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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"

28051 results found.

  1. GRB 051111a: IR photometry
  2. GRB 051109B. Radio Observations
  3. GRB 051109A
  4. GRB051109A - radio observations
  5. GRB 051109B: Swift-BAT refined analysis
  6. GRB 051109A: Swift-UVOT Observations
  7. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  8. GRB051109B: no UVOT source detected
  9. GRB051109B: XRT refined analysis
  10. GRB 051109B : Lulin Optical Observations
  11. GRB 051109A : Lulin BVRI Optical afterglow observation
  12. GRB051109A: further steepening in the X-ray light curve
  13. GRB051109A: XRT refined analysis
  14. GRB 051109B: Super-LOTIS Observations
  15. GRB051105B: REM Optical observation
  16. GRB 051109B: Swift detection of a burst
  17. GRB 051109: Rc and Ic observations
  18. GRB 051109: Swift-BAT refined analysis
  19. GRB 051109a: IR Photometry and Astrometry
  20. GRB051109: Swift detection of a burst
  21. GRB 051109a: IR Detections
  22. GRB051105B: Swift/XRT upper limit
  23. GRB051105B: Swift/UVOT upper limit
  24. GRB051103: MASTER: OT limit and host galaxy candidates
  25. GRB051028: Swift-XRT refined analysis
  26. GRB 051105a, observation from Naini Tal and OSN
  27. GRB 051105a: MDM Observations
  28. GRB 051105A: TNG optical observations
  29. GRB051105A: Swift/UVOT Observations
  30. GRB 051105A, radio observations
  31. GRB051103:_MASTER_optical_observations
  32. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  33. GRB 051105A, optical observations
  34. XRT observations of GRB 051105A
  35. GRB 051105b: ART optical limits
  36. GRB 051105B (INTEGRAL 2701): Optical observation
  37. GRB 051105: Swift detection of a short burst
  38. Recent GRB UBVRcIc field photometry
  39. GRB051028 SARA Observation
  40. GRB051028: optical observations
  41. GRB051028: Swift/UVOT upper limits
  42. GRB051028: Swift XRT Position
  43. GRB051028:MASTER observations
  44. GRB051021B: Swift/UVOT Upper limits
  45. GRB 051021, Optical Observations
  46. GRB 051022: XRT Refined Spectral and Temporal Analysis
  47. GRB051012: Swift-XRT analysis
  48. GRB051021B: Swift XRT refined analysis
  49. GRB 051022, mm counterpart
  50. GRB 051022: Swift/UVOT Upper Limits
  51. GRB051022: Radio Counterpart
  52. GRB051022: IR observations
  53. GRB051021A: Swift XRT refined analysis
  54. GRB051022: Optical Observations
  55. GRB051021b: Magellan IR Imaging
  56. GRB 051021, SMARTS optical/IR observations
  57. GRB051022: Swift XRT Position
  58. GRB 051021: P200 Ks Observations
  59. GRB 051022 (=H3950): SXC Flight Localization is Valid
  60. GRB051021: Swift/UVOT Upper Limits
  61. GRB 051021B: Refined analysis of the Swift-BAT burst
  62. GRB 051022: SSO40 Optical Observations
  63. GRB051022,optical observation
  64. GRB 051021,optical observation
  65. GRB 051021B: Swift detection of a burst
  66. GRB 051021 : optical afterglow observation at Lulin
  67. GRB 051021: Optical observations and candidate afterglow
  68. GRB051021.63
  69. GRB051021.6: MASTER optical observation
  70. GRB051021: A GRB Localized by HETE
  71. Swift-BAT triggered on a posible CR Shower or possible GRB
  72. GRB 051016b: Optical limit
  73. Afterglow candidate of GRB 051016B observed at Lulin
  74. GRB 051016A: Swift/UVOT upper limits
  75. GRB 051016B: refined analysis of the Swift/XRT data
  76. GRB 051016B: Swift/UVOT detection
  77. GRB 051016B,optical observation
  78. GRB 051016B : Optical follow-up at Lulin
  79. GRB 051016B: Refined analysis of the Swift-BAT burst
  80. GRB 051016B: Swift detection of a soft burst
  81. GRB 051016: Swift-BAT refined analysis
  82. GRB051016 XMM-Newton observation
  83. GRB051016: Swift XRT refined analysis.
  84. GRB 051016: PROMPT Observations
  85. GRB051016: Swift detection of a burst
  86. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  87. GRB 051012: Swift-BAT detection of burst yesterday
  88. Swift-BAT Trigger 159578 is a possible burst
  89. GRB 051006: Swift/UVOT Upper Limits
  90. GRB051008: optical candidate
  91. GRB 051008 - a low redshift low-luminosity burst?
  92. GRB051011: bright nebulae near error box
  93. GRB051011: MASTER optical observation
  94. GRB051008: Final refined analysis of the Swift-BAT burst
  95. GRB051008: Radio Observation
  96. GRB 051008, optical observations
  97. GRB 051008: early Swift XRT analysis
  98. GRB 051008: Swift UVOT Candidate
  99. GRB 051006: P60 Observations
  100. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event

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