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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"

36039 results found.

  1. GRB 060219: Partial refined analysis of the Swift-BAT burst
  2. GRB060218: Radio Afterglow Discovery
  3. GRB 060219: Swift-XRT position typo correction
  4. GRB 060218: MDM Redshift
  5. GRB 060219: Swift-XRT position
  6. GRB 060218: optical/nIR observations at La Palma
  7. GRB060219: SDSS pre-burst observations
  8. GRB 060219: Swift-BAT detection of a weak burst
  9. Oddball GRB 060218, transient or GRB?
  10. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  11. Brightening of the Optical Counterpart of the Possible GRB 060218
  12. GRB 060218: MDM Observations
  13. GRB 060218: Pre-burst detection of a possible host galaxy
  14. GRB 060218A: ROTSE-III Possible Optical Flare
  15. Preliminary refined analysis of the Swift-BAT trigger 191157
  16. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  17. GRB 060211B: Swift/UVOT Upper Limits
  18. GRB060218 : SDSS pre-burst observations
  19. GRB 060218: Swift XRT Position
  20. GRB 060218: Swift-BAT detection of a possible burst
  21. GRB 060213: optical afterglow not confirmed
  22. Swift UVOT observations of GRB060213
  23. GRB 060211B: Skynet Observations
  24. GRB 060213: optical afterglow candidate
  25. GRB060213: Swift XRT observations and possible afterglow candidate
  26. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  27. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  28. GRB060213: MASTER final result
  29. GRB 060211b: WIRO NIR Observations
  30. GRB060213:_MASTER_optical_observation
  31. Konus-Wind observation of bright hard GRB 060213
  32. GRB 060213: IPN localization
  33. GRB 060210: Radio Observations
  34. GRB 060211a: WIRO NIR Observations
  35. GRB060211B: REM optical and NIR observations
  36. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  37. GRB 060211A: Further refined analysis of the Swift burst
  38. GRB060121: optical observations
  39. GRB060110: optical observations
  40. GRB060105: optical observations
  41. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  42. GRB 060211b: P60 Observations
  43. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  44. GRB 060206: SOAR Detections
  45. GRB 050826: Optical Afterglow and Host Galaxy
  46. GRB 060210: Further refined analysis of the Swift-BAT burst
  47. GRB 060211B: Swift/BAT refined analysis
  48. GRB060210: Swift/UVOT Upper Limits
  49. GRB 060211B: Swift-XRT Team refined analysis
  50. GRB060211b: optical observation
  51. GRB 060210: Optical Observations
  52. GRB060211.7: MASTER_optical_observation under the snow
  53. GRB 060211A: Swift XRT Team Refined Analysis
  54. GRB 060211B: Swift-BAT detection of a burst
  55. GRB060211: Faulkes North observation
  56. GRB 060211: ROTSE-III Optical Limits
  57. GRB 060211: Swift detection of a long burst
  58. GRB 060210: Refined analysis of the Swift-BAT burst
  59. GRB060210: Swift XRT Refined Analysis
  60. GRB060206, optical observations
  61. GRB 060210 : Xinglong and Lulin optical limit
  62. GRB060210: Gemini absorption spectroscopy
  63. GRB 060210: optical evolution
  64. GRB060210:Faulkes Telescope North Afterglow Confirmation
  65. GRB 060210: candidate afterglow
  66. GRB 060210: Swift detection of a burst
  67. GRB 060206: Swift/UVOT Observations
  68. Swift-BAT trigger 180931 is not a GRB
  69. GRB060209: RTT150 optical observations
  70. GRB 060209 : TAROT optical observation
  71. GRB060209A: MASTER optical observation
  72. GRB 060209(?): Swift-BAT detection of a possible burst
  73. GRB 060206: near-infrared observations (JK' imaging)
  74. GRB 060206: WSRT Radio Observations
  75. GRB 060203: Swift/UVOT upper limits
  76. GRB 060206: TTT Observations
  77. GRB 060206: More PROMPT Detections
  78. GRB 060121 : WIDGET Pre-trigger limit
  79. GRB 060206: Tenagra II Observations
  80. GRB 060206: PROMPT Detections
  81. Retraction of orphan GRB afterglow candidate
  82. GRB060204a: Swift XRT Source is not GRB Afterglow
  83. GRB 060206: optical observations at Asiago
  84. Orphan GRB Afterglow candidate
  85. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  86. GRB 060206: Subaru/FOCAS optical spectroscopy
  87. GRB 060206: IR Detection of the Afterglow
  88. GRB 060206: Lick 3m Spectroscopy
  89. GRB 060204A: ROSAT Pointing
  90. GRB 060206: Super-LOTIS observations
  91. GRB060204A: Swift/UVOT observations
  92. GRB 060206: Swift-BAT refined analysis
  93. GRB 060206 : Lulin optical observations
  94. GRB060206: SDSS Pre-Burst Observations
  95. GRB060206: Swift XRT Refined Analysis
  96. GRB060206: Liverpool Telescope observation
  97. GRB 060206: Spectroscopic Redshift
  98. GRB060206: P60 Optical Observations
  99. GRB 060206: KAIT observations
  100. GRB060206: Swift XRT Position

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