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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

191 results found.

  1. AT2024adec: X-ray Upper Limits from EP-FXT Observation
  2. XMM-Newton observation of EP240426a
  3. LIGO/Virgo/KAGRA S240422ed: X-ray Upper Limits from EP-FXT for the Potential Electromagnetic Counterparts Reported by Swift and DECam
  4. GRB 231115A: XMM-Newton observation
  5. GRB 211106A: XMM-Newton monitoring campaign detections
  6. IceCube 201021A: Swift follow-up of Fermi J1725.5+1312
  7. Fermi-LAT Gamma-ray Observations of IceCube-201021A and detection of a new gamma-ray source, Fermi J1725.5+1312
  8. GRB 200415A: MASTER imspection and possible localisation
  9. Further Swift-XRT observations of Swift J0840.7-3516
  10. LIGO/Virgo S200115j: Further Swift-XRT sources
  11. GRB 191031D: XMM-Newton upper limit
  12. IceCube-190221A: Swift-XRT Follow-up Observations
  13. CORRECTED TARGET NAME: GRB 190114C: Planned XMM-Newton observation
  14. GRB 150114C#: Planned XMM-Newton observation
  15. IceCube-190104A: Swift-XRT observations
  16. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  17. GW170817/GRB170817A: Preliminary results of Chandra monitoring
  18. LIGO/Virgo GW170817: Chandra X-ray Emission Continues to Rise ~156 Days Post-Merger
  19. LIGO/Virgo G299232/GW170825: serendipitous XMM-Newton slew observations
  20. LIGO/Virgo G298936/GW170823: serendipitous XMM-Newton slew observations
  21. IceCube-170922A: Swift-XRT observations
  22. LIGO/Virgo G297595: Swift-XRT sources
  23. GRB170714A: XMM observation of the afterglow
  24. LIGO/Virgo G275697: Further Swift-XRT sources
  25. LIGO/Virgo G275697: Further Swift-XRT sources
  26. LIGO/Virgo G275697: Further Swift-XRT sources
  27. LIGO/Virgo G275697: Swift-XRT sources
  28. LIGO/Virgo G268556: Swift-XRT detection of ATLAS17aeu
  29. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  30. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  31. LIGO/Virgo G211117: Further Swift-XRT sources
  32. GRB151127A: Planned XMM-Newton observation
  33. LIGO/Virgo G184098: Swift follow-up observations
  34. GRB 150818A: Planned XMM-Newton observation
  35. Trigger 649113: Swift detection of SGR 1E 1841-045
  36. Trigger 639199: Swift detection of IGRJ16418-4532
  37. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  38. Swift J0045.2+4151: analysis of XMM-Newton archival data
  39. Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
  40. BAT trigger 633105 (GRB 150301C): NOT r-band upper limit
  41. Trigger 633105 (aka GRB150301C): Swift/UVOT Observations of XRT Counterpart
  42. GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
  43. GRB 150101B/Swift J123205.1-105602: XMM-Newton observation
  44. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  45. Swift detection of the variable star SZ Psc
  46. Swift detection of UX Ari
  47. Swift detection of a bright X-ray source in M31
  48. Swift trigger 599860 probably not real
  49. Swift Trigger 596958 is probably the flare star: DG CVn
  50. GRB 131202A : XMM-Newton planned observation
  51. GRB 130821A: Swift-XRT observation
  52. GRB 130603B: First epoch of XMM-Newton observations
  53. Planned XMM-Newton and IRAM observation of GRB 121011A
  54. GRB 120804A: Late-time Chandra observation
  55. XMM observations of the short GRB120804A
  56. Trigger 530588: Swift detection of XMM J174457-2850.3
  57. GRB120711A: Planned XMM-Newton observation
  58. Swift triggers (#524542) on a Galactic source
  59. XMM-Newton observation of the short GRB 111020A
  60. GRB 111209A: GROND Afterglow observations
  61. GRB111209A : planned XMM-Newton observation
  62. GRB 111020A: Planned XMM-Newton observation
  63. SGR J1834.9-0846: A Neutron Star in W41?
  64. GRB 110807A: Swift detection of a burst or a posible new SGR
  65. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  66. GRB 100909A: Planned XMM-Newton observation
  67. GRB 100614 : XMM-Newton observation
  68. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  69. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  70. GRB 090618: planned XMM-Newton observation
  71. Trigger 330353: Swift detection of a Galactic short soft burst
  72. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  73. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  74. SGR 0501+4516: XMM-Newton monitoring schedule
  75. GRB 080723B: GROND upper limits
  76. GRB 080723B: XMM-Newton observation
  77. GRB 080723B : Planned XMM-Newton observation
  78. Reactivation of SGR 1627-41
  79. GRB 080120 : Planned XMM-Newton observation
  80. GRB 071017 - Swift XRT observations
  81. GRB 070411 : Planned XMM-Newton observation
  82. GRB 061121 declared "Burst of Interest" by Swift team
  83. GRB 061121 : Planned XMM-Newton observation
  84. GRB060729: analysis of XMM-Newton observation
  85. GRB 060729 : Planned XMM-Newton observation
  86. GRB 060602B: XMM-Newton Survey Source
  87. XMM-Newton observation of GRB060510b
  88. GRB 060510B : Planned XMM-Newton observation
  89. INTEGRAL and XMM ToO observations of SGR1900+14
  90. GRB060218: analysis of the XMM-Newton observation
  91. GRB051016: analysis of the XMM-Newton observation
  92. GRB050925: analysis of the XMM-Newton observation
  93. GRB/SGR 050925: XMM-Newton ToO observation
  94. GRB051016 XMM-Newton observation
  95. GRB051016: Planned XMM-Newton observation
  96. GRB050820B: analysis of the XMM-Newton observation
  97. GRB050820B XMM-Newton observation
  98. GRB050820B: Planned XMM-Newton observation
  99. GRB 050730 XMM-Newton observation
  100. GRB 050730 : Planned XMM-Newton observation

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