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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32735 results found.

  1. GRB 051227: Gemini observations
  2. GRB 051227: Keck Spectroscopy
  3. GRB 051227: Magellan r'-band Imaging/Astrometry
  4. GRB 051227: refined analysis of VLT images
  5. GRB 051227: P60 Observations
  6. GRB 051227: MDM Observation
  7. GRB 051227: R-band object in the XRT error circle
  8. GRB 051227: Joint Swift-HETE Spectral Analysis
  9. GRB 051227: XRT refined analysis
  10. GRB 051227: Refined analysis of the Swift-BAT burst
  11. GRB 051227, optical observation
  12. GRB051117B: optical observation
  13. Konus-Wind observation of GRB 051221A
  14. GRB 051221A: MDM Optical Observations
  15. GRB 051221A: Detection at 251nm with Swift UVOT
  16. GRB 051221A: Chandra Afterglow Position
  17. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  18. GRB 051221B: ROTSE-III Optical Limits
  19. GRB 051221B: TAROT optical limits
  20. GRB 051221A: WSRT Radio Observations
  21. GRB 051221: Redshift from Gemini
  22. GRB 051221: Continued fading of optical afterglow
  23. GRB 051221B: Refined analysis of the Swift-BAT burst
  24. Possible GRB 051221B: MDM Optical Detection
  25. GRB 051221A: RAPTOR Fading Counterpart Constraint
  26. Possible GRB 051221B: Swift XRT position
  27. GRB 051221: Discovery of fading optical afterglow
  28. GRB 051221: Swift XRT refined analysis
  29. GRB 051221: Swift/UVOT upper limits
  30. GRB 051221: Possible nearby cluster
  31. GRB 051221: Correction to GCN #4368
  32. GRB 051221: Gemini observations
  33. GRB 051221: Improved astrometry of the IR counterpart
  34. GRB051221: K-band source
  35. GRB 051221: XRT position
  36. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  37. GRB 051221: IR Observations at GRB+1hr
  38. Refined analysis of the SWIFT J1626.6-5156
  39. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  40. GRB051211A (=H3979): Refined Analysis
  41. GRB 051211B: optical afterglow
  42. GRB051211A: possible optical candidate
  43. Swift Trigger 172767 is not a GRB
  44. GRB 051215: near-infrared observations
  45. GRB051215 - SDSS pre-burst observations
  46. GRB 051215: A short GRB in a cluster?
  47. GRB051211B: Probable radio afterglow
  48. GRB051105: optical observations
  49. GRB 051213: Swift-BAT refined analysis
  50. GRB051211B: XRT refined analysis
  51. GRB051211B, RBO optical observations
  52. GRB 051211A: Swift/UVOT upper limits
  53. GRB 051211B: Swift/UVOT upper limits - correction
  54. GRB 051211B: Swift/UVOT upper limits
  55. GRB 051211A,optical observation
  56. GRB 051211B: Swift XRT confirmation of the afterglow
  57. GRB051211B: Liverpool Telescope observation
  58. GRB 051211b: RTT150 optical observations
  59. GRB051211b: P60 Observations
  60. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  61. GRB 051211B: Swift XRT Observations
  62. GRB 051210: Swift/UVOT upper limits
  63. GRB 051210: Magellan Imaging
  64. GRB 051211: TAROT optical limits
  65. GRB 051211B: a possible optical detection by TAROT
  66. GRB 051211: Swift XRT upper limit
  67. HETE SXC localization of GRB 051211 (=H3979)
  68. GRB 051210: SALT detection limit
  69. GRB 051210: Swift XRT refined analysis
  70. GRB 051210: FRAM early limit
  71. GRB 051210: Swift-BAT refined analysis of a short burst
  72. GRB051210: Swift UVOT Observation
  73. GRB 051210: A short GRB in a cluster?
  74. IPN observations of SGR1806-20
  75. Swift XRT positions
  76. An extraordinary long burst on December 3 from SGR1806-20
  77. GRB051117B: optical observation
  78. GRB051111: optical observaion
  79. Swift-BAT trigger 165579 is not a GRB
  80. GRB051117b: No Swift/UVOT Detection
  81. GRB051111: Rc optical observations: correction
  82. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  83. GRB 051117A: Swift/UVOT Detection of an Afterglow
  84. GRB051111: Rc optical observations
  85. GRB051008: Suzaku WAM observation of the prompt emission
  86. GRB 051109B: GAO 150cm telescope Optical limit
  87. GRB 051109A : GAO 150cm telescope Rc-band detection
  88. GRB 051021 Optical Observations
  89. GRB 051117B: MARGE Optical Limits
  90. GRB 051117A and B: Radio Observations
  91. GRB 051117B: R and I observations of possible host galaxy
  92. GRB 051117b: NIR observations
  93. GRB 051117A: Refined analysis of the Swift-BAT burst
  94. GRB 051117B: Refined analysis of the Swift-BAT burst
  95. GRB051117A : XRT refined analysis
  96. GRB 051117B: Lulin R and I band observation
  97. GRB 051117B: Optical observations
  98. GRB 051117B: ROTSE-III Optical Limits
  99. GRB051114: results of the Swift-XRT observation
  100. GRB 051028 Optical Observations

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