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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"

26353 results found.

  1. GRB 051111A : Lulin BVRI multi band afterglow observation
  2. GRB051111a: SARA Observations
  3. GRB 051111a: IR photometry
  4. GRB 051109B. Radio Observations
  5. GRB 051109A
  6. GRB051109A - radio observations
  7. GRB 051109B: Swift-BAT refined analysis
  8. GRB 051109A: Swift-UVOT Observations
  9. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  10. GRB051109B: no UVOT source detected
  11. GRB051109B: XRT refined analysis
  12. GRB 051109B : Lulin Optical Observations
  13. GRB 051109A : Lulin BVRI Optical afterglow observation
  14. GRB051109A: further steepening in the X-ray light curve
  15. GRB051109A: XRT refined analysis
  16. GRB 051109B: Super-LOTIS Observations
  17. GRB051105B: REM Optical observation
  18. GRB 051109B: Swift detection of a burst
  19. GRB 051109: Rc and Ic observations
  20. GRB 051109: Swift-BAT refined analysis
  21. GRB 051109a: IR Photometry and Astrometry
  22. GRB051109: Swift detection of a burst
  23. GRB 051109a: IR Detections
  24. GRB051105B: Swift/XRT upper limit
  25. GRB051105B: Swift/UVOT upper limit
  26. GRB051103: MASTER: OT limit and host galaxy candidates
  27. GRB051028: Swift-XRT refined analysis
  28. GRB 051105a, observation from Naini Tal and OSN
  29. GRB 051105a: MDM Observations
  30. GRB 051105A: TNG optical observations
  31. GRB051105A: Swift/UVOT Observations
  32. GRB 051105A, radio observations
  33. GRB051103:_MASTER_optical_observations
  34. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  35. GRB 051105A, optical observations
  36. XRT observations of GRB 051105A
  37. GRB 051105b: ART optical limits
  38. GRB 051105B (INTEGRAL 2701): Optical observation
  39. GRB 051105: Swift detection of a short burst
  40. Recent GRB UBVRcIc field photometry
  41. GRB051028 SARA Observation
  42. GRB051028: optical observations
  43. GRB051028: Swift/UVOT upper limits
  44. GRB051028: Swift XRT Position
  45. GRB051028:MASTER observations
  46. GRB051021B: Swift/UVOT Upper limits
  47. GRB 051021, Optical Observations
  48. GRB 051022: XRT Refined Spectral and Temporal Analysis
  49. GRB051012: Swift-XRT analysis
  50. GRB051021B: Swift XRT refined analysis
  51. GRB 051022, mm counterpart
  52. GRB 051022: Swift/UVOT Upper Limits
  53. GRB051022: Radio Counterpart
  54. GRB051022: IR observations
  55. GRB051021A: Swift XRT refined analysis
  56. GRB051022: Optical Observations
  57. GRB051021b: Magellan IR Imaging
  58. GRB 051021, SMARTS optical/IR observations
  59. GRB051022: Swift XRT Position
  60. GRB 051021: P200 Ks Observations
  61. GRB 051022 (=H3950): SXC Flight Localization is Valid
  62. GRB051021: Swift/UVOT Upper Limits
  63. GRB 051021B: Refined analysis of the Swift-BAT burst
  64. GRB 051022: SSO40 Optical Observations
  65. GRB051022,optical observation
  66. GRB 051021,optical observation
  67. GRB 051021B: Swift detection of a burst
  68. GRB 051021 : optical afterglow observation at Lulin
  69. GRB 051021: Optical observations and candidate afterglow
  70. GRB051021.63
  71. GRB051021.6: MASTER optical observation
  72. GRB051021: A GRB Localized by HETE
  73. Swift-BAT triggered on a posible CR Shower or possible GRB
  74. GRB 051016b: Optical limit
  75. Afterglow candidate of GRB 051016B observed at Lulin
  76. GRB 051016A: Swift/UVOT upper limits
  77. GRB 051016B: refined analysis of the Swift/XRT data
  78. GRB 051016B: Swift/UVOT detection
  79. GRB 051016B,optical observation
  80. GRB 051016B : Optical follow-up at Lulin
  81. GRB 051016B: Refined analysis of the Swift-BAT burst
  82. GRB 051016B: Swift detection of a soft burst
  83. GRB 051016: Swift-BAT refined analysis
  84. GRB051016 XMM-Newton observation
  85. GRB051016: Swift XRT refined analysis.
  86. GRB 051016: PROMPT Observations
  87. GRB051016: Swift detection of a burst
  88. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  89. GRB 051012: Swift-BAT detection of burst yesterday
  90. Swift-BAT Trigger 159578 is a possible burst
  91. GRB 051006: Swift/UVOT Upper Limits
  92. GRB051008: optical candidate
  93. GRB 051008 - a low redshift low-luminosity burst?
  94. GRB051011: bright nebulae near error box
  95. GRB051011: MASTER optical observation
  96. GRB051008: Final refined analysis of the Swift-BAT burst
  97. GRB051008: Radio Observation
  98. GRB 051008, optical observations
  99. GRB 051008: early Swift XRT analysis
  100. GRB 051008: Swift UVOT Candidate

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