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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"

26356 results found.

  1. GRB051111: XRT preliminary analysis
  2. GRB 051111: Swift-BAT refined analysis
  3. GRB 051109A Optical Observations
  4. GRB 051111A : Lulin BVRI multi band afterglow observation
  5. GRB051111a: SARA Observations
  6. GRB 051111a: IR photometry
  7. GRB 051109B. Radio Observations
  8. GRB 051109A
  9. GRB051109A - radio observations
  10. GRB 051109B: Swift-BAT refined analysis
  11. GRB 051109A: Swift-UVOT Observations
  12. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  13. GRB051109B: no UVOT source detected
  14. GRB051109B: XRT refined analysis
  15. GRB 051109B : Lulin Optical Observations
  16. GRB 051109A : Lulin BVRI Optical afterglow observation
  17. GRB051109A: further steepening in the X-ray light curve
  18. GRB051109A: XRT refined analysis
  19. GRB 051109B: Super-LOTIS Observations
  20. GRB051105B: REM Optical observation
  21. GRB 051109B: Swift detection of a burst
  22. GRB 051109: Rc and Ic observations
  23. GRB 051109: Swift-BAT refined analysis
  24. GRB 051109a: IR Photometry and Astrometry
  25. GRB051109: Swift detection of a burst
  26. GRB 051109a: IR Detections
  27. GRB051105B: Swift/XRT upper limit
  28. GRB051105B: Swift/UVOT upper limit
  29. GRB051103: MASTER: OT limit and host galaxy candidates
  30. GRB051028: Swift-XRT refined analysis
  31. GRB 051105a, observation from Naini Tal and OSN
  32. GRB 051105a: MDM Observations
  33. GRB 051105A: TNG optical observations
  34. GRB051105A: Swift/UVOT Observations
  35. GRB 051105A, radio observations
  36. GRB051103:_MASTER_optical_observations
  37. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  38. GRB 051105A, optical observations
  39. XRT observations of GRB 051105A
  40. GRB 051105b: ART optical limits
  41. GRB 051105B (INTEGRAL 2701): Optical observation
  42. GRB 051105: Swift detection of a short burst
  43. Recent GRB UBVRcIc field photometry
  44. GRB051028 SARA Observation
  45. GRB051028: optical observations
  46. GRB051028: Swift/UVOT upper limits
  47. GRB051028: Swift XRT Position
  48. GRB051028:MASTER observations
  49. GRB051021B: Swift/UVOT Upper limits
  50. GRB 051021, Optical Observations
  51. GRB 051022: XRT Refined Spectral and Temporal Analysis
  52. GRB051012: Swift-XRT analysis
  53. GRB051021B: Swift XRT refined analysis
  54. GRB 051022, mm counterpart
  55. GRB 051022: Swift/UVOT Upper Limits
  56. GRB051022: Radio Counterpart
  57. GRB051022: IR observations
  58. GRB051021A: Swift XRT refined analysis
  59. GRB051022: Optical Observations
  60. GRB051021b: Magellan IR Imaging
  61. GRB 051021, SMARTS optical/IR observations
  62. GRB051022: Swift XRT Position
  63. GRB 051021: P200 Ks Observations
  64. GRB 051022 (=H3950): SXC Flight Localization is Valid
  65. GRB051021: Swift/UVOT Upper Limits
  66. GRB 051021B: Refined analysis of the Swift-BAT burst
  67. GRB 051022: SSO40 Optical Observations
  68. GRB051022,optical observation
  69. GRB 051021,optical observation
  70. GRB 051021B: Swift detection of a burst
  71. GRB 051021 : optical afterglow observation at Lulin
  72. GRB 051021: Optical observations and candidate afterglow
  73. GRB051021.63
  74. GRB051021.6: MASTER optical observation
  75. GRB051021: A GRB Localized by HETE
  76. Swift-BAT triggered on a posible CR Shower or possible GRB
  77. GRB 051016b: Optical limit
  78. Afterglow candidate of GRB 051016B observed at Lulin
  79. GRB 051016A: Swift/UVOT upper limits
  80. GRB 051016B: refined analysis of the Swift/XRT data
  81. GRB 051016B: Swift/UVOT detection
  82. GRB 051016B,optical observation
  83. GRB 051016B : Optical follow-up at Lulin
  84. GRB 051016B: Refined analysis of the Swift-BAT burst
  85. GRB 051016B: Swift detection of a soft burst
  86. GRB 051016: Swift-BAT refined analysis
  87. GRB051016 XMM-Newton observation
  88. GRB051016: Swift XRT refined analysis.
  89. GRB 051016: PROMPT Observations
  90. GRB051016: Swift detection of a burst
  91. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  92. GRB 051012: Swift-BAT detection of burst yesterday
  93. Swift-BAT Trigger 159578 is a possible burst
  94. GRB 051006: Swift/UVOT Upper Limits
  95. GRB051008: optical candidate
  96. GRB 051008 - a low redshift low-luminosity burst?
  97. GRB051011: bright nebulae near error box
  98. GRB051011: MASTER optical observation
  99. GRB051008: Final refined analysis of the Swift-BAT burst
  100. GRB051008: Radio Observation

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