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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"

32494 results found.

  1. GRB 060507: Swift-BAT Refined Analysis
  2. GRB 060505: PROMPT Observations
  3. GRB 060507: Swift/UVOT Upper Limits
  4. GRB 060507: Swift XRT Team Refined Analysis
  5. GRB 060507: MDM Optical Upper Limit
  6. GRB060507: Swift XRT position
  7. GRB 060429: Suzaku WAM observation
  8. GRB060505: Swift/UVOT Observations
  9. GRB 060505: Swift XRT Team Refined Analysis
  10. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  11. GRB 060505: Swift XRT afterglow canditate position
  12. GRB 060502b: Second epoch Gemini observations
  13. GRB 060428B: spectroscopy
  14. GRB 060502B: optical observations
  15. GRB 060502B: AROMA refined photometric calibration
  16. GRB 060502B MDM Follow-up Observation
  17. GRB 060502b: Gemini imaging and spectroscopy
  18. GRB060502A, optical observation
  19. GRB 060502B: Swift/UVOT upper limits
  20. GRB 060502A: Swift/UVOT source detection
  21. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  22. GRB 060502B: MDM Optical Observation
  23. GRB 060502B: AROMA optical observations
  24. GRB 060502B: Refined analysis of the Swift-BAT short burst
  25. GRB060502B: Swift XRT Team refined analysis
  26. Short GRB 060502B: Tautenburg Observation
  27. GRB 060427B Milagro GeV/TeV Observations
  28. GRB 060502A: TTT Observations
  29. GRB060502B: correction to XRT position
  30. GRB 060501: P60 Observations and Candidate Retraction
  31. GRB 060502B: Xinglong optical observation
  32. GRB060502: Swift-XRT refined analysis
  33. GRB 060502: Swift-BAT refined analysis
  34. GRB060502: Gemini spectroscopy
  35. GRB 060502: APO Spectroscopic Observations
  36. GRB060501: Swift UVOT followup observations
  37. GRB060502: Super-LOTIS Observations
  38. GRB 060502: P60 Afterglow Confirmation
  39. GRB 060501: MDM Observations
  40. GRB060501: Super-LOTIS observations
  41. GRB060501: P60 imaging and afterglow candidate
  42. GRB 060501: Refined analysis of the Swift-BAT burst
  43. GRB 060501: ROTSE-III Optical Limits
  44. Konus-Wind observation of GRB 060427B
  45. GRB060428B - SDSS Pre-Burst Observations
  46. GRB060428B: optical observation
  47. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  48. GRB 060428B: MDM Observations
  49. GRB 060428A: PROMPT Observations
  50. GRB060428B: Swift XRT Team refined analysis
  51. GRB 060428B: Refined analysis of the Swift-BAT burst
  52. GRB 060428B: Xinglong I-band limit
  53. GRB 060428B: KAIT observations
  54. GRB 051117A: Bright host galaxy not confirmed
  55. GRB060428A: Swift/UVOT observations.
  56. GRB060428B, optical observation
  57. GRB 060428A: Refined analysis of the Swift-BAT burst
  58. GRB 060428b : Kiso R-band limit
  59. GRB 060428b: Optical afterglow candidate
  60. GRB060428A: Swift XRT Team refined analysis
  61. GRB 060427: NIR observations
  62. GRB060427: Xinglong optical Observations
  63. GRB 060427: Swift/UVOT upper limits.
  64. GRB 060427: Refined analysis of the Swift-BAT burst
  65. GRB060427: Swift XRT Team refined analysis
  66. GRB060418: Swift XRT Team Further Refined Analysis
  67. GRB 060427, optical observation
  68. GRB060424: optical afterglow detection
  69. GRB060418: Further Analysis of MIKE Spectroscopy
  70. GRB 060424: Refined analysis of the Swift-BAT burst
  71. GRB 060421: TTT Observations
  72. OT 060420: Likely Not a New Cosmic Transient
  73. No OT 060420 in MASCOT images
  74. GRB060421: Swift/UVOT observations
  75. GRB 060421: Swift-BAT Refined Analysis
  76. GRB 060421: Swift-XRT refined analysis
  77. GRB 060418: prediction of t_break
  78. GRB060418: optical observations
  79. Konus-Wind observation of GRB 060418
  80. Possible GRB060421: BART limits
  81. Erratum of GCN 4983 for GRB 060418 IR follow-up
  82. GRB 060418 : IR afterglow observations
  83. GRB 060418 : Lulin Optical follow-up
  84. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  85. GRB 060418: Radio Observations
  86. GRB060418, BVRcIc field calibration
  87. GRB060418: Swift/UVOT Observations
  88. GRB060418: Optical Observations
  89. GRB 060418: FRAM early afterglow observation
  90. GRB 060418: Refined Analysis of the Swift-BAT burst
  91. VLT/UVES observations of GRB060418
  92. GRB 060418, SMARTS continuing afterglow observations
  93. GRB 060418: PROMPT Detections
  94. GRB 060418, SMARTS optical/IR afterglow observations
  95. GRB060418: Magellan/MIKE Spectroscopic Redshift
  96. GRB060418 : LT optical afterglow observation
  97. GRB 060418: REM candidate afterglow
  98. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  99. GRB060413: Swift/UVOT upper limits
  100. GRB 060413: REM NIR Observations

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