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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"

26507 results found.

  1. Swift detection of an RS CVn flare star
  2. GRB051211A: possible optical candidate
  3. GRB 051215: near-infrared observations
  4. GRB051215 - SDSS pre-burst observations
  5. GRB 051215: Swift detection of a possible burst
  6. GRB051105: optical observations
  7. GRB 051213: Swift-BAT refined analysis
  8. GRB051211B: XRT refined analysis
  9. GRB 051211B, optical observation
  10. GRB 051211A: Swift/UVOT upper limits
  11. GRB 051211B: Swift/UVOT upper limits
  12. GRB 051211A,optical observation
  13. GRB051211B: Liverpool Telescope observation
  14. GRB051211b: P60 Observations
  15. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  16. GRB 051210: Swift/UVOT upper limits
  17. GRB 051210: Magellan Imaging
  18. GRB 051211: TAROT optical limits
  19. GRB 051211B: a possible optical detection by TAROT
  20. GRB 051211:IAC80 optical observations
  21. GRB 051210: SALT detection limit
  22. GRB 051210: Swift XRT refined analysis
  23. GRB 051210: FRAM early limit
  24. GRB 051210: Swift-BAT refined analysis of a short burst
  25. GRB051210: Swift UVOT Observation
  26. GRB 051210: Swift detection of a burst
  27. An extraordinary long burst on December 3 from SGR1806-20
  28. Possible resuming of the SGR 1806-20 activity
  29. GRB051117B: Swift XRT refined analysis
  30. GRB051117b: No Swift/UVOT Detection
  31. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  32. GRB 051117A: Swift/UVOT Detection of an Afterglow
  33. GRB051111: Suzaku WAM observation of the prompt emission
  34. GRB051008: Suzaku WAM observation of the prompt emission
  35. GRB 051117B: R and I observations of possible host galaxy
  36. GRB 051117A: Refined analysis of the Swift-BAT burst
  37. GRB 051117B: Refined analysis of the Swift-BAT burst
  38. GRB 051117B,optical observation
  39. GRB 051117B: Lulin R and I band observation
  40. GRB051114: results of the Swift-XRT observation
  41. GRB 051109B : Nainital upper limits
  42. GRB 051114: Radio Observations
  43. GRB 051114: Swift-BAT refined analysis
  44. GRB050925: analysis of the XMM-Newton observation
  45. GRB 051114: Swift-BAT detection of a short burst
  46. GRB 051111: Further spectroscopic analysis
  47. GRB 051111: Radio afterglow
  48. GRB 051113: Swift-BAT refined analysis
  49. GRB051103: Radio Observations
  50. GRB/SGR 050925: XMM-Newton ToO observation
  51. GRB051111: Swift/UVOT Observations
  52. GRB051111: XRT preliminary analysis
  53. GRB 051111: Swift-BAT refined analysis
  54. GRB 051109A Optical Observations
  55. GRB 051111A : Lulin BVRI multi band afterglow observation
  56. GRB051111a: SARA Observations
  57. GRB 051111a: IR photometry
  58. GRB 051109B. Radio Observations
  59. GRB 051109A
  60. GRB051109A - radio observations
  61. GRB 051109B: Swift-BAT refined analysis
  62. GRB 051109A: Swift-UVOT Observations
  63. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  64. GRB051109B: no UVOT source detected
  65. GRB051109B: XRT refined analysis
  66. GRB 051109B : Lulin Optical Observations
  67. GRB 051109A : Lulin BVRI Optical afterglow observation
  68. GRB051109A: further steepening in the X-ray light curve
  69. GRB051109A: XRT refined analysis
  70. GRB 051109B: Super-LOTIS Observations
  71. GRB051105B: REM Optical observation
  72. GRB 051109B: Swift detection of a burst
  73. GRB 051109: Rc and Ic observations
  74. GRB 051109: Swift-BAT refined analysis
  75. GRB 051109a: IR Photometry and Astrometry
  76. GRB051109: Swift detection of a burst
  77. GRB 051109a: IR Detections
  78. GRB051105B: Swift/XRT upper limit
  79. GRB051105B: Swift/UVOT upper limit
  80. GRB051103: MASTER: OT limit and host galaxy candidates
  81. GRB051028: Swift-XRT refined analysis
  82. GRB 051105a, observation from Naini Tal and OSN
  83. GRB 051105a: MDM Observations
  84. GRB 051105A: TNG optical observations
  85. GRB051105A: Swift/UVOT Observations
  86. GRB 051105A, radio observations
  87. GRB051103:_MASTER_optical_observations
  88. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  89. GRB 051105A, optical observations
  90. XRT observations of GRB 051105A
  91. GRB 051105b: ART optical limits
  92. GRB 051105B (INTEGRAL 2701): Optical observation
  93. GRB 051105: Swift detection of a short burst
  94. Recent GRB UBVRcIc field photometry
  95. GRB051028 SARA Observation
  96. GRB051028: optical observations
  97. GRB051028: Swift/UVOT upper limits
  98. GRB051028: Swift XRT Position
  99. GRB051028:MASTER observations
  100. GRB051021B: Swift/UVOT Upper limits

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