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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"

31730 results found.

  1. GRB 060512: Subaru NIR observation
  2. GRB060512: Swift XRT Team refined analysis
  3. GRB 060512: 1.54m Kuiper Observations
  4. GRB 060512: Detection of NIR afterglow
  5. GRB 060512: P60 Observations
  6. GRB 060512: Swift-BAT Refined Analysis
  7. GRB 060505 - OT candidate + galaxy spectrum
  8. GRB 060512: optical decay
  9. GRB 060512: REM NIR observations
  10. GRB060512 - SDSS Pre-Burst Observations
  11. GRB060512 Name Correction: LT Afterglow detection
  12. GRB060512: Liverpool Telescope Afterglow detection
  13. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  14. GRB 060505: X-ray afterglow - Correction -
  15. GRB 060505: X-ray afterglow
  16. Konus-Wind observation of GRB 060510A
  17. GRB060418: optical observations
  18. GRB 060428a, SMARTS optical/IR afterglow detection
  19. GRB060510B: Swift XRT refined analysis
  20. GRB 060510B: Swift/UVOT Upper Limits
  21. GRB 060510A: Refined analysis of the Swift-BAT burst
  22. GRB 060510B: Swift-BAT Refined Analysis
  23. GRB060510A: XRT refined analysis
  24. GRB060510 - SDSS Pre-Burst Observations
  25. GRB 060510b: Redshift
  26. GRB060510B : Faulkes North Telescope detection
  27. GRB 060510b: Gemini NIR observations
  28. GRB 060510B: Super-LOTIS Observations
  29. GRB 060510b: NIR observations
  30. GRB 060510B: Coordinate correction
  31. GRB 060510B: MDM Observations and candidate OT
  32. GRB 060510: Swift detection of a burst with optical transient
  33. GRB060507: optical afterglow detection
  34. GRB060502B: improvement in the XRT afterglow position
  35. GRB 060507: BART limit
  36. GRB 060507: Final Refined analysis of the Swift-BAT burst
  37. GRB 060507: Swift-BAT Refined Analysis
  38. GRB 060505: PROMPT Observations
  39. GRB 060507: Swift/UVOT Upper Limits
  40. GRB 060507: Swift XRT Team Refined Analysis
  41. GRB 060507: MDM Optical Upper Limit
  42. GRB060507: Swift XRT position
  43. GRB 060429: Suzaku WAM observation
  44. GRB060505: Swift/UVOT Observations
  45. GRB 060505: Swift XRT Team Refined Analysis
  46. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  47. GRB 060505: Swift XRT afterglow canditate position
  48. GRB 060502b: Second epoch Gemini observations
  49. GRB 060428B: spectroscopy
  50. GRB 060502B: optical observations
  51. GRB 060502B: AROMA refined photometric calibration
  52. GRB 060502B MDM Follow-up Observation
  53. GRB 060502b: Gemini imaging and spectroscopy
  54. GRB060502A, optical observation
  55. GRB 060502B: Swift/UVOT upper limits
  56. GRB 060502A: Swift/UVOT source detection
  57. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  58. GRB 060502B: MDM Optical Observation
  59. GRB 060502B: AROMA optical observations
  60. GRB 060502B: Refined analysis of the Swift-BAT short burst
  61. GRB060502B: Swift XRT Team refined analysis
  62. Short GRB 060502B: Tautenburg Observation
  63. GRB 060427B Milagro GeV/TeV Observations
  64. GRB 060502A: TTT Observations
  65. GRB060502B: correction to XRT position
  66. GRB 060501: P60 Observations and Candidate Retraction
  67. GRB 060502B: Xinglong optical observation
  68. GRB060502: Swift-XRT refined analysis
  69. GRB 060502: Swift-BAT refined analysis
  70. GRB060502: Gemini spectroscopy
  71. GRB 060502: APO Spectroscopic Observations
  72. GRB060501: Swift UVOT followup observations
  73. GRB060502: Super-LOTIS Observations
  74. GRB 060502: P60 Afterglow Confirmation
  75. GRB 060501: MDM Observations
  76. GRB060501: Super-LOTIS observations
  77. GRB060501: P60 imaging and afterglow candidate
  78. GRB 060501: Refined analysis of the Swift-BAT burst
  79. GRB 060501: ROTSE-III Optical Limits
  80. Konus-Wind observation of GRB 060427B
  81. GRB060428B - SDSS Pre-Burst Observations
  82. GRB060428B: optical observation
  83. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  84. GRB 060428B: MDM Observations
  85. GRB 060428A: PROMPT Observations
  86. GRB060428B: Swift XRT Team refined analysis
  87. GRB 060428B: Refined analysis of the Swift-BAT burst
  88. GRB 060428B: Xinglong I-band limit
  89. GRB 060428B: KAIT observations
  90. GRB 051117A: Bright host galaxy not confirmed
  91. GRB060428A: Swift/UVOT observations.
  92. GRB060428B, optical observation
  93. GRB 060428A: Refined analysis of the Swift-BAT burst
  94. GRB 060428b : Kiso R-band limit
  95. GRB 060428b: Optical afterglow candidate
  96. GRB060428A: Swift XRT Team refined analysis
  97. GRB 060427: NIR observations
  98. GRB060427: Xinglong optical Observations
  99. GRB 060427: Swift/UVOT upper limits.
  100. GRB 060427: Refined analysis of the Swift-BAT burst

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