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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"

15247 results found.

  1. GRB 150220A: further Swift-XRT observations
  2. GRB 150301B: Swift/UVOT Observations
  3. GRB 150301B: Fermi GBM detection
  4. GRB 150301B: GROND afterglow observations
  5. GRB 150301C : (Swift trigger 633105) Swift observations
  6. GRB 150301A: GROND Observations
  7. GRB 150301A: Fermi GBM observation
  8. Fermi GBM Observations of Magnetar 4U 0142+61
  9. GRB 150222A: Further GROND Observations
  10. GRB 150220A: Fermi GBM observation
  11. Konus-Wind observation of GRB 150220A
  12. GRB 150220A: Swift ToO observations
  13. GRB 150222A: I-band observations from OSN
  14. Fermi GBM Observations of SGR 1935+2154
  15. Fermi GBM trigger 150223068 is not a GRB
  16. GRB 150222A: MASTER early optical observations
  17. Swift detection of an outburst from SGR 1935+2154
  18. GRB 150219A: Fermi GBM observation
  19. GRB 150219A: Swift ToO observations
  20. GRB 150219A: A long GRB detected by INTEGRAL
  21. GRB 150212A: Skynet DSO14/GORT observations
  22. GRB 150212A: MASTER optical observations
  23. GRB 150212A: P60 Afterglow Retraction
  24. Konus-Wind observation of GRB 150211A
  25. GRB 150210A: Tiled Swift observations
  26. Konus-Wind observation of GRB 150210A
  27. GRB 150210A: Fermi-LAT detection
  28. GRB 150211A: MASTER early optical observations
  29. GRB 150210A: Fermi GBM detection
  30. GRB 150204A: GROND observations
  31. GRB 150202B: Swift/XRT afterglow confirmation
  32. GRB 150204A: Swift/XRT afterglow confirmation
  33. Konus-Wind observation of GRB 150206A
  34. Konus-Wind observation of GRB 150202B
  35. GRB 140206B: Continued iPTF Observations
  36. GRB 150206A: GROND afterglow observations
  37. GRB 150206B: Fermi GBM detection
  38. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  39. GRB 150204A: Fermi GBM detection
  40. GRB 150204A: Swift ToO observations
  41. GRB 150204A BAT refined analysis
  42. Swift Trigger 629693 was a noise event
  43. IPN Triangulation of GRB 150202B
  44. GRB 150202B: Tiled Swift observations
  45. GRB 150203A: REM optical and NIR observations
  46. GRB 150203A: Fermi GBM observation
  47. GRB 150202B: Fermi GBM detection
  48. GRB 150203A: GROND Upper limits
  49. GRB 150202B: Fermi-LAT detection
  50. GRB 150202A: GROND Upper limits
  51. Konus-Wind observation of GRB 150201A
  52. GRB 150201A: GROND upper limits
  53. GRB 150201A: Fermi GBM observation
  54. GRB 150127B: Fermi GBM detection
  55. Konus-Wind observation of GRB 150127B
  56. GRB 150123A: MASTER inspection
  57. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  58. GRB 150127A: Fermi-LAT detection
  59. GRB150127A: Fermi GBM Detection
  60. GRB 150126A: Fermi GBM Detection
  61. Konus-Wind observation of GRB 150123A
  62. GRB 150123A Tiled Swift observations
  63. Konus-Wind observation of GRB 150118B
  64. GRB 150120B: Swift/UVOT Upper Limits
  65. GRB 150120B, Optical observations
  66. GRB 150120B: GROND Afterglow Detection
  67. GRB 150120B: MITSuME Okayama upper limits
  68. GRB 150118C: Fermi GBM Detection
  69. Konus-Wind observation of GRB 150118C
  70. GRB 150101B/Swift J123205.1-105602: TNG NIR follow-up
  71. GRB 150101B/Swift J123205.1-105602, deep VLT observations
  72. GRB 150120A: Fermi GBM observation
  73. GRB 150120B: FTN optical afterglow confirmation
  74. GRB 150101B/Swift J123205.1-105602: continued WSRT radio and VLT optical observations
  75. GRB 150118B: Fermi GBM Detection
  76. GRB 150118B: Fermi-LAT detection
  77. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  78. GRB 150110C Tiled Swift observations
  79. GRB 150110B: Fermi GBM Detection
  80. GRB 150110A: Fermi GBM Detection
  81. GRB 150101B/Swift J123205.1-105602: Chandra observations
  82. GRB 150101B/Swift J123205.1-105602: VLT observations and redshift
  83. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  84. Konus-Wind observation of GRB 141229A
  85. Swift-XRT and UVOT follow-up of iPTF14jko (GRB 141230A)
  86. GRB 141230A: Fermi GBM detection
  87. GRB 141229A: Nanshan optical upper limit
  88. GRB 141229A: Fermi GBM detection
  89. GRB 141229A Tiled Swift observations
  90. GRB 141225A: MITSuME Okayama upper limits
  91. GRB 141225A: Swift/UVOT refined analysis
  92. GRB 141225A: Nanshan very early optical observations
  93. GRB 141225A: Optical aftergow confirmation
  94. GRB 141221A: Keck spectroscopy
  95. Konus-Wind observation of GRB 141222A
  96. IPN Triangulation of GRB 141222A (very intense)
  97. GRB 141222A: Fermi-LAT detection
  98. GRB 141215A: further Swift-XRT observations and afterglow detection
  99. GRB 141221A: Fermi GBM observation
  100. GRB141221A: GROND Afterglow Detection

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