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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"

32535 results found.

  1. GRB 060515: Super-LOTIS Observations
  2. GRB060515: Swift/UVOT initial observation
  3. GRB 060515: ROTSE-III Optical Limits
  4. VLT optical spectroscopy of GRB 060512
  5. Swift/UVOT observations of GRB060512.
  6. GRB 060512: Subaru NIR observation
  7. GRB060512: Swift XRT Team refined analysis
  8. GRB 060512: 1.54m Kuiper Observations
  9. GRB 060512: Detection of NIR afterglow
  10. GRB 060512: P60 Observations
  11. GRB 060512: Swift-BAT Refined Analysis
  12. GRB 060505 - OT candidate + galaxy spectrum
  13. GRB 060512: optical decay
  14. GRB 060512: REM NIR observations
  15. GRB060512 - SDSS Pre-Burst Observations
  16. GRB060512 Name Correction: LT Afterglow detection
  17. GRB060512: Liverpool Telescope Afterglow detection
  18. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  19. GRB 060505: X-ray afterglow - Correction -
  20. GRB 060505: X-ray afterglow
  21. Konus-Wind observation of GRB 060510A
  22. GRB060418: optical observations
  23. GRB 060428a, SMARTS optical/IR afterglow detection
  24. GRB060510B: Swift XRT refined analysis
  25. GRB 060510B: Swift/UVOT Upper Limits
  26. GRB 060510A: Refined analysis of the Swift-BAT burst
  27. GRB 060510B: Swift-BAT Refined Analysis
  28. GRB060510A: XRT refined analysis
  29. GRB060510 - SDSS Pre-Burst Observations
  30. GRB 060510b: Redshift
  31. GRB060510B : Faulkes North Telescope detection
  32. GRB 060510b: Gemini NIR observations
  33. GRB 060510B: Super-LOTIS Observations
  34. GRB 060510b: NIR observations
  35. GRB 060510B: Coordinate correction
  36. GRB 060510B: MDM Observations and candidate OT
  37. GRB 060510: Swift detection of a burst with optical transient
  38. GRB060507: optical afterglow detection
  39. GRB060502B: improvement in the XRT afterglow position
  40. GRB 060507: BART limit
  41. GRB 060507: Final Refined analysis of the Swift-BAT burst
  42. GRB 060507: Swift-BAT Refined Analysis
  43. GRB 060505: PROMPT Observations
  44. GRB 060507: Swift/UVOT Upper Limits
  45. GRB 060507: Swift XRT Team Refined Analysis
  46. GRB 060507: MDM Optical Upper Limit
  47. GRB060507: Swift XRT position
  48. GRB 060429: Suzaku WAM observation
  49. GRB060505: Swift/UVOT Observations
  50. GRB 060505: Swift XRT Team Refined Analysis
  51. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  52. GRB 060505: Swift XRT afterglow canditate position
  53. GRB 060502b: Second epoch Gemini observations
  54. GRB 060428B: spectroscopy
  55. GRB 060502B: optical observations
  56. GRB 060502B: AROMA refined photometric calibration
  57. GRB 060502B MDM Follow-up Observation
  58. GRB 060502b: Gemini imaging and spectroscopy
  59. GRB060502A, optical observation
  60. GRB 060502B: Swift/UVOT upper limits
  61. GRB 060502A: Swift/UVOT source detection
  62. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  63. GRB 060502B: MDM Optical Observation
  64. GRB 060502B: AROMA optical observations
  65. GRB 060502B: Refined analysis of the Swift-BAT short burst
  66. GRB060502B: Swift XRT Team refined analysis
  67. Short GRB 060502B: Tautenburg Observation
  68. GRB 060427B Milagro GeV/TeV Observations
  69. GRB 060502A: TTT Observations
  70. GRB060502B: correction to XRT position
  71. GRB 060501: P60 Observations and Candidate Retraction
  72. GRB 060502B: Xinglong optical observation
  73. GRB060502: Swift-XRT refined analysis
  74. GRB 060502: Swift-BAT refined analysis
  75. GRB060502: Gemini spectroscopy
  76. GRB 060502: APO Spectroscopic Observations
  77. GRB060501: Swift UVOT followup observations
  78. GRB060502: Super-LOTIS Observations
  79. GRB 060502: P60 Afterglow Confirmation
  80. GRB 060501: MDM Observations
  81. GRB060501: Super-LOTIS observations
  82. GRB060501: P60 imaging and afterglow candidate
  83. GRB 060501: Refined analysis of the Swift-BAT burst
  84. GRB 060501: ROTSE-III Optical Limits
  85. Konus-Wind observation of GRB 060427B
  86. GRB060428B - SDSS Pre-Burst Observations
  87. GRB060428B: optical observation
  88. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  89. GRB 060428B: MDM Observations
  90. GRB 060428A: PROMPT Observations
  91. GRB060428B: Swift XRT Team refined analysis
  92. GRB 060428B: Refined analysis of the Swift-BAT burst
  93. GRB 060428B: Xinglong I-band limit
  94. GRB 060428B: KAIT observations
  95. GRB 051117A: Bright host galaxy not confirmed
  96. GRB060428A: Swift/UVOT observations.
  97. GRB060428B, optical observation
  98. GRB 060428A: Refined analysis of the Swift-BAT burst
  99. GRB 060428b : Kiso R-band limit
  100. GRB 060428b: Optical afterglow candidate

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