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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"

802 results found.

  1. Konus-Wind observation of GRB 150518A
  2. GRB 150518A: Swift-XRT follow-up observations
  3. GRB 150518A: Correction
  4. GRB 150518A: VLT/X-shooter redshift of the likely host galaxy
  5. Swift/UVOT observations of GRB150518A
  6. GRB 150518A: Swift-XRT afterglow detection
  7. GRB 150518A: Tiled Swift observations
  8. GRB 150518A: MAXI/GSC detection
  9. Konus-Wind observation of GRB 150430A
  10. GRB 150430A: Fermi GBM Detection
  11. GRB 150430A: MAXI/GSC detection
  12. GRB 150428C: Swift-XRT observations
  13. GRB 150428C: Tiled Swift observations
  14. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  15. GRB 150424B: Fermi GBM detection
  16. GRB 150424B: Tiled Swift observations
  17. GRB 150424B: MAXI/GSC detection
  18. Konus-Wind observation of GRB 150418A
  19. GRB150418A: Swift/UVOT did not detect a new source
  20. GRB 150418A: Swift-XRT observations
  21. GRB 150418A: Tiled Swift observations
  22. GRB 150418A: MAXI/GSC detection
  23. GRB 150413A: MAXI/GSC detection
  24. GRB 150313A: MAXI/GSC detection
  25. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  26. GRB 150311A: MAXI/GSC possible afterglow detection
  27. GRB 150222B: MAXI/GSC detection
  28. Konus-Wind observation of GRB 150206A
  29. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  30. GRB 150206A: MAXI/GSC detection
  31. GRB 150123A: MASTER inspection
  32. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  33. GRB 150126A: Fermi GBM Detection
  34. GRB 150126A: MAXI/GSC afterglow candidate detection
  35. Konus-Wind observation of GRB 150123A
  36. GRB 150123A: Swift/UVOT observations
  37. GRB 150123A: Swift-XRT observations
  38. GRB 150123A Tiled Swift observations
  39. GRB 150123A: MAXI/GSC detection
  40. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  41. GRB 150110C: Swift/UVOT Upper Limits
  42. GRB 150110C: Swift-XRT observations
  43. GRB 150110A: MASTER inspection
  44. GRB 150110C Tiled Swift observations
  45. GRB 150110C: MAXI/GSC detection
  46. GRB 150110A: Fermi GBM Detection
  47. GRB 150110A: MAXI/GSC detection
  48. Konus-Wind observation of GRB 141229A
  49. GRB 141229A: Deep MASTER inspection
  50. GRB 141229A: Nanshan optical upper limit
  51. GRB 141229A: Swift-XRT observations
  52. GRB 141229A: Fermi GBM detection
  53. GRB 141229A: MAXI/GSC detection
  54. GRB 141121A: SPI-ACS/INTEGRAL observations
  55. Konus-Wind observation of GRB 141121A
  56. GRB 141121A: MAXI/GSC detection
  57. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  58. GRB 141029A: Nanshan optical upper limit
  59. GRB 141029A Tiled Swift observations
  60. GRB 141029A: MAXI/GSC detection
  61. GRB 141020B: MAXI/GSC detection
  62. GRB 140930A/MAXI J2259+524: MASTER optical observations
  63. GRB 140928A: MAXI-GSC detection
  64. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  65. GRB 140903A: MAXI/GSC upper limit
  66. GRB 140818A: GROND confirmation of afterglow candidate
  67. Konus-Wind observation of GRB 140818A
  68. GRB 140818A - Fermi GBM Detection
  69. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  70. GRB 140818A: Correction to GCN 16702
  71. GRB 140818A Tiled Swift observations
  72. GRB 140818A: MAXI/GSC detection
  73. GRB 140814A: Swift-XRT and UVOT observations
  74. GRB 140814A: MASTER optical follow-up inspection
  75. GRB 140814A: Swift-XRT and UVOT observations
  76. GRB 140814A: MAXI/GSC detection
  77. Swift observations of a flare from UX Ari
  78. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  79. GRB 140515B: MAXI/GSC detection
  80. GRB 140509B: MAXI/GSC detection
  81. MAXI ID=745548350 is UV Ceti
  82. GRB 140219A: Suzaku WAM observation of the prompt emission
  83. GRB 140219A: MAXI/GSC detection
  84. GRB 140221A: Results from Swift XRT tiled observations
  85. GRB 140221A Tiled Swift observations
  86. GRB 140221A: MAXI/GSC detection
  87. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  88. Konus-Wind observation of GRB 131215A
  89. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  90. Swift Trigger 584155 is MAXI J1421-613
  91. Konus-Wind observation of GRB 140102A
  92. GRB 140102A: MAXI/GSC detection
  93. GRB 131225A: MASTER-Net optical observations
  94. GRB 131225A: MAXI/GSC detection
  95. GRB 131215A: MAXI/GSC detection
  96. IPN Observations of GRB 130925A
  97. GRB 130925A: Fermi GBM Detection
  98. Konus-Wind observation of GRB 130925A
  99. GRB 130925A: Swift-XRT refined Analysis
  100. GRB 130925A: Initial Similarities to Swift J1644+57

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