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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"

26348 results found.

  1. GRB051109A - radio observations
  2. GRB 051109B: Swift-BAT refined analysis
  3. GRB 051109A: Swift-UVOT Observations
  4. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  5. GRB051109B: no UVOT source detected
  6. GRB051109B: XRT refined analysis
  7. GRB 051109B : Lulin Optical Observations
  8. GRB 051109A : Lulin BVRI Optical afterglow observation
  9. GRB051109A: further steepening in the X-ray light curve
  10. GRB051109A: XRT refined analysis
  11. GRB 051109B: Super-LOTIS Observations
  12. GRB051105B: REM Optical observation
  13. GRB 051109B: Swift detection of a burst
  14. GRB 051109: Rc and Ic observations
  15. GRB 051109: Swift-BAT refined analysis
  16. GRB 051109a: IR Photometry and Astrometry
  17. GRB051109: Swift detection of a burst
  18. GRB 051109a: IR Detections
  19. GRB051105B: Swift/XRT upper limit
  20. GRB051105B: Swift/UVOT upper limit
  21. GRB051103: MASTER: OT limit and host galaxy candidates
  22. GRB051028: Swift-XRT refined analysis
  23. GRB 051105a, observation from Naini Tal and OSN
  24. GRB 051105a: MDM Observations
  25. GRB 051105A: TNG optical observations
  26. GRB051105A: Swift/UVOT Observations
  27. GRB 051105A, radio observations
  28. GRB051103:_MASTER_optical_observations
  29. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  30. GRB 051105A, optical observations
  31. XRT observations of GRB 051105A
  32. GRB 051105b: ART optical limits
  33. GRB 051105B (INTEGRAL 2701): Optical observation
  34. GRB 051105: Swift detection of a short burst
  35. Recent GRB UBVRcIc field photometry
  36. GRB051028 SARA Observation
  37. GRB051028: optical observations
  38. GRB051028: Swift/UVOT upper limits
  39. GRB051028: Swift XRT Position
  40. GRB051028:MASTER observations
  41. GRB051021B: Swift/UVOT Upper limits
  42. GRB 051021, Optical Observations
  43. GRB 051022: XRT Refined Spectral and Temporal Analysis
  44. GRB051012: Swift-XRT analysis
  45. GRB051021B: Swift XRT refined analysis
  46. GRB 051022, mm counterpart
  47. GRB 051022: Swift/UVOT Upper Limits
  48. GRB051022: Radio Counterpart
  49. GRB051022: IR observations
  50. GRB051021A: Swift XRT refined analysis
  51. GRB051022: Optical Observations
  52. GRB051021b: Magellan IR Imaging
  53. GRB 051021, SMARTS optical/IR observations
  54. GRB051022: Swift XRT Position
  55. GRB 051021: P200 Ks Observations
  56. GRB 051022 (=H3950): SXC Flight Localization is Valid
  57. GRB051021: Swift/UVOT Upper Limits
  58. GRB 051021B: Refined analysis of the Swift-BAT burst
  59. GRB 051022: SSO40 Optical Observations
  60. GRB051022,optical observation
  61. GRB 051021,optical observation
  62. GRB 051021B: Swift detection of a burst
  63. GRB 051021 : optical afterglow observation at Lulin
  64. GRB 051021: Optical observations and candidate afterglow
  65. GRB051021.63
  66. GRB051021.6: MASTER optical observation
  67. GRB051021: A GRB Localized by HETE
  68. Swift-BAT triggered on a posible CR Shower or possible GRB
  69. GRB 051016b: Optical limit
  70. Afterglow candidate of GRB 051016B observed at Lulin
  71. GRB 051016A: Swift/UVOT upper limits
  72. GRB 051016B: refined analysis of the Swift/XRT data
  73. GRB 051016B: Swift/UVOT detection
  74. GRB 051016B,optical observation
  75. GRB 051016B : Optical follow-up at Lulin
  76. GRB 051016B: Refined analysis of the Swift-BAT burst
  77. GRB 051016B: Swift detection of a soft burst
  78. GRB 051016: Swift-BAT refined analysis
  79. GRB051016 XMM-Newton observation
  80. GRB051016: Swift XRT refined analysis.
  81. GRB 051016: PROMPT Observations
  82. GRB051016: Swift detection of a burst
  83. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  84. GRB 051012: Swift-BAT detection of burst yesterday
  85. Swift-BAT Trigger 159578 is a possible burst
  86. GRB 051006: Swift/UVOT Upper Limits
  87. GRB051008: optical candidate
  88. GRB 051008 - a low redshift low-luminosity burst?
  89. GRB051011: bright nebulae near error box
  90. GRB051011: MASTER optical observation
  91. GRB051008: Final refined analysis of the Swift-BAT burst
  92. GRB051008: Radio Observation
  93. GRB 051008, optical observations
  94. GRB 051008: early Swift XRT analysis
  95. GRB 051008: Swift UVOT Candidate
  96. GRB 051006: P60 Observations
  97. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  98. GRB 051006: optical observations at Sierra Nevada
  99. GRB051006: Refined analysis of the Swift-BAT burst
  100. GRB051006: Swift detection of a burst

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