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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42881 results found.

  1. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  2. Konus-Wind observation of GRB 060510A
  3. GRB060418: optical observations
  4. GRB 060428a, SMARTS optical/IR afterglow detection
  5. GRB060510B: Swift XRT refined analysis
  6. GRB 060510B: Swift-BAT Refined Analysis
  7. GRB060510A: XRT refined analysis
  8. GRB060510 - SDSS Pre-Burst Observations
  9. GRB060510B : Faulkes North Telescope detection
  10. GRB 060510b: Gemini NIR observations
  11. GRB 060510B: Super-LOTIS Observations
  12. GRB 060510b: NIR observations
  13. GRB 060510B: Coordinate correction
  14. GRB 060510B: MDM Observations and candidate OT
  15. GRB 060510B: Swift detection of a burst
  16. GRB 060510: Swift detection of a burst with optical transient
  17. GRB060507: optical afterglow detection
  18. GRB060502B: improvement in the XRT afterglow position
  19. GRB 060507: BART limit
  20. GRB 060507: Swift-BAT Refined Analysis
  21. GRB 060505: PROMPT Observations
  22. GRB 060507: Swift/UVOT Upper Limits
  23. GRB 060507: Swift XRT Team Refined Analysis
  24. GRB 060507: MDM Optical Upper Limit
  25. GRB060507: Swift XRT position
  26. GRB 060507: Swift detection of a burst
  27. GRB 060429: Suzaku WAM observation
  28. GRB060505: Swift/UVOT Observations
  29. GRB 060505: Swift XRT Team Refined Analysis
  30. GRB060425: new MASTER survey method
  31. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  32. GRB 060505: Swift XRT afterglow canditate position
  33. GRB 060502b: Second epoch Gemini observations
  34. GRB 060505: Swift-BAT detection of a weak burst
  35. GRB 060502B: optical observations
  36. GRB 060502B: AROMA refined photometric calibration
  37. GRB 060502B MDM Follow-up Observation
  38. GRB 060502b: Gemini imaging and spectroscopy
  39. GRB060502A, optical observation
  40. GRB 060502B: Swift/UVOT upper limits
  41. GRB 060502A: Swift/UVOT source detection
  42. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  43. GRB 060502B: MDM Optical Observation
  44. GRB 060502B: Refined analysis of the Swift-BAT short burst
  45. Short GRB 060502B: Tautenburg Observation
  46. GRB 060427B Milagro GeV/TeV Observations
  47. GRB 060502A: TTT Observations
  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. GRB060502: Super-LOTIS Observations
  57. GRB 060502: P60 Afterglow Confirmation
  58. GRB 060502: Swift detection of a burst with an optical counterpart
  59. GRB 060501: MDM Observations
  60. GRB060501: Super-LOTIS observations
  61. GRB060501: P60 imaging and afterglow candidate
  62. GRB 060501: Refined analysis of the Swift-BAT burst
  63. GRB060501: Swift XRT position
  64. GRB 060501: Swift detection of a burst
  65. IPN triangulation of GRB060429 (short/hard)
  66. Konus-Wind observation of GRB 060427B
  67. GRB060428B - SDSS Pre-Burst Observations
  68. GRB060428B: optical observation
  69. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  70. GRB 060428B: MDM Observations
  71. GRB 060428A: PROMPT Observations
  72. GRB 060427B: MASTER optical observations
  73. GRB060428B: Swift XRT Team refined analysis
  74. GRB 060427B: IPN localization of a short hard burst
  75. GRB 060428B: Refined analysis of the Swift-BAT burst
  76. GRB 060428B: KAIT observations
  77. GRB060425:MASTER optical limit
  78. GRB 051117A: Bright host galaxy not confirmed
  79. GRB 060428A: Refined analysis of the Swift-BAT burst
  80. GRB 060428b : Kiso R-band limit
  81. GRB 060428b: Optical afterglow candidate
  82. GRB060428A: Swift XRT Team refined analysis
  83. GRB 060428B: Swift detection of a burst
  84. GRB 060427: NIR observations
  85. GRB060427: Xinglong optical Observations
  86. GRB 060428: Swift detection of a burst
  87. GRB 060427: NOT observations
  88. GRB 060427: Refined analysis of the Swift-BAT burst
  89. GRB060427: Swift XRT Team refined analysis
  90. GRB060418: Swift XRT Team Further Refined Analysis
  91. GRB 060427: Swift detection of a burst
  92. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  93. An interactive program for GRB pseudo-redshift computations
  94. GRB060424: optical afterglow detection
  95. GRB060418: Further Analysis of MIKE Spectroscopy
  96. GRB 060424: Refined analysis of the Swift-BAT burst
  97. GRB 060424: Swift detection of a burst
  98. GRB 060421: TTT Observations
  99. OT 060420: Likely Not a New Cosmic Transient
  100. No OT 060420 in MASCOT images

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