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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"

28045 results found.

  1. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  2. GRB051109B: no UVOT source detected
  3. GRB051109B: XRT refined analysis
  4. GRB 051109B : Lulin Optical Observations
  5. GRB 051109A : Lulin BVRI Optical afterglow observation
  6. GRB051109A: further steepening in the X-ray light curve
  7. GRB051109A: XRT refined analysis
  8. GRB 051109B: Super-LOTIS Observations
  9. GRB051105B: REM Optical observation
  10. GRB 051109B: Swift detection of a burst
  11. GRB 051109: Rc and Ic observations
  12. GRB 051109: Swift-BAT refined analysis
  13. GRB 051109a: IR Photometry and Astrometry
  14. GRB051109: Swift detection of a burst
  15. GRB 051109a: IR Detections
  16. GRB051105B: Swift/XRT upper limit
  17. GRB051105B: Swift/UVOT upper limit
  18. GRB051103: MASTER: OT limit and host galaxy candidates
  19. GRB051028: Swift-XRT refined analysis
  20. GRB 051105a, observation from Naini Tal and OSN
  21. GRB 051105a: MDM Observations
  22. GRB 051105A: TNG optical observations
  23. GRB051105A: Swift/UVOT Observations
  24. GRB 051105A, radio observations
  25. GRB051103:_MASTER_optical_observations
  26. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  27. GRB 051105A, optical observations
  28. XRT observations of GRB 051105A
  29. GRB 051105b: ART optical limits
  30. GRB 051105B (INTEGRAL 2701): Optical observation
  31. GRB 051105: Swift detection of a short burst
  32. Recent GRB UBVRcIc field photometry
  33. GRB051028 SARA Observation
  34. GRB051028: optical observations
  35. GRB051028: Swift/UVOT upper limits
  36. GRB051028: Swift XRT Position
  37. GRB051028:MASTER observations
  38. GRB051021B: Swift/UVOT Upper limits
  39. GRB 051021, Optical Observations
  40. GRB 051022: XRT Refined Spectral and Temporal Analysis
  41. GRB051012: Swift-XRT analysis
  42. GRB051021B: Swift XRT refined analysis
  43. GRB 051022, mm counterpart
  44. GRB 051022: Swift/UVOT Upper Limits
  45. GRB051022: Radio Counterpart
  46. GRB051022: IR observations
  47. GRB051021A: Swift XRT refined analysis
  48. GRB051022: Optical Observations
  49. GRB051021b: Magellan IR Imaging
  50. GRB 051021, SMARTS optical/IR observations
  51. GRB051022: Swift XRT Position
  52. GRB 051021: P200 Ks Observations
  53. GRB 051022 (=H3950): SXC Flight Localization is Valid
  54. GRB051021: Swift/UVOT Upper Limits
  55. GRB 051021B: Refined analysis of the Swift-BAT burst
  56. GRB 051022: SSO40 Optical Observations
  57. GRB051022,optical observation
  58. GRB 051021,optical observation
  59. GRB 051021B: Swift detection of a burst
  60. GRB 051021 : optical afterglow observation at Lulin
  61. GRB 051021: Optical observations and candidate afterglow
  62. GRB051021.63
  63. GRB051021.6: MASTER optical observation
  64. GRB051021: A GRB Localized by HETE
  65. Swift-BAT triggered on a posible CR Shower or possible GRB
  66. GRB 051016b: Optical limit
  67. Afterglow candidate of GRB 051016B observed at Lulin
  68. GRB 051016A: Swift/UVOT upper limits
  69. GRB 051016B: refined analysis of the Swift/XRT data
  70. GRB 051016B: Swift/UVOT detection
  71. GRB 051016B,optical observation
  72. GRB 051016B : Optical follow-up at Lulin
  73. GRB 051016B: Refined analysis of the Swift-BAT burst
  74. GRB 051016B: Swift detection of a soft burst
  75. GRB 051016: Swift-BAT refined analysis
  76. GRB051016 XMM-Newton observation
  77. GRB051016: Swift XRT refined analysis.
  78. GRB 051016: PROMPT Observations
  79. GRB051016: Swift detection of a burst
  80. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  81. GRB 051012: Swift-BAT detection of burst yesterday
  82. Swift-BAT Trigger 159578 is a possible burst
  83. GRB 051006: Swift/UVOT Upper Limits
  84. GRB051008: optical candidate
  85. GRB 051008 - a low redshift low-luminosity burst?
  86. GRB051011: bright nebulae near error box
  87. GRB051011: MASTER optical observation
  88. GRB051008: Final refined analysis of the Swift-BAT burst
  89. GRB051008: Radio Observation
  90. GRB 051008, optical observations
  91. GRB 051008: early Swift XRT analysis
  92. GRB 051008: Swift UVOT Candidate
  93. GRB 051006: P60 Observations
  94. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  95. GRB 051006: optical observations at Sierra Nevada
  96. GRB051006: Refined analysis of the Swift-BAT burst
  97. GRB051006: Swift detection of a burst
  98. GRB 050906, summary of radio observations
  99. GRB051001: Swift UVOT Upper Limits
  100. GRB 050925: Second Epoch WSRT Radio Observations

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