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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"

27784 results found.

  1. Retraction of Swift Trigger 317393
  2. Trigger 317393: Swift detection of a possible GRB
  3. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  4. GRB 080714: GROND confirmation of the optical/NIR afterglow
  5. Konus-Wind observation of GRB 080714
  6. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  7. GRB 080714: Swift-XRT refined analysis
  8. GRB 080714: Enhanced Swift-XRT position
  9. GRB 080714: Swift-BAT refined analysis
  10. GRB 080714: Swift detection of a burst
  11. GRB 080603B: optical observations in MAO
  12. GRB 080603B: optical observations in CrAO
  13. GRB 080710: TLS observations, steepening afterglow decay
  14. GRB 080702B: Swift XRT confirmation of the afterglow
  15. GRB 080710: Lick IR detection
  16. GRB 080710, Swift-BAT refined analysis
  17. GRB 080710: Swift-XRT refined analysis
  18. GRB080710: Swift/UVOT observations
  19. GRB 080710: Enhanced Swift-XRT position
  20. UVOT white band observations of GRB080710
  21. GRB 080710: KAIT OA candidate
  22. GRB 080710: Swift XRT position
  23. GRB 080710: Swift detection of a burst
  24. GRB 080707: possible break in the X-rays
  25. New Swift-XRT GRB products available online.
  26. GRB 080707: GROND Confirmation of the Optical Afterglow
  27. UVOT observations of GRB080707
  28. GRB 080707, Swift-BAT refined analysis
  29. GRB 080707: Swift XRT refined analysis
  30. GRB 080707: Enhanced Swift-XRT position
  31. GRB 080707: VLT redshift
  32. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  33. GRB 080707: Swift detection of a burst
  34. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  35. Trigger 316063: Swift detection of a transient
  36. GRB 080703: GROND Upper Limits
  37. GRB 080702B: GROND Upper Limits
  38. GRB 080703: Swift-XRT refined analysis
  39. GRB 080703: UVOT Follow-Up Observation
  40. GRB 080703: Enhanced Swift-XRT position
  41. GRB 080703, Swift-BAT refined analysis
  42. GRB 080702B Swift-BAT refined analysis
  43. GRB 080703: Swift detection of a burst with optical afterglow
  44. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  45. No radio detection from the short GRB 080702A
  46. Swift/UVOT observation of GRB080702A
  47. GRB 080702B: Swift XRT and UVOT observations
  48. GRB 080701A: Early RAPTOR optical limits
  49. Swift Trigger 315630: Swift/UVOT Upper Limits
  50. GRB 080702A, Swift-BAT refined analysis
  51. GRB 080702A: Swift-XRT Team refined analysis
  52. GRB 080702B : Burst detected in BAT during Swift slew
  53. GRB 080702A: Enhanced Swift-XRT position
  54. Swift Trigger 315630: TLS R-band observation
  55. Swift Trigger 315630: Probably not a GRB
  56. GRB 080702: Swift detection of a short burst
  57. GRB 080701: Swift-XRT refined analysis
  58. TLS I-Band Observation of GRB 080701A
  59. GRB 080701A: Swift/UVOT Upper Limits
  60. GRB 080701: Enhanced Swift-XRT position
  61. GRB 080701A, Swift-BAT refined analysis
  62. Trigger 315630: Swift detection of a possible burst
  63. GRB 080701: Swift-XRT Prompt Analysis
  64. GRB 080701: Swift detection of a burst
  65. GRB 080623: Suzaku WAM observation of the prompt emission
  66. GRB 080625: Swift/UVOT Follow-Up Observations
  67. GRB 080625:Swift-XRT detection of the afterglow
  68. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  69. GRB 080623: GROND upper limits
  70. GRB080623: Swift UVOT followup observations
  71. GRB 080623: Swift-XRT refined analysis
  72. GRB 080623, Swift-BAT refined analysis
  73. GRB 080623: Enhanced Swift-XRT position
  74. GRB 080623: TAROT La Silla observatory optical observations
  75. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  76. GRB 080623: Swift XRT prompt analysis
  77. GRB 080623: Swift detection of a burst
  78. Swift trigger 314975 is not a GRB
  79. Swift-BAT trigger 314975 possible burst
  80. GRB080607: optical observation
  81. GRB 080603b: optical observation
  82. GRB 070809: Putative host galaxy and redshift
  83. Konus-Wind observation of GRB 080613B
  84. GRB 080613A: Swift-XRT detection of the afterglow
  85. GRB080613A: Swift/UVOT Upper Limits
  86. GRB 080613B: GROND Upper Limits
  87. GRB080613B: Swift/UVOT Upper Limits
  88. GRB 080613B, Swift-BAT refined analysis
  89. GRB 080613B: Swift-XRT refined analysis
  90. GRB 080613B: Swift detection of a burst
  91. GRB 080603b: optical observation
  92. Swift observations of BAT Slew Survey event (Trigger=010)
  93. GRB 080603A: final Swift-XRT observations.
  94. GRB 080607: AGILE-MCAL observation of the prompt emission
  95. GRB 080603B - TLS 2nd Epoch: Another Break
  96. GRB 080605: TLS 3rd Epoch - Source Confusion
  97. Konus-Wind observation of GRB 080607
  98. GRB080607: RTT150 optical observations
  99. GRB 080607: Swift-XRT refined analysis
  100. Swift/UVOT Observations of GRB080607

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