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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"

36358 results found.

  1. GRB 060218: Decline in r-band flux
  2. GRB 060218: spectroscopic observations
  3. GRB 060218: Further refined analysis of the Swift-BAT burst
  4. GRB 060218: Likely an underluminous GRB
  5. GRB060218: Optical Spectroscopy of GRB-SN
  6. GRB060218: VLT spectroscopy
  7. GRB 060218: Optical Observations at Xinglong Obs.
  8. GRB 060219: SDSS galaxy inside XRT error circle
  9. GRB060218: UV Detection and Light Curves
  10. GRB060219: SARA Observations
  11. GRB 060219: Swift/UVOT Upper Limits
  12. GRB 060219: Swift-XRT Team refined analysis
  13. GRB 051221B: Swift-XRT Team Refined Analysis
  14. GRB 060219: Partial refined analysis of the Swift-BAT burst
  15. GRB060218: Radio Afterglow Discovery
  16. GRB 060219: Swift-XRT position typo correction
  17. GRB 060218: MDM Redshift
  18. GRB 060219: Swift-XRT position
  19. GRB 060218: optical/nIR observations at La Palma
  20. GRB060219: SDSS pre-burst observations
  21. GRB 060219: Swift-BAT detection of a weak burst
  22. Oddball GRB 060218, transient or GRB?
  23. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  24. Brightening of the Optical Counterpart of the Possible GRB 060218
  25. GRB 060218: MDM Observations
  26. GRB 060218: Pre-burst detection of a possible host galaxy
  27. GRB 060218A: ROTSE-III Possible Optical Flare
  28. Preliminary refined analysis of the Swift-BAT trigger 191157
  29. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  30. GRB 060211B: Swift/UVOT Upper Limits
  31. GRB060218 : SDSS pre-burst observations
  32. GRB 060218: Swift XRT Position
  33. GRB 060218: Swift-BAT detection of a possible burst
  34. GRB 060213: optical afterglow not confirmed
  35. Swift UVOT observations of GRB060213
  36. GRB 060211B: Skynet Observations
  37. GRB 060213: optical afterglow candidate
  38. GRB060213: Swift XRT observations and possible afterglow candidate
  39. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  40. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  41. GRB060213: MASTER final result
  42. GRB 060211b: WIRO NIR Observations
  43. GRB060213:_MASTER_optical_observation
  44. Konus-Wind observation of bright hard GRB 060213
  45. GRB 060213: IPN localization
  46. GRB 060210: Radio Observations
  47. GRB 060211a: WIRO NIR Observations
  48. GRB060211B: REM optical and NIR observations
  49. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  50. GRB 060211A: Further refined analysis of the Swift burst
  51. GRB060121: optical observations
  52. GRB060110: optical observations
  53. GRB060105: optical observations
  54. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  55. GRB 060211b: P60 Observations
  56. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  57. GRB 060206: SOAR Detections
  58. GRB 050826: Optical Afterglow and Host Galaxy
  59. GRB 060210: Further refined analysis of the Swift-BAT burst
  60. GRB 060211B: Swift/BAT refined analysis
  61. GRB060210: Swift/UVOT Upper Limits
  62. GRB 060211B: Swift-XRT Team refined analysis
  63. GRB060211b: optical observation
  64. GRB 060210: Optical Observations
  65. GRB060211.7: MASTER_optical_observation under the snow
  66. GRB 060211A: Swift XRT Team Refined Analysis
  67. GRB 060211B: Swift-BAT detection of a burst
  68. GRB060211: Faulkes North observation
  69. GRB 060211: ROTSE-III Optical Limits
  70. GRB 060211: Swift detection of a long burst
  71. GRB 060210: Refined analysis of the Swift-BAT burst
  72. GRB060210: Swift XRT Refined Analysis
  73. GRB060206, optical observations
  74. GRB 060210 : Xinglong and Lulin optical limit
  75. GRB060210: Gemini absorption spectroscopy
  76. GRB 060210: optical evolution
  77. GRB060210:Faulkes Telescope North Afterglow Confirmation
  78. GRB 060210: candidate afterglow
  79. GRB 060210: Swift detection of a burst
  80. GRB 060206: Swift/UVOT Observations
  81. Swift-BAT trigger 180931 is not a GRB
  82. GRB060209: RTT150 optical observations
  83. GRB 060209 : TAROT optical observation
  84. GRB060209A: MASTER optical observation
  85. GRB 060209(?): Swift-BAT detection of a possible burst
  86. GRB 060206: near-infrared observations (JK' imaging)
  87. GRB 060206: WSRT Radio Observations
  88. GRB 060203: Swift/UVOT upper limits
  89. GRB 060206: TTT Observations
  90. GRB 060206: More PROMPT Detections
  91. GRB 060121 : WIDGET Pre-trigger limit
  92. GRB 060206: Tenagra II Observations
  93. GRB 060206: PROMPT Detections
  94. Retraction of orphan GRB afterglow candidate
  95. GRB060204a: Swift XRT Source is not GRB Afterglow
  96. GRB 060206: optical observations at Asiago
  97. Orphan GRB Afterglow candidate
  98. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  99. GRB 060206: Subaru/FOCAS optical spectroscopy
  100. GRB 060206: IR Detection of the Afterglow

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