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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"

28068 results found.

  1. GRB 060219: Swift-XRT Team refined analysis
  2. GRB 051221B: Swift-XRT Team Refined Analysis
  3. GRB060218: Radio Afterglow Discovery
  4. GRB 060219: Swift-XRT position typo correction
  5. GRB 060218: MDM Redshift
  6. GRB 060219: Swift-XRT position
  7. GRB 060218: optical/nIR observations at La Palma
  8. GRB 060219: Swift-BAT detection of a weak burst
  9. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  10. Brightening of the Optical Counterpart of the Possible GRB 060218
  11. GRB 060218: MDM Observations
  12. GRB 060218: Pre-burst detection of a possible host galaxy
  13. GRB 060218A: ROTSE-III Possible Optical Flare
  14. GRB060218: Swift/XRT refined position of a possible burst
  15. Preliminary refined analysis of the Swift-BAT trigger 191157
  16. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  17. GRB 060211B: Swift/UVOT Upper Limits
  18. GRB 060218: Swift XRT Position
  19. GRB 060218: Swift-BAT detection of a possible burst
  20. GRB 060213: optical afterglow not confirmed
  21. Swift UVOT observations of GRB060213
  22. GRB 060213: optical afterglow candidate
  23. GRB060213: Swift XRT observations and possible afterglow candidate
  24. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  25. GRB 060211b: WIRO NIR Observations
  26. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  27. GRB 060210: Radio Observations
  28. GRB 060211a: WIRO NIR Observations
  29. GRB060211B: REM optical and NIR observations
  30. GRB060121: optical observations
  31. GRB060105: optical observations
  32. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  33. GRB 060211b: P60 Observations
  34. GRB 060206: SOAR Detections
  35. GRB 050826: Optical Afterglow and Host Galaxy
  36. GRB060210: Swift/UVOT Upper Limits
  37. GRB 060211B: Swift-XRT Team refined analysis
  38. GRB060211b: optical observation
  39. GRB060211B: Swift/XRT position
  40. GRB 060210: Optical Observations
  41. GRB 060211A: Swift XRT Team Refined Analysis
  42. GRB 060211B: Swift-BAT detection of a burst
  43. GRB060211: Faulkes North observation
  44. GRB 060211: Swift detection of a long burst
  45. GRB060210: Swift XRT Refined Analysis
  46. GRB 060210 : Xinglong and Lulin optical limit
  47. GRB060210: Optical Observations
  48. GRB060210: Gemini absorption spectroscopy
  49. GRB060210: Early Optical Observations
  50. GRB 060210: optical evolution
  51. GRB060210:Faulkes Telescope North Afterglow Confirmation
  52. GRB 060210: candidate afterglow
  53. GRB 060210: Swift detection of a burst
  54. GRB060210: Optical afterglow
  55. GRB 060206: Swift/UVOT Observations
  56. GRB 060209(?): Swift-BAT detection of a possible burst
  57. GRB 060206: near-infrared observations (JK' imaging)
  58. GRB 060206: WSRT Radio Observations
  59. GRB 060203: Swift/UVOT upper limits
  60. GRB 060206: TTT Observations
  61. GRB 060206: More PROMPT Detections
  62. GRB 060121 : WIDGET Pre-trigger limit
  63. GRB 060206: Tenagra II Observations
  64. GRB 060206: PROMPT Detections
  65. Retraction of orphan GRB afterglow candidate
  66. GRB060204a: Swift XRT Source is not GRB Afterglow
  67. GRB 060206: optical observations at Asiago
  68. Orphan GRB Afterglow candidate
  69. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  70. GRB 060206: Subaru/FOCAS optical spectroscopy
  71. GRB 060206: IR Detection of the Afterglow
  72. GRB 060206: Lick 3m Spectroscopy
  73. GRB 060204A: ROSAT Pointing
  74. GRB 060206: Super-LOTIS observations
  75. GRB060204A: Swift/UVOT observations
  76. GRB 060206 : Lulin optical observations
  77. GRB060206: Swift XRT Refined Analysis
  78. GRB060206: Liverpool Telescope observation
  79. GRB 060206: Spectroscopic Redshift
  80. GRB060206: P60 Optical Observations
  81. GRB 060206: KAIT observations
  82. GRB060206: Swift XRT Position
  83. GRB060206: SARA Detection
  84. GRB 060206: RAPTOR observations of afterglow candidate variability.
  85. GRB 060206: High redshift burst
  86. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  87. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  88. GRB060206: Optical afterglow
  89. GRB060206: Swift-BAT detection of a burst
  90. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  91. BAT GRB 060204C is probably not a GRB
  92. GRB 060204B: BVRi-band detections of optical afterglow
  93. GRB 060204A: Swift XRT upper limit
  94. GRB060204B: Swift/UVOT refined analysis
  95. GRB 060204C: optical observations
  96. Swift XRT Observation of GRB 060204C
  97. GRB 060204B: ART early limit
  98. GRB060204B: Swift XRT Team Refined Analysis
  99. GRB 060204b: Keck/LRIS Afterglow Confirmation
  100. GRB 060204C: Liverpool Telescopes optical limit

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