alerts within two to three hours of a data downlink, an unprecedented reaction time in γ-ray astrophysics.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: general - instrumentation: detectors - methods: data analysis - methods: observational - methods: statistical

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 AGL J0109+6134 gam 01 09.0 +61 34           ~ 1 0
2 AGL J0229+2054 gam 02 29 00.0 +20 54 00           ~ 3 0
3 QSO J0403-3605 Bla 04 03 53.74990003 -36 05 01.9131880   17.04 17.17 16.67   ~ 285 1
4 M 1 SNR 05 34 30.9 +22 00 53           ~ 6193 1
5 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 884 2
6 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1301 1
7 AGL J0813+2420 gam 08 13.0 +24 20           ~ 2 0
8 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2316 1
9 AGL J0906-1241 gam 09 06 -12.7           ~ 2 0
10 ICRF J094857.3+002225 Sy1 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 318 2
11 AGL J1023-3738 gam 10 23.0 -37 38           ~ 2 0
12 AGL J1037-5708 ev 10 37.0 -57 08           ~ 7 0
13 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2675 1
14 ICRF J112758.8+362028 Sy1 11 27 58.87083269 +36 20 28.3514025   20.86 20.52 20.05   ~ 77 1
15 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 874 1
16 ICRF J122454.4+212246 Sy1 12 24 54.4583146056 +21 22 46.385507388   17.56 17.50 18.2   ~ 704 2
17 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5802 1
18 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 793 0
19 PSR J1410-6132 Psr 14 10 24.000 -61 32 00.00           ~ 128 1
20 SNR G312.4-00.4 SNR 14 13 00 -61 44.0           ~ 92 1
21 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1316 1
22 AGL J1524+3642 gam 15 24.0 +36 42           ~ 1 0
23 4C 38.41 QSO 16 35 15.49297809 +38 08 04.5005995   18.14 17.97 17.25   ~ 858 1
24 AGL J1647+5107 gam 16 47.0 +51 07           ~ 2 0
25 MAXI J1659-152 LXB 16 59 01.680 -15 15 28.73           ~ 251 0
26 AGL J1734-3310 gam 17 34 44.0 -33 10 38           ~ 16 1
27 7C 1749+7006 BLL 17 48 32.8402992264 +70 05 50.768819304   17.46 17.01 15.48   ~ 429 1
28 3FGL J1824.4+4310 BLL 18 24 19.0 +43 09 50           ~ 38 0
29 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 671 1
30 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4337 0
31 AGL J2021+4029 gam 20 21.9 +40 30           ~ 6 1
32 AGL J2030+4043 gam 20 30.0 +40 43           ~ 2 0
33 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1939 2
34 AGL J2103+5630 gam 21 03 +56.5           ~ 4 0
35 QSO J2147-7536 QSO 21 47 12.73063669 -75 36 13.2249063   17.79 17.30     ~ 147 1
36 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2259 1
37 AGL J2206+6203 gam 22 06 49.17 +62 03 45.2           ~ 3 0
38 QSO B2233-148 BLL 22 36 34.08715104 -14 33 22.1896043 19.53 19.13 18.66 18.05   ~ 153 1
39 HD 215227 HXB 22 42 57.3031579265 +44 43 18.259103226 8.07 8.84 8.78     B1.5-2III 130 0
40 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2848 2
41 AGL J2302-3251 gam 23 01.5 -32 51           ~ 3 0
42 QSO B2326-502 QSO 23 29 20.8816086312 -49 55 40.657964772   19.0 19.0 20.86   ~ 100 1

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