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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"

12054 results found.

  1. GRB 130216A: MASTER-Net early observations
  2. GRB 130216A: MITSuME Ishigakijima upper limits
  3. GRB 130215A: MITSuME Okayama Optical Observation
  4. Swift GRB130206A: late XRT observations.
  5. GRB 130131B: CTIO 0.9-m optical upper-limits
  6. GRB 130211A: Swift/UVOT Upper Limits
  7. GRB 130211A: Swift detection of a burst
  8. GRB 130131A: MITSuME Akeno Optical upper limits
  9. GRB 130131B: MITSuME Akeno Optical upper limits
  10. GRB 130122A: PTF P48 optical upper limits
  11. GRB 130206A: GROND Observations
  12. GRB 130206A: Fermi LAT Observations
  13. GRB 130206A: XRT and UVOT follow-up observations.
  14. GRB 130131B: optical upper limit in Mondy observatory
  15. GRB 130131A: Swift/UVOT Upper Limits
  16. GRB 130131B: RATIR Upper Limits
  17. GRB 130131A: RATIR optical and infrared upper limits
  18. GRB 130131B: GROND Upper limits
  19. GRB 130131B: Swift/UVOT Upper Limits
  20. GRB 130131B: MITSuME Okayama optical upper limits
  21. GRB 130131A: MITSuME Okayama optical upper limits
  22. GRB 130131B: Swift detection of a burst
  23. GRB 130131A: Swift detection of a burst
  24. Swift Trigger 547142: MAXI/GSC upper limit
  25. GRB 130122A: Swift/UVOT Detection
  26. GRB 130122A: RATIR Detection
  27. GRB 130122A: Xinglong optical upper limit
  28. GRB 130102B: MASTER synchronous observations
  29. GRB 130102A: Swift/UVOT Upper Limits
  30. GRB 130102A: MASTER-Net optical observations
  31. GRB 130102B: MAXI/GSC detection
  32. GRB 130102A: Swift detection of a burst
  33. GRB 121229A: Swift/UVOT Upper Limits
  34. GRB 121229A: MAXI/GSC detection
  35. GRB 121229A: Swift detection of a burst
  36. GRB 121226A: Swift/UVOT Upper Limits
  37. GRB 121226A: NOT optical upper limit
  38. GRB 121226A: MITSuME Okayama Optical upper limits
  39. GRB 121226A: Swift detection of a burst
  40. GRB 121225A: MAXI/GSC detection
  41. GRB 121217A: ATCA 44GHz upper limit
  42. GRB 121217A: Swift/UVOT Detection
  43. GRB 121217A: Swift detection of a burst
  44. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  45. GRB 121209A: Swift/UVOT Upper Limits
  46. GRB 121209A: MAXI/GSC detection
  47. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  48. GRB 121211A: RATIR Optical and NIR Observations
  49. GRB121212A: Swift/UVOT Detection
  50. GRB 121212A: Swift detection of a burst
  51. GRB 121211A: Swift/UVOT Detection
  52. GRB 121211A: MITSuME Okayama Optical Observation
  53. GRB 121209A: Keck observations
  54. GRB 121209A: EVLA Observations
  55. GRB121209A: RATIR Optical and NIR Upper Limits
  56. GRB 121209A: GROND optical afterglow candidate
  57. GRB 121209A: UVOT Observation
  58. GRB 121202A: Swift/UVOT Upper Limits
  59. GRB121202A: Swift/UVOT Observations
  60. GRB 121201A: GROND afterglow observations and photometric redshift
  61. GRB 121201A: Swift/UVOT Detection
  62. GRB 121128A: MITSuME Akeno Optical upper limits
  63. GRB 121125A: optical upper limit
  64. GRB 121128A: Swift/UVOT Detection
  65. GRB 121123A: Swift/UVOT Observations
  66. GRB 121125A: Swift/UVOT Detection
  67. GRB 121125A: MASTER-NET optical observations
  68. GRB 121123A: MASTER-NET optical limit
  69. GRB 121108A: optical upper limit
  70. Konus-Wind observation of GRB 121118B
  71. GRB 121117A: optical upper limit
  72. GRB 121117A: Swift/UVOT Observations
  73. GRB 121117A: MASTER prompt optical limit
  74. GRB 121117A: BOOTES-3 early optical upper limit
  75. GRB 121108A: Swift/UVOT Upper Limits
  76. GRB 121108A: Xinglong TNT upper limit
  77. GRB 121108A: MITSuME Ishigakijima upper limits
  78. GRB 121108A: MASTER early prompt optical limit
  79. GRB 121108A: Swift detection of a burst
  80. GRB 121028A: Swift/UVOT Upper Limits
  81. GRB 121102A: Swift/UVOT Upper Limits
  82. GRB 121031A: Swift/UVOT Upper Limits
  83. GRB 121025A: Confirmation of the X-ray afterglow
  84. GRB 121102A: Swift detection of a burst
  85. GRB 121027A: sub-mm upper limit
  86. GRB 121027A: Swift/UVOT Possible Detection
  87. GRB 121027A: MASTER early prompt optical limit
  88. GRB 121028A: MITSuME Okayama Optical upper limits
  89. GRB 121028A: Swift detection of a burst
  90. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  91. GRB 121027A: Swift detection of a burst
  92. GRB 121024A: Swift/UVOT Observations
  93. GRB 121024A: MITSuME Ishigakijima upper limits
  94. GRB 121024A: MITSuME Okayama Optical upper limits
  95. GRB 121025A: MAXI/GSC detection
  96. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  97. GRB 121017A: Swift/UVOT Upper Limits
  98. GRB 121017A: GROND Observations
  99. GRB 121017A: Swift detection of a burst
  100. PdB IRAM observation of GRB 121011A

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