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1 Crab = 74 SSC cts/sec

This is the 2002 archive.

6 January 2003 --

Week 361 results (2002 December 27 - 2003 January 2)

Mkn 421 - ~15 mCrab
X1630-472 - ~330 mCrab
KS 1947+300 - could be up to ~10 mCrab
Cyg X-1 - extremely weak, i.e., as low as 130 mCrab, and rather hard

31 December 2002 --
Week 360 results (2002 December 20 - 26)

Mkn 421 - ~35 mCrab
X1630-472 - looks to be rather strong, i.e., ~600 mCrab, from a small number of observations
GX 339-4 - ~300 mCrab

23 December 2002 --
Week 359 results (2002 December 13 - 19)

Cyg X-3 - ~260 mCrab; may be strengthening slowly

17 December 2002 --
Week 358 results (2002 December 6 - 12)

X1755=338 - a few measurements show the source at ~60 mCrab, but the proximity of the Sun demands that this be taken cautiously
X1957+115 - ~50 mCrab
SAX J2103.5+4545 - ~13 mCrab

9 December 2002 --
Week 357 results (2002 November 29 - December 5)

X Per - 30 mCrab with flares exceeding 100 mCrab
Mkn 421 - weekly average down: 10 +- 1 mCrab
1ES1959+650 - weekly average up: 13 +- 1 mCrab

Note: The Sun is near the Galactic center, so coverage is strongly diminished for southern sources with R.A. ~ 16-18 hr.
2 December 2002 --
Week 356 results (2002 November 22 - 28)

SMC X-1 - the long term cycle is showing a rather short period, ~50 days or less
Mkn 421 - flared over the course of a few days to ~90 mCrab

26 November 2002 --
Week 355 results (2002 November 15 - 21)

X 0352+30 (X Per) - is strengthening very gradually and is now ~40 mCrab
X 1630-472 - still near 250 mCrab
GX 339-4 - 250 to 330 mCrab
Cyg X-3 - daily average intensities declined from ~250 to ~130 mCrab

12 November 2002 --
Week 353 results (2002 November 1 - 7)

Mkn 421 - although the data are noisy, the strength appears to have dropped; it is not consistently as strong as 40 mCrab
X 1630-472 - appears highly variable, i.e., from 0 to ~500 mCrab in relatively noisy data
X 1746-370 - ~40 mCrab
KS 1947+300 - below 10 mCrab

6 November 2002 --
Week 352 results (2002 October 25 - 31)

GX 339-4 - steady at about 350 mCrab
SAX J1808.4-3658 - declined to ~10 mCrab

29 October 2002 --
Week 351 results (2002 October 18 - 24)

Mkn 421 - continues to be in the vicinity of 40 mCrab; this is likely to be accurate rather than an artifact
4U 1705-440 - below 15 mCrab
KS 1947+300 - declined to ~15 mCrab
Cyg X-1 - intensity and hardness ratios indicate that the source has returned to the low hard state

21 October 2002 --
Week 350 results (2002 October 11 - 17)

Mkn 421 - appears to be ~40 mCrab, but a caveat is in order since it is not very far from the Sun
Cen X-3 - is turning back on
X1630-472 - down to ~220 mCrab
GX 339-4 - down to ~400 mCrab
SAX J1808.4-3658 - up to ~80 mCrab
KS 1947+300 - down to ~30 mCrab
Cyg X-1 - continued its recent downward trend in intensity so that it was ~400 mCrab at week's end, and the spectrum continued to become harder

15 October 2002 --
Week 349 results (2002 October 4 - 10)

Cen X-3 - appears to be turning on again with measurements up to ~190 mCrab
X1608-522 - back up to ~25 mCrab
X1630-472 - on the basis of not so good coverage, the source appeared somewhat weaker at about 250 mCrab
GX 339-4 - down to ~470 mCrab
KS 1947+300 - still about 40 mCrab
Cyg X-1 - appeared somewhat weaker than in the last month or so, and the hardnness ratios have increased
Cyg X-3 - rose to ~260 mCrab

7 October 2002 --
Week 348 results (2002 September 27 - October 3)

X1323-619 - appears to be increasing and could be as strong as 25 mCrab
X1608-522 - down to ~13 mCrab
X1630-472 - varied in the range 430 - 570 mCrab
GX 339-4 - down to ~520 mCrab
Cyg X-1 - showed a few day long episode of spectral hardening that may foreshadow a return to the low hard state
Cyg X-3 - also appeared to weaken somewhat and to show a harder spectrum

1 October 2002 --
Week 347 results (2002 September 20 - 26)

X1608-522 - down to ~15 mCrab
X1630-472 - more or less steady near 400 mCrab
GX 339-4 - decreased slowly and steadily to ~600 mCrab
X1730-333 (Rapid Burster) - around 30 mCrab
KS 1947+300 - reached a peak just above 40 mCrab

23 September 2002 --
Week 346 results (2002 September 13 - 19)

4U 0352+30 (X Per) - averaging almost 25 mCrab
LMC X-3 - strengthening to ~25 mCrab
LMC X-1 - appears to be weakening somewhat from ~20 mCrab to ~13 mCrab for the first time in the RXTE 6 year record
X1608-522 - decreased to ~80 mCrab
X1630-472 - levelled off at ~330 mCrab after peaking at almost 500 mCrab
X1636-536 - has been rather low (~65 mCrab) on numerous days in the last few weeks; such a low flux was not seen for the first 5 or more years of the RXTE misssion
X1730-333 (Rapid Burster) - rose from 20 to 40 mCrab
GRS 1747-312 - slowly declined over the last two months and is now < 10 mCrab
KS 1947+300 - rising; already at ~40 mCrab

17 September 2002 --
Week 345 results (2002 September 6 - 12)

X1608-522 - decline continues to 0.15 Crab
X1630-472 - start of 5th outburst (see ATEL #106) reaches 0.4 Crab with relatively hard spectrum
GX 339-4 - fairly steady near 0.75 Crab
X1704+240 - still on at 20 mCrab
X1730-333 (Rapid Burster) - mini-outburst declines to 25 mCrab
GRS 1915+105 - occasional flares to 1.5 Crab
KS 1947+300 - new increase to 13 mCrab
Cyg X-1 - continued bright and soft, with flares to 1.5 Crab
1ES1959+650 - BL Lac outburst down to 5 mCrab

10 September 2002 --
Week 344 results (2002 August 30 - September 5)

X1608-522 - slow decline continues to 0.27 Crab
GX 339-4 - still at 0.75 Crab
X1704+240 - still on at 16 mCrab
X1730-333 (Rapid Burster) - turning on again; 50 mCrab
GRS 1915+105 - flares to 1.4 Crab at week's end
Cyg X-1 - very bright, with flares to 2 Crab
1ES1959+650 - a BL Lac object still in outburst at 7 mCrab

3 September 2002 --
Week 343 results (2002 August 23 - 29)

X Per (X0352+30) - consistently ~20 mCrab
X1323-619 - up to ~20 mCrab
X1608-522 - ~330 mCrab and not declining
GX 339-4 - could be increasing again but this is evident from relatively few observations

26 August 2002 --
Week 342 results (2002 August 16 - 22)

X1323-619 - ~20 mCrab again
X1608-522 - decline continues more or less linearly to ~330 mCrab
GX 339-4 - possibly declining but data are not definitive

19 August 2002 --
Week 341 results (2002 August 9 - 15)

X1608-522 - decreased to ~470 mCrab
GX 339-4 - may be starting to decline very slowly
SAX J1712.6-3739 - may be up above 30 mCrab

12 August 2002 --
Week 340 results (2002 August 2 - 8)

X1608-522 - declined slowly to ~520 mCrab
GX 339-4 - steady at ~0.9 Crab
GRS 1758-258 - consistently around 40-50 mCrab
X1850-087 - down below 10 mCrab
SAX J2103.5+4545 - continues at ~15 mCrab

6 August 2002 --
Week 339 results (2002 July 26 - August 1)

X1543-475 - no longer detected (< 10 mCrab) at end of week
X1608-522 - still very bright at 0.67 Crab
GX339-4 - still very bright at 0.90 Crab
X1704+240 - still 'on' at 25 mCrab
EXO 2030+375 - up to 24 mCrab
Cyg X-1 - continues near 0.75 Crab and soft
1ES1959+650 - continued outburst in this BL Lac, near 10 mCrab

29 July 2002 --
Week 338 results (2002 July 19 - 25)

X1543-475 - down to ~60 mCrab; spectral hardness may be increasing
X1608-522 - is in a bona fide outburst being just above 670 mCrab
XTE J1650-500 - possibly up to ~20 mCrab
GX 339-4 - steady at ~870 mCrab
GRS 1747-312 - appears to be ~25 mCrab
X1953+319 - down to ~13 mCrab

24 July 2002 --
Week 337 results (2002 July 12 - 18)

HD101379 (star w/ active corona) - noisy data suggest possibility of being up to ~20 mCrab
4U 1543-475 - continued decline and was near ~230 mCrab at week's end; the spectrum continues to soften
X1608-522 - up to ~100 mCrab
GX 339-4 - up to ~900 mCrab
EXO 1745-248 (in Terzan 5) - declined to ~25 mCrab
GRS 1747-312 - noisy data suggest possibility of being up to ~20 mCrab
X1850-087 - stable at ~15 mCrab
X1953+319 - ~25 mCrab

15 July 2002 --
Week 336 results (2002 July 5 - 11)

X1323-619 - ~20 mCrab
X1543-475 - declined to ~0.5 Crab
GX339-4 - up to ~750 mCrab; the spectrum became a bit less soft
X1728-34 (GX354-0) - was unusually low at < 30 mCrab
EXO1745-248 (in globular cluster Terzan 5) - is in outburst at ~130 mCrab
X1850-087 - down to ~13 mCrab
X1953+319 - up to ~40 mCrab
Cep X-4 - below detection threshold , i.e., < 10 mCrab

8 July 2002 --
Weeks 334 and 335 results (2002 June 21 - July 4)

4U 1543-475 - decreased more or less smoothly to ~1.5 Crab, but some hardness variations are apparent
X1608-522 - variable strength increasing to ~60 mCrab at the end of week 335
GX 339-4 - increased steadily reaching ~670 mCrab at the end of week 335 and the spectrum continues to soften
X1704+240 - rose to ~25 mCrab
4U 1705-440 - up to ~260 mCrab
SL1735-269 - < 10 mCrab
GRS1758-258 - roughly 50 mCrab
X1850-087 - down to ~25 mCrab
Cep X-4 - < 10 mCrab

24 June 2002 --
Week 333 results (2002 June 14 - 20)

4U 1543-475 - as reported last week, this source went into outburst this week and has now reached a peak flux of ~4 Crab
X1636-536 - dipped to a very low level, ~50 mCrab, for the last 3 days of the week
GX 339-4 - near 530 mCrab and slowly increasing while the spectrum continues to soften
4U 1705-440 - increased to ~210 mCrab
X1728-34 (GX 354-0) - up to ~110 mCrab
SL1735-269 - above 25 mCrab for much of the week
GRS1758-258 - ~35 mCrab
SAX J2103.5+4545 - variable up to ~25 mCrab
Cep X-4 - decreased slightly to ~20 mCrab

17 June 2002 --
Week 332 results (2002 June 7 - 13)

Gamma Cas - somewhat higher than usual at ~15 mCrab
XTE J0929-314 - < 10 mCrab
X1608-522 - ~50 mCrab
GX 339-4 - fairly steady at ~450 mCrab
X1850-087 - still very high being just above 50 mCrab
X1908+094 - now below 10 mCrab
SS433 - ~15 mCrab
Cep X-4 - still ~25 mCrab

Note: 4U 1543-475 has gone into outburst within the last day (this is in week 333) and is now over 1.5 Crabs in strength.
10 June 2002 --
Week 331 results (2002 May 31 - June 6)

X1608-522 -still somewhat active with daily averages sometimes as high as 50 mCrab
GX 339-4 - declined a bit to ~460 mCrab
X1702-429 - up to ~50 mCrab
X1850-087 (in globular cluster NGC 6712) - at an ASM record high of 40 to 50 mCrab
KS 1947+300 - declined to < 10 mCrab
SAX J2103.5+4545 - above 15 mCrab
Cep X-4 - up to 25 mCrab

3 June 2002 --
Week 330 results (2002 May 24 - 30)

X1145-616 - possibly a bit stronger than usual at ~13 mCrab
X1145-619 - may have been as high as 25 mCrab for a few days in the middle of the week
4U1608-522 - still active at ~25 mCrab
GX 339-4 - declined but still above 500 mCrab
X1730-333 (Rapid Burster) - below 10 mCrab in the latter half of the week
X1850-087 - consistently at or just above 25 mCrab
X1908+094 - slowly declining and now at about 15 mCrab
GRS 1915+105 - back to a modest flux (500 mCrab) steady state
Cyg X-1 - still in the high/soft state and showing very strong flares as high as 2 Crab

31 May 2002 --
Week 329 results (2002 May 17 - 23)

XTE J0929-314 - remains close to ~13 mCrab
GX 339-4 - decreased to ~630 mCrab without much change in the spectrum
GX 3+1 - around 330 mCrab
V4641 Sgr - could be up to ~15 mCrab
X1850-087 - could be up to 20 mCrab, record strength in the ASM light curve
GRS 1915+105 - active again with flares to above 2 Crab
Cyg X-3 - less strong and active at ~100 mCrab

20 May 2002 --
Week 328 results (2002 May 10 - 16)

XTE J0929-314 - steady at ~13 mCrab
X1608-522 - ~40 mCrab and showed possible evidence of one X-ray burst
4U 1636-536 - relatively weak being as low as ~80 mCrab at week's end
GX 339-4 - rose strongly to ~800 mCrab, and the spectrum softened, but not to the level of the earlier outburst
GX 3+1 - rose to ~490 mCrab

13 May 2002 --
Week 327 results (2002 May 3 - 9)

XTE J0929-314 - down to ~13 mCrab
HD101379 - possibly up to ~10 mCrab
X1608-522 - decreased to ~20 mCrab
GX339-4 - rose sharply to ~530 mCrab, and HR2 (5-12 keV/3-5 keV) is dropping, i.e., the spectrum softened somewhat
X1730-333 (Rapid Burster) - data are noisy, but still indicate that the source is weak now

6 May 2002 --
Week 326 results (2002 April 26 - May 2)

XTE J0929-314 - This newly found transient (IAU Circ. No. 7888) has a strength of ~25 mCrab
Cen X-3 - is back at ~130 mCrab when out of eclipse
X1608-522 - an outburst has begun with an increase to a strength of ~70 mCrab
GX 339-4 - ~350 mCrab; also note that the spectrum is dramatically harder during this outburst in comparison with that in the previous outburst
SAX J1712.6-3739 - was around 40 mCrab for most of the week
X1730-333 (Rapid Burster) - down to ~40 mCrab with many fwer indications of burst activity
KS 1947+300 - leveled off at ~25 mCrab

30 April 2002 --
Week 325 results (2002 April 19 - 25)

GX339-4 - leveled off at ~320 mCrab
X1730-333 (Rapid Burster) - continues to be active with bursts and persistent emission, although there is an indication that this declines near the end of the week
SAX J1747.0-2853 - persists at ~20 mCrab
XTE J1908+094 - steady at ~45 mCrab
GRS 1915+105 - back to a steady mode at ~500 mCrab
KS 1947+300 - rose to 20 mCrab

22 April 2002 --
Week 324 results (2002 April 12 - 18)

GX 339-4 - up to ~290 mCrab
X1730-333 (the Rapid Burster) - is active again with steady flux of ~60 mCrab and many bursts as evident in a number of high 90 s intensities
XTE J1751-305 - decreased below 10 mCrab
XTE J1908+094 - decreased to ~50 mCrab

16 April 2002 --
Week 323 results (2002 April 5 - 11)

X0512-401 - <10 mCrab
GX 339-4 - rose to 240 mCrab
XTE J1751-305 - ~33 mCrab
SAX J1805.5-2031 - ~15 mCrab
XTE J1908+094 - varied in the range 50 - 75 mCrab

8 April 2002 --
Week 322 results (2002 March 29 - April 4)

X0512-401 - was below 10 mCrab
X1657-415 - was variable with intensity as high as ~65 mCrab
GX339-4 - is on the rise again and was up to ~90 mCrab at week's end
SAX J1712.6-3739 - may be up to 20 mCrab
SAX J1805.5-2031 - down to ~13 mCrab
XTE J1908+094 - about 50 mCrab
GRS 1915+105 - showed episodes of particular strength and activity (up to 2 Crab)
X1953+319 - ~30 mCrab

1 April 2002 --
Week 321 results (2002 March 22 - 28)

X0512-401 (in NGC 1851) - decreased to ~10 mCrab
Cen X-3 - is increasing in strength; up to ~150 mCrab
SGR 1900+14 - the light curve has been revised with the addition of XTE J1908+094 to the ASM catalog; the possible emission noted for week 319 is no longer present
XTE J1908+094 - ~40 mCrab
Aql X-1 - decreased to a level below 10 mCrab
GRS 1915+105 - is beginning to increase after nearly 30 days at ~500 mCrab

25 March 2002 --
Week 320 results (2002 March 15 - 21)

X0512-401 (in globular cluster NGC 1851) - ~25 mCrab
LMC X-3 - down to ~13 mCrab
XTE J1908+094 - Preliminary analysis of ASM data show emission increasing over 4 or 5 weeks to ~60 mCrab, consistent with that seen by the PCA (see IAU Circular 7856). The appearance of this source is likely the cause of the elevated flux from SGR1900+14 reported a week ago. Reanalysis of the ASM data will clarify this.
Aql X-1 - down to ~90 mCrab
GRS 1915+105 - a long interval of very steady emission at ~0.5 Crab continues

18 March 2002 --
Week 319 results (2002 March 8 - 14)

GK Per - up to ~10 mCrab
X Per - continues to increase in strength slowly and is now near 25 mCrab
X0512-401 - still at about 20 mCrab
Cen X-3 - is showing signs of activity with a daily average intensity as high as 80 mCrab
X1657-415 - up to ~50 mCrab
SGR 1900+14 - ~20 mCrab (this is the highest level seen for this source by the ASM, but caution is in order since it may be from confusion with a nearby transient)
Aql X-1 - remains near 130 mCrab
KS 1947+300 - ~15 mCrab

11 March 2002 --
Week 318 results (2002 March 1 - 7)

X0512-401 - could be up to 20 mCrab
X1145-616 - looks to be ~13 mCrab
X1246-588 - around 17 mCrab
X1323-619 - ~15 mCrab
RX J1709.5-2639 - down to ~15 mCrab
GCX-1 - ~40 mCrab
SAX J1805.5-2031 - ~40 mCrab
Aql X-1 - about the same intensity as last week
KS1947+300 - ~13 mCrab

4 March 2002 --
Week 317 results (2002 February 22 - 28)

X1323-619 - up to ~20 mCrab
RX J1709.5-2639 - down to ~40 mCrab
GRS 1747-312- ~20 mCrab
Aql X-1 - up to ~170 mCrab

22 February 2002 --
Week 316 results (2002 February 15 - 21)

X Per - for at least a few weeks has been consistently strong at ~15 mCrab (compare with the ASM historical average of ~10 mCrab)
RX J1709.5-2639 - ~65 mCrab, slowly declining in strength
X1708-407 - still near 40 mCrab
Aql X-1 - rose to ~100 mCrab
Cyg X-3 - is strong and variable in the range 130 to 650 mCrab

19 February 2002 --
Week 315 results (2002 February 8 - 14)

XTE J1550-564 - <13 mCrab
X1556-605 - at ~25 mCrab may be 25% higher than its long term average intensity
4U 1705-440 - ~150 mCrab
RX J1709.5-2639 - ~80 mCrab
GRS 1758-258 - at ~50 mCrab relatively strong but not at an unprecedented level
GRS1915+105 - steady at ~0.6 Crab

11 February 2002 --
Week 314 results (2002 February 1 - 7)

4U 1705-440 - is rising again and is now above 100 mCrab
EXO 2030+375 - is low again, < 13 mCrab

4 February 2002 --
Week 313 results (2002 January 25 - 31)

X1636-536 - rose to ~160 mCrab
RXJ1709.5-2639 - was in the range 80 to 120 mCrab
X1708-407 - ~40 mCrab
EXO 2030+375 - up to ~25 mCrab
Cyg X-3 - stronger and more active at ~250 mCrab

29 January 2002 --
Week 312 results (2002 January 18 - 24)

X1145-616 - the results suggest that this source may be up to ~25 mCrab
XTE J1550-564 - declined to roughly 20 mCrab
X1636-536 - is very weak at roughly 40 mCrab; this is the lowest intensity (averaged over a few days) so far in the ASM record
RX J1709.5-2639 - variable in the range 80 to 140 mCrab
RX J1710.2-2808 - possibly up to 20 mCrab
SAX J1747.0-2853 - appears to be ~25 mCrab

22 January 2002 --
Week 311 results (2002 January 11 - 17)

XTE J1550-564 - about 50 mCrab and possibly declining
XTE J1650-500 - intensity is below 30 mCrab and is consistent with no detected flux
RX J1709.5-2639 - some strong intensities are indicated, i.e., ~130 mCrab, but this result must be regarded as tentative because of the possibility of solar contamination; follow up by other instruments would be useful

14 January 2002 --
Week 310 results (2002 January 4 - 10)

XTE J1550-564 - may be up to ~65 mCrab (on basis of relatively few observations)
X1636-536 - rather weak at ~80 mCrab
Cyg X-1 - remains relatively strong and active with flares to as high as 1.5 Crab
Cyg X-3 - rising in strength; is up to at least 200 mCrab and may be up to > 250 mCrab
SAX J2103.5+4545 - may have been above 20 mCrab for most of a week
X2206+543 - seems to be somewhat stronger than usual being in the range 10 to 15 mCrab

7 January 2002 --
Week 309 results (2001 December 28 - 2002 January 3)

Cyg X-3 - is increasing in strength and is up to ~170 mCrab

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