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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"

15250 results found.

  1. GRB 150302A: Swift/UVOT Upper Limits
  2. GRB 150302A: MITSuME Okayama upper limits
  3. GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
  4. GRB 150220A: further Swift-XRT observations
  5. GRB 150301B: Swift/UVOT Observations
  6. GRB 150301B: Fermi GBM detection
  7. GRB 150301B: GROND afterglow observations
  8. GRB 150301C : (Swift trigger 633105) Swift observations
  9. GRB 150301A: GROND Observations
  10. GRB 150301A: Fermi GBM observation
  11. Fermi GBM Observations of Magnetar 4U 0142+61
  12. GRB 150222A: Further GROND Observations
  13. GRB 150220A: Fermi GBM observation
  14. Konus-Wind observation of GRB 150220A
  15. GRB 150220A: Swift ToO observations
  16. GRB 150222A: I-band observations from OSN
  17. Fermi GBM Observations of SGR 1935+2154
  18. Fermi GBM trigger 150223068 is not a GRB
  19. GRB 150222A: MASTER early optical observations
  20. Swift detection of an outburst from SGR 1935+2154
  21. GRB 150219A: Fermi GBM observation
  22. GRB 150219A: Swift ToO observations
  23. GRB 150219A: A long GRB detected by INTEGRAL
  24. GRB 150212A: Skynet DSO14/GORT observations
  25. GRB 150212A: MASTER optical observations
  26. GRB 150212A: P60 Afterglow Retraction
  27. Konus-Wind observation of GRB 150211A
  28. GRB 150210A: Tiled Swift observations
  29. Konus-Wind observation of GRB 150210A
  30. GRB 150210A: Fermi-LAT detection
  31. GRB 150211A: MASTER early optical observations
  32. GRB 150210A: Fermi GBM detection
  33. GRB 150204A: GROND observations
  34. GRB 150202B: Swift/XRT afterglow confirmation
  35. GRB 150204A: Swift/XRT afterglow confirmation
  36. Konus-Wind observation of GRB 150206A
  37. Konus-Wind observation of GRB 150202B
  38. GRB 140206B: Continued iPTF Observations
  39. GRB 150206A: GROND afterglow observations
  40. GRB 150206B: Fermi GBM detection
  41. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  42. GRB 150204A: Fermi GBM detection
  43. GRB 150204A: Swift ToO observations
  44. GRB 150204A BAT refined analysis
  45. Swift Trigger 629693 was a noise event
  46. IPN Triangulation of GRB 150202B
  47. GRB 150202B: Tiled Swift observations
  48. GRB 150203A: REM optical and NIR observations
  49. GRB 150203A: Fermi GBM observation
  50. GRB 150202B: Fermi GBM detection
  51. GRB 150203A: GROND Upper limits
  52. GRB 150202B: Fermi-LAT detection
  53. GRB 150202A: GROND Upper limits
  54. Konus-Wind observation of GRB 150201A
  55. GRB 150201A: GROND upper limits
  56. GRB 150201A: Fermi GBM observation
  57. GRB 150127B: Fermi GBM detection
  58. Konus-Wind observation of GRB 150127B
  59. GRB 150123A: MASTER inspection
  60. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  61. GRB 150127A: Fermi-LAT detection
  62. GRB150127A: Fermi GBM Detection
  63. GRB 150126A: Fermi GBM Detection
  64. Konus-Wind observation of GRB 150123A
  65. GRB 150123A Tiled Swift observations
  66. Konus-Wind observation of GRB 150118B
  67. GRB 150120B: Swift/UVOT Upper Limits
  68. GRB 150120B, Optical observations
  69. GRB 150120B: GROND Afterglow Detection
  70. GRB 150120B: MITSuME Okayama upper limits
  71. GRB 150118C: Fermi GBM Detection
  72. Konus-Wind observation of GRB 150118C
  73. GRB 150101B/Swift J123205.1-105602: TNG NIR follow-up
  74. GRB 150101B/Swift J123205.1-105602, deep VLT observations
  75. GRB 150120A: Fermi GBM observation
  76. GRB 150120B: FTN optical afterglow confirmation
  77. GRB 150101B/Swift J123205.1-105602: continued WSRT radio and VLT optical observations
  78. GRB 150118B: Fermi GBM Detection
  79. GRB 150118B: Fermi-LAT detection
  80. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  81. GRB 150110C Tiled Swift observations
  82. GRB 150110B: Fermi GBM Detection
  83. GRB 150110A: Fermi GBM Detection
  84. GRB 150101B/Swift J123205.1-105602: Chandra observations
  85. GRB 150101B/Swift J123205.1-105602: VLT observations and redshift
  86. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  87. Konus-Wind observation of GRB 141229A
  88. Swift-XRT and UVOT follow-up of iPTF14jko (GRB 141230A)
  89. GRB 141230A: Fermi GBM detection
  90. GRB 141229A: Nanshan optical upper limit
  91. GRB 141229A: Fermi GBM detection
  92. GRB 141229A Tiled Swift observations
  93. GRB 141225A: MITSuME Okayama upper limits
  94. GRB 141225A: Swift/UVOT refined analysis
  95. GRB 141225A: Nanshan very early optical observations
  96. GRB 141225A: Optical aftergow confirmation
  97. GRB 141221A: Keck spectroscopy
  98. Konus-Wind observation of GRB 141222A
  99. IPN Triangulation of GRB 141222A (very intense)
  100. GRB 141222A: Fermi-LAT detection

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