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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"

19662 results found.

  1. V404Cyg Swift Trigger 668097: TSHAO optical observations
  2. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  3. V404Cyg Swift Trigger 668097:
  4. Trigger 668097: Swift detection of V 404 Cyg
  5. GRB151215A: Continued P60 Observations
  6. GRB 151215A: MITSuME Akeno optical upper limits
  7. GRB 151215A: Swift-XRT refined Analysis
  8. GRB 151215A: Swift-BAT refined analysis
  9. GRB151215A: Swift/UVOT detection
  10. GRB 151215A: Enhanced Swift-XRT position
  11. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  12. GRB 151215A: Prompt enhanced Swift-XRT position
  13. GRB 151215A: Swift detection of a burst
  14. GRB151212A: Swift/UVOT observations
  15. GRB 151212A: GROND Optical Afterglow Candidate
  16. GRB 151212A: Swift-XRT afterglow detection
  17. GRB 151212A: Tiled Swift observations
  18. GRB 151210A: Swift/UVOT Upper Limits
  19. GRB 151210A: Swift-BAT refined analysis
  20. GRB 151210A: Swift-XRT refined Analysis
  21. GRB 151210A: Enhanced Swift-XRT position
  22. GRB 151210A: GROND Afterglow Confirmation
  23. GRB 151210A: Swift detection of a burst
  24. GRB 151205A: Khureltogot upper limit
  25. Swift detection of 4U 1850-03
  26. GRB 151205B: Deep GROND Upper limits
  27. GRB 130831A: MASTER early OT detection and LC
  28. GRB 151205B: further Swift-XRT observations
  29. GRB 151205C: Swift-XRT observations
  30. GRB 151205B, Swift-BAT refined analysis
  31. GRB 151205A: Swift-XRT refined Analysis
  32. GRB 151205A, Swift-BAT refined analysis
  33. GRB 151205C: Tiled Swift observations
  34. GRB 151205B: MASTER-NET early optical observations
  35. GRB 151205A: Fermi GBM detection
  36. GRB 151205A: Garching Telescope Upper Limit
  37. GRB151205B: Initial UVOT observations
  38. GRB 151205B: Swift-XRT observations
  39. GRB 151205A: Swift/UVOT Upper Limits
  40. GRB 151205B: Swift detection of a burst
  41. GRB 151205A: Enhanced Swift-XRT position
  42. GRB 151205A: Swift detection of a burst
  43. GRB 151127A iTelescope observation
  44. GRB 151122A: Further Swift-XRT observations, no afterglow detected.
  45. GRB 151127A: Swift/UVOT Upper Limits
  46. GRB 151127A: Swift-XRT refined Analysis
  47. GRB 151127A: Swift-BAT refined analysis
  48. GRB 151127A: Enhanced Swift-XRT position
  49. GRB 151127A: GROND K-band upper limit
  50. GRB 151127A: Swift detection of a short burst
  51. GRB 151118A iTelescope observation
  52. GRB 151122A: Swift/UVOT Observations
  53. GRB 151122A: Swift-XRT observations
  54. GRB 151122A: Fermi GBM detection
  55. GRB 151122A: Swift ToO observations
  56. GRB 151122A: Swift detection of a burst
  57. GRB 151027A: Maidanak optical observations
  58. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  59. Swift Trigger 664610 is not astrophysical
  60. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  61. Swift Trigger 664610: is unlikely a GRB
  62. GRB 151120A: Swift-XRT afterglow detection
  63. GRB 151118A: AAO optical upper limit
  64. GRB 151120A: Swift ToO observations
  65. GRB 151118A, Swift-BAT refined analysis
  66. 610 MHz detection of GRB 151027A with the GMRT
  67. GRB 151118A: ISON-NM early optical limit
  68. GRB 151118A: Swift-XRT refined Analysis
  69. GRB 151118A: Swift/UVOT Upper Limits
  70. GRB 151118A: Enhanced Swift-XRT position
  71. GRB GRB 151118A: MASTER-NET optical observations
  72. GRB 151118A: Swift detection of a burst
  73. Swift-BAT resumption of normal operations
  74. GMRT radio detection of GRB 151027A
  75. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  76. GRB 151114A: Swift-XRT refined Analysis
  77. GRB 151114A: Swift-BAT refined analysis
  78. GRB 151112A: GROND photometric redshift and i'-band prediction
  79. GRB 151114A: Swift/UVOT Detection
  80. GRB 151114A: LCOGT-FTS afterglow observations
  81. GRB 151114A: Enhanced Swift-XRT position
  82. GRB 151114A: Swift detection of a burst with an optical counterpart
  83. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  84. GRB 151112A: Swift/UVOT Upper Limits
  85. GRB 151112A: MAXI/GSC detection
  86. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  87. GRB 151112A: Swift-XRT refined Analysis
  88. GRB 151112A: Swift-BAT refined analysis
  89. GRB 151112A: Enhanced Swift-XRT position
  90. GRB 151112A: MASTER-NET optical limit
  91. GRB 151112A: Swift-XRT observations
  92. GRB 151112A: Swift detection of a burst
  93. GRB 151111A: Swift/UVOT upper limits
  94. Swift-BAT trigger 663164 is not a burst.
  95. GRB 151111A: GROND marginal detection of a afterglow candidate
  96. GRB 151111A: Swift-XRT refined Analysis
  97. GRB 151111A: Fermi GBM observation
  98. GRB 151111A: LCOGT-FTS afterglow observations
  99. GRB 151111A: Swift-BAT refined analysis
  100. GRB 151111A: Enhanced Swift-XRT position

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