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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"

19670 results found.

  1. GRB 200216B: GMG upper limit
  2. GRB 200216B: Swift detection of a burst
  3. Swift GRB200216.56: Global MASTER-Net observations report
  4. GRB 200215A: Swift-BAT refined analysis
  5. GRB 200215A: Swift-XRT refined Analysis
  6. GRB 200215A: Swift/UVOT Upper Limits
  7. GRB 200215A: Enhanced Swift-XRT position
  8. GRB 200215A: Fermi GBM detection
  9. Swift GRB200215.61: Global MASTER-Net observations report
  10. GRB 200215A: Swift detection of a burst
  11. LIGO/Virgo S200213t: Swift/BAT in the South Atlantic Anomaly
  12. LIGO/Virgo trigger S200213t: Possible host galaxies
  13. Konus-Wind observation of GRB 200205B
  14. GRB 200205B: Chilescope optical observations
  15. LIGO/Virgo S200208q: no counterpart candidates in the Swift/BAT observations
  16. GRB 200205B: Swift-BAT refined analysis
  17. Swift J0840.7-3516 (AKA GRB 200205A): Swift-BAT refined analysis
  18. Swift Trigger 954840 is not a GRB
  19. Swift GRB200207.13: Global MASTER-Net observations report
  20. GRB 200205B: Swift/UVOT Detection
  21. GRB 200205A = Swift J0840.7-3516: optical photometry in Chilescope observatory
  22. GRB 200205B: Swift-XRT refined Analysis
  23. GRB 200205A = Swift J0840.7-3516, A newly discovered transient X-ray Pulsar
  24. GRB 200205B: Enhanced Swift-XRT position
  25. GRB 200205A: Enhanced Swift-XRT position
  26. GRB 200205B: LCO Optical Detection
  27. GRB 200205B: Swift detection of a burst with optical counterpart
  28. Swift GRB200205.81: Global MASTER-Net observations report
  29. Swift GRB200205.81: Global MASTER-Net OT detection
  30. GRB 200205A / Swift trigger 954304: VLT optical observations
  31. GRB 200205A: MAXI/GSC detection
  32. GRB 200205A: MASTER Ot detection
  33. Swift GRB 200205A: Global MASTER-Net observations report
  34. GRB 200205A: Swift detection of a burst with a possible UV counterpart
  35. Konus-Wind observation of GRB 200131A
  36. GRB 200131A: CALET Gamma-Ray Burst Monitor detection
  37. GRB 200131A: Swift-BAT refined analysis
  38. ZTF Discovery of ZTF20aajnksq: a Rapidly Fading Luminous Transient in the GRB 200128A Localiziation Region
  39. GRB 200131A: Swift/UVOT Detection
  40. GRB 200131A: Swift-XRT refined Analysis
  41. GRB 200131A: VIRT optical transient detection
  42. GRB 200131A: LCO Optical Detection
  43. GRB 200131A: KAIT Optical Upper Limit
  44. GRB 200131A: Enhanced Swift-XRT position
  45. GRB 200131A: MASTER optical transient detection
  46. GRB 200131A: Swift detection of a burst with an optical counterpart
  47. Swift GRB200131.95: Global MASTER-Net observations report
  48. IPN triangulation of GRB 200130B
  49. LIGO/Virgo S200129m: no counterpart candidates in the Swift/BAT observations
  50. GRB 200127A: Swift-BAT refined analysis
  51. Konus-Wind observation of GRB 200125A
  52. LIGO/Virgo S200128d: no counterpart candidates in the Swift/BAT observations
  53. GRB 200127A: Swift/UVOT Upper Limits
  54. GRB 200127A: Mondy optical upper limit
  55. GRB 200127A: Nanshan-0.6m optical upper limit
  56. GRB 200127A: Enhanced Swift-XRT position
  57. GRB 200127A: Swift-XRT refined Analysis
  58. GRB 200127A: AbAO optical upper limit
  59. GRB 200125A: Swift-BAT refined analysis
  60. Swift GRB200127.61: Global MASTER-Net observations report
  61. GRB 200127A: Swift detection of a burst
  62. GRB 200125A: Further Swift-XRT observations
  63. GRB 200125A: Swift/UVOT Upper Limits
  64. GRB 200125A: AbAO optical upper limit
  65. Correction to GRB 200125A: Swift-XRT refined analysis
  66. GRB 200125A: Swift-XRT refined Analysis
  67. GRB 200125A: Nanshan-0.6m optical upper limit
  68. GRB 200125A: RATIR Optical Observations
  69. Swift GRB 200125A: Global MASTER-Net observations report
  70. GRB 200125A: Enhanced Swift-XRT position
  71. GRB 200125A: Swift detection of a burst
  72. GRB 200122A: Optical upper limit: correction to the GCN circ. 26870
  73. GRB 200122A: AstroSat CZTI detection
  74. GRB 200122A: Optical upper limit
  75. GRB 200122A: Mondy optical upper limit
  76. Konus-Wind observation of GRB 200122A
  77. GRB 200122A: MITSuME Akeno optical upper limits
  78. LIGO/Virgo S200115j: Zwicky Transient Facility search for optical counterparts to Swift X-ray sources
  79. GRB 200122A: RATIR Optical Observations
  80. GRB 200122A: Swift-BAT refined analysis
  81. GRB 200122A: Xinglong-2.16m optical upper limit
  82. GRB 200122A: Swift/UVOT Upper Limits
  83. IPN Triangulation of GRB 200120A
  84. LIGO/Virgo S200115j: Further Swift-XRT sources
  85. GRB 200122A: GOTO non-detection of optical afterglow
  86. GRB 200122A: Swift-XRT refined Analysis
  87. GRB 200122A: Enhanced Swift-XRT position
  88. Swift GRB 200122A: Global MASTER-Net observations report
  89. GRB 200122A: Swift detection of a burst
  90. GRB 191031D: XMM-Newton upper limit
  91. GRB 200115A: CALET Gamma-Ray Burst Monitor detection
  92. LIGO/Virgo S200115j: Swift/UVOT observations of Swift/XRT S200115j_X136
  93. GRB 200115A: AROMA-N Optical Observation
  94. LIGO/Virgo S200115j: Swift-XRT sources
  95. LIGO/Virgo S200114f: ZTF Forced Photometry of the Swift Source S200114f_X2
  96. GRB 200115A: DDOTI/OAN optical observations report
  97. LIGO/Virgo S200114f: Possible X-ray transient
  98. LIGO/Virgo S200114f: Swift-XRT sources and observations
  99. GRB 200115A: Swift-BAT refined analysis
  100. LIGO/Virgo S200115j: no counterpart candidates in the Swift/BAT observations

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