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1 Crab = 74 SSC cts/sec

This is the 2005 archive.

17 January 2006 --

Weeks 518-519 results (2005 December 30 - 2006 January 12)

Mkn 421 - in the range 20 to 50 mCrab
Cyg X-3 - increased to ~260 mCrab and the spectrum became noticeably softer, i.e., HR2 declined

3 January 2006 --
Week 517 results (2005 December 23 - 29)

X0535+262 - declined to <13 mCrab
X0918-548 - may be up to ~13 mCrab
Mkn 421 - ~40 mCrab
Cyg X-3 - rose to ~200 mCrab

28 December 2005 --
Week 516 results (2005 December 16 - 22)

X0535+262 - rose to ~90 mCrab (also see ATel 676)
X1630-472 - a small number of observations show the intensity near 200 mCrab, however, given the proximity of the Sun to this region of the sky, the possibility that this is a spurious result cannot be eliminated (also see ATel 675)
Cyg X-1 - up to ~500 mCrab and HR2 appears to have declined slightly (this suggests that a transition to the high/soft state could come soon)

19 December 2005 --
Week 515 results (2005 December 9 - 15)

GX 3+1 - may have risen from ~200 to ~330 mCrab
Aql X-1 - may have risen to ~65 mCrab
X1957+115 - may have decreased to ~13 mCrab

12 December 2005 --
Week 514 results (2005 December 2 - 8)

Mkn 421 - ~25 mCrab
HETE J1900.1-2455 - continues to appear near 20 or so mCrab
Aql X-1 - may have flared to ~60 mCrab

2 December 2005 --
Week 513 results (2005 November 25 - December 1)

Mkn 421 - 18 to 30 mCrab
X1724-307 - roughly 50 mCrab
Aql X-1 - probably ~13 mCrab (but data are noisy)

28 November 2005 --
Week 512 results (2005 November 18 - 24)

X1724-307 - up to ~120 mCrab
Aql X-1 - declined to ~18 mCrab

21 November 2005 --
Week 511 results (2005 November 11 - 17)

Aql X-1 - rose to ~80 mCrab

14 November 2005 --
Week 510 results (2005 November 4 - 10)

Cir X-1 - ~250 mCrab
X1608-522 - down to < 20 mCrab based on a sparse set of data

Caveat: Few notes appear in this week's list because the quantity and quality of the measurements were less than the norm. A note only appears in this list if there is sufficient data to make a reasonable judgment about the state of the source and that data suggests that something noteworthy is happening.
7 November 2005 --
Week 509 results (2005 October 28 - November 3)

X0918-548 - near 13 mCrab
Cir X-1 - variable with a peak intensity of ~440 mCrab
X1608-522 - decreased to ~65 mCrab
XTE J1726-476 - in the range 50 to 100 mCrab (data are subject to relatively large errors)
Swift J1753.5-0127 - ~15 mCrab
XTE J1818-245 - roughly 30 mCrab

2 November 2005 --
Week 508 results (2005 October 21 - 27)

X0918-548 - rose to ~13 mCrab and possibly higher
GRO J1008-57 - rose to ~20 mCrab
X1608-522 - roughly steady around 200 mCrab
IGR J17098-3626 - very roughly 20 mCrab
XTE J1726-476 - ~50 mCrab
Swift J1753.5-0127 - ~13 mCrab
XTE J1818-245 - ~40 mCrab
HETE J1900.1-2455 - may have increased modestly to ~33 mCrab

24 October 2005 --
Week 507 results (2005 October 14 - 20)

Mkn 421 - ~20 mCrab
X1608-522 - remained near 200 mCrab
IGR J17098-3626 - roughly 25 mCrab
XTE J1726-476 - ~30 mCrab
Swift J1753.5-0127 - down to ~13 mCrab
XTE J1818-245 - decreased to ~25 mCrab
HETE J1900.1-2455 - 20 to 25 mCrab
GRS1915+105 - strong and active with flares to ~2.5 Crab

17 October 2005 --
Week 506 results (2005 October 7 - 13)

Cir X-1 - was as strong as ~450 mCrab
X1608-522 - as strong as 250 mCrab
IGR J17098-3626 - ~30 mCrab
GX 1+4 - appears to be up to ~15 mCrab
XTE J1726-476 (aka XTE J1727-476) - decayed to ~50 mCrab after peaking at ~100 mCrab
Swift J1753.5-0127 - still ~15 mCrab
XTE J1818-245 - decreased slightly to ~55 mCrab
HETE J1900.1-2455 - still 20 to 25 mCrab

11 October 2005 --
Week 505 results (2005 September 30 - October 6)

X1608-522 - up to ~150 mCrab at the end of the week
IGR J17098-3626 - ~35 mCrab (based on noisy data)
XTE J1726-476 - this is a new source (see ATEL Nos. 623 and 624) that rose from <13 mCrab to ~80 mCrab; the spectrum is rather soft
Swift J1753.5-0127 - ~15 mCrab
XTE J1818-245 - declined to ~60 mCrab
HETE J1900.1-2455 - still ~20 mCrab

3 October 2005 --
Week 504 results (2005 September 23 - 29)

Cir X-1 - rose to ~180 mCrab
X1608-522 - up to ~65 mCrab
GRO J1655-40 - declined to less than 15 mCrab or so
IGR J17098-3626 - data suggest a strength of ~40 mCrab
H1743-322 - <15 mCrab
Swift J1753.5-0127 - ~15 mCrab
XTE J1818-245 - down to ~100 mCrab
HETE J1900.1-2455 - ~20 mCrab

26 September 2005 --
Week 503 results (2005 September 16 - 22)

Cir X-1 - < 20 mCrab
GRO J1655-40 - dropped to ~20 mCrab
Swift J1753.5-0127 - down to ~15 mCrab
XTE J1818-245 - ~130 mCrab

19 September 2005 --
Week 502 results (2005 September 9 - 15)

X0535+262 - declined to <15 mCrab
Cir X-1 - <15 mCrab
GRO J1655-40 - declined to ~120 mCrab
Swift J1753.5-0127 - 15 to 25 mCrab
XTE J1818-245 - roughly 160 mCrab

12 September 2005 --
Week 501 results (2005 September 2 - 8)

X0535+262 - declined to ~50 mCrab
Cir X-1 - rose to ~65 mCrab for ~4 days, and then weakened again
GRO J1655-40 - declined to ~260 mCrab, and the spectrum is growing softer
IGR J17098-3626 - ~35 mCrab
H1743-322 - down to ~50 mCrab
Swift J1753.5-0127 - still just over 30 mCrab
XTE J1818-245 - ~140 mCrab
HETE J1900.1-2455 - perhaps ~20 mCrab
GRS 1915+105 - strong and active with one flare to ~2.4 Crab

8 September 2005 --
Week 500 results (2005 August 26 - September 1)

X0535+262 - rose to ~160 mCrab
Cir X-1 - was < 13 mCrab for about 10 days then rose to ~65 mCrab
GRO J1655-40 - declined smoothly to ~400 mCrab
X1702-429 - down to ~30 mCrab
IGR J17098-3626 - 25 to 30 mCrab
X1730-333 (Rapid Burster) - declined to ~13 mCrab
XTE J1739-285 - ~50 mCrab (but lower right at week's end)
H1743-322 - decreased to ~75 mCrab
Swift J1753.5-0127 - roughly 30 mCrab
XTE J1818-245 - fell to ~150 mCrab (see ATEL Nos. 578-580 and others)
HETE J1900.1-2455 - ~25 mCrab

31 August 2005 --
Weeks 498-499 results (2005 August 12 - 25)

GRO J1655-40 - declined to ~530 mCrab
X1702-429 - ~60 mCrab
IGR J17098-3626 - still about 25 mCrab
X1724-307 - ~25 mCrab
X1730-333 (Rapid Burster) - rose and then varied in the range 30 to 130 mCrab
H1743-322 - rose to ~200 mCrab and then declined to ~150 mCrab
Swift J1753.5-0127 - slowly and smoothly declined to ~40 mCrab
HETE J1900.1-2455 - 15 to 25 mCrab (noisy data)
GRS1915+105 - 150 to 300 mCrab

15 August 2005 --
Week 497 results (2005 August 5 - 11)

X0512-40 - declined to <10 mCrab
GRO J1655-40 - down to ~800 mCrab
X1724-307 - ~80 mCrab
H1743-322 - rose to ~50 mCrab (also see ATEL No. 576)
X1744-361 - <25 mCrab
Swift J1753.5-0127 - declined to ~60 mCrab

8 August 2005 --
Week 496 results (2005 July 29 - August 4)

X0512-401 - ~25 mCrab
EXO0748-676 - down to ~13 mCrab
GRO J1655-40 - ~870 mCrab and slowly declining
X1724-307 - ~60 mCrab
Swift J1753.5-0127 - ~80 mCrab
HETE J1900.1-2455 - appears to be ~15 mCrab
GRS1915+105 - has decreased to ~200 mCrab

2 August 2005 --
Week 495 results (2005 July 22 - 28)

X0512-401 - ~20 mCrab
Cir X-1 - was as strong as 260 mCrab
GRO J1655-40 - steady near 1 Crab
IGR J17098-3626 - somewhat noisy data suggest the strength has risen to ~50 mCrab
X1724-307 - up to ~40 (possibly ~50) mCrab
X1744-361 - roughly 50 mCrab, but the trend is unclear
Swift J1753.5-0127 - declined to ~90 mCrab

25 July 2005 --
Week 494 results (2005 July 15 - 21)

X0512-401 - ~20 mCrab
X0535+262 - <15 mCrab (but may be detectable at 5 to 10 mCrab)
EXO 0748-676 - ~30 mCrab
X1246-588 - ~20 mCrab
Cir X-1 - decreased to <15 mCrab
GRO J1655-40 - ~0.9 Crab
X1744-361 - rose to ~80 mCrab
Swift J1753.5-0127 - declined to ~120 mCrab
HETE J1900.1-2455 - appears to have decreased to < 15 mCrab nd then brightened to possibly 30 mCrab

18 July 2005 --
Week 493 results (2005 July 8 - 14)

Cir X-1 - ~150 mCrab
GRO J1655-40 - just above 800 mCrab
IGR J17098-3626 - ~24 mCrab
X1745-203 - decreased to ~18 mCrab
Swift J1753.5-0127 - decreased to ~150 mCrab
HETE J1900.1-2455 - decreased to ~25 mCrab

11 July 2005 --
Week 492 results (2005 July 1 - 7)

EXO 0748-676 - ~25 mCrab
Cir X-1 - at ~130 mCrab and rising
GRO J1655-40 - ~0.8 Crab
X1745-203 - decreased to ~60 mCrab
Swift J1753.5-0127 - ~190 mCrab (the full mission light curve is available now)
HETE J1900.1-2455 - roughly 25 mCrab
X1608-522 - remains near 30 mCrab

5 July 2005 --
Week 491 results (2005 June 24 - 30)

X0535+262 - limited observations show an intensity of roughly 20 mCrab
Cir X-1 - possibly up to ~13 mCrab
X1608-522 - roughly steady near 30 mCrab
GRO J1655-40 - roughly steady near 570 mCrab
X1745-203 - ~130 mCrab
SWIFT J1753.5-0127 - rose to ~140 mCrab in week 492 (the ASM light curve is not available yet; also see ATEL 550 and others)
SAX J1808.4-3658 - in the range 0 to 13 mCrab
HETE J1900.1-2455 - ~20 mCrab

27 June 2005 --
Week 490 results (2005 June 17 - 23)

X0535+262 - a small number of observations (3) indicate the strength is ~150 mCrab
EXO 0748-676 - up to ~25 mCrab
Cir X-1 - mostly < 10 mCrab
X1608-522 - down to ~20 then back up to ~50 mCrab
GRO J1655-40 - down to ~0.7 Crab
IGR J17098-3626 - down to ~15 mCrab
X1745-203 - declined to ~90 mCrab
SAX J1808.4-3658 - certainly below 20 mCrab (but may still be detectable near 10 mCrab)
HETE J1900.1-2455 - near 20 mCrab (see ATEL nos.516, 523, and others)

20 June 2005 --
Week 489 results (2005 June 10 - 16)

X1608-522 - declined to ~20 mCrab at week's end
GRO J1655-40 - declined to ~1.07 Crab
IGR J17098-3626 - down to ~15 mCrab
X1745-203 - ~190 mCrab
SAX J1808.4-3658 - down to ~20 mCrab

13 June 2005 --
Week 488 results (2005 June 3 - 9)

X0535+262 - the average of a a low no. of observations (2) indicate a strength of ~1.3 Crab
Cir X-1 - was as strong as 130 mCrab
X1608-522 - decreased to ~170 mCrab
GRO J1655-40 - down to ~1.4 Crab
GRS1737-31 - < 13 mCrab
X1745-203 - ~190 mCrab
SAX J1808.4-3658 - ~50 mCrab

6 June 2005 --
Week 487 results (2005 May 27 - June 2)

X0535+26 - ~800 mCrab on the basis of one observation
Cir X-1 - < 15 mCrab for most of the week
X1608-522 - down to ~230 mCrab
GRO J1655-40 - ~1.85 Crab and decreasing
IGR J17098-3626 - no clear trend is apparent in noisy data
GRS1737-31 - may have increased briefly to ~20 mCrab
X1745-203 (in glob. cluster NGC 6440) - ~140 mCrab
SAX J1808.4-3658 - increased to ~50 mCrab

31 May 2005 --
Week 486 results (2005 May 20 - 26)

X0535+262 - reached ~450 mCrab as it continued to rise
Cir X-1 - mostly below 15 mCrab; this is the weakest 16.6 day cycle in 9+ years
X1608-522 - down to ~260 mCrab as it slowly declines
GRO J1655-40 - near 2.6 Crab
IGR J17098-3626 - down to ~33 mCrab as it slowly decreases in strength
X1745-203 - ~160 mCrab

23 May 2005 --
Week 485 results (2005 May 13 - 19)

X0535+262 - sparse results (because the Sun is nearby in direction at this time of year) indicate that the source could be as strong as 200 mCrab, but this should be regarded as tentative (again, because of possible errors induced by effects of the Sun)
Cir X-1 - < 13 mCrab
X1608-522 - in the range 260 to 330 mCrab as it declines slowly and a bit erratically
GRO J1655-40 - flares to nearly 5 Crab
IGR J17098-3626 - continues near 50 mCrab
X1745-203 - rose rapidly to ~230 mCrab
Aql X-1 - < 10 mCrab

19 May 2005 --
Week 484 results (2005 May 6 - 12)

Neutron-star systems:
X1608-522 - slight decline to 400 mCrab
Aql X-1 - decline to 20 mCrab
Cir X-1 - low but detected at 15 mCrab
EXO2030+375 - small outburst begins to decline, at 50 mCrab
X0535+262 - pulsar brightening to 55 mCrab
Black hole systems:
GRO J1655-40 - flaring to 3-4 Crab, and up to 5 Crab in current week
GRS1915+105 - flaring to 1-3 Crab
GX339-4 - down to 5 mCrab and less than 3 sigma
Other transients:
IGR J17098-3626 - starting to decline, near 50 mCrab
AGN:
Mkn 421 - steady at 12 mCrab
Mkn 501 - 6 mCrab
3C 454.3 - 10 mCrab ; see ATEL 484, a long term outburst reported in VSNET

11 May 2005 --
Week 483 results (2005 April 29 - May 5)

Neutron-star systems:
X1608-522 - average is 450 mCrab, with superburst on May 5 (ATEL #482)
Aql X-1 - still ~30 mCrab
EXO 0748-676 - decreased to 12 mCrab
Cir X-1 - not detected! ... below 4 mCrab
X1730-333 (Rapid Burster) - declining further, below 40 mCrab
Black hole systems:
GRO J1655-40 - still increasing gradually, to ~1.6 Crab
GRS1915+105 - still bright, 1-2 Crab
GX339-4 - down to 8 mCrab... heading into quiescence?
Other transients:
IGR J17098-3626 - still in outburst at 66 mCrab
AGN:
MKN 421 - 12.1 (1.9) mCrab
1ES 1959+650 - 5.0 (1.2) mCrab
3C 273 - 8.5 (1.9) mCrab

3 May 2005 --
Week 482 results (2005 April 22 - 28)

X0614+091 - increased to a level of 70 to 80 mCrab
EXO 0748-676 - continues near 30 mCrab
Cir X-1 - has not exceeded 70 mCrab for over two weeks
X1608-522 - varied erratically in the range 250 to 400 mCrab
GRO J1655-40 - ~1.5 Crab
X1730-333 (Rapid Burster) - in the declining phase of an outburst, and was mostly < 70 mCrab
Aql X-1 - ~30 mCrab
GRS1915+105 - active with flares as strong as 3.5 Crab after roughly 10 weeks with rather low variability

25 April 2005 --
Week 481 results (2005 April 15 - 21)

EXO 0748-676 - continues to appear at intensities of 25 to 30 mCrab
X1608-522 - down to 330 to 430 mCrab (range of variability)
GRO J1655-40 - rose above 1.7 Crab
GX 339-4 - declined to ~15 mCrab or less
X1730-333 (Rapid Burster) - as strong as ~160 mCrab
Aql X-1 - very roughly ~50 mCrab (sparse data)
Cyg X-1 - near ~0.5 Crab with typical high hardness ratios

21 April 2005 --
Week 480 results (2005 April 8 - 14)

V0332+53 - up to ~13 mCrab for a few days
EXO 0748-676 - rose rapidly to ~30 mCrab near the beginning of the week and then remained more or less steady near that strength
X1323-619 - may be up to ~13 mCrab
X1608-522 - down to ~470 mCrab
GRO J1655-40 - up to nearly 1.5 Crab as it steadily increases
GX339-4 - decreased to ~50 mCrab
Aql X-1 - ~80 mCrab
Cyg X-1 - flared to ~2 Crab (this is the end of the flare noted last week)

11 April 2005 --
Week 479 results (2005 April 1 - 7)

X1608-522 - continues to be detected in the vicinity of 600 mCrab
GRO J1655-40 - rose slowly to ~1.1 Crab
X1705-440 - rose to ~350 mCrab
Aql X-1 - rose to ~50 mCrab
Cyg X-1 - flared to ~2 Crab

4 April 2005 --
Week 478 results (2005 March 25 - 31)

X1608-522 - varied in the range 530 to 700 mCrab
GRO J1655-40 - roughly steady near 1 Crab
GX 339-4 - down to ~100 mCrab
X1735-444 - is near ~250 mCrab
EXO 2030+375 - the peak flux of ~25 mCrab during the most recent orbital cycle is the lowest seen in a few years, and reverses the recent trend of increasing strength
1E2259.0+5836 - rose slowly over the last few weeks to ~25 mCrab

28 March 2005 --
Week 477 results (2005 March 18 - 24)

X1608-522 - continues at nearly 500 mCrab
GRO J1655-40 - peaked and then declined to ~1.3 Crab
GX 339-4 - down to ~130 mCrab as it very slowly declines
X1702-429 - up to ~50 mCrab
X1705-440 - rose to ~250 mCrab

21 March 2005 --
Week 476 results (2005 March 11 - 17)

V0332+53 - declined to < 13 mCrab
X0512-401 - continues to be seen near 20 mCrab
X1608-522 - declined from ~640 mCrab to ~470 mCrab
GRO J1655-40 - rose to ~1.7 Crab

15 March 2005 --
Week 475 results (2005 March 4 - 10)

V0332+53 - reversed its decaying trend and increased to ~20 mCrab
X0512-401 - increased a bit to about 20 mCrab
X1608-522 - is in outburst once again, since it increased to ~470 mCrab
GRO J1655-40 - increased to ~200 mCrab

7 March 2005 --
Week 474 results (2005 February 19 - March 3)

V0332+53 - < 10 mCrab
GRO J1008-57 - < 15 mCrab
Cir X-1 - looks exceptionally feeble at ~50 mCrab while in the part of its 16.6 day cycle when it is usually at a high strength

28 February 2005 --
Week 473 results (2005 February 18 - 24)

V0332+53 - < 30 mCrab
X0512-401 - ~13 mCrab
GRO J1008-57- declined from ~30 mCrab to ~13 mCrab
X1953+319 - average intensity is up to ~20 mCrab

22 February 2005 --
Week 472 results (2005 February 11 - 17)

V0332+53 - declined to ~60 mCrab
GRO J1008-57 - rose to ~30 mCrab in the middle of the week and remained close to that strength through the rest of the week (also see ATEL No. 413)
GX339-4 - rather steady near 180 mCrab
X1705-440 - rose to ~130 mCrab
X1905+000 - < 10 mCrab

14 February 2005 --
Week 471 results (2005 February 4 - 10)

V0332+53 - decreased to ~150 mCrab
GX339-4 - more or less steady near ~200 mCrab, spectrum is very soft
X1905+000 - may be ~13 mCrab

7 February 2005 --
Week 470 results (2005 January 28 - February 3)

V0332+53 - decreased to ~230 mCrab
XTE J1118+480 - < 10 mCrab
GX339-4 - ~190 mCrab
X1905+000 - possibly rose to ~18 mCrab
GRS1915+105 - strong, as high as 2 Crab, and highly variable

3 February 2005 --
Week 469 results (2005 January 21 - 27)

V0332+53 - decreased to ~330 mCrab
GX 339-4 - still near 150 mCrab with a soft spectrum
GRS 1915+105 - continues to be more or less steady near 250 mCrab
Cyg X-3 - up to ~200 mCrab

24 January 2005 --
Week 468 results (2005 January 14 - 20)

XTE J1118+480 - faint outburst continues at 15 mCrab (see ATEL #383 and others following)
V0332+53 - decline crosses 400 mCrab
GX 339-4 - decreases to ~150 mCrab
GRS 1915+105 - unusual conditions: faint (250 mCrab) with a soft spectrum (HR2 < 1.0)
Mkn 421 - faint, near 3 mCrab

10 January 2005 --
Week 466 results (2004 December 31 - 2005 January 6)

V0332+53 - is now declining, and was at an intensity just below ~1 Crab (1.5-12 keV)
EXO0748-676 - rose to ~20 mCrab

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