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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"

36042 results found.

  1. GRB 060218A: ROTSE-III Possible Optical Flare
  2. Preliminary refined analysis of the Swift-BAT trigger 191157
  3. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  4. GRB 060211B: Swift/UVOT Upper Limits
  5. GRB060218 : SDSS pre-burst observations
  6. GRB 060218: Swift XRT Position
  7. GRB 060218: Swift-BAT detection of a possible burst
  8. GRB 060213: optical afterglow not confirmed
  9. Swift UVOT observations of GRB060213
  10. GRB 060211B: Skynet Observations
  11. GRB 060213: optical afterglow candidate
  12. GRB060213: Swift XRT observations and possible afterglow candidate
  13. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  14. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  15. GRB060213: MASTER final result
  16. GRB 060211b: WIRO NIR Observations
  17. GRB060213:_MASTER_optical_observation
  18. Konus-Wind observation of bright hard GRB 060213
  19. GRB 060213: IPN localization
  20. GRB 060210: Radio Observations
  21. GRB 060211a: WIRO NIR Observations
  22. GRB060211B: REM optical and NIR observations
  23. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  24. GRB 060211A: Further refined analysis of the Swift burst
  25. GRB060121: optical observations
  26. GRB060110: optical observations
  27. GRB060105: optical observations
  28. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  29. GRB 060211b: P60 Observations
  30. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  31. GRB 060206: SOAR Detections
  32. GRB 050826: Optical Afterglow and Host Galaxy
  33. GRB 060210: Further refined analysis of the Swift-BAT burst
  34. GRB 060211B: Swift/BAT refined analysis
  35. GRB060210: Swift/UVOT Upper Limits
  36. GRB 060211B: Swift-XRT Team refined analysis
  37. GRB060211b: optical observation
  38. GRB 060210: Optical Observations
  39. GRB060211.7: MASTER_optical_observation under the snow
  40. GRB 060211A: Swift XRT Team Refined Analysis
  41. GRB 060211B: Swift-BAT detection of a burst
  42. GRB060211: Faulkes North observation
  43. GRB 060211: ROTSE-III Optical Limits
  44. GRB 060211: Swift detection of a long burst
  45. GRB 060210: Refined analysis of the Swift-BAT burst
  46. GRB060210: Swift XRT Refined Analysis
  47. GRB060206, optical observations
  48. GRB 060210 : Xinglong and Lulin optical limit
  49. GRB060210: Gemini absorption spectroscopy
  50. GRB 060210: optical evolution
  51. GRB060210:Faulkes Telescope North Afterglow Confirmation
  52. GRB 060210: candidate afterglow
  53. GRB 060210: Swift detection of a burst
  54. GRB 060206: Swift/UVOT Observations
  55. Swift-BAT trigger 180931 is not a GRB
  56. GRB060209: RTT150 optical observations
  57. GRB 060209 : TAROT optical observation
  58. GRB060209A: MASTER optical observation
  59. GRB 060209(?): Swift-BAT detection of a possible burst
  60. GRB 060206: near-infrared observations (JK' imaging)
  61. GRB 060206: WSRT Radio Observations
  62. GRB 060203: Swift/UVOT upper limits
  63. GRB 060206: TTT Observations
  64. GRB 060206: More PROMPT Detections
  65. GRB 060121 : WIDGET Pre-trigger limit
  66. GRB 060206: Tenagra II Observations
  67. GRB 060206: PROMPT Detections
  68. Retraction of orphan GRB afterglow candidate
  69. GRB060204a: Swift XRT Source is not GRB Afterglow
  70. GRB 060206: optical observations at Asiago
  71. Orphan GRB Afterglow candidate
  72. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  73. GRB 060206: Subaru/FOCAS optical spectroscopy
  74. GRB 060206: IR Detection of the Afterglow
  75. GRB 060206: Lick 3m Spectroscopy
  76. GRB 060204A: ROSAT Pointing
  77. GRB 060206: Super-LOTIS observations
  78. GRB060204A: Swift/UVOT observations
  79. GRB 060206: Swift-BAT refined analysis
  80. GRB 060206 : Lulin optical observations
  81. GRB060206: SDSS Pre-Burst Observations
  82. GRB060206: Swift XRT Refined Analysis
  83. GRB060206: Liverpool Telescope observation
  84. GRB 060206: Spectroscopic Redshift
  85. GRB060206: P60 Optical Observations
  86. GRB 060206: KAIT observations
  87. GRB060206: Swift XRT Position
  88. GRB060206: SARA Detection
  89. GRB 060206: RAPTOR observations of afterglow candidate variability.
  90. GRB 060206: High redshift burst
  91. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  92. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  93. BAT GRB 060204C is probably not a GRB
  94. GRB060204C: optical observation
  95. GRB 060204B: BVRi-band detections of optical afterglow
  96. GRB 060204A: Swift XRT upper limit
  97. GRB 060204A: FRAM optical observations
  98. GRB060204B: Swift/UVOT refined analysis
  99. GRB 060204C: optical observations
  100. Swift XRT Observation of GRB 060204C

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