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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"

45687 results found.

  1. GRB 100727A: Swift XRT refined analysis
  2. GRB 100727A: Fermi GBM observation
  3. GRB 100727A, Swift-BAT refined analysis
  4. GRB 100727A: Enhanced Swift-XRT position
  5. GRB100727A: MOA optical upper limit
  6. GRB 100727A: Swift detection of a burst
  7. GRB100725B: MITSuME optical upper limits
  8. GRB 100724B: AGILE/GRID analysis
  9. GRB 100724B: Suzaku WAM observation of the prompt emission
  10. GRB 100724B: gamma-ray detection by AGILE
  11. GRB 100725B: Swift-BAT refined analysis
  12. GRB 100725B: refined XRT analysis
  13. GRB 100725A: GROND upper limits
  14. GRB 100725B: Swift/UVOT Upper Limits
  15. GRB 100725A: Swift/UVOT Upper Limits
  16. GRB 100725A: Swift-BAT refined analysis
  17. GRB 100725A: Swift XRT refined analysis
  18. GRB 100725B: Enhanced Swift-XRT position
  19. GRB 100725A: Enhanced Swift-XRT position
  20. GRB100725B: Faulkes Telescope North observations
  21. GRB 100725B: Swift detection of a burst
  22. GRB100725A Faulkes Telescope South observations
  23. Konus-Wind observation of GRB 100724B
  24. GRB 100725A: Prompt enhanced Swift-XRT position
  25. GRB 100725A: Swift detection of a burst
  26. GRB 100724B: Fermi LAT and GBM analysis
  27. GRB 100724B: Fermi GBM detection
  28. GRB 100724A: Swift/BAT spectral lag results
  29. GRB 100724A: Swift XRT refined analysis
  30. GRB 100724A: Enhanced Swift-XRT position
  31. GRB 100724A: Swift/UVOT observations
  32. GRB 100724A: Swift-BAT refined analysis
  33. GRB 100724A: X-shooter redshift
  34. GRB 100724A: fading afterglow seen with GROND
  35. GRB 100724A, GROND detection of an afterglow candidate
  36. GRB 100724A: Swift detection of a burst
  37. GRB 100614A: 10.4-m GTC deep-optical limit
  38. GRB 100722A: Fermi GBM detection
  39. GRB 100718A: MASTER-Net optical prompt and alert observations
  40. GRB 100719A: Swift-BAT refined analysis
  41. GRB 100719A: Swift detection of a burst
  42. GRB 100713A: optical observation in Maidanak
  43. GRB 100713A: further inspection of TNG images
  44. GRB 100713A: Swift XRT refined analysis
  45. GRB 100713A : IRSF/SIRIUS NIR upper limits
  46. Fermi GBM trigger 300794561 (100714419) is not a GRB
  47. GRB100713A: Swift/UVOT observations
  48. GRB 100713A: GROND upper limits
  49. GRB 100713A: optical upper limit
  50. GRB 100713A: TNG optical observations
  51. GRB 100713A: TELMA and 1.5m OSN optical observations
  52. GRB100713A: Swift X-ray afterglow detection
  53. GRB 100713A: a long GRB detected by INTEGRAL
  54. GRB 100707A: Suzaku WAM observation of the prompt emission
  55. Fermi GBM trigger 300370702 (100709513) is not a GRB
  56. Konus-Wind observation of GRB 100707A
  57. IPN triangulation of GRB 100707A
  58. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  59. GRB 100707A: Fermi LAT detection
  60. GRB 100707A: Fermi GBM detection
  61. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  62. GRB 100628A: Chandra observations
  63. GRB 100628A: Swift XRT/UVOT refined analysis
  64. Tentative redshift of GRB100704A from Swift-XRT data
  65. Konus-Wind observation of GRB 100701B
  66. IPN triangulation of GRB 100701B
  67. Konus-Wind observation of GRB 100704A
  68. GRB 100703A: a short GRB detected by INTEGRAL
  69. GRB 100704A: Swift XRT refined analysis
  70. GRB 100704: Swift/UVOT Upper Limits
  71. GRB 100704A: Fermi GBM observation
  72. GRB 100704A: Swift-BAT refined analysis
  73. GRB100704A: MOA optical upper limit
  74. GRB 100704A: Enhanced Swift-XRT position
  75. GRB 100704A: Swift detection of a burst
  76. GRB 100615A: Additional Gemini/NIRI observations
  77. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  78. GRB 100702A, Swift-BAT refined analysis
  79. Fermi GBM trigger 299767472 (100702531) is not a GRB
  80. GRB 100702A: Swift XRT refined analysis
  81. Swift/UVOT observations of GRB100702A - correction
  82. Swift/UVOT observations of GRB100702A
  83. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  84. GRB 100701B: Fermi GBM detection
  85. GRB 100702A: Magellan near-IR observations
  86. GRB 100702A: VLT optical observations
  87. GRB 100702: ROTSE-III Optical Limits
  88. GRB 100702A: Swift detection of a short burst
  89. GRB 100615A: Chandra X-ray ToO Observation
  90. XRF 100701A : MAXI/GSC detection of a probable XRF
  91. GRB 100213B: Detection of Fading Optical Afterglow
  92. GRB 100625A: Fermi GBM detection
  93. GRB 100628A: Second epoch of Magellan near-IR observations
  94. GRB 100628A: GROND optical/NIR observations of the host candidate
  95. GRB 100628A: Gemini North Observations
  96. GRB 100628A: Coincidence of source "G1" with revised XRT error circle
  97. GRB 100628A: Swift XRT refined position
  98. GRB100625A: GROND confirmation of constant source
  99. GRB 100625A Gemini-South 2nd epoch imaging
  100. GRB100628A : MOA optical upper limit

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