Fermi Gamma-Ray Sky

Thursday, January 23, 2014

Fermi LAT Weekly report N. 293

Covered period: 2014.January.13 - 2014.January.19
LAT Mission week: 293.57 - 294.57

S5 1044+71 detected in flaring activity on January 17 with a daily flux (1.3±0.4) X 10^-6. See ATel#5784. The source was also detected on January 16 and 18, with a daily flux (0.9±0.4) X 10^-6 and (0.6±0.3) X 10^-6, respectively.
3C 279 detected from January 13 to 18, with a daily flux between (0.6±0.2) X 10^-6 and (2.5±0.4) X 10^-6.
4C +38.41 detected on January 13, 14, 15, 17, and 19, with a daily flux between (0.5±0.1) X 10^-6 and (0.7±0.1) X 10^-6.
NGC 1275 detected on January 14, 15, 17, 18, and 19, with a daily flux between (0.7±0.2) X 10^-6 and (1.1±0.3) X 10^-6.
B3 1343+451 detected on January 14, 15, 16, 18, and 19, with a daily flux between (0.3±0.1) X 10^-6 and (0.6±0.2) X 10^-6.
PKS 2326-502 detected on January 13, 15, 17, and 18, with a daily flux between (0.6±0.2) X 10^-6 and (1.0±0.3) X 10^-6.
PKS 1510-08 detected on January 13, 18, and 19, with a daily flux between (0.4±0.1) X 10^-6 and (0.9±0.2) X 10^-6.
4C +21.35 detected from January 15 to 17, with a daily flux between (0.5±0.2) X 10^-6 and (0.6±0.2) X 10^-6.
CTA 102 detected on January 16 with a daily flux of (1.8±0.9) X 10^-6.
Sporadic activity (daily fluxes below 10^-6): PKS 0135-247 (January 13), PKS 1424-418 (January 14 and 16), PKS 0735+17 (January 15), S4 1144+40 (January 15), GB6 J1542+6129 (January 15), 4C +28.07 (January 16), PKS 0426-380 (January 17), PKS 2322-482 (January 17), Mrk 501 (January 18), B2 1520+31 (January 19), and 1ES 1959+650 (January 19).

Fluxes are in the unit of photons/cm2/s above 100 MeV. All errors are statistical only.

Note. All the fluxes reported above are from the ASP analysis and should be considered preliminary and should not be used for publication, however they are indicative of the flux range and the current status of a source. Source association is done on the basis of source location, considering spatial coincidence only, and it is not indicative of an identification.
- Please acknowledge the LAT team if you use information from this report.

For questions and comments please contact:
- M. Orienti (orienti[at]ira.inaf.it) and F. D'Ammando (dammando[at]ira.inaf.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.

Wednesday, January 15, 2014

Fermi LAT Weekly report N. 292

Covered period: 2014 January 6-12
LAT Mission week: 292.57 - 293.57

4C +21.35 (PG 1222+216) showed a short flare on January 7 with a daily flux of about 1.6E-6.
PKS 1424-41 and PKS 2326-502 both bright and detected in most of the days of the week, the former peaking at about 1.2E-6 on January 8 and the latter at 1E-6 on January 7 and 9.
Flare of 4C +01.02 (OC 12, PKS 0106+01) on January 10 with a daily flux of about 1E-6.
4C +38.41 (B2 1633+38) was in high state on January 7 with a daily flux about 1E-6 and 3C 454.3 on January 12 with a daily flux 1.2E-6.
Further bright blazars detected in some days of the week with a daily flux in the range 0.6-0.8E-6: NGC 1275 (Per A), S5 1044+71, 3C 279, PKS 1510-08, PKS 0250-225.
Other blazars detected sporadicly during the week and with a daily flux equal or lower than about 0.5E-6: PMN J1626-2426, Mkn 421, Mkn 501, B2 1520+31, PKS 0301-243, NRAO 530 (PKS 1730-13), PKS 0426-380, PKS 0208-512, PKS 1622-29.
GRBs detected by the LAT during the week: GRB 140110A.
X1.2 solar flare detected by the LAT on January 7.

Fluxes are in the unit of photons/cm^2/s above 100 MeV. All uncertainties are statistical only.

Note. All the flux reported above are by the ASP analysis and should be considered preliminary and should not be used for publication, however they are indicative of the flux range and the current status of a source. Source association is done on the basis of source location, considering spatial coincidence only, and it is not indicative of an identification.
- Please acknowledge the LAT team if you use information from this report.

For questions and comments please contact:
- S. Ciprini (stefano.ciprini[at]asdc.asi.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.

Tuesday, January 7, 2014

Fermi LAT Weekly report N. 291

Covered period: 2013 December 30 - 2014 January 5
LAT Mission week: 291.57 - 292.57

3C 279 in high state during the week with daily flux above 1E-6 and peaking on January 1 at about 1.8E-6.
4C +21.35 (PG 1222+216) in high state during the week with daily flux above 1E-6 and peaking on January 3 and 5 at about 1.7E-6.
PKS 2326-502 bright in some days of the week and peaking on January 3 at about 1.3E-6.
4C +38.41 (B2 1633+38) and PKS 1424-41 both bright in some days of the week and peaking at about 1.2E-6 respectively on January 3 and 5.
NGC 1275 (Per A) increased its activity during the week reaching a daily flux level of about 1E-6 on January 2, 3 and 5.
S5 1044+71 rather bright during the week and peaking on December 31, January 1 and 2 at about 0.8E-6.
Other blazars detected in some days of the week with a daily flux lower than about 0.7E-6: PG 1553+113, PKS 1510-089, Mkn 421, PKS 0735+17, PKS 0208-512, B3 1343+451, PKS 0426-380, PKS 0454-234, 3C 454.3, PKS 0336-01, 4C +28.07 (OD 258, B2 0234+28).
Three GRBs clearly detected by the LAT during the week: GRB 131231A, GRB 140102A and GRB 140104B.

Sunday, January 5, 2014

Fermi LAT Weekly Report N. 290

Covered period: 2013.Dec.23 - 2013.Dec.29
LAT Mission week: 290.57 - 291.57

A flare from PKS 2136-642 was detected. It peaked on Dec. 23 with a daily averaged flux of (1.3 +/- 0.4) (See ATel #5695)
PKS 1730-13 was detected Dec. 23 with a daily averaged flux of (1.5 +/- 0.3).
4C +21.35 was detected all week with a daily averaged flux between (0.8 +/- 0.3) and (1.8 +/- 0.3).
PKS 2326-502 was detected all week with a daily averaged flux between (0.8 +/- 0.2) and (2.0 +/- 0.6).
3C 279 was detected all week with a daily averaged flux between (1.3 +/- 0.4) and (2.0 +/- 0.5).
PKS 0426-380 was detected all week with a daily averaged flux between (0.5 +/- 0.2) and (1.1 +/- 0.2).
Sporadic daily detections of blazars (fluxes below 1): Mkn 421, NGC 1275, PKS 0454–234, PKS 0426-380, B3 1343+451, PKS 0735+17, PKS B1424-418, S5 1044+71, 4C +28.07, S4 1144+40.

Fluxes are in the unit of 10^-6 photons/cm²/s above 100 MeV. All errors are statistical only.

Note. All the fluxes reported above are from the ASP analysis and should be considered preliminary and should not be used for publication, however they are indicative of the flux range and the current status of a source. Source association is done on the basis of source location, considering spatial coincidence only, and it is not indicative of an identification.
- Please acknowledge the LAT team if you use information from this report.

For questions and comments please contact:
- R. Ojha (roopesh.ojha[at]gmail.com) for generic information related to this week
- Contact persons on this page for individual sources cited above.

Tuesday, December 31, 2013

Fermi LAT weekly report N. 289

Covered period: 2013.Dec.16 – 2013.Dec.22
LAT Mission week: 289.57 - 290.57

3C 279 persisted in the high stated observed the previous week and reached a daily flux of 6× 10^–6 on 2013 December 20 (ATel #5680). This is the highest flux observed by the LAT since the start of the Fermi mission. The day of the peak the source showed a daily hard photon index of 1.80 +/- 0.06.
PKS 1730–13 detected in flaring state: the blazar reached a daily averaged flux of 1 × 10^–6on 2013 December 21 and of 1.5 × 10^–6on 2013 December 22.
PKS 2326–502 was detected almost all week with daily flux above 2 × 10^–6.
PKS 0426–380 was detected all week long (daily flux between 0.4 × 10^–6and 1.1 × 10^–6).
PKS 1424–418 was detected almost all week with a daily flux ranging between 0.4 × 10^–6 and 0.8 × 10^–6.
4C +21.35 was detected throughout the week and reached a peak flux = 1 × 10^–6 on 2013 December 20.
Other blazars detected in some days of the week with a daily flux lower than 1 × 10^–6 : PKS 1244-255, PMN J2345-1555, PKS 0454-234, VER 0521+211, S5 1044+71, Mrk 421, B3 1343+451, CTA 102, 4C +28.07, NGC 1275, B2 1520+31, PKS 2142-75, 4C +55.17, PKS 2023-07, PKS 0716+71, B2 2308+34.

Fluxes are in the unit of photons/cm²/s above 100 MeV. All errors are statistical only.
Note. All the fluxes reported above are from the ASP analysis and should be considered preliminary and should not be used for publication, however they are indicative of the flux range and the current status of a source. Source association is done on the basis of source location, considering spatial coincidence only, and it is not indicative of an identification.

- Please acknowledge the LAT team if you use information from this report.

For questions and comments please contact:
- S. Buson (sara.buson[at]pd.infn.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.

Fermi LAT weekly report N. 288

Covered period: 2013.Dec.9 – 2013.Dec.15
LAT Mission week: 288.57 - 289.57

FERMI J0623-3351 was detected for the first time in gamma rays on 2013 December 14. The source showed a flux of 0.1 × 10^–6 and a particularly hard gamma-ray spectrum with a photon index of 1.9+/-0.1 (ATel #5668). Follow-up observations indicated that the gamma-ray source is probably associated with the blazar PMN J0623-3350 (ATel #5684).
3C 279 was detected all week with daily flux above 1 × 10^–6. The highest flux reached during this week was 3.2 × 10^–6 and was observed on 2013 December 10.
PKS 2326–502 was detected all week; the highest daily flux of 2.1 × 10^–6 was recorded on 2013 December 15.
PKS 1510-089 was detected all week with a daily flux ranging between 0.4 × 10^–6 and 0.9 × 10^–6.
PKS 0426–380 was detected all week long (daily flux between 0.1 × 10^–6and 0.6 × 10^–6).
4C +21.35 was detected throughout the week and reached a peak flux = 1 × 10^–6 on 2013 December 11.
Other blazars detected in some days of the week with a daily flux lower than 1 × 10^–6 : Mrk 421, PKS 1424–418, PKS 0454-234, S5 1044+71, PKS 0208–512, NGC 1275, B3 1343+451, CTA 102, PKS 1244-255, VER 0521+211, B2 1520+31, PKS 0524–485, PKS 2142-75, 4C +28.07.

Fluxes are in the unit of photons cm^–2s^–1 above 100 MeV. All errors are statistical only.

For questions and comments please contact:
- S. Buson (sara.buson[at]pd.infn.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.

Friday, December 6, 2013

Fermi LAT weekly report N. 286

Covered period: 2013.Nov.24 - 2013.Dec.1
LAT Mission week: 286.57 - 287.57

PKS 2326-502 was detected all week with a daily averaged flux between 0.4 x 10^-6 and 1.1 x 10^-6.
3C 279 was detected all week reaching a daily flux of 1.5 x 10^-6 on November 26.
PKS 1424–41 was detected all week with a daily averaged flux below 1 x 10^-6.
BL Lacertae was not in high-state in gamma rays despite It reached the historical maximum in optcial band (ATel #5597). It was detected twice with flux of 0.3 x 10^-6 and 0.4 x 10^-6 (November 25 and 27).
VER 0521+211 was detected few times during the week reaching a daily flux of 1.5 x 10^-6 on November 30.
Fermi J1725-3726 (short high-energy galactic transient) was detected on December 1 with a flux of 1.3 x 10^-5 in the time interval 11:22 - 11:27 UTC (ATel #5625).
Other blazars detected in some days of the week with a daily flux lower than about 1 x 10^-6: NGC 1275, PKS 1454-354 , 4C +21.35 (PG 1222+216), Mrk 421, PKS 1510–08, 4C +01.02 (PKS 0106+01), B3 1343+451, 3C 454.3, B2 1520+31 and PKS 1244-255.

Fluxes are in the unit of photons/cm²/s above 100 MeV. All errors are statistical only.

Note. All the fluxes reported above are from the ASP analysis and should be considered preliminary and should not be used for publication, however they are indicative of the flux range and the current status of a source. Source association is done on the basis of source location, considering spatial coincidence only, and it is not indicative of an identification.
- Please acknowledge the LAT team if you use information from this report.

For questions and comments please contact:
- S. Cutini (sara.cutini[at]asdc.asi.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.