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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"

28123 results found.

  1. GRB 100802A: Enhanced Swift-XRT position
  2. GRB 100802A: Liverpool Telescope observations
  3. GRB 100802A: ROTSE-III Optical Limits
  4. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  5. GRB 100802A: Swift detection of a burst
  6. GRB 100725B: TELMA optical observation
  7. GRB 100728B - NOT optical observation
  8. GRB 100728B: Swift/UVOT Observations
  9. GRB 100728B: Lick Observations
  10. GRB 100728B: Continued KAIT observations
  11. GRB 100728B: Swift-XRT Refined Analysis
  12. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  13. GRB 100727A: Swift/UVOT Upper Limits
  14. GRB 100728A, Swift-BAT refined analysis
  15. GRB 100728B: Enhanced Swift-XRT position
  16. GRB 100728A: Swift/UVOT Upper Limits
  17. GRB 100728A: Swift-XRT refined analysis
  18. GRB 100728B: GROND Detection of the NIR Afterglow
  19. GRB 100728B: optical detection
  20. GRB 100728B: KAIT optical afterglow detection (correction)
  21. GRB 100728B: Swift detection of a burst with an optical counterpart
  22. GRB 100728A: Skynet/PROMPT Detections
  23. GRB 100728A: KAIT optical afterglow detection
  24. GRB 100728A: Enhanced Swift-XRT position
  25. GRB 100728A: Swift detection of a burst
  26. GRB 100727A: Swift XRT refined analysis
  27. GRB 100727A: Enhanced Swift-XRT position
  28. GRB100727A: MOA optical upper limit
  29. GRB 100727A: Swift detection of a burst
  30. GRB100725B: MITSuME optical upper limits
  31. GRB 100724B: gamma-ray detection by AGILE
  32. GRB 100725B: refined XRT analysis
  33. GRB 100725A: GROND upper limits
  34. GRB 100725B: Swift/UVOT Upper Limits
  35. GRB 100725A: Swift/UVOT Upper Limits
  36. GRB 100725A: Swift XRT refined analysis
  37. GRB 100725B: Enhanced Swift-XRT position
  38. GRB 100725A: Enhanced Swift-XRT position
  39. GRB100725B: Faulkes Telescope North observations
  40. GRB 100725B: Swift detection of a burst
  41. GRB100725A Faulkes Telescope South observations
  42. GRB 100725A: Prompt enhanced Swift-XRT position
  43. GRB 100725A: Swift detection of a burst
  44. GRB 100724B: Fermi GBM detection
  45. GRB 100724A: Swift XRT refined analysis
  46. GRB 100724A: Enhanced Swift-XRT position
  47. GRB 100724A: X-shooter redshift
  48. GRB 100724A: fading afterglow seen with GROND
  49. GRB 100724A, GROND detection of an afterglow candidate
  50. GRB 100724A: Swift detection of a burst
  51. GRB 100614A: 10.4-m GTC deep-optical limit
  52. GRB 100722A: Fermi GBM detection
  53. GRB 100719A: Swift detection of a burst
  54. GRB 100713A: optical observation in Maidanak
  55. GRB 100713A: further inspection of TNG images
  56. GRB 100713A: Swift XRT refined analysis
  57. GRB 100713A : IRSF/SIRIUS NIR upper limits
  58. GRB100713A: Swift/UVOT observations
  59. GRB 100713A: GROND upper limits
  60. GRB 100713A: optical upper limit
  61. GRB 100713A: TNG optical observations
  62. GRB 100713A: TELMA and 1.5m OSN optical observations
  63. GRB100713A: Swift X-ray afterglow detection
  64. GRB 100707A: Suzaku WAM observation of the prompt emission
  65. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  66. GRB 100707A: Fermi LAT detection
  67. GRB 100707A: Fermi GBM detection
  68. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  69. GRB 100628A: Chandra observations
  70. GRB 100628A: Swift XRT/UVOT refined analysis
  71. Tentative redshift of GRB100704A from Swift-XRT data
  72. GRB 100703A: a short GRB detected by INTEGRAL
  73. GRB 100704A: Swift XRT refined analysis
  74. GRB 100704: Swift/UVOT Upper Limits
  75. GRB100704A: MOA optical upper limit
  76. GRB 100704A: Enhanced Swift-XRT position
  77. GRB 100704A: Swift detection of a burst
  78. GRB 100615A: Additional Gemini/NIRI observations
  79. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  80. GRB 100702A: Swift XRT refined analysis
  81. Swift/UVOT observations of GRB100702A
  82. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  83. GRB 100701B: Fermi GBM detection
  84. GRB 100702A: Magellan near-IR observations
  85. GRB 100702A: VLT optical observations
  86. GRB 100702: ROTSE-III Optical Limits
  87. GRB 100702A: Swift detection of a short burst
  88. GRB 100615A: Chandra X-ray ToO Observation
  89. XRF 100701A : MAXI/GSC detection of a probable XRF
  90. GRB 100213B: Detection of Fading Optical Afterglow
  91. GRB 100625A: Fermi GBM detection
  92. GRB 100628A: Second epoch of Magellan near-IR observations
  93. GRB 100628A: GROND optical/NIR observations of the host candidate
  94. GRB 100628A: Gemini North Observations
  95. GRB 100628A: Coincidence of source "G1" with revised XRT error circle
  96. GRB 100628A: Swift XRT refined position
  97. GRB100625A: GROND confirmation of constant source
  98. GRB 100625A Gemini-South 2nd epoch imaging
  99. GRB100628A : MOA optical upper limit
  100. GRB 090709A: Host galaxy detection

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