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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"

19599 results found.

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

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