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1 Crab = 74 SSC cts/sec

This is the 2004 archive.

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

4 January 2005 --
Week 465 results (2004 December 24 - 30)

V0332+53 - remained near 1.15 Crab
GX 339-4 - decreased to ~200 mCrab
X1907+097 - possibly reached 40 mCrab for a few days (caveat: the data appear somewhat noisy - the apparent strength could be an artifact of systematic errors)
GRS 1915+105 - dropped suddenly to ~260 mCrab
KS 1947+300 - may have risen to ~30 mCrab (caveat applies to this result also)

27 December 2004 --
Week 464 results (2004 December 17 - 23)

V0332+53 - rose to ~1.2 Crab (1.5-12 keV), but since the spectrum is much harder than that of the Crab Nebula, the intensity rose to ~2.2 Crab in the 5-12 keV band
LMC X-3 - up to ~25 mCrab
1ES0821-426 - possibly rose to ~13 mCrab

20 December 2004 --
Week 463 results (2004 December 10 - 16)

IGR J00291+5934 - declined below 10 mCrab
V0332+53 - rose to approximately 1 Crab. The spectrum is much harder than that of the Crab Nebula. Since the gain of SSC 1 (numbered on a 1-3 basis) is much different from the gains of the other 2 SSCs and the calibration of the SSC 1 results is dependent on the source spectrum, the intensities derived from SSC 1 observations are too low.
GRO J0422+32 - may have risen to ~13 mCrab for a few days
Mkn 421 - ~25 mCrab
GX 339-4 - ~260 mCrab

14 December 2004 --
Week 462 results (2004 December 3 - 9)

IGR J00291+5934 - reached a peak intensity of ~20 mCrab and now appears to be declining (This is a newly discovered transient showing 598 Hz pulsations; see The Astronomer's Telegram nos. 352, 353, 357 and others at http://www.astronomerstelegram.org/)
V0332+53 - increased to ~350 mCrab
X0614+091 - relatively strong with daily averages as strong as ~100 mCrab
EXO0748-676 - rose to ~20 mCrab
IGR J16318-4848 - up to ~20 mCrab
X1630-472 - ~13 mCrab
GRS1915+105 - nearly 2 Crabs

6 December 2004 --
Week 461 results (2004 November 26 - December 2)

V0332+53 - continued to rise rapidly; reached a strength of ~250 mCrab
X1556-605 - may have increased to ~40 mCrab
X1630-472 - ~15 mCrab
GX339-4 - declined to ~330 mCrab
GRS1716-249 - may have had a small transient outburst and peaking at ~80 mCrab (but this and other results on Galactic bulge sources should be treated cautiously while the Sun passes through the general region of the sky)
X1730-333 (Rapid Burster) - continues to appear to be in a weak outburst (but see caveat above)

29 November 2004 --
Week 460 results (2004 November 19 - 25)

V0332+53 - rose over the last few days of the week to ~65 mCrab
Mkn 421 - varied in the range 13 to 25 mCrab
X1730-333 (Rapid Burster) - may be in outburst again, but the proximity of the Sun leaves room for doubt

15 November 2004 --
Week 458 results (2004 November 5 - 11)

LMC X-3 - < 10 mCrab
Cen X-3 - has been consistently, outside of eclipse, in the range 200 to 300 mCrab
Cyg X-1 - active but maintaining a hard spectrum

8 November 2004 --
Week 457 results (2004 October 29 - November 4)

EXO 2030+375 - up to ~47 mCrab; this is one of the usual cyclically occurring (every ~45 days) episodes which have recently been stronger than they were earlier in the mission

2 November 2004 --
Week 456 results (2004 October 22 - 28)

EXO 0748-676 - could be up to ~25 mCrab
X1246-588 - up to ~15 mCrab
X1630-472 - down to ~70 mCrab
H1743-322 - < 13 mCrab

25 October 2004 --
Week 455 results (2004 October 15 - 21)

X0115+634 - declined to <10 mCrab
X1630-472 - steady near 100 mCrab
GX 339-4 - more or less steady near 440 mCrab
H1743-322 - ~13 mCrab
Cyg X-1 - intensity decreased to the range 0.25 to 0.9 Crab and the spectrum became noticeably harder

18 October 2004 --
Week 454 results (2004 October 8 - 14)

X0115+634 - declined to ~15 mCrab
Cir X-1 - suddenly rose to ~670 mCrab near phase 0 of the 16.6 d cycle
X1630-472 - slowly decreasing near 100 mCrab
GX339-4 - ~450 mCrab and continuing on a slow linear upward trend
H1743-322 - ~20 mCrab
AX J1820.5-1434 - variable (15 to 40 mCrab) with some evidence of stronger (500 mCrab in a 90 s average) burstlike events
KS1947+300 - ~13 mCrab

12 October 2004 --
Weeks 452 and 453 results (2004 September 24 - October 7)

X0115+634 - declined to ~70 mCrab
LMC X-3 - ~10 mCrab
Cir X-1 - is in an extended interval ( > 10 days) of low strength, <20 mCrab
X1630-472 - appears, on the basis of relatively few observations, to have risen to ~150 mCrab over the last 2 weeks
Her X-1 - showed a relatively strong "low-on" state (peak ~25 mCrab)
GX 339-4 - ~420 mCrab (but the individual energy bands and the hardness ratios tell a different story than the 1.5 - 12 keV band strength)
X1702-429 - ~50 mCrab
H1743-322 - declined below 10 mCrab and then increased to ~50 mCrab
KS1947+300 - could be up to ~13 mCrab
Cyg X-1 - continues in high soft state with daily average reaching nearly 1 Crab

27 September 2004 --
Week 451 results (2004 September 17 - 23)

X0115+634 - the daily average intensity decreased to ~150 mCrab
X1916-053- ~20 mCrab

20 September 2004 --
Week 450 results (2004 September 10 - 16)

X0115+634 - ~250 mCrab in most of the daily averages
H1743-322 - ~220 mCrab (but only on the basis of a few measurements)
Cyg X-3 - daily averages are still near 170 mCrab

13 September 2004 --
Week 449 results (2004 September 3 - 9)

X0115+634 - up to ~190 mCrab
X1630-472 - limited data indicate the strength remains near 60 mCrab
GX 339-4 - still ~260 mCrab
x1708-407 - was as strong as 50 to 60 mCrab for at least part of the week
X1916-053 - ~20 mCrab
Cyg X-3 - up to ~180 mCrab

8 September 2004 --
Week 448 results (2004 August 27 - September 2)

XTE J0111-733 - possibly up to ~13 mCrab
X0115+634 - rose to ~65 mCrab
Cir X-1 - up to (merely) ~80 mCrab
Her X-1 - daily average intensity was as high as 25 mCrab as part of a mid-35d-cycle on state

1 September 2004 --
Week 447 results (2004 August 20 - 26)

X Per (= X0352+31) - appears to be quite variable over the last few weeks, ranging from being very weak (< 10 mCrab) to ~30 mCrab.
Cir X-1 - remains very weak, i.e., < 80 mCrab
X1630-47 - ~65 mCrab
X1636-536 - rose to ~130 mCrab
GX 339-4 - in the range 200 to 260 mCrab
H1743-322 - more or less steady near ~260 mCrab

31 August 2004 --
Week 446 results (2004 August 13 - 19)

X1630-472 - appears to be quickly fading to 80 mCrab; data yield is decreasing as Sun approaches field
Her X-1 - starts at 60 mCrab but fades below threshold (~7 mCrab) at week's end
GX 339-4 - further brightening to 200 mCrab
H1743-322 - average flux remains near 200 mCrab

16 August 2004 --
Week 445 results (2004 August 6 - 12)

Cir X-1 - very weak, < 25 mCrab, most likely caused by an extra long absorption event
X1630-472 - more variability in strength than in recent weeks with daily averages from as low as 80 mCrab to as high as 220 mCrab
Her X-1 - up to 50 mCrab
GX 339-4 - up to ~130 mCrab
GS 1826-238 - the persistent flux has gradually strengthened over the mission; in the last week the source strengthened to ~65 mCrab

9 August 2004 --
Week 444 results (2004 July 30 - August 5)

Cir X-1 - peak and average intensity (~70 mCrab) over the current 16.6 d cycle are weaker (by a factor of 2 or so) than in any earlier cycle monitored with the ASM
X1630-472 - continues to be near 260 mCrab
H1743-322 - slightly stronger than last week, at ~220 mCrab
X1916-053 - almost 25 mCrab

2 August 2004 --
Week 443 results (2004 July 23 - 29)

X1704+240 - ~13 mCrab
H1743-322 - continues at a nearly constant level of ~200 mCrab
X1916-053 - ~20 mCrab
Cyg X-1 - strengthened to ~670 mCrab w/ spectral softening

26 July 2004 --
Week 442 results (2004 July 16 - 22)

EXO 0748-676 - as strong as 25 mCrab for much of the week
GX 339-4 - rose slowly to ~70 mCrab
H1743-322 - ~200 mCrab

19 July 2004 --
Week 441 results (2004 July 9 - 15)

Her X-1 - was as strong as ~30 mCrab for much of the week
GX 339-4 - rose to ~55 mCrab
H1743-322 - more or less steady at ~180 mCrab

12 July 2004 --
Week 440 results (2004 July 2 - 8)

X1608-522 - temporarily rose to ~90 mCrab and 1 X-ray burst may have been detected
X1704+240 - ~13 mCrab
H1743-322 - rose to ~120 mCrab

6 July 2004 --
Week 439 results (2004 June 25 - July 1)

1ES0821-426 - possibly at ~15 mCrab
X1630-472 - rose gradually to ~260 mCrab
X1730-333 (Rapid Burster) - rose to ~18 mCrab
GRS 1758-258 - ~40 mCrab

28 June 2004 --
Week 438 results (2004 June 18 - 24)

X0918-548 - continues at roughly 13 mCrab
GRO J1008-57 - < 13 mCrab
Aql X-1 - < 15 mCrab

21 June 2004 --
Week 437 results (2004 June 11 - 17)

X0918-548 - ~13 mCrab
GRO J1008-57 - about 18 mCrab
Aql X-1 - after peaking at ~260 mCrab the intensity dropped to ~65 mCrab
Cyg X-3 - rose in strength to ~250 mCrab and then decreased to ~80 mCrab

14 June 2004 --
Week 436 results (2004 June 4 - 10)

EXO 0748-676 - near 25 mCrab
GRO J1008-57 - possibly up to 13 mCrab
Her X-1 - there is a hint of a comeback ( > 25 mCrab) for a few days near MJD 53162
X1728-34 (GX 354-0) - up to ~260 mCrab
Aql X-1 - rose sharply to 260 mCrab

7 June 2004 --
Week 435 results (2004 May 28 - June 3)

EXO 0748-676 - rose to nearly 25 mCrab
Mkn 421 - less than 10 mCrab
X1630-472 - ~180 mCrab
X1704+240 - ~15 mCrab

1 June 2004 --
Week 434 results (2004 May 21 - 27)

Mrk 421 - <= 10 mCrab
X1323-619 - ~12 mCrab
X1608-522 - ~30 mCrab
X1724-307 - declined from ~60 mCrab to ~30 mCrab
SL 1744-300 - possibly near 25 mCrab
Aql X-1 - rose slowly to ~80 mCrab
X2127+119 - ~13 mCrab

24 May 2004 --
Week 433 results (2004 May 14 - 20)

X1323-619 - ~15 mCrab
X1608-522 - ~25 mCrab
X1630-472 - rose to ~210 mCrab
X1724-307 - ~65 mCrab

17 May 2004 --
Week 432 results (2004 May 7 - 13)

X1630-472 - still more or less steady at ~130 mCrab
X1636-536 - ~20 mCrab
GX339-4 - still about 25 mCrab
X1724-307 - ~50 mCrab
XTE J1858+034 - could be up to ~15 mCrab
Aql X-1 - ~40 mCrab
GRS 1915+105 - returned to flaring behavior (in one observation up to 2.5 Crab) after ~65 days in a less variable state

11 May 2004 --
Week 431 results (2004 April 30 - May 6)

X0614+091 - as high as 80 mCrab
Mkn 421 - ~25 mCrab
X1636-536 - < ~20 mCrab (very weak for this source)
X1850-087 - rose to ~25 mCrab
Aql X-1 - up to ~30 mCrab
Cyg X-3 - at or above 130 mCrab

11 May 2004 --
Week 431 results (2004 April 30 - May 6)

X0614+091 - as high as 80 mCrab
Mkn 421 - ~25 mCrab
X1636-536 - < ~20 mCrab (very weak for this source)
X1850-087 - rose to ~25 mCrab
Aql X-1 - up to ~30 mCrab
Cyg X-3 - at or above 130 mCrab

3 May 2004 --
Week 430 results (2004 April 23 - 29)

EXO 0748-676 - still about 20 mCrab
SAX J1747.0-2853 - back up to ~60 mCrab
KS 1947+300 - < 10 mCrab

26 April 2004 --
Week 429 results (2004 April 16 - 22)

EXO 0748-676 - ~20 mCrab
Mkn 421 - still strong at ~50 mCrab
X1608-522 - decreased to less than 13 mCrab
X1630-472 - ~160 mCrab
X1850-087 - up to ~13 mCrab
Aql X-1 - ended week below 10 mCrab

20 April 2004 --
Week 428 results (2004 April 9 - 15)

EXO 0748-676 - may be up to ~20 mCrab
Mkn 421 - ~45 mCrab
X1608-522 - ~15 mCrab
GX339-4 - ~45 mCrab
X1730-333 (Rapid Burster) - declined to ~50 mCrab
SAX J1747.0-2853 - declined to < 50 mCrab
KS 1947+300 - still ~33 mCrab

12 April 2004 --
Week 427 results (2004 April 2 - 8)

LMC X-3 - ~50 mCrab
Mkn 421 - 50 to 60 mCrab
X1608-522 - down to ~15 mCrab
X1630-472 - up to ~130 mCrab
X1730-333 (Rapid Burster) - up to nearly 200 mCrab
SAX J1747.0-2853 - down to ~50 mCrab
XTE J1751-305 - possibly up to 40 mCrab
Aql X-1 - down to ~13 mCrab
KS 1947+300 - ~35 mCrab

5 April 2004 --
Week 426 results (2004 March 26 - April 1)

LMC X-3 - rose to ~40 mCrab
Mkn 421 - flare peaked at ~80 mCrab
X1608-522 - ~30 mCrab
X1630-472 - steady at ~70 mCrab
GX 339-4 - continues at ~50 mCrab
X1724-307 - ~15 mCrab
X1728-337 (GX354-0) - 130 to 180 mCrab
SAX J1747.0-2853 - 50 to 120 mCrab
GRS1747-312 - ~25 mCrab
Aql X-1 - declined to ~13 mCrab
KS 1947+300 - up to ~28 mCrab

30 March 2004 --
Week 425 results (2004 March 19 - 25)

LMC X-2 - may have been < 10 mCrab for ~4 days
X1608-522 - declined from 260 mCrab to ~30 mCrab
X1630-472 - rose to ~60 mCrab
GX 339-4 - definitely continues at ~60 mCrab
X1705-440 - ~300 mCrab
SAX J1747.0-2853 - ~110 mCrab (see ATEL Nos. 255 and 256 via http://www.astronomerstelegram.org/)
KS 1947+300 - ~13 mCrab

22 March 2004 --
Week 424 results (2004 March 12 - 18)

UX Ari - may have risen to ~20 mCrab for ~2 days
Mkn 421 - very active, varying in the range 20 to 80 mCrab
X1608-522 - rose to ~260 mCrab
GX 339-4 - possibly up to ~60 mCrab (but could be noise artifacts)
GRS 1915+105 - HR 2 rose to a record high (~3) while the overall intensity (1.5-12 keV) stays near 0.5 Crab

15 March 2004 --
Week 423 results (2004 March 5 - 11)

Mkn 421 - 25 to 45 mCrab
NGC 4151 - ~13 mCrab
Aql X-1 - ~45 mCrab

8 March 2004 --
Week 422 results (2004 February 27 - March 4)

Mkn 421 - varied in the range 13 to 45 mCrab
NGC 4388 - possibly ~10 mCrab
Cir X-1 - the maximum intensity seen during the current 16.6 day cycle is rather low, ~300 mCrab
X1705-440 - up to ~130 mCrab
Aql X-1 - ~50 mCrab
GRS 1915+105 - flaring to as high as ~3 Crab

1 March 2004 --
Week 421 results (2004 February 20 - 26)

LMC X-3 - continues to be very weak, <10 mCrab
Cen X-3 - has been weak with flaring episodes to as high 0.3 Crab every few days
X1630-472 - declined to ~20 mCrab
x1850-087 - rose to ~70 mCrab
Aql X-1 - 50 to 70 mCrab

23 February 2004 --
Week 420 results (2004 February 13 - 19)

X1246-588 - ~13 mCrab
X1630-472 - relatively steady near 80 mCrab
X1724-307 - rose to ~60 mCrab (highest flux for this source in the ASM record)
X1850-087 - ~40 mCrab
Aql X-1 - still ~40 mCrab

17 February 2004 --
Week 419 results (2004 February 6 - 12)

Mkn 421 - ~25 mCrab
Cen X-3 - appears as strong as ~260 mCrab
X1246-588 - possibly up to ~13 mCrab
X1323-619 - up to ~15 mCrab
X1630-472 - declining, possibly rapidly, to 70 - 100 mCrab
Aql X-1 - 25 to 60 mCrab

9 February 2004 --
Week 418 results (2004 January 30 - February 5)

X0656-072 - there is a hint of an increase to > 10 mCrab
X1630-472 - decreased to ~130 mCrab
X1724-307 - ~30 mCrab

2 February 2004 --
Week 417 results (2004 January 23 - 29)

LMC X-3 - continues to be very weak, < 10 mCrab
X1630-472 - 190 to 260 mCrab
X1724-307 - looks strong (~80 mCrab) in noisy data
X1744-361 - < 15 mCrab
Cyg X-1 - becoming weaker and harder but not fully back to the low hard state

26 January 2004 --
Week 416 results (2004 January 16 - 22)

X0656-072 - < 10 mCrab
Mkn 421 - 15 to 20 mCrab

22 January 2004 --
Week 415 results (2004 January 9 - 15)

X0656-072 - ~10 mCrab
X1323-619 - ~15 mCrab
X1630-472 - leveled off at ~200 mCrab
X1744-361 - ~60 mCrab

12 January 2004 --
Week 414 results (2004 January 2 - 8)

X0614+091 - varied from ~100 mCrab down to ~25 mCrab
X0656-072 - down to about 10 mCrab
X0836-429 - 15 to 20 mCrab
X1323-619 - ~15 mCrab
X1630-472 - increased to ~200 mCrab
Cyg X-1 - still in high soft state

5 January 2004 --
Week 413 results (2003 December 26 - 2004 January 1)

LMC X-3 - < 10 mCrab
X0656-072 - steady at ~25 mCrab
X0836-429 - >~13 mCrab
X1630-472 - roughly 60 mCrab
Cyg X-1 - increased strongly with a flare reaching nearly 2.0 Crab and with hardness ratios decreasing

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