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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19663 results found.

  1. GRB 200215A: Swift-BAT refined analysis
  2. GRB 200215A: Swift-XRT refined Analysis
  3. GRB 200215A: Swift/UVOT Upper Limits
  4. GRB 200215A: Enhanced Swift-XRT position
  5. GRB 200215A: Fermi GBM detection
  6. Swift GRB200215.61: Global MASTER-Net observations report
  7. GRB 200215A: Swift detection of a burst
  8. LIGO/Virgo S200213t: Swift/BAT in the South Atlantic Anomaly
  9. LIGO/Virgo trigger S200213t: Possible host galaxies
  10. Konus-Wind observation of GRB 200205B
  11. GRB 200205B: Chilescope optical observations
  12. LIGO/Virgo S200208q: no counterpart candidates in the Swift/BAT observations
  13. GRB 200205B: Swift-BAT refined analysis
  14. Swift J0840.7-3516 (AKA GRB 200205A): Swift-BAT refined analysis
  15. Swift Trigger 954840 is not a GRB
  16. Swift GRB200207.13: Global MASTER-Net observations report
  17. GRB 200205B: Swift/UVOT Detection
  18. GRB 200205A = Swift J0840.7-3516: optical photometry in Chilescope observatory
  19. GRB 200205B: Swift-XRT refined Analysis
  20. GRB 200205A = Swift J0840.7-3516, A newly discovered transient X-ray Pulsar
  21. GRB 200205B: Enhanced Swift-XRT position
  22. GRB 200205A: Enhanced Swift-XRT position
  23. GRB 200205B: LCO Optical Detection
  24. GRB 200205B: Swift detection of a burst with optical counterpart
  25. Swift GRB200205.81: Global MASTER-Net observations report
  26. Swift GRB200205.81: Global MASTER-Net OT detection
  27. GRB 200205A / Swift trigger 954304: VLT optical observations
  28. GRB 200205A: MAXI/GSC detection
  29. GRB 200205A: MASTER Ot detection
  30. Swift GRB 200205A: Global MASTER-Net observations report
  31. GRB 200205A: Swift detection of a burst with a possible UV counterpart
  32. Konus-Wind observation of GRB 200131A
  33. GRB 200131A: CALET Gamma-Ray Burst Monitor detection
  34. GRB 200131A: Swift-BAT refined analysis
  35. ZTF Discovery of ZTF20aajnksq: a Rapidly Fading Luminous Transient in the GRB 200128A Localiziation Region
  36. GRB 200131A: Swift/UVOT Detection
  37. GRB 200131A: Swift-XRT refined Analysis
  38. GRB 200131A: VIRT optical transient detection
  39. GRB 200131A: LCO Optical Detection
  40. GRB 200131A: KAIT Optical Upper Limit
  41. GRB 200131A: Enhanced Swift-XRT position
  42. GRB 200131A: MASTER optical transient detection
  43. GRB 200131A: Swift detection of a burst with an optical counterpart
  44. Swift GRB200131.95: Global MASTER-Net observations report
  45. IPN triangulation of GRB 200130B
  46. LIGO/Virgo S200129m: no counterpart candidates in the Swift/BAT observations
  47. GRB 200127A: Swift-BAT refined analysis
  48. Konus-Wind observation of GRB 200125A
  49. LIGO/Virgo S200128d: no counterpart candidates in the Swift/BAT observations
  50. GRB 200127A: Swift/UVOT Upper Limits
  51. GRB 200127A: Mondy optical upper limit
  52. GRB 200127A: Nanshan-0.6m optical upper limit
  53. GRB 200127A: Enhanced Swift-XRT position
  54. GRB 200127A: Swift-XRT refined Analysis
  55. GRB 200127A: AbAO optical upper limit
  56. GRB 200125A: Swift-BAT refined analysis
  57. Swift GRB200127.61: Global MASTER-Net observations report
  58. GRB 200127A: Swift detection of a burst
  59. GRB 200125A: Further Swift-XRT observations
  60. GRB 200125A: Swift/UVOT Upper Limits
  61. GRB 200125A: AbAO optical upper limit
  62. Correction to GRB 200125A: Swift-XRT refined analysis
  63. GRB 200125A: Swift-XRT refined Analysis
  64. GRB 200125A: Nanshan-0.6m optical upper limit
  65. GRB 200125A: RATIR Optical Observations
  66. Swift GRB 200125A: Global MASTER-Net observations report
  67. GRB 200125A: Enhanced Swift-XRT position
  68. GRB 200125A: Swift detection of a burst
  69. GRB 200122A: Optical upper limit: correction to the GCN circ. 26870
  70. GRB 200122A: AstroSat CZTI detection
  71. GRB 200122A: Optical upper limit
  72. GRB 200122A: Mondy optical upper limit
  73. Konus-Wind observation of GRB 200122A
  74. GRB 200122A: MITSuME Akeno optical upper limits
  75. LIGO/Virgo S200115j: Zwicky Transient Facility search for optical counterparts to Swift X-ray sources
  76. GRB 200122A: RATIR Optical Observations
  77. GRB 200122A: Swift-BAT refined analysis
  78. GRB 200122A: Xinglong-2.16m optical upper limit
  79. GRB 200122A: Swift/UVOT Upper Limits
  80. IPN Triangulation of GRB 200120A
  81. LIGO/Virgo S200115j: Further Swift-XRT sources
  82. GRB 200122A: GOTO non-detection of optical afterglow
  83. GRB 200122A: Swift-XRT refined Analysis
  84. GRB 200122A: Enhanced Swift-XRT position
  85. Swift GRB 200122A: Global MASTER-Net observations report
  86. GRB 200122A: Swift detection of a burst
  87. GRB 191031D: XMM-Newton upper limit
  88. GRB 200115A: CALET Gamma-Ray Burst Monitor detection
  89. LIGO/Virgo S200115j: Swift/UVOT observations of Swift/XRT S200115j_X136
  90. GRB 200115A: AROMA-N Optical Observation
  91. LIGO/Virgo S200115j: Swift-XRT sources
  92. LIGO/Virgo S200114f: ZTF Forced Photometry of the Swift Source S200114f_X2
  93. GRB 200115A: DDOTI/OAN optical observations report
  94. LIGO/Virgo S200114f: Possible X-ray transient
  95. LIGO/Virgo S200114f: Swift-XRT sources and observations
  96. GRB 200115A: Swift-BAT refined analysis
  97. LIGO/Virgo S200115j: no counterpart candidates in the Swift/BAT observations
  98. IPN triangulation of GRB 200111A
  99. LIGO/Virgo S200115j High Rank XRT sources are spurious
  100. GRB 200115A: MITSuME Okayama optical upper limits

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