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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"

19549 results found.

  1. GRB 060111B: MITSuME detection of optical afterglow
  2. GRB 060111B: TAROT optical observation
  3. GRB060111A: RTT150 optical observations
  4. GRB060111B: RTT150, possible host galaxy
  5. GRB 060111(a): P60 Observations
  6. GRB 060111B: Gualba observatory limit
  7. GRB 060111B: Swift detection of a burst
  8. GRB 060111: Swift-BAT Refined Analysis
  9. GRB 060108: VLT K-band observations
  10. GRB 060111: TAROT optical observation
  11. GRB 060111: possible UVOT counterpart
  12. GRB 060111: Swift detection of a burst
  13. GRB 060110: Mitsume optical observations
  14. GRB 060108: z-band imaging from Gemini-North
  15. GRB 060110a: RAPTOR detection of early optical emission.
  16. GRB 060110: UKIRT K-band observations
  17. GRB 060110: IR Candidate Afterglow
  18. GRB060110, optical observation
  19. GRB 060110: Correction
  20. GRB 050110: IR Observations
  21. GRB 060109: Swift/UVOT upper limits
  22. GRB060109, optical observation
  23. GRB 060108: ISAS early observations and near IR upper limit
  24. GRB060108: P200 Ks Observations
  25. GRB 060108: early UKIRT K-band observations
  26. GRB 060109: Swift Detection of a long burst
  27. GRB 060108: VLT J-band observations
  28. GRB 060108: Mitsume optical observations
  29. GRB 060108: Swift/UVOT upper limits
  30. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  31. GRB060108: SDSS pre-burst observations
  32. GRB060108: Faulkes Telescope observation
  33. GRB060108, optical observation
  34. GRB060108: Swift detection of its 100th GRB
  35. GRB 060105: ISAS observations and near IR upper limit
  36. GRB 060105: Swift/UVOT upper limits
  37. GRB 060105: Mitsume optical observations
  38. GRB060105: Suzaku-XIS and -HXD observation plan
  39. GRB060105, optical observation
  40. GRB060105: Swift detection of a bright long burst
  41. Swift-BAT trigger 175653 is probably not a GRB
  42. GRB 051221B: Optical Observations with Kuiper 1.54m
  43. GRB 051227: optical observation
  44. GRB 051227: optical afterglow
  45. GRB 051227: Magellan r'-band Imaging/Astrometry
  46. GRB 051227: refined analysis of VLT images
  47. GRB 051227: P60 Observations
  48. GRB 051227: MDM Observation
  49. GRB 051227: R-band object in the XRT error circle
  50. GRB 051227: Refined analysis of the Swift-BAT burst
  51. GRB051227: SDSS pre-burst observations
  52. GRB 051227, optical observation
  53. GRB 051227: Swift detection of a burst
  54. GRB051117B: optical observation
  55. GRB 051221A: MDM Optical Observations
  56. GRB051016: analysis of the XMM-Newton observation
  57. GRB 051221B: TAROT optical limits
  58. Swift-BAT detection of a possible burst
  59. GRB 051221: Swift/UVOT upper limits
  60. GRB 051221: Improved astrometry of the IR counterpart
  61. GRB 051221: Swift detection of a bright short burst
  62. Swift detection of an RS CVn flare star
  63. GRB051211A: possible optical candidate
  64. GRB 051215: near-infrared observations
  65. GRB051215 - SDSS pre-burst observations
  66. GRB 051215: Swift detection of a possible burst
  67. GRB 051211B, optical observation
  68. GRB 051211A: Swift/UVOT upper limits
  69. GRB 051211B: Swift/UVOT upper limits
  70. GRB 051211A,optical observation
  71. GRB 051211B: Swift XRT confirmation of the afterglow
  72. GRB051211B: Liverpool Telescope observation
  73. GRB051211b: P60 Observations
  74. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  75. GRB 051210: Swift/UVOT upper limits
  76. GRB 051210: Magellan Imaging
  77. GRB 051211: TAROT optical limits
  78. GRB 051211B: a possible optical detection by TAROT
  79. GRB 051211B: a long GRB detected by INTEGRAL
  80. GRB 051211:IAC80 optical observations
  81. GRB 051210: SALT detection limit
  82. GRB 051210: FRAM early limit
  83. GRB 051210: Swift-BAT refined analysis of a short burst
  84. GRB051210: Swift UVOT Observation
  85. GRB 051210: A short GRB in a cluster?
  86. GRB 051210: Swift detection of a burst
  87. An extraordinary long burst on December 3 from SGR1806-20
  88. GRB051117b: No Swift/UVOT Detection
  89. GRB 051117A: Swift/UVOT Detection of an Afterglow
  90. GRB 051117B: R and I observations of possible host galaxy
  91. GRB 051117B: Refined analysis of the Swift-BAT burst
  92. GRB 051117B,optical observation
  93. GRB 051117: Swift detection of a bright burst
  94. GRB051114: results of the Swift-XRT observation
  95. GRB 051109B : Nainital upper limits
  96. GRB 051114: Radio Observations
  97. GRB050925: analysis of the XMM-Newton observation
  98. GRB 051111: Radio afterglow
  99. GRB051103: Radio Observations
  100. GRB 051109A Milagro GeV/TeV Observations

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