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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"

35993 results found.

  1. GRB 060211B: Swift/BAT refined analysis
  2. GRB060210: Swift/UVOT Upper Limits
  3. GRB 060211B: Swift-XRT Team refined analysis
  4. GRB060211b: optical observation
  5. GRB 060210: Optical Observations
  6. GRB060211.7: MASTER_optical_observation under the snow
  7. GRB 060211A: Swift XRT Team Refined Analysis
  8. GRB 060211B: Swift-BAT detection of a burst
  9. GRB060211: Faulkes North observation
  10. GRB 060211: ROTSE-III Optical Limits
  11. GRB 060211: Swift detection of a long burst
  12. GRB 060210: Refined analysis of the Swift-BAT burst
  13. GRB060210: Swift XRT Refined Analysis
  14. GRB060206, optical observations
  15. GRB 060210 : Xinglong and Lulin optical limit
  16. GRB060210: Gemini absorption spectroscopy
  17. GRB 060210: optical evolution
  18. GRB060210:Faulkes Telescope North Afterglow Confirmation
  19. GRB 060210: candidate afterglow
  20. GRB 060210: Swift detection of a burst
  21. GRB 060206: Swift/UVOT Observations
  22. Swift-BAT trigger 180931 is not a GRB
  23. GRB060209: RTT150 optical observations
  24. GRB 060209 : TAROT optical observation
  25. GRB060209A: MASTER optical observation
  26. GRB 060209(?): Swift-BAT detection of a possible burst
  27. GRB 060206: near-infrared observations (JK' imaging)
  28. GRB 060206: WSRT Radio Observations
  29. GRB 060203: Swift/UVOT upper limits
  30. GRB 060206: TTT Observations
  31. GRB 060206: More PROMPT Detections
  32. GRB 060121 : WIDGET Pre-trigger limit
  33. GRB 060206: Tenagra II Observations
  34. GRB 060206: PROMPT Detections
  35. Retraction of orphan GRB afterglow candidate
  36. GRB060204a: Swift XRT Source is not GRB Afterglow
  37. GRB 060206: optical observations at Asiago
  38. Orphan GRB Afterglow candidate
  39. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  40. GRB 060206: Subaru/FOCAS optical spectroscopy
  41. GRB 060206: IR Detection of the Afterglow
  42. GRB 060206: Lick 3m Spectroscopy
  43. GRB 060204A: ROSAT Pointing
  44. GRB 060206: Super-LOTIS observations
  45. GRB060204A: Swift/UVOT observations
  46. GRB 060206: Swift-BAT refined analysis
  47. GRB 060206 : Lulin optical observations
  48. GRB060206: SDSS Pre-Burst Observations
  49. GRB060206: Swift XRT Refined Analysis
  50. GRB060206: Liverpool Telescope observation
  51. GRB 060206: Spectroscopic Redshift
  52. GRB060206: P60 Optical Observations
  53. GRB 060206: KAIT observations
  54. GRB060206: Swift XRT Position
  55. GRB060206: SARA Detection
  56. GRB 060206: RAPTOR observations of afterglow candidate variability.
  57. GRB 060206: High redshift burst
  58. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  59. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  60. BAT GRB 060204C is probably not a GRB
  61. GRB060204C: optical observation
  62. GRB 060204B: BVRi-band detections of optical afterglow
  63. GRB 060204A: Swift XRT upper limit
  64. GRB 060204A: FRAM optical observations
  65. GRB060204B: Swift/UVOT refined analysis
  66. GRB 060204C: optical observations
  67. Swift XRT Observation of GRB 060204C
  68. GRB 060204B: Swift-BAT refined analysis
  69. GRB 060204B: ART early limit
  70. GRB060204B: Swift XRT Team Refined Analysis
  71. GRB 060204C: OSN limits
  72. GRB 060204b: Keck/LRIS Afterglow Confirmation
  73. GRB 060204C: BOOTES-IR optical limits
  74. GRB 060204C: Liverpool Telescopes optical limit
  75. GRB 060204C: ROTSE-III Optical Limits
  76. GRB 060204C: Swift-BAT detection of a burst
  77. GRB 060124: Radio Observations
  78. GRB060204B: Faulkes OT candidate
  79. GRB 060204B: ART optical limit
  80. GRB 060204A: further INTEGRAL results
  81. GRB060204B - SDSS pre-burst observations
  82. GRB 060203: Swift-BAT refined analysis
  83. GRB 060204B: Swift detection of a burst
  84. GRB 060204: a long GRB detected by INTEGRAL
  85. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  86. GRB 060203: RTT150 optical observations
  87. GRB060203: Swift XRT Team Refined Analysis
  88. Swift-BAT trigger is GRB 060203
  89. GRB 060203: IR Counterpart
  90. GRB060203: Observations with SARA
  91. GRB 060203: P60 Confirmation of Optical Afterglow
  92. Possible GRB 060203: candidate optical counterpart
  93. Possible GRB 060203: optical observations at Asiago
  94. GRB 060202: PROMPT Observations
  95. GRB 060202: GETS observation
  96. GRB 060202: Gemini-N J, H, K_s observations
  97. GRB 060202 : Kiso B and R band limit
  98. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  99. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  100. GRB 060202: Refined analysis of the Swift-BAT burst

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