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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"
  1. GRB060510 - SDSS Pre-Burst Observations
  2. GRB 060510b: Redshift
  3. GRB060510B : Faulkes North Telescope detection
  4. GRB 060510B : Planned XMM-Newton observation
  5. GRB 060510b: Gemini NIR observations
  6. GRB 060510B: Super-LOTIS Observations
  7. GRB 060510b: NIR observations
  8. GRB 060510B: Coordinate correction
  9. GRB 060510B: MDM Observations and candidate OT
  10. GRB 060510B: Swift detection of a burst
  11. GRB 060510: Swift detection of a burst with optical transient
  12. GRB060507: optical afterglow detection
  13. GRB060502B: improvement in the XRT afterglow position
  14. GRB 060507: BART limit
  15. GRB 060507: Final Refined analysis of the Swift-BAT burst
  16. GRB 060507: Swift-BAT Refined Analysis
  17. GRB 060505: PROMPT Observations
  18. GRB 060507: Swift/UVOT Upper Limits
  19. GRB 060507: Swift XRT Team Refined Analysis
  20. GRB 060507: MDM Optical Upper Limit
  21. GRB060507: Swift XRT position
  22. GRB 060507: Swift detection of a burst
  23. GRB 060429: Suzaku WAM observation
  24. GRB060505: Swift/UVOT Observations
  25. GRB 060505: Swift XRT Team Refined Analysis
  26. GRB060425: new MASTER survey method
  27. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  28. GRB 060505: Swift XRT afterglow canditate position
  29. GRB 060502b: Second epoch Gemini observations
  30. GRB 060505: Swift-BAT detection of a weak burst
  31. GRB 060428B: spectroscopy
  32. GRB 060502B: optical observations
  33. GRB 060502B: AROMA refined photometric calibration
  34. GRB 060502B MDM Follow-up Observation
  35. GRB 060502b: Gemini imaging and spectroscopy
  36. GRB060502A, optical observation
  37. GRB 060502B: Swift/UVOT upper limits
  38. GRB 060502A: Swift/UVOT source detection
  39. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  40. GRB 060502B: MDM Optical Observation
  41. GRB 060502B: AROMA optical observations
  42. GRB 060502B: Refined analysis of the Swift-BAT short burst
  43. GRB060502B: Swift XRT Team refined analysis
  44. Short GRB 060502B: Tautenburg Observation
  45. GRB 060427B Milagro GeV/TeV Observations
  46. GRB 060502A: TTT Observations
  47. GRB060502B: correction to XRT position
  48. GRB 060501: P60 Observations and Candidate Retraction
  49. GRB 060502B: Xinglong optical observation
  50. GRB 060502B: MASTER optical observations
  51. GRB 060502B: Swift detection of a short burst
  52. GRB060502: Swift-XRT refined analysis
  53. GRB 060502: Swift-BAT refined analysis
  54. GRB060502: Gemini spectroscopy
  55. GRB 060502: APO Spectroscopic Observations
  56. GRB060501: Swift UVOT followup observations
  57. GRB060502: Super-LOTIS Observations
  58. GRB 060502: P60 Afterglow Confirmation
  59. GRB 060502: Swift detection of a burst with an optical counterpart
  60. GRB 060501: MDM Observations
  61. GRB060501: Super-LOTIS observations
  62. GRB060501: P60 imaging and afterglow candidate
  63. GRB 060501: Refined analysis of the Swift-BAT burst
  64. GRB060501: Swift XRT position
  65. GRB 060501: ROTSE-III Optical Limits
  66. GRB 060501: Swift detection of a burst
  67. IPN triangulation of GRB060429 (short/hard)
  68. Konus-Wind observation of GRB 060427B
  69. GRB060428B - SDSS Pre-Burst Observations
  70. GRB060428B: optical observation
  71. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  72. GRB 060428B: MDM Observations
  73. GRB 060428A: PROMPT Observations
  74. GRB 060427B: MASTER optical observations
  75. GRB060428B: Swift XRT Team refined analysis
  76. GRB 060427B: IPN localization of a short hard burst
  77. GRB 060428B: Refined analysis of the Swift-BAT burst
  78. GRB 060428B: Xinglong I-band limit
  79. GRB 060428B: KAIT observations
  80. GRB060425:MASTER optical limit
  81. GRB 051117A: Bright host galaxy not confirmed
  82. GRB060428A: Swift/UVOT observations.
  83. GRB060428B, optical observation
  84. GRB 060428A: Refined analysis of the Swift-BAT burst
  85. GRB 060428b : Kiso R-band limit
  86. GRB060427:MASTER optical limit
  87. GRB 060428b: Optical afterglow candidate
  88. GRB060428A: Swift XRT Team refined analysis
  89. GRB 060428B: Swift detection of a burst
  90. GRB 060427: NIR observations
  91. GRB060427: Xinglong optical Observations
  92. GRB 060428: Swift detection of a burst
  93. GRB 060427: NOT observations
  94. GRB 060427: Swift/UVOT upper limits.
  95. GRB 060427: Refined analysis of the Swift-BAT burst
  96. GRB060427: Swift XRT Team refined analysis
  97. GRB060418: Swift XRT Team Further Refined Analysis
  98. GRB060425:MASTER survey observations
  99. GRB 060427, optical observation
  100. GRB 060427: Swift detection of a burst

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