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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"

36010 results found.

  1. GRB060213:_MASTER_optical_observation
  2. Konus-Wind observation of bright hard GRB 060213
  3. GRB 060213: IPN localization
  4. GRB 060210: Radio Observations
  5. GRB 060211a: WIRO NIR Observations
  6. GRB060211B: REM optical and NIR observations
  7. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  8. GRB 060211A: Further refined analysis of the Swift burst
  9. GRB060121: optical observations
  10. GRB060110: optical observations
  11. GRB060105: optical observations
  12. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  13. GRB 060211b: P60 Observations
  14. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  15. GRB 060206: SOAR Detections
  16. GRB 050826: Optical Afterglow and Host Galaxy
  17. GRB 060210: Further refined analysis of the Swift-BAT burst
  18. GRB 060211B: Swift/BAT refined analysis
  19. GRB060210: Swift/UVOT Upper Limits
  20. GRB 060211B: Swift-XRT Team refined analysis
  21. GRB060211b: optical observation
  22. GRB 060210: Optical Observations
  23. GRB060211.7: MASTER_optical_observation under the snow
  24. GRB 060211A: Swift XRT Team Refined Analysis
  25. GRB 060211B: Swift-BAT detection of a burst
  26. GRB060211: Faulkes North observation
  27. GRB 060211: ROTSE-III Optical Limits
  28. GRB 060211: Swift detection of a long burst
  29. GRB 060210: Refined analysis of the Swift-BAT burst
  30. GRB060210: Swift XRT Refined Analysis
  31. GRB060206, optical observations
  32. GRB 060210 : Xinglong and Lulin optical limit
  33. GRB060210: Gemini absorption spectroscopy
  34. GRB 060210: optical evolution
  35. GRB060210:Faulkes Telescope North Afterglow Confirmation
  36. GRB 060210: candidate afterglow
  37. GRB 060210: Swift detection of a burst
  38. GRB 060206: Swift/UVOT Observations
  39. Swift-BAT trigger 180931 is not a GRB
  40. GRB060209: RTT150 optical observations
  41. GRB 060209 : TAROT optical observation
  42. GRB060209A: MASTER optical observation
  43. GRB 060209(?): Swift-BAT detection of a possible burst
  44. GRB 060206: near-infrared observations (JK' imaging)
  45. GRB 060206: WSRT Radio Observations
  46. GRB 060203: Swift/UVOT upper limits
  47. GRB 060206: TTT Observations
  48. GRB 060206: More PROMPT Detections
  49. GRB 060121 : WIDGET Pre-trigger limit
  50. GRB 060206: Tenagra II Observations
  51. GRB 060206: PROMPT Detections
  52. Retraction of orphan GRB afterglow candidate
  53. GRB060204a: Swift XRT Source is not GRB Afterglow
  54. GRB 060206: optical observations at Asiago
  55. Orphan GRB Afterglow candidate
  56. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  57. GRB 060206: Subaru/FOCAS optical spectroscopy
  58. GRB 060206: IR Detection of the Afterglow
  59. GRB 060206: Lick 3m Spectroscopy
  60. GRB 060204A: ROSAT Pointing
  61. GRB 060206: Super-LOTIS observations
  62. GRB060204A: Swift/UVOT observations
  63. GRB 060206: Swift-BAT refined analysis
  64. GRB 060206 : Lulin optical observations
  65. GRB060206: SDSS Pre-Burst Observations
  66. GRB060206: Swift XRT Refined Analysis
  67. GRB060206: Liverpool Telescope observation
  68. GRB 060206: Spectroscopic Redshift
  69. GRB060206: P60 Optical Observations
  70. GRB 060206: KAIT observations
  71. GRB060206: Swift XRT Position
  72. GRB060206: SARA Detection
  73. GRB 060206: RAPTOR observations of afterglow candidate variability.
  74. GRB 060206: High redshift burst
  75. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  76. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  77. BAT GRB 060204C is probably not a GRB
  78. GRB060204C: optical observation
  79. GRB 060204B: BVRi-band detections of optical afterglow
  80. GRB 060204A: Swift XRT upper limit
  81. GRB 060204A: FRAM optical observations
  82. GRB060204B: Swift/UVOT refined analysis
  83. GRB 060204C: optical observations
  84. Swift XRT Observation of GRB 060204C
  85. GRB 060204B: Swift-BAT refined analysis
  86. GRB 060204B: ART early limit
  87. GRB060204B: Swift XRT Team Refined Analysis
  88. GRB 060204C: OSN limits
  89. GRB 060204b: Keck/LRIS Afterglow Confirmation
  90. GRB 060204C: BOOTES-IR optical limits
  91. GRB 060204C: Liverpool Telescopes optical limit
  92. GRB 060204C: ROTSE-III Optical Limits
  93. GRB 060204C: Swift-BAT detection of a burst
  94. GRB 060124: Radio Observations
  95. GRB060204B: Faulkes OT candidate
  96. GRB 060204B: ART optical limit
  97. GRB 060204A: further INTEGRAL results
  98. GRB060204B - SDSS pre-burst observations
  99. GRB 060203: Swift-BAT refined analysis
  100. GRB 060204B: Swift detection of a burst

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