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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"

45649 results found.

  1. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  2. GRB 060211A: Further refined analysis of the Swift burst
  3. GRB060121: optical observations
  4. GRB060110: optical observations
  5. GRB060105: optical observations
  6. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  7. GRB 060211b: P60 Observations
  8. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  9. GRB 060206: SOAR Detections
  10. GRB 050826: Optical Afterglow and Host Galaxy
  11. GRB 060210: Further refined analysis of the Swift-BAT burst
  12. GRB 060211B: Swift/BAT refined analysis
  13. GRB060210: Swift/UVOT Upper Limits
  14. GRB 060211B: Swift-XRT Team refined analysis
  15. GRB060211b: optical observation
  16. GRB060211B: Swift/XRT position
  17. GRB 060210: Optical Observations
  18. GRB060211.7: MASTER_optical_observation under the snow
  19. GRB 060211A: Swift XRT Team Refined Analysis
  20. GRB 060211B: Swift-BAT detection of a burst
  21. GRB060211: Faulkes North observation
  22. GRB 060211: ROTSE-III Optical Limits
  23. GRB 060211: Swift detection of a long burst
  24. GRB 060210: Refined analysis of the Swift-BAT burst
  25. GRB060210: Swift XRT Refined Analysis
  26. GRB060206, optical observations
  27. GRB 060210 : Xinglong and Lulin optical limit
  28. GRB060210: Optical Observations
  29. GRB060210: Gemini absorption spectroscopy
  30. GRB060210: Early Optical Observations
  31. GRB 060210: optical evolution
  32. GRB060210:Faulkes Telescope North Afterglow Confirmation
  33. GRB 060210: candidate afterglow
  34. GRB 060210: Swift detection of a burst
  35. GRB060210: Optical afterglow
  36. GRB 060206: Swift/UVOT Observations
  37. Swift-BAT trigger 180931 is not a GRB
  38. GRB060209: RTT150 optical observations
  39. GRB 060209 : TAROT optical observation
  40. GRB060209A: MASTER optical observation
  41. GRB 060209(?): Swift-BAT detection of a possible burst
  42. GRB 060206: near-infrared observations (JK' imaging)
  43. GRB 060206: WSRT Radio Observations
  44. GRB 060203: Swift/UVOT upper limits
  45. GRB 060206: TTT Observations
  46. GRB 060206: More PROMPT Detections
  47. GRB 060121 : WIDGET Pre-trigger limit
  48. GRB 060206: Tenagra II Observations
  49. GRB 060206: PROMPT Detections
  50. Retraction of orphan GRB afterglow candidate
  51. GRB060204a: Swift XRT Source is not GRB Afterglow
  52. GRB 060206: optical observations at Asiago
  53. Orphan GRB Afterglow candidate
  54. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  55. GRB 060206: Subaru/FOCAS optical spectroscopy
  56. GRB 060206: IR Detection of the Afterglow
  57. GRB 060206: Lick 3m Spectroscopy
  58. GRB 060204A: ROSAT Pointing
  59. GRB 060206: Super-LOTIS observations
  60. GRB060204A: Swift/UVOT observations
  61. GRB 060206: Swift-BAT refined analysis
  62. GRB 060206 : Lulin optical observations
  63. GRB060206: SDSS Pre-Burst Observations
  64. GRB060206: Swift XRT Refined Analysis
  65. GRB060206: Liverpool Telescope observation
  66. GRB 060206: Spectroscopic Redshift
  67. GRB060206: P60 Optical Observations
  68. GRB 060206: KAIT observations
  69. GRB060206: Swift XRT Position
  70. GRB060206: SARA Detection
  71. GRB 060206: RAPTOR observations of afterglow candidate variability.
  72. GRB 060206: High redshift burst
  73. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  74. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  75. GRB060206: Optical afterglow
  76. GRB060206: Swift-BAT detection of a burst
  77. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  78. GRB060203: WHT Z-band observations
  79. BAT GRB 060204C is probably not a GRB
  80. GRB060204C: optical observation
  81. GRB 060204B: BVRi-band detections of optical afterglow
  82. GRB 060204A: Swift XRT upper limit
  83. GRB 060204A: FRAM optical observations
  84. GRB060204B: Swift/UVOT refined analysis
  85. GRB 060204C: optical observations
  86. Swift XRT Observation of GRB 060204C
  87. GRB 060204B: Swift-BAT refined analysis
  88. GRB 060204B: ART early limit
  89. GRB060204B: Swift XRT Team Refined Analysis
  90. GRB 060204C: OSN limits
  91. GRB 060204b: Keck/LRIS Afterglow Confirmation
  92. GRB 060204C: BOOTES-IR optical limits
  93. GRB 060204C: Liverpool Telescopes optical limit
  94. GRB 060204C: ROTSE-III Optical Limits
  95. GRB 060204C: Swift-BAT detection of a burst
  96. GRB 060124: Radio Observations
  97. GRB060204B: Faulkes OT candidate
  98. GRB 060204B: ART optical limit
  99. GRB 060204A: further INTEGRAL results
  100. GRB060204B, optical observation

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