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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"

3735 results found.

  1. GRB 150428C: Tiled Swift observations
  2. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  3. GRB 150428A: Danish1.56m optical observations
  4. GRB 150428A: Enhanced Swift-XRT position
  5. GRB 150428A: GROND Dark Burst Host Candidate
  6. GRB 150428B: Swift detection of a burst
  7. GRB 150428A: Swift detection of a burst
  8. Trigger 639199: Swift detection of IGRJ16418-4532
  9. GRB 150424A: NOT optical observations
  10. GRB 150424B: Fermi GBM detection
  11. Konus-Wind observation of GRB 150424A
  12. GRB 150424B: Tiled Swift observations
  13. GRB 150424B: MAXI/GSC detection
  14. GRB 150424A: Swift detection of a short burst
  15. GRB 150422A: Fermi GBM detection
  16. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  17. Konus-Wind observation of GRB 150418A
  18. GRB150418A: Swift/UVOT did not detect a new source
  19. GRB 150418A: Swift-XRT observations
  20. GRB 150418A: Tiled Swift observations
  21. GRB 150418A: MAXI/GSC detection
  22. GRB 150413A: MAXI/GSC detection
  23. GRB 150413A: MASTER bright OT detection
  24. Konus-Wind observation of GRB 150403A
  25. GRB 150323C: Khureltogot optical observations
  26. IPN Triangulation of GRB 150330A (long/very intense)
  27. GRB 141121A: GMG observation
  28. GRB 150323A: P60 Optical Afterglow Candidate
  29. GRB 150314A: KAIT Optical Observations
  30. GRB 150314A: KAIT Optical Candidate
  31. GRB 150313A: MAXI/GSC detection
  32. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  33. GRB 150311A: MAXI/GSC possible afterglow detection
  34. GRB 150309A: Swift-BAT refined analysis
  35. GRB 150301B: Swift/UVOT Observations
  36. GRB 150301A: Swift-BAT refined analysis
  37. GRB 150301B: MASTER early OT detection
  38. GRB 150301B: Swift detection of a burst with an optical afterglow
  39. GRB 150222B: MAXI/GSC detection
  40. Fermi GBM Observations of SGR 1935+2154
  41. SGR 1935+2154: Swift-BAT refined analysis
  42. GRB 150222A: MASTER early optical observations
  43. Trigger 631747: Swift detection of 4U 0614+09
  44. GRB 150213B: Swift-BAT refined analysis
  45. GRB 150212A: Swift detection of a burst
  46. GRB 150211A: Swift-BAT refined analysis
  47. Konus-Wind observation of GRB 150206A
  48. GRB 150206B: Fermi GBM detection
  49. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  50. GRB 150206A: MAXI/GSC detection
  51. GRB 150203A: Swift-BAT refined analysis
  52. Fermi GBM trigger 150202624 is not a GRB
  53. GRB 150203A: Enhanced Swift-XRT position
  54. GRB 150203A: Prompt enhanced Swift-XRT position
  55. GRB 150203A: Swift detection of a burst
  56. Konus-Wind observation of GRB 150127B
  57. GRB 150123A: MASTER inspection
  58. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  59. GRB 150126A: Fermi GBM Detection
  60. GRB 150126A: MAXI/GSC afterglow candidate detection
  61. Konus-Wind observation of GRB 150123A
  62. GRB 150123A: Swift/UVOT observations
  63. GRB 150123A: Swift-XRT observations
  64. GRB 150123A Tiled Swift observations
  65. GRB 150123A: MAXI/GSC detection
  66. GRB 150120A: Fermi GBM observation
  67. GRB 150120A: Swift detection of a possibly-short burst
  68. Trigger 626581: Swift detection of GRO J1008-57
  69. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  70. GRB 150110C: Swift/UVOT Upper Limits
  71. GRB 150110C: Swift-XRT observations
  72. GRB 150110A: MASTER inspection
  73. GRB 150110C Tiled Swift observations
  74. GRB 150110C: MAXI/GSC detection
  75. GRB 150110A: Fermi GBM Detection
  76. GRB 150110A: MAXI/GSC detection
  77. Swift detection of 4U 1700+24 (= V* V934 Her)
  78. GRB 150103A: Swift-BAT refined analysis
  79. Short burst found in ground analysis of Swift-BAT data
  80. Konus-Wind observation of GRB 141229A
  81. GRB 141229A: Deep MASTER inspection
  82. GRB 141229A: Nanshan optical upper limit
  83. GRB 141229A: Swift-XRT observations
  84. GRB 141229A: Fermi GBM detection
  85. GRB 141229A: MAXI/GSC detection
  86. IPN Triangulation of GRB 141222A (very intense)
  87. GRB 141220A: Swift-BAT refined analysis
  88. GRB 141220A: LT optical afterglow observations
  89. IPN Triangulation of GRB 141215A (long/intense)
  90. Konus-Wind observation of GRB 141212B
  91. GRB 141212B: Swift detection of a burst
  92. GRB 141121A: SPI-ACS/INTEGRAL observations
  93. Konus-Wind observation of GRB 141121A
  94. IPN Triangulation of GRB 141125A (short/hard)
  95. GRB 141121A: Mondy optical observations
  96. GRB 141121A: MAXI/GSC detection
  97. GRB141121A: BOOTES-2/TELMA upper limit
  98. GRB 141109A: further VLA observations
  99. GRB 141109B: MITSuME Akeno upper limits
  100. GRB 141102A: Fermi GBM detection

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