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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"

36198 results found.

  1. GRB 060211b: P60 Observations
  2. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  3. GRB 060206: SOAR Detections
  4. GRB 050826: Optical Afterglow and Host Galaxy
  5. GRB 060210: Further refined analysis of the Swift-BAT burst
  6. GRB 060211B: Swift/BAT refined analysis
  7. GRB060210: Swift/UVOT Upper Limits
  8. GRB 060211B: Swift-XRT Team refined analysis
  9. GRB060211b: optical observation
  10. GRB 060210: Optical Observations
  11. GRB060211.7: MASTER_optical_observation under the snow
  12. GRB 060211A: Swift XRT Team Refined Analysis
  13. GRB 060211B: Swift-BAT detection of a burst
  14. GRB060211: Faulkes North observation
  15. GRB 060211: ROTSE-III Optical Limits
  16. GRB 060211: Swift detection of a long burst
  17. GRB 060210: Refined analysis of the Swift-BAT burst
  18. GRB060210: Swift XRT Refined Analysis
  19. GRB060206, optical observations
  20. GRB 060210 : Xinglong and Lulin optical limit
  21. GRB060210: Gemini absorption spectroscopy
  22. GRB 060210: optical evolution
  23. GRB060210:Faulkes Telescope North Afterglow Confirmation
  24. GRB 060210: candidate afterglow
  25. GRB 060210: Swift detection of a burst
  26. GRB 060206: Swift/UVOT Observations
  27. Swift-BAT trigger 180931 is not a GRB
  28. GRB060209: RTT150 optical observations
  29. GRB 060209 : TAROT optical observation
  30. GRB060209A: MASTER optical observation
  31. GRB 060209(?): Swift-BAT detection of a possible burst
  32. GRB 060206: near-infrared observations (JK' imaging)
  33. GRB 060206: WSRT Radio Observations
  34. GRB 060203: Swift/UVOT upper limits
  35. GRB 060206: TTT Observations
  36. GRB 060206: More PROMPT Detections
  37. GRB 060121 : WIDGET Pre-trigger limit
  38. GRB 060206: Tenagra II Observations
  39. GRB 060206: PROMPT Detections
  40. Retraction of orphan GRB afterglow candidate
  41. GRB060204a: Swift XRT Source is not GRB Afterglow
  42. GRB 060206: optical observations at Asiago
  43. Orphan GRB Afterglow candidate
  44. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  45. GRB 060206: Subaru/FOCAS optical spectroscopy
  46. GRB 060206: IR Detection of the Afterglow
  47. GRB 060206: Lick 3m Spectroscopy
  48. GRB 060204A: ROSAT Pointing
  49. GRB 060206: Super-LOTIS observations
  50. GRB060204A: Swift/UVOT observations
  51. GRB 060206: Swift-BAT refined analysis
  52. GRB 060206 : Lulin optical observations
  53. GRB060206: SDSS Pre-Burst Observations
  54. GRB060206: Swift XRT Refined Analysis
  55. GRB060206: Liverpool Telescope observation
  56. GRB 060206: Spectroscopic Redshift
  57. GRB060206: P60 Optical Observations
  58. GRB 060206: KAIT observations
  59. GRB060206: Swift XRT Position
  60. GRB060206: SARA Detection
  61. GRB 060206: RAPTOR observations of afterglow candidate variability.
  62. GRB 060206: High redshift burst
  63. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  64. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  65. BAT GRB 060204C is probably not a GRB
  66. GRB060204C: optical observation
  67. GRB 060204B: BVRi-band detections of optical afterglow
  68. GRB 060204A: Swift XRT upper limit
  69. GRB 060204A: FRAM optical observations
  70. GRB060204B: Swift/UVOT refined analysis
  71. GRB 060204C: optical observations
  72. Swift XRT Observation of GRB 060204C
  73. GRB 060204B: Swift-BAT refined analysis
  74. GRB 060204B: ART early limit
  75. GRB060204B: Swift XRT Team Refined Analysis
  76. GRB 060204C: OSN limits
  77. GRB 060204b: Keck/LRIS Afterglow Confirmation
  78. GRB 060204C: BOOTES-IR optical limits
  79. GRB 060204C: Liverpool Telescopes optical limit
  80. GRB 060204C: ROTSE-III Optical Limits
  81. GRB 060204C: Swift-BAT detection of a burst
  82. GRB 060124: Radio Observations
  83. GRB060204B: Faulkes OT candidate
  84. GRB 060204B: ART optical limit
  85. GRB 060204A: further INTEGRAL results
  86. GRB060204B - SDSS pre-burst observations
  87. GRB 060203: Swift-BAT refined analysis
  88. GRB 060204B: Swift detection of a burst
  89. GRB 060204: a long GRB detected by INTEGRAL
  90. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  91. GRB 060203: RTT150 optical observations
  92. GRB060203: Swift XRT Team Refined Analysis
  93. Swift-BAT trigger is GRB 060203
  94. GRB 060203: IR Counterpart
  95. GRB060203: Observations with SARA
  96. GRB 060203: P60 Confirmation of Optical Afterglow
  97. Possible GRB 060203: candidate optical counterpart
  98. Possible GRB 060203: optical observations at Asiago
  99. GRB 060202: PROMPT Observations
  100. GRB 060202: GETS observation

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