J/ApJS/101/259 The second EGRET catalog (Thompson+ 1995)
The second EGRET catalog of high-energy gamma-ray sources
Thompson D.J., Bertsch D.L., Dingus B.L., Esposito J.A., Etienne A.,
Fichtel C.E., Friedlander D.P., Hartman R.C., Hunter S.D.,
Kendig D.J., Mattox J.R., McDonald L.M., von Montigny C.,
Mukherjee R., Ramanamurthy P.V., Sreekumar P., Fierro J.M.,
Lin Y.C., Michelson P.F., Nolan P.L., Shriver S.K., Willis T.D.,
Kanbach G., Mayer-Hasselwander H.A., Merck M., Radecke H.-D.,
Kniffen D.A., Schneid E.J.
<Astrophys. J. Suppl. Ser. 101, 259 (1995)>
=1995ApJS..101..259T 1995ApJS..101..259T
ADC_Keywords: Gamma rays
Mission_Name: CGRO
Description:
The second catalog of high-energy gamma-ray observations from the
Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma
Ray Observatory includes data from Phase 1 (1991 April - 1992
November) and Phase 2 (1992 November - 1993 September) of the mission.
In addition to including more data than the first EGRET catalog
(1994ApJS...94..551F 1994ApJS...94..551F), this catalog uses an improved model of the
diffuse galactic gamma radiation. The 129 sources in the catalog
include one solar flare bright enough to be detected as a source, the
Large Magellanic Cloud, five pulsars, 40 high-confidence
identifications of active galactic nuclei, 11 AGN identifications with
lower confidence, and 71 sources not yet identified with known
objects. Also included a re approximate upper limits for gamma-ray
sources at any point in the sky and information about sources listed
in the first EGRET catalog but not appearing in this one.
The main catalog (table 4) was revised slightly after the
preprint was made.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 139 1041 The Second EGRET Catalog
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- 2EG Name based on the J2000 coordinates (1)
17- 22 F6.2 deg RAdeg J2000 right ascension measured by EGRET
24- 29 F6.2 deg DEdeg J2000 declination measured by EGRET
32- 37 F6.2 deg GLON Galactic longitude
39- 44 F6.2 deg GLAT Galactic latitude
47- 49 I3 arcmin MajErr ? Semimajor axis of error ellipse (2)
51- 53 I3 arcmin MinErr ? Semiminor axis of error ellipse (2)
57- 59 I3 deg paErr ? position angle of error ellipse (2)
63- 64 A2 --- Morph [CEem ] Morphology (3)
66 A1 --- l_Flux [<] upper limit for non-detections
67- 72 F6.1 10-8ct/cm2/s Flux the flux (E>100MeV)
75- 78 F4.1 10-8ct/cm2/s e_Flux ? 1-sigma statistical uncertainty in Flux
81- 83 F3.1 --- SpIndex ? photon number spectral index (4)
86- 88 F3.1 --- e_SpIndex ? 1-sigma uncertainty in SpIndex
90 A1 --- l_Counts [<] Limit flag for Counts
92- 95 I4 ct Counts Number of E>100 MeV photons (5)
98-102 F5.1 --- sqrtTS Statistical significance of detection (6)
105-110 A6 --- VP Viewing Period of the Observation (7)
113 A1 --- ID [PGAa] Identification of the detection (8)
116-130 A15 --- OtherName Other name of the Identification (9)
132 I1 --- Note [1/6]? Individual note (10)
135-139 A5 --- Ref [a-z, ] References
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Note (1): Name is based on the J2000 coordinates for the best position of the
source, following the IAU naming convention (PASP 102, 1231).
It should be emphasized that the measured positions are generally not as
precise as the name might suggest.
Note (2): semimajor and semiminor axes respectively of an ellipse fitted to
the 95% confidence error contour, in arcmin. The position angle of
the major axis is measured eastward from north in celestial coordinates.
Emtpy values indicate that the error box is not well represented by
an ellipse.
Note (3): the following symbols are used:
E = extended source (applies only to the Large Magellanic Cloud);
em = possibly extended source or multiple sources (based on source
location maps inconsistent with a single point source or poor fit
to the calibrated PSF);
C = source confusion may affect flux, significance, or position.
Sources with no entry in this column are consistent with the EGRET
point spread function for a single source.
Note (4): the SpIndex represents Flux(E) ∝ E^(-SpIndex)
in the energy range 100-2000 MeV.
Spectra have not been determined for all sources.
Note (5): Number of photons of Energy (E>100MeV) represented by the
flux or upper limit.
The uncertainty in the counts is proportional to e_Flux/Flux.
Note (6): the statistical significance of the E>100 MeV detection
is approximately equal to the statistical sigma for a single
measurement at a fixed position.
Note (7): see tables 1A and 1B for accurate definitions. Other values:
P1 = Phase 1 summed map 4/91 - 11/92;
P2 = Phase 2 summed map 11/92 - 9/93;
P12 = Phase 1 + 2 summed map 4/91 - 9/93;
0.2+ is the sum of viewing periods 0.2 - 0.5, all of which covered
the same region of the sky during the verification phase of
the mission;
36.+ is the sum of 36.0 and 36.5, which cover the same region of the sky.
Note (8):
P = pulsar (indicates detection of pulsed gamma radiation);
G = galaxy (the LMC is the only such object in the catalog);
A = active galactic nucleus;
a = active galactic nucleus (marginal). In this catalog, a marginal
identification is defined as one in which the candidate object
lies near but outside the 95% uncertainty contour. Note that this
is a different notation from that used in the first EGRET catalog,
which distinguished identifications by their statistical significance.
Note (9): the source name from the first EGRET catalog or other
gamma-ray references. In some cases, the source position has moved
from that given in earlier references. For identified sources, the
name or names of the object is given in this column.
Note (10): Notes on individual sources:
1 2EG J0241+6119 is positionally consistent with the variable
radio source GT0236+610
2 2EG J0618+2234 is positionally consistent with supernova remnant IC443
3 2EG J1324-4317 is positionally consistent with radio galaxy Cen A,
but the map is not fully consistent with a single point source
4 2EG J1626-2452 is strongly affected by the Rho Oph cloud. More detailed
modeling by Hunter et al (1994ApJ...436..216H 1994ApJ...436..216H) show that the source is
positionally consistent with 1622-253
5 2EG J1746-2852 is positionally consistent with the galactic center.
The diffuse model has larger uncertainties in this direction
than in most parts of the galactic plane (Hunter, et al., 1995).
6 2EG J2023-0836 is positionally consistent with AGN 2022-077 in
viewing period 7.2, based on E>1000 MeV analysis. The Phase 1 map
suggests the presence of a second source with a steeper spectrum.
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Table 1A: EGRET Viewing periods, Phase 1
-----------------------------------------------------------------
VP start end l b
-----------------------------------------------------------------
0.2 1991 Apr 22 21:10 1991 Apr 28 15:11 186.02 -3.28
0.3 1991 Apr 28 16:14 1991 May 01 16:31 193.39 -4.25
0.4 1991 May 01 17:19 1991 May 04 16:11 193.39 -4.28
0.5 1991 May 04 16:50 1991 May 07 15:49 184.50 -5.87
0.6 1991 May 07 16:35 1991 May 10 19:39 150.00 53.00
0.7 1991 May 10 20:15 1991 May 16 16:38 266.32 0.74
1.0 1991 May 16 17:19 1991 May 30 18:18 190.92 -4.74
2.0 1991 May 30 20:01 1991 Jun 08 00:08 73.28 2.56
2.1 1991 Jun 08 01:24 1991 Jun 15 00:08 194.86 -7.29
3.0 1991 Jun 15 23:24 1991 Jun 28 19:30 299.76 65.46
4.0 1991 Jun 28 20:43 1991 Jul 12 17:56 156.18 72.08
5.0 1991 Jul 12 18:48 1991 Jul 26 19:14 0.00 -4.00
6.0 1991 Jul 26 20:35 1991 Aug 08 15:35 278.00 -29.32
7.1 1991 Aug 08 17:24 1991 Aug 15 17:29 70.4 -8.30
7.2 1991 Aug 15 18:59 1991 Aug 22 13:37 25.00 -14.00
8.0 1991 Aug 22 15:07 1991 Sep 05 13:42 262.94 -5.67
9.1 1991 Sep 05 15:03 1991 Sep 12 13:23 338.94 -83.50
9.2 1991 Sep 12 14:34 1991 Sep 19 12:52 59.67 40.28
10.0 1991 Sep 19 14:38 1991 Oct 03 12:54 287.85 -54.31
11.0 1991 Oct 03 14:19 1991 Oct 17 13:57 294.25 63.67
12.0 1991 Oct 17 15:22 1991 Oct 31 14:52 310.71 22.21
13.1 1991 Oct 31 15:42 1991 Nov 07 14:34 25.00 -14.00
13.2 1991 Nov 07 15:30 1991 Nov 14 15:15 338.94 -83.50
14.0 1991 Nov 14 16:50 1991 Nov 28 11:29 285.04 -0.74
15.0 1991 Nov 28 12:50 1991 Dec 12 16:12 152.63 -13.44
16.0 1991 Dec 12 18:00 1991 Dec 27 16:01 0.00 20.29
17.0 1992 Dec 27 17:07 1992 Jan 10 16:15 283.21 -31.62
18.0 1992 Jan 10 18:21 1992 Jan 23 13:38 137.47 40.49
19.0 1992 Jan 23 15:08 1992 Feb 06 15:14 58.15 -43.00
20.0 1992 Feb 06 16:45 1992 Feb 20 15:02 39.70 0.76
21.0 1992 Feb 20 16:14 1992 Mar 05 15:39 171.52 -53.90
22.0 1992 Mar 05 16:45 1992 Mar 19 12:00 112.47 44.46
23.0 1992 Mar 19 14:32 1992 Apr 02 11:59 322.14 3.01
24.0 1992 Apr 02 15:05 1992 Apr 09 12:15 9.53 57.15
24.5 1992 Apr 09 15:15 1992 Apr 16 10:43 9.53 57.15
25.0 1992 Apr 16 15:19 1992 Apr 23 10:41 6.84 48.09
26.0 1992 Apr 23 13:34 1992 Apr 28 11:42 108.77 -41.43
27.0 1992 Apr 28 14:02 1992 May 07 12:24 332.24 2.52
28.0 1992 May 07 15:32 1992 May 14 12:18 108.77 -41.43
29.0 1992 May 14 15:20 1992 Jun 04 12:25 224.00 -40.00
30.0 1992 Jun 04 15:32 1992 Jun 11 14:01 252.41 30.66
31.0 1992 Jun 11 16:25 1992 Jun 25 12:08 163.09 11.92
32.0 1992 Jun 25 14:46 1992 Jul 02 13:23 284.20 22.89
33.0 1992 Jul 02 15:08 1992 Jul 16 14:40 252.41 30.66
34.0 1992 Jul 16 17:33 1992 Aug 06 14:25 108.75 -2.37
35.0 1992 Aug 06 16:35 1992 Aug 10 23:41 335.10 -25.56
36.0 1992 Aug 11 02:07 1992 Aug 12 16:59 169.84 -11.35
36.5 1992 Aug 12 19:47 1992 Aug 20 13:55 168.17 -9.46
37.0 1992 Aug 20 17:30 1992 Aug 27 16:18 104.83 -42.06
38.0 1992 Aug 27 18:45 1992 Sep 01 04:31 335.10 -25.56
39.0 1992 Sep 01 06:24 1992 Sep 17 13:57 167.18 -9.18
40.0 1992 Sep 17 16:56 1992 Oct 08 13:15 195.90 44.71
41.0 1992 Oct 08 16:27 1992 Oct 15 15:55 228.02 2.84
42.0 1992 Oct 15 17:11 1992 Oct 29 12:58 359.98 -44.59
43.0 1992 Oct 29 19:30 1992 Nov 03 12:30 31.13 -28.33
44.0 1992 Nov 03 15:50 1992 Nov 17 13:11 228.02 2.84
-----------------------------------------------------------------
Table 1B: EGRET Viewing periods, Phase 2
------------------------------------------------------------------
VP start end l b
------------------------------------------------------------------
201.0 1992 Nov 17 17:17 1992 Nov 24 16:03 66.79 39.28
202.0 1992 Nov 24 17:50 1992 Dec 01 15:08 70.85 40.50
203.0 1992 Dec 01 17:35 1992 Dec 22 12:24 77.85 0.69
204.0 1992 Dec 22 14:52 1992 Dec 29 13:57 294.70 61.88
205.0 1992 Dec 29 18:14 1993 Jan 05 12:38 294.46 61.58
206.0 1993 Jan 05 17:13 1993 Jan 12 13:00 294.70 61.88
207.0 1993 Jan 12 16:13 1993 Feb 02 12:46 314.06 31.51
208.0 1993 Feb 02 16:22 1993 Feb 09 15:05 307.39 20.75
209.0 1993 Feb 09 18:15 1993 Feb 22 15:44 0.24 -34.01
210.0 1993 Feb 22 17:27 1993 Feb 25 13:04 355.62 6.28
211.0 1993 Feb 25 17:22 1993 Mar 09 14:22 125.86 -4.70
212.0 1993 Mar 09 16:51 1993 Mar 23 16:23 83.74 11.67
213.0 1993 Mar 23 19:35 1993 Mar 29 12:27 182.63 -8.22
214.0 1993 Mar 29 15:46 1993 Apr 01 14:14 355.62 6.28
215.0 1993 Apr 01 17:48 1993 Apr 06 19:13 311.66 22.89
216.0 1993 Apr 06 21:10 1993 Apr 12 11:24 140.75 38.11
217.0 1993 Apr 12 13:50 1993 Apr 20 12:27 311.66 22.89
218.0 1993 Apr 20 15:56 1993 May 03 21:04 151.41 71.26
219.0 1993 May 05 16:06 1993 May 06 21:40 350.10 15.86
220.0 1993 May 08 14:55 1993 May 13 14:26 298.09 -44.63
221.0 1993 May 13 16:44 1993 May 24 14:24 187.52 -5.88
222.0 1993 May 24 17:15 1993 May 31 12:13 157.79 70.63
223.0 1993 May 31 14:35 1993 Jun 03 14:01 359.14 -0.09
224.0 1993 Jun 03 16:52 1993 Jun 14 23:44 298.09 -44.63
226.0 1993 Jun 19 14:58 1993 Jun 29 12:48 355.00 5.00
227.0 1993 Jun 29 15:00 1993 Jul 13 12:37 148.11 41.22
228.0 1993 Jul 13 14:07 1993 Jul 27 11:35 149.86 42.69
230.0 1993 Jul 27 14:03 1993 Jul 30 12:59 276.66 -2.27
230.5 1993 Jul 30 14:25 1993 Aug 03 12:50 278.79 1.44
231.0 1993 Aug 03 21:36 1993 Aug 10 12:01 22.22 -13.08
229.0 1993 Aug 10 15:07 1993 Aug 11 16:08 5.00 5.00
229.5 1993 Aug 12 15:50 1993 Aug 17 11:29 5.00 5.00
232.0 1993 Aug 24 14:52 1993 Sep 07 13:36 347.5 0.00
------------------------------------------------------------------
Table 2: Source Location Accuracy for Identified Sources
near the Galactic Plane
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Source Offset(arcmin) Nearest Error Contour
-----------------------------------------------------
Solar Flare 28.0 95 %
Crab Pulsar 4.2 95 %
Geminga Pulsar 1.3 50 %
Vela Pulsar 2.4 99 %
PSR B1055-52 16.4 95 %
PSR B1706-44 4.9 95 %
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Table 3: Source Location Accuracy for Selected AGN
---------------------------------------------------
Source Offset(arcmin) Nearest Error Contour
---------------------------------------------------
0208 -512 10.2 95 %
0528+134 7.2 68 %
1406-076 11.4 95 %
1633+382 7.2 68 %
Mkn 421 2.4 50 %
3C273 3.0 50 %
3C279 1.2 68 %
3C454.3 7.2 50 %
---------------------------------------------------
Table 5: Sources from the first EGRET catalog (1994ApJS...94..551F 1994ApJS...94..551F)
not appearing in the second catalog
----------------------------------------------
Source sqrtTS in present analysis
----------------------------------------------
GRO J0017-01 3.1
PKS 0506-612 3.9
GRO J0435+25 3.1
PKS 0454-263 3.9
PKS 0454-463 3.8
GRO J0527+18 4.3 *
GRO J0542+26 4.5 *
GRO J0546-02 < 2.0
GRO J0856-42 4.9 *
GRO J0902-35 4.8 *
GRO J1044-77 3.8
GRO J1220+16 3.6
GRO J1308-61 4.5 *
GRO J1401-60 4.0 *
GRO J1654-09 3.2
GRO J1722-05 3.8
GRO J1726+03 3.8
GRO J1732-31 3.4
PKS J1741-038 3.9
GRO J1817-09 < 2.0
GRO J1817-15 2.4
GRO J1835-06 < 2.0
GRO J1842-02 < 2.0
GRO J1857+05 3.0
GRO J1904+06 3.5
GRO J1910+11 2.1
GRO J1913-34 3.4
GRO J1921+17 2.3
GRO J2154+71 4.2 *
GRO J2157+18 3.3
PKS 2005-489 3.8
----------------------------------------------
*Best position has |b| < 10 degrees
----------------------------------------------
See also:
ftp://gamma.gsfc.nasa.gov/pub/second_catalog
ftp://gamma.gsfc.nasa.gov/pub/first_catalog
Acknowledgements:
We sincerely thank Prof. David Thompson
for providing an access to the data.
References:
a =1994ApJS...94..551F 1994ApJS...94..551F Fichtel, et al. (First EGRET Catalog)
b =1993ApJS...86..629T 1993ApJS...86..629T Thompson, et al., 1993c
c Lin, et al., 1995b, ApJ, submitted
d =1995ApJ...440..525V 1995ApJ...440..525V Montigny et al., 1995
e Nolan, et al., 1995, ApJ, submitted
f =1993ApJ...405L..21B 1993ApJ...405L..21B Bertsch, et al., 1993a
g Dingus, et al., 1995, ApJ, submitted
h =1993A&A...272...59H 1993A&A...272...59H Hunter, et al., 1993b
i Kniffen, et al., 1995, ApJ, submitted
j =1995ApJ...438..659R 1995ApJ...438..659R Radecke, et al., 1995
k =1993A&AS...97..349K 1993A&AS...97..349K Kanbach, et al., 1993
l =1995ApJ...442...96L 1995ApJ...442...96L Lin, et al., 1995a
m =1993ApJ...409..134H 1993ApJ...409..134H Hunter, et al., 1993a
n =1992ApJ...400L..67S 1992ApJ...400L..67S Sreekumar, et al., 1992
o =1993ApJ...409..697N 1993ApJ...409..697N Nolan, et al., 1993a
p =1993ApJ...415L..13T 1993ApJ...415L..13T Thompson, et al., 1993c
q =1992Natur.357..306B 1992Natur.357..306B Bertsch, et al., 1992
r =1994ApJ...421..276M 1994ApJ...421..276M Mayer-Hasselwander, et al., 1994
s Mukherjee, et al., 1995a, ApJ, in press
t =1994ApJ...436..216H 1994ApJ...436..216H Kanbach, et al., 1994
u Kanbach, et al., 1995, ApJ, in press
v Sreekumar, et al., 1995, ApJ, in press
w =1993ApJ...413L..27F 1993ApJ...413L..27F Fierro, et al., 1993
x =1992ApJ...401L..61L 1992ApJ...401L..61L Lin, et al., 1992
y =1993A&AS...97..101V 1993A&AS...97..101V Montigny, et al., 1993
z =1992ApJ...385L...1H 1992ApJ...385L...1H Hartman, et al., 1992
aa =1993ApJ...411..133K 1993ApJ...411..133K Kniffen, et al., 1993
bb Wagner, et al., 1995, ApJ, submitted
cc Bertsch, et al., 1995, ApJ, submitted
dd =1994ApJ...436..216H 1994ApJ...436..216H Hunter, et al., 1994
ee =1993ApJ...410..609M 1993ApJ...410..609M Mattox, et al., 1993
ff =1992Natur.359..615T 1992Natur.359..615T Thompson, et al., 1992
gg Mayer-Hasselwander, et al., 1995, A&A, submitted
hh Mattox, et al., 1995b, ApJ, submitted
ii =1993ApJ...414...82N 1993ApJ...414...82N Nolan, et al., 1993b
jj =1993ApJ...407L..41H 1993ApJ...407L..41H Hartman, et al., 1993
kk Ramanamurthy et al., 1995, ApJ, in press
(End) Francois Ochsenbein [CDS] 08-Mar-1996