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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"

995 results found.

  1. GRB 141029A: Nanshan optical upper limit
  2. GRB 141029A Tiled Swift observations
  3. GRB 141029A: MAXI/GSC detection
  4. GRB 141020B: MAXI/GSC detection
  5. GRB 140930A/MAXI J2259+524: MASTER optical observations
  6. GRB 140928A: MAXI-GSC detection
  7. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  8. GRB 140903A: MAXI/GSC upper limit
  9. GRB 140818A: GROND confirmation of afterglow candidate
  10. Konus-Wind observation of GRB 140818A
  11. GRB 140818A - Fermi GBM Detection
  12. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  13. GRB 140818A: Correction to GCN 16702
  14. GRB 140818A Tiled Swift observations
  15. GRB 140818A: MAXI/GSC detection
  16. GRB 140814A: Swift-XRT and UVOT observations
  17. GRB 140814A: MASTER optical follow-up inspection
  18. GRB 140814A: Swift-XRT and UVOT observations
  19. GRB 140814A: MAXI/GSC detection
  20. Konus-Wind observation of GRB 140729A
  21. Swift observations of a flare from UX Ari
  22. GRB 140714A: Fermi GBM detection
  23. GRB 140709B: Fermi GBM detection
  24. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  25. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  26. GRB 140614B: Swift/UVOT Upper Limits
  27. GRB 140614A: Swift/UVOT Upper Limits
  28. GRB 140614B: Swift detection of a burst
  29. GRB 140515B: MAXI/GSC detection
  30. GRB 140509B: MAXI/GSC detection
  31. GRB 140430A: Swift-XRT refined Analysis
  32. Konus-Wind observation of GRB 140329A
  33. MAXI ID=745548350 is UV Ceti
  34. GRB 140318A: Swift/UVOT Upper Limits
  35. GRB 140318A: Swift detection of a burst
  36. GRB140308A: Suzaku WAM observation of the prompt emission
  37. GRB 140219A: Suzaku WAM observation of the prompt emission
  38. GRB 140219A: MAXI/GSC detection
  39. GRB 140102A: TAOS early optical afterglow detection
  40. GRB 140221A: Results from Swift XRT tiled observations
  41. GRB 140221A Tiled Swift observations
  42. GRB 140221A: MAXI/GSC detection
  43. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  44. Konus-Wind observation of GRB 131215A
  45. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  46. Swift Trigger 584155 is MAXI J1421-613
  47. Konus-Wind observation of GRB 140102A
  48. GRB 140102A: MAXI/GSC detection
  49. GRB 131225A: MASTER-Net optical observations
  50. GRB 131225A: MAXI/GSC detection
  51. GRB 131215A: MAXI/GSC detection
  52. IPN Observations of GRB 130925A
  53. GRB 130925A: Fermi GBM Detection
  54. Konus-Wind observation of GRB 130925A
  55. GRB 130925A: Swift-XRT refined Analysis
  56. GRB 130925A: Initial Similarities to Swift J1644+57
  57. GRB 130925A: MAXI/GSC detection
  58. GRB 130701B: Fermi GBM detection
  59. GRB 130505B: Further Swift observations
  60. GRB 130505B: Swift Candidate Afterglow
  61. GRB 130505B: MAXI/GSC detection
  62. GRB 130505A: MAXI/GSC detection
  63. GRB 130427A: MAXI/GSC detection
  64. GRB 130407A: Swift-XRT observations
  65. GRB 130407A Tiled Swift observations
  66. GRB 130407A: MAXI/GSC detection
  67. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  68. Swift Trigger 547142: MAXI/GSC upper limit
  69. GRB 130102B: MASTER synchronous observations
  70. Konus-Wind observation of GRB 130102B
  71. GRB 130102B: MAXI/GSC detection
  72. GRB 121229A: MAXI/GSC detection
  73. GRB 121225A: MAXI/GSC detection
  74. GRB 121209A: MAXI/GSC detection
  75. GRB 121025A: Confirmation of the X-ray afterglow
  76. GRB 121027A: Swift-XRT refined Analysis
  77. GRB 121025A: Swift-XRT observation
  78. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  79. GRB 121025A: MAXI/GSC detection
  80. Swift Trigger 534017 is probably not real.
  81. GRB 120911B: Fermi GBM observation
  82. GRB 120908A: Fermi GBM detection
  83. GRB 120908A: Swift Observations
  84. GRB 120908A: MAXI/GSC detection
  85. Konus-Wind observation of GRB 120711A
  86. GRB 120711A: Fermi LAT detection
  87. GRB 120711A: GROND photometric redshift
  88. GRB 120711A: MAXI/GSC detection
  89. XRF 120626B: MAXI/GSC detection
  90. GRB 120622A: MAXI/GSC detection
  91. GRB 120614A: MAXI/GSC detection of a burst
  92. Konus-Wind observation of GRB 120528B
  93. GRB 120528C: MAXI/GSC detection
  94. GRB 120528B: MAXI/GSC detection
  95. Konus-Wind observation of GRB 120510A
  96. GRB 120514A: Swift-XRT refined Analysis
  97. GRB 120510A: Swift XRT and UVOT observations
  98. GRB 120510A: MASTER follow up observations
  99. GRB 120510A: MAXI/GSC detection of a burst
  100. GRB 120424A: MAXI/GSC detection of a burst

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