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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.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19607 results found.

  1. IPN Triangulation of GRB 180728B (short)
  2. GRB 180728A: Swift-BAT refined analysis
  3. GRB 180728A: Fermi GBM observation
  4. GRB 180728A: Swift-XRT refined Analysis
  5. GRB 180728A: Enhanced Swift-XRT position
  6. GRB 180728A: MASTER OT J165415.75-540239.27 is the Optical Counterpart of GRB
  7. GRB 180728A: Swift-XRT observations
  8. GRB 180728A: MASTER OT (= new object) detection
  9. GRB 180727A: Swift-BAT refined analysis
  10. GRB 180728A: Swift detection of a bright burst
  11. GRB 180727A: Swift-XRT refined Analysis
  12. GRB 180727A: Fermi GBM observation
  13. GRB 180727A: Swift detection of a burst
  14. GRB 180720B: CALET Gamma-Ray Burst Monitor detection
  15. GRB 180720B: OAJ optical observations
  16. GRB 180720B long follow up requested
  17. GRB 180721A: KAIT Optical Upper Limit
  18. GRB 180720B: KAIT Optical Observations
  19. GRB 180722A: Swift-XRT observations
  20. GRB 180718B: Swift-XRT observations
  21. GRB 180718A: Swift-XRT observations
  22. GRB 180720B: MASTER Global Net OT observations
  23. GRB 180720B: ISON-Castelgrande optical observations
  24. GRB 180721A: BOOTES-5/JGT optical observations
  25. GRB 180720C: BOOTES-2/TELMA optical observations
  26. GRB 180722A: Tiled Swift observations
  27. GRB 180721A: Swift/UVOT Upper Limits
  28. GRB 180715A: AstroSat CZTI detection
  29. Konus-Wind observation of GRB 180720B
  30. GRB 180720C: Swift-XRT refined Analysis
  31. GRB 180721A: Swift-BAT refined analysis
  32. GRB 180720C: Swift-BAT refined analysis
  33. GRB 180721A: Swift-XRT refined Analysis
  34. GRB 180720B: Swift-BAT refined analysis
  35. GRB 180721A: Enhanced Swift-XRT position
  36. GRB 180721A: LCO Haleakala observations
  37. GRB 180721A: Swift detection of a burst
  38. GRB 180720B: MAXI/GSC detection
  39. GRB 180720C: Swift/UVOT Upper Limits
  40. GRB 180720C: LT observations
  41. GRB 180720C: Fermi GBM observation
  42. GRB 180706A: OSN detection
  43. GRB 180720C: Enhanced Swift-XRT position
  44. GCN 22984 was for GRB 180720B
  45. GRB 180720B: OSN detection, fading slower?
  46. GRB 180720B: Swift-XRT refined Analysis
  47. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  48. GRB 180720B: Fermi GBM observation
  49. GRB 180720B : Fermi-LAT detection
  50. GRB 180715A: MASTER optical observation
  51. GRB 180720B: Kanata 1.5m optical/NIR observation
  52. GRB 180720B: LCO Haleakala possible bright optical candidate
  53. Correction: Swift trigger #848890 is GRB 180720B (not GRB 180720A)
  54. GRB 180720B: Swift detection of a burst
  55. GRB 180718A: MASTER optical observation
  56. GRB 180715A: Gemini imaging upper limits
  57. GRB 180715A: Swift/UVOT Upper Limits
  58. Swift detects a flare from AX 1631.9-4752
  59. GRB 180718A: Swift ToO observations
  60. GRB 180718B: Swift ToO observations
  61. GRB 180718B: Fermi-LAT detection
  62. GRB 180718A: Fermi GBM detection
  63. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  64. Swift Trigger 848621 is not an astrophysical event
  65. Trigger 848584: Swift detection of AX 1631.9-4752
  66. GRB 180715A: CALET Gamma-Ray Burst Monitor detection
  67. GRB 180715A: Swift-XRT observations
  68. GRB 180715A: Fermi GBM detection
  69. GRB 180715A: Swift-BAT refined analysis
  70. GRB 180715A: GOTO optical limits
  71. GRB 180715A: LCO Sutherland possible optical candidate
  72. GRB 180715A: Swift-XRT observations
  73. GRB 180715A: Swift detection of a short hard burst
  74. IceCube-171106A: MASTER optical observation
  75. GRB 180703A: optical afterglow confirmation
  76. Swift Trigger 847216: misidentification of IGR J16385-2057
  77. GRB 180709A: BOOTES-5/JGT optical observations
  78. GRB 180709A: Swift-BAT refined analysis
  79. GRB 180709A: Swift/UVOT Upper Limits
  80. GRB 180709A: Swift-XRT refined Analysis
  81. GRB 180709A: Optical limits
  82. GRB 180709A: Enhanced Swift-XRT position
  83. GRB 180703A: Swift-XRT afterglow detection
  84. GRB 180709A: Swift detection of a burst
  85. GRB 180705A: RTT150 optical upper limit
  86. Trigger 846740: Swift trigger near NGC5055
  87. IPN Triangulation of GRB 180703A
  88. GRB 180706A: Swift/UVOT Detection
  89. GRB 180706A: Swift-BAT refined analysis
  90. GRB 180705A: Swift-XRT refined Analysis
  91. GRB 180706A: Fermi GBM observation
  92. Konus-Wind observation of GRB 180704A
  93. GRB 180706A: Swift-XRT refined Analysis
  94. GRB 180706A: Enhanced Swift-XRT position
  95. GRB 180705A: TSHAO optical upper limit
  96. GRB 180705A: Swift/UVOT Upper Limits
  97. GRB 180705A: RATIR Optical Observations
  98. GRB 180706A: Swift detection of a burst with optical counterpart
  99. IPN Triangulation of GRB 180703B
  100. GRB 180705A: Swift-BAT refined analysis

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