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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"

36329 results found.

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

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