HEASARC Bibliography


NuSTAR ATel Publications


  1. Reflection features in the hard state brightening of 4U 1543-475
    First Author: Mastroserio, Guglielmo
    The Astronomer's Telegram, No. 15261
    Publication Date: Mar 2022
    Bibliographic Code: 2022ATel15261....1M
    Citations: 0
    ObsIDs in HEASARC

  2. AT2019cuk/SDSSJ1430/ZTF18aarippg: High-cadence NICER and NuSTAR X-ray observations of the potential supermassive black hole binary with imminent merger (the tick-tock source)
    First Author: Pasham, Dheeraj
    The Astronomer's Telegram, No. 15225
    Publication Date: Feb 2022
    Bibliographic Code: 2022ATel15225....1P/
    Citations: 0
    ObsIDs in HEASARC

  3. NuSTAR observation of AT2022cmc, and joint spectral fitting with NICER
    First Author: Yao, Yuhan
    The Astronomer's Telegram, No. 15230
    Publication Date: Feb 2022
    Bibliographic Code: 2022ATel15230....1Y
    Citations: 0
    ObsIDs in HEASARC

  4. NICER and NUSTAR discovery of an extremely deep cyclotron resonant scattering feature in the Be/X-ray binary GRO J1750-27
    First Author: Malacaria, C.
    The Astronomer's Telegram, No. 15241
    Publication Date: Feb 2022
    Bibliographic Code: 2022ATel15241....1M
    Citations: 0
    ObsIDs in HEASARC

  5. NuSTAR identified MAXI J0709-159 as a Be X-ray binary with LY CMa
    First Author: Negoro, H.
    The Astronomer's Telegram, No. 15193
    Publication Date: Feb 2022
    Bibliographic Code: 2022ATel15193....1N
    Citations: 0
    ObsIDs in HEASARC

  6. A possible discovery of AGN during a NuSTAR calibration observation
    First Author: Tumer, Aysegul
    The Astronomer's Telegram, No. 15171
    Publication Date: Jan 2022
    Bibliographic Code: 2022ATel15171....1T
    Citations: 0
    ObsIDs in HEASARC

  7. Dwarf Nova AT2021afpi: X-ray Observations
    First Author: Fox, Derek B.
    The Astronomer's Telegram, No. 15087
    Publication Date: Dec 2021
    Bibliographic Code: 2021ATel15087....1F
    Citations: 0
    ObsIDs in HEASARC

  8. NuSTAR observations of the blazar PKS 0735+178
    First Author: Feng, Qi
    The Astronomer's Telegram, No. 15113
    Publication Date: Dec 2021
    Bibliographic Code: 2021ATel15113....1F
    Citations: 0
    ObsIDs in HEASARC

  9. eRASSU J050810.4-660653 in the LMC: Discovery of X-ray pulsations with XMM-Newton and NuSTAR
    First Author: Haberl, F.
    The Astronomer's Telegram, No. 15133
    Publication Date: Dec 2021
    Bibliographic Code: 2021ATel15133....1H
    Citations: 0
    ObsIDs in HEASARC

  10. NuSTAR observations of a type-I X-ray burst and preliminary pulse detection identify SAX J1748.9-2021 in outburst
    First Author: Pike, Sean
    The Astronomer's Telegram, No. 15048
    Publication Date: Nov 2021
    Bibliographic Code: 2021ATel15048....1P
    Citations: 0
    ObsIDs in HEASARC

  11. NuSTAR, NICER and optical observation of RS Oph.
    First Author: Luna, G. J. M.
    The Astronomer's Telegram, No. 14872
    Publication Date: Aug 2021
    Bibliographic Code: 2021ATel14872....1L
    Citations: 0
    ObsIDs in HEASARC

  12. NuSTAR Observation of MAXI J1803-298 with Periodic Dips
    First Author: Xu, Yanjun
    The Astronomer's Telegram, No. 14609
    Publication Date: May 2021
    Bibliographic Code: 2021ATel14609....1X
    Citations: 0
    ObsIDs in HEASARC

  13. NuSTAR observation during the fading outburst of the new BeXRB MAXI J0901-531
    First Author: Thalhammer, P.
    The Astronomer's Telegram, No. 14604
    Publication Date: May 2021
    Bibliographic Code: 2021ATel14604....1T
    Citations: 0
    ObsIDs in HEASARC

  14. Early NuSTAR and Swift X-ray detection of Nova Cassiopeiae 2021 = V1405 Cas = PNV J23244760+6111140
    First Author: Sokolovsky, K. V.
    The Astronomer's Telegram, No. 14530
    Publication Date: May 2021
    Bibliographic Code: 2021ATel14530....1S
    Citations: 0
    ObsIDs in HEASARC

  15. Detection of Low Frequency QPO in GX 339-4 with NuSTAR
    First Author: Mastroserio, Guglielmo
    The Astronomer's Telegram, No. 14484
    Publication Date: May 2021
    Bibliographic Code: 2021ATel14484....1M
    Citations: 0
    ObsIDs in HEASARC

  16. SRG/ART-XC and NuSTAR observations of the Be X-ray pulsar Swift J1626.6-5156
    First Author: Molkov, S.
    The Astronomer's Telegram, No. 14462
    Publication Date: May 2021
    Bibliographic Code: 2021ATel14462....1M
    Citations: 0
    ObsIDs in HEASARC

  17. A NuSTAR Observation of the black hole candidate XTE J1859+226 at a low Eddington fraction
    First Author: Draghis, Paul A.
    The Astronomer's Telegram, No. 14512
    Publication Date: Apr 2021
    Bibliographic Code: 2021ATel14512....1D
    Citations: 0
    ObsIDs in HEASARC

  18. Increased X-ray activity for the black hole binary GX 339-4 detected with NuSTAR and Swift/XRT
    First Author: Garcia, J.
    The Astronomer's Telegram, No. 14352
    Publication Date: Jan 2021
    Bibliographic Code: 2021ATel14352....1G
    Citations: 0
    ObsIDs in HEASARC

  19. NuSTAR observation of the ongoing outburst of the accreting X-ray pulsar 2S 1553-542
    First Author: Malacaria, C.
    The Astronomer's Telegram, No. 14348
    Publication Date: Jan 2021
    Bibliographic Code: 2021ATel14348....1M
    Citations: 0
    ObsIDs in HEASARC

  20. NuSTAR observation of the hard state of MAXI J1848-015
    First Author: Mihara, T.
    The Astronomer's Telegram, No. 14327
    Publication Date: Jan 2021
    Bibliographic Code: 2021ATel14327....1M
    Citations: 0
    ObsIDs in HEASARC

  21. NuSTAR observations of IGR J21347+4737 reveal that the source does not appear to be entering outburst
    First Author: Pike, Sean N.
    The Astronomer's Telegram, No. 14291
    Publication Date: Dec 2020
    Bibliographic Code: 2020ATel14291....1P
    Citations: 0
    ObsIDs in HEASARC

  22. NuSTAR observations and a refined position estimate of MAXI J1848-015
    First Author: Pike, Sean N.
    The Astronomer's Telegram, No. 14290
    Publication Date: Dec 2020
    Bibliographic Code: 2020ATel14290....1P
    Citations: 0
    ObsIDs in HEASARC

  23. NuSTAR constraints on the hard X-ray emission from FBOT AT2020xnd
    First Author: Brethauer, Daniel
    The Astronomer's Telegram, No. 14156
    Publication Date: Nov 2020
    Bibliographic Code: 2020ATel14156....1B
    Citations: 0
    ObsIDs in HEASARC

  24. NICER and NuSTAR observations of the Be/X-ray binary pulsar 1A 0535+262 during the 2020 November giant outburst
    First Author: Jaisawal, Gaurava K.
    The Astronomer's Telegram, No. 14179
    Publication Date: Nov 2020
    Bibliographic Code: 2020ATel14179....1J
    Citations: 0
    ObsIDs in HEASARC

  25. NuSTAR and NICER follow-up observations of the flaring blazar BL Lacertae
    First Author: D'Ammando, Filippo
    The Astronomer's Telegram, No. 14096
    Publication Date: Oct 2020
    Bibliographic Code: 2020ATel14096....1D
    Citations: 0
    ObsIDs in HEASARC

  26. NuSTAR observation of the newly discovered magnetar SGR 1830-0645
    First Author: Coti Zelati, F.
    The Astronomer's Telegram, No. 14092
    Publication Date: Oct 2020
    Bibliographic Code: 2020ATel14092....1C
    Citations: 0
    ObsIDs in HEASARC

  27. NuSTAR detection of relativistic reflection in AT2019wey
    First Author: Yao, Yuhan
    The Astronomer's Telegram, No. 13957
    Publication Date: Aug 2020
    Bibliographic Code: 2020ATel13957....1Y
    Citations: 0
    ObsIDs in HEASARC

  28. NuSTAR detection of Nova Reticuli 2020 = MGAB-V207
    First Author: Sokolovsky, K. V.
    The Astronomer's Telegram, No. 13900
    Publication Date: Jul 2020
    Bibliographic Code: 2020ATel13900....1S
    Citations: 0
    ObsIDs in HEASARC

  29. Correction to the ATel 13780: Previous burst activities of 1RXS J1708-4009
    First Author: Bernardini, M. G.
    The Astronomer's Telegram, No. 13782
    Publication Date: Jun 2020
    Bibliographic Code: 2020ATel13782....1B
    Citations: 0
    ObsIDs in HEASARC

  30. Brightest Non-Thermal X-ray Emission Observed from Eta Carinae
    First Author: Hamaguchi, Kenji
    The Astronomer's Telegram, No. 13738
    Publication Date: May 2020
    Bibliographic Code: 2020ATel13738....1H
    Citations: 1
    ObsIDs in HEASARC

  31. X-ray monitoring of the active magnetar SGR 1935+2154
    First Author: Borghese, A.
    The Astronomer's Telegram, No. 13720
    Publication Date: May 2020
    Bibliographic Code: 2020ATel13720....1B
    Citations: 1
    ObsIDs in HEASARC

  32. A NuSTAR Observation of the Black Hole Candidate 4U 1755-338
    First Author: Draghis, P.
    The Astronomer's Telegram, No. 13665
    Publication Date: Apr 2020
    Bibliographic Code: 2020ATel13665....1D
    Citations: 0
    ObsIDs in HEASARC

  33. The ultraluminous X-ray pulsar M82 X-2 is still spinning down
    First Author: Bachetti, Matteo
    The Astronomer's Telegram, No. 13583
    Publication Date: Mar 2020
    Bibliographic Code: 2020ATel13583....1B
    Citations: 0
    ObsIDs in HEASARC

  34. Detection of pulsed radio emission from bursting Magnetar Swift J1818.0-1607 below 750 MHz with the uGMRT
    First Author: Joshi, Bhal Chandra
    The Astronomer's Telegram, No. 13580
    Publication Date: Mar 2020
    Bibliographic Code: 2020ATel13580....1J
    Citations: 1
    ObsIDs in HEASARC

  35. Swift J1818.0-1607: NuSTAR and INTEGRAL observations of the new magnetar
    First Author: Borghese, A.
    The Astronomer's Telegram, No. 13569
    Publication Date: Mar 2020
    Bibliographic Code: 2020ATel13569....1B
    Citations: 1
    ObsIDs in HEASARC

  36. NICER and NuSTAR detections of Type I bursts and periodic dips in Swift J1858.6-0814
    First Author: Buisson, D. J. K.
    The Astronomer's Telegram, No. 13563
    Publication Date: Mar 2020
    Bibliographic Code: 2020ATel13563....1B
    Citations: 6
    ObsIDs in HEASARC

  37. NuSTAR and Chandra observations of the bright X-ray transient in SDSS J143359.16+400636.0
    First Author: Brightman, Murray
    The Astronomer's Telegram, No. 13510
    Publication Date: Feb 2020
    Bibliographic Code: 2020ATel13510....1B
    Citations: 0
    ObsIDs in HEASARC

  38. A NuSTAR Observation of MAXI J0637-430: A New X-ray Transient and Likely Black Hole X-ray Binary
    First Author: Tomsick, John A.
    The Astronomer's Telegram, No. 13270
    Publication Date: Nov 2019
    Bibliographic Code: 2019ATel13270....1T
    Citations: 2
    ObsIDs in HEASARC

  39. NuSTAR observation of the latest outburst of SAX J1808.4-3658
    First Author: Sanna, A.
    The Astronomer's Telegram, No. 13022
    Publication Date: Aug 2019
    Bibliographic Code: 2019ATel13022....1S
    Citations: 1
    ObsIDs in HEASARC

  40. Disk Reflection and Winds in a NuSTAR Observation of the Black Hole Candidate EXO 1846-031
    First Author: Miller, J. M.
    The Astronomer's Telegram, No. 13012
    Publication Date: Aug 2019
    Bibliographic Code: 2019ATel13012....1M
    Citations: 2
    ObsIDs in HEASARC

  41. NuSTAR observation of Swift J1357.2-0933 during its 2019 outburst
    First Author: Rao, Anjali
    The Astronomer's Telegram, No. 12821
    Publication Date: May 2019
    Bibliographic Code: 2019ATel12821....1R
    Citations: 0
    ObsIDs in HEASARC

  42. A NuSTAR Observation of GRS 1915+105 in its Unusual Low State
    First Author: Miller, J. M.
    The Astronomer's Telegram, No. 12788
    Publication Date: May 2019
    Bibliographic Code: 2019ATel12788....1M
    Citations: 1
    ObsIDs in HEASARC

  43. NuSTAR and Swift observations of MAXI J1820+070 indicate further dimming in X-rays
    First Author: Tomsick, John A.
    The Astronomer's Telegram, No. 12732
    Publication Date: May 2019
    Bibliographic Code: 2019ATel12732....1T
    Citations: 0
    ObsIDs in HEASARC

  44. Possible discovery of a cyclotron line in 4U 1901+03 with NuSTAR
    First Author: Coley, J. B.
    The Astronomer's Telegram, No. 12684
    Publication Date: Apr 2019
    Bibliographic Code: 2019ATel12684....1C
    Citations: 3
    ObsIDs in HEASARC

  45. NuSTAR and XMM-Newton follow-up of the blazar TXS 1515-273
    First Author: Ramazani, Vandad Fallah
    The Astronomer's Telegram, No. 12565
    Publication Date: Mar 2019
    Bibliographic Code: 2019ATel12565....1R
    Citations: 0
    ObsIDs in HEASARC

  46. XMM-Newton, NuSTAR and Swift follow-up of the new outburst of the magnetar XTE J1810-197
    First Author: Rea, Nanda
    The Astronomer's Telegram, No. 12600
    Publication Date: Mar 2019
    Bibliographic Code: 2019ATel12600....1R
    Citations: 0
    ObsIDs in HEASARC

  47. Localization and spectral properties of 4U 1901+03 with Swift/XRT and NuSTAR
    First Author: Mereminskiy, I. A.
    The Astronomer's Telegram, No. 12514
    Publication Date: Feb 2019
    Bibliographic Code: 2019ATel12514....1M
    Citations: 2
    ObsIDs in HEASARC

  48. NuSTAR shows continued X-ray activity of Swift J1858.6-0814 in an unusual spectral state
    First Author: Hare, J.
    The Astronomer's Telegram, No. 12512
    Publication Date: Feb 2019
    Bibliographic Code: 2019ATel12512....1H
    Citations: 4
    ObsIDs in HEASARC

  49. NuSTAR Observation of MAXI J1810-222
    First Author: Oeda, .
    The Astronomer's Telegram, No. 12398
    Publication Date: Jan 2019
    Bibliographic Code: 2019ATel12398....1O
    Citations: 0
    ObsIDs in HEASARC

  50. NuSTAR detection and localization of MAXI J1810-222
    First Author: Negoro, H.
    The Astronomer's Telegram, No. 12283
    Publication Date: Dec 2018
    Bibliographic Code: 2018ATel12283....1N
    Citations: 0
    ObsIDs in HEASARC

  51. NuSTAR confirms a new outburst for the Black Hole Binary GX 339-4
    First Author: Garcia, J. A.
    The Astronomer's Telegram, No. 12322
    Publication Date: Dec 2018
    Bibliographic Code: 2018ATel12322....1G
    Citations: 1
    ObsIDs in HEASARC

  52. NuSTAR X-ray Observation of the Outburst of Magnetar XTE J1810-197
    First Author: Gotthelf, E. V.
    The Astronomer's Telegram, No. 12297
    Publication Date: Dec 2018
    Bibliographic Code: 2018ATel12297....1G
    Citations: 5
    ObsIDs in HEASARC

  53. Deep INTEGRAL, NuSTAR and Swift ToO observations of accretion-powered millisecond pulsar IGR J17591-2342: a peculiar outburst profile showing a re-brightening onset on Aug. 18, 2018
    First Author: Kuiper, Lucien
    The Astronomer's Telegram, No. 12004
    Publication Date: Sep 2018
    Bibliographic Code: 2018ATel12004....1K
    Citations: 3
    ObsIDs in HEASARC

  54. IGRJ16181-5407 is likely an AGN
    First Author: Ursini, F.
    The Astronomer's Telegram, No. 11890
    Publication Date: Jul 2018
    Bibliographic Code: 2018ATel11890....1U
    Citations: 2
    ObsIDs in HEASARC

  55. Evidence for fading of the hard X-ray emission from AT2018cow
    First Author: Grefenstette, B.
    The Astronomer's Telegram, No. 11813
    Publication Date: Jul 2018
    Bibliographic Code: 2018ATel11813....1G
    Citations: 2
    ObsIDs in HEASARC

  56. NuSTAR observations of AT2018cow reveal a hard X-ray component of emission above 15 keV
    First Author: Margutti, R.
    The Astronomer's Telegram, No. 11775
    Publication Date: Jun 2018
    Bibliographic Code: 2018ATel11775....1M
    Citations: 3
    ObsIDs in HEASARC

  57. NuSTAR detects X-rays from a deeply embedded shock in the Fermi-detected nova ASASSN-18fv
    First Author: Nelson, Thomas
    The Astronomer's Telegram, No. 11608
    Publication Date: May 2018
    Bibliographic Code: 2018ATel11608....1N
    Citations: 7
    ObsIDs in HEASARC

  58. NuSTAR observations of Swift J1756.9-2508 during its April 2018 outburst
    First Author: Kuiper, Lucien
    The Astronomer's Telegram, No. 11603
    Publication Date: May 2018
    Bibliographic Code: 2018ATel11603....1K
    Citations: 2
    ObsIDs in HEASARC

  59. NuSTAR observation of Swift J1658.2-4242
    First Author: Xu, Y.
    The Astronomer's Telegram, No. 11321
    Publication Date: Feb 2018
    Bibliographic Code: 2018ATel11321....1X
    Citations: 1
    ObsIDs in HEASARC

  60. NuSTAR timing of NGC 300 ULX-1 / Supernova Impostor SN2010da
    First Author: Bachetti, Matteo
    The Astronomer's Telegram, No. 11282
    Publication Date: Feb 2018
    Bibliographic Code: 2018ATel11282....1B
    Citations: 6
    ObsIDs in HEASARC

  61. Detection of Type-I X-ray bursts from MAXI J1621-501
    First Author: Bult, Peter
    The Astronomer's Telegram, No. 11067
    Publication Date: Dec 2017
    Bibliographic Code: 2017ATel11067....1B
    Citations: 2
    ObsIDs in HEASARC

  62. NuSTAR Observation of GX 339-4 in the early stages of its 2017 outburst
    First Author: Garcia, J. A.
    The Astronomer's Telegram, No. 10825
    Publication Date: Oct 2017
    Bibliographic Code: 2017ATel10825....1G
    Citations: 1
    ObsIDs in HEASARC

  63. Swift and NuSTAR observations of Swift J0243.6+6124
    First Author: Bahramian, A.
    The Astronomer's Telegram, No. 10866
    Publication Date: Oct 2017
    Bibliographic Code: 2017ATel10866....1B
    Citations: 0
    ObsIDs in HEASARC

  64. Joint Swift XRT and NuSTAR Observations of TXS 0506+056
    First Author: Fox, D. B.
    The Astronomer's Telegram, No. 10845
    Publication Date: Oct 2017
    Bibliographic Code: 2017ATel10845....1F
    Citations: 0
    ObsIDs in HEASARC

  65. NuSTAR Observation of SN2017eaw
    First Author: Grefensetette, Brian
    The Astronomer's Telegram, No. 10427
    Publication Date: May 2017
    Bibliographic Code: 2017ATel10427....1G
    Citations: 0
    ObsIDs in HEASARC

  66. NuSTAR Observations of SMC X-3
    First Author: Pottschmidt, K.
    The Astronomer's Telegram, No. 9404
    Publication Date: Aug 2016
    Bibliographic Code: 2016ATel.9404....1P
    Citations: 3
    ObsIDs in HEASARC

  67. Glitch observation and hard X-ray power law measurement in PSR J1119-6127
    First Author: Archibald, R. F.
    The Astronomer's Telegram, No. 9284
    Publication Date: Jul 2016
    Bibliographic Code: 2016ATel.9284....1A
    Citations: 4
    ObsIDs in HEASARC

  68. NuSTAR and Swift detection of a ~600 s QPO in 4U 0115+63
    First Author: Ballhausen, R.
    The Astronomer's Telegram, No.8231
    Publication Date: Oct 2015
    Bibliographic Code: 2015ATel.8231....1B
    Citations: 3
    ObsIDs in HEASARC

  69. A gigantic X-ray flare from the star Trumpler 14 Y442 in the Carina star forming complex
    First Author: Hamaguchi, Kenji
    The Astronomer's Telegram, #7983
    Publication Date: Sep 2015
    Bibliographic Code: 2015ATel.7983....1H
    Citations: 1
    ObsIDs in HEASARC

  70. NuSTAR Observation of V404 Cyg During/After Decline
    First Author: Walton, Dominic
    The Astronomer's Telegram, #7752
    Publication Date: Jul 2015
    Bibliographic Code: 2015ATel.7752....1W
    Citations: 5
    ObsIDs in HEASARC

  71. A stall in the decline of V404 Cyg observed by NuSTAR
    First Author: Walton, Dominic
    The Astronomer's Telegram, No.7797
    Publication Date: Jul 2015
    Bibliographic Code: 2015ATel.7797....1W
    Citations: 3
    ObsIDs in HEASARC

  72. Swift, Chandra and NuSTAR observations of GK Per during the 2015 outburst
    First Author: Zemko, Polina
    The Astronomer's Telegram, No.7404
    Publication Date: Apr 2015
    Bibliographic Code: 2015ATel.7404....1Z
    Citations: 1
    ObsIDs in HEASARC

  73. NuSTAR observations of the magnetar candidate SGR 1935+2154
    First Author: Younes, G.
    The Astronomer's Telegram, #7213
    Publication Date: Mar 2015
    Bibliographic Code: 2015ATel.7213....1Y
    Citations: 3
    ObsIDs in HEASARC

  74. Hard X-ray spectral and timing properties of IGR J17454-2919 consistent with a black hole in the hard state
    First Author: Tendulkar, Shriharsh P.
    The Astronomer's Telegram, #6574
    Publication Date: Oct 2014
    Bibliographic Code: 2014ATel.6574....1T
    Citations: 2
    ObsIDs in HEASARC

  75. NuSTAR timing analysis of Swift J1808.4-1754: the pulse period is ~910 s
    First Author: Bachetti, Matteo
    The Astronomer's Telegram, #6229
    Publication Date: Jun 2014
    Bibliographic Code: 2014ATel.6229....1B
    Citations: 0
    ObsIDs in HEASARC

  76. NuSTAR observation of V475 Sco
    First Author: Rana, Vikram
    The Astronomer's Telegram, #5913
    Publication Date: Feb 2014
    Bibliographic Code: 2014ATel.5913....1R
    Citations: 3
    ObsIDs in HEASARC

  77. NuSTAR observations of GRB 130925A
    First Author: Bellm, E. C.
    The Astronomer's Telegram, #5435
    Publication Date: Oct 2013
    Bibliographic Code: 2013ATel.5435....1B
    Citations: 0
    ObsIDs in HEASARC

  78. NuSTAR detection of a transient in outburst north of Sgr A*
    First Author: Dufour, Francois
    The Astronomer's Telegram, #5073
    Publication Date: May 2013
    Bibliographic Code: 2013ATel.5073....1D
    Citations: 2
    ObsIDs in HEASARC

  79. NuSTAR detects extreme X-ray flaring of Mrk 421
    First Author: Balokovic, Mislav
    The Astronomer's Telegram, #4974
    Publication Date: Apr 2013
    Bibliographic Code: 2013ATel.4974....1B
    Citations: 12
    ObsIDs in HEASARC

  80. NuSTAR discovery of a 3.76 second pulsar in the Sgr A* region
    First Author: Mori, Kaya
    The Astronomer's Telegram, #5020
    Publication Date: Apr 2013
    Bibliographic Code: 2013ATel.5020....1M
    Citations: 7
    ObsIDs in HEASARC