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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"

23690 results found.

  1. GRB 060111A: refined UVOT anaysis
  2. GRB 060111B: TAROT optical observation
  3. GRB060111A: RTT150 optical observations
  4. GRB060111B: RTT150, possible host galaxy
  5. GRB 060111B: Refined analysis of the Swift-BAT burst
  6. GRB 060110: MARGE observations
  7. GRB 060111(a): P60 Observations
  8. GRB 060111B: Swift detection of a burst
  9. GRB060111.2:_MASTER optical limit
  10. GRB 060111: TAROT optical observation
  11. GRB060111 : XRT refined analysis
  12. GRB 060111: Swift detection of a burst
  13. GRB 060110: Swift-BAT refined analysis
  14. GRB 060109: Swift-BAT refined analysis
  15. Correction to GRB 060109 XRT analysis
  16. GRB 060110: Optical limit
  17. GRB 060109: Refined Swift-XRT analysis
  18. GRB 060109: Swift/UVOT upper limits
  19. GRB060109, optical observation
  20. Swift UVOT correction to GCN 4455
  21. GRB 060109: Swift Detection of a long burst
  22. GRB060108: SDSS pre-burst observations
  23. GRB060108: Faulkes Telescope observation
  24. GRB060108: Swift detection of its 100th GRB
  25. GRB 060105: MDM Observation
  26. Konus-Wind observation of GRB 060105
  27. GRB 060105: Swift/UVOT upper limits
  28. GRB060105 : Kiso optical observation
  29. Swift-BAT trigger 175653 is not an astrophysical source
  30. Swift-BAT trigger 175653 is probably not a GRB
  31. GRB 060102: Swift-BAT refined analysis
  32. Time Correction to GRB 060102
  33. GRB 060102: Swift-BAT detection of a burst
  34. GRB051211B: optical observations
  35. GRB 051227: Likely host galaxy underlying afterglow position
  36. GRB 051227: Confirmed fading from Gemini observations
  37. GRB 051227: optical afterglow
  38. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  39. GRB 051227: P60 Observations
  40. GRB 051227: R-band object in the XRT error circle
  41. GRB 051227: Joint Swift-HETE Spectral Analysis
  42. GRB 051227: XRT refined analysis
  43. GRB051227: SDSS pre-burst observations
  44. GRB 051227, optical observation
  45. Konus-Wind observation of GRB 051221A
  46. GRB051221A: Suzaku WAM observation of the prompt emission
  47. GRB 051221A: MDM Optical Observations
  48. GRB 051221A: Detection at 251nm with Swift UVOT
  49. GRB 051221B: TAROT optical limits
  50. GRB 051221: Redshift from Gemini
  51. GRB 051221: Continued fading of optical afterglow
  52. GRB 051221B: Refined analysis of the Swift-BAT burst
  53. GRB 051221B: BOOTES optical observations.
  54. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  55. Swift-BAT detection of a possible burst
  56. GRB 051221: Discovery of fading optical afterglow
  57. GRB 051221: Swift XRT refined analysis
  58. GRB 051221: Swift/UVOT upper limits
  59. GRB 051221: XRT position
  60. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  61. GRB 051221: Swift detection of a bright short burst
  62. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  63. GRB051211A (=H3979): Refined Analysis
  64. GRB 051211B: optical afterglow
  65. Swift detection of an RS CVn flare star
  66. GRB051211A: possible optical candidate
  67. GRB 051215: near-infrared observations
  68. GRB051215 - SDSS pre-burst observations
  69. GRB 051215: Swift detection of a possible burst
  70. GRB051105: optical observations
  71. GRB 051211a: RTT150 optical observations
  72. GRB 051211B: Swift/UVOT upper limits
  73. GRB051211B: Liverpool Telescope observation
  74. GRB 051211b: RTT150 optical observations
  75. GRB051211b: P60 Observations
  76. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  77. GRB 051210: Magellan Imaging
  78. GRB 051211: TAROT optical limits
  79. GRB 051211B: a possible optical detection by TAROT
  80. GRB 051211B: a long GRB detected by INTEGRAL
  81. GRB 051211:IAC80 optical observations
  82. HETE SXC localization of GRB 051211 (=H3979)
  83. GRB 051210: SALT detection limit
  84. GRB 051210: BAT further refined analysis of the short burst
  85. GRB 051210: Swift-BAT refined analysis of a short burst
  86. GRB 051210: A short GRB in a cluster?
  87. GRB 051210: Swift detection of a burst
  88. IPN observations of SGR1806-20
  89. GRB051117B: optical observation
  90. GRB051111: optical observaion
  91. GRB 051127: Swift-BAT detection of a possible burst
  92. GRB051117B: Swift XRT refined analysis
  93. GRB051117b: No Swift/UVOT Detection
  94. GRB051111: Suzaku WAM observation of the prompt emission
  95. GRB 051021 Optical Observations
  96. GRB 051117A: Refined analysis of the Swift-BAT burst
  97. GRB051117A : XRT refined analysis
  98. GRB 051117B: Lulin R and I band observation
  99. GRB051117B: Swift XRT position
  100. GRB 051117B: Swift detection of a burst

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