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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

37763 results found.

  1. GRB 180721A: KAIT Optical Upper Limit
  2. GRB 180720B: KAIT Optical Observations
  3. GRB 180722A: Swift-XRT observations
  4. GRB 180718B: Swift-XRT observations
  5. GRB 180718A: Swift-XRT observations
  6. GRB 180723A: CALET Gamma-Ray Burst Monitor detection
  7. GRB 180722B: CALET Gamma-Ray Burst Monitor detection
  8. GRB 180723.13: MASTER optical observation of the short Fermi GBM trigger number 554008254
  9. GRB 180722A: MASTER second inspection
  10. GRB 180723.76: MASTER optical observation of the bright long Fermi GBM trigger number 554062193
  11. GRB 180720B: D50 optical observations
  12. GRB 180720B: MASTER Global Net OT observations
  13. GRB 180721A: MITSuME Akeno optical upper limits
  14. GRB 180720B: REM photometry
  15. GRB 180720B: ISON-Castelgrande optical observations
  16. GRB 180720B: Testing the universality of the newly born neutron star in BdHNe
  17. GRB 180721A: BOOTES-5/JGT optical observations
  18. GRB 180720B: COATLI Optical Detection
  19. GRB 180720C: BOOTES-2/TELMA optical observations
  20. GRB 180722A: Tiled Swift observations
  21. GRB 180721A: Swift/UVOT Upper Limits
  22. GRB 180715B: AstroSat CZTI detection
  23. GRB 180715A: AstroSat CZTI detection
  24. Konus-Wind observation of GRB 180720B
  25. GRB 180720C: MASTER optical observation
  26. Fermi Trigger 553879512: MASTER optical observation
  27. GRB 180722A: MASTER optical observation
  28. GRB 180722A: MAXI/GSC detection
  29. GRB 180720B: MITSuME Ishigaki optical observations
  30. GRB 180720C: Swift-XRT refined Analysis
  31. GRB 180711A: AstroSat CZTI detection
  32. GRB 180721A: Swift-BAT refined analysis
  33. GRB 180720C: Swift-BAT refined analysis
  34. GRB 180721A: Swift-XRT refined Analysis
  35. GRB 180720B: Swift-BAT refined analysis
  36. GRB 180721A: Enhanced Swift-XRT position
  37. GRB 180720B: VLT/X-shooter redshift
  38. GRB 180721A: LCO Haleakala observations
  39. GRB 180721A: Swift detection of a burst
  40. GRB 180720B: MAXI/GSC detection
  41. GRB 180720C: Swift/UVOT Upper Limits
  42. GRB 180720C: LT observations
  43. GRB 180720C: Fermi GBM observation
  44. GRB 180706A: OSN detection
  45. GRB 180720B: LCO optical afterglow observations
  46. GRB 180720C: Enhanced Swift-XRT position
  47. GCN 22984 was for GRB 180720B
  48. GRB 180720B: OSN detection, fading slower?
  49. GRB 180720B: Swift-XRT refined Analysis
  50. GRB 180720B: MITSuME Akeno optical observations
  51. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  52. GRB 180720B: Fermi GBM observation
  53. GRB 180720B : Fermi-LAT detection
  54. GRB 180720B : TSHAO optical observations
  55. GRB 180715A: MASTER optical observation
  56. GRB 180720B: Kanata 1.5m optical/NIR observation
  57. GRB 180720B: LCO Haleakala possible bright optical candidate
  58. Correction: Swift trigger #848890 is GRB 180720B (not GRB 180720A)
  59. GRB 180720A: Fermi GBM observation
  60. GRB 180720B: Swift detection of a burst
  61. GRB 180718A: MASTER optical observation
  62. GRB 180718B: MASTER optical observation
  63. AGILE/MCAL detection of GRB 180720A
  64. GRB180715B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 553369644)
  65. GRB 180715A: Gemini imaging upper limits
  66. GRB 180715A: Swift/UVOT Upper Limits
  67. GRB 180718B: Fermi GBM detection
  68. GRB 180716A: CALET Gamma-Ray Burst Monitor detection
  69. GRB 180718A: Swift ToO observations
  70. GRB 180718B: Swift ToO observations
  71. GRB 180718B: Fermi-LAT detection
  72. GRB 180718A: Fermi GBM detection
  73. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  74. GRB 180715A: CALET Gamma-Ray Burst Monitor detection
  75. GRB 180715A: LCO Sutherland observations
  76. GRB 180715A: COATLI Optical Observations
  77. GRB 180715A: Swift-XRT observations
  78. GRB 180715A: Fermi GBM detection
  79. GRB 180715A: Swift-BAT refined analysis
  80. GRB 180715A: GOTO optical limits
  81. GRB 180715A: LCO Sutherland possible optical candidate
  82. GRB 180715A: Swift-XRT observations
  83. GRB 180715A: Swift detection of a short hard burst
  84. GRB180714A: a long GRB detected by INTEGRAL
  85. IceCube-171106A: MASTER optical observation
  86. GRB 180703A: optical afterglow confirmation
  87. GRB 180711A: CALET Gamma-Ray Burst Monitor detection
  88. GRB 180705A: OSN observations
  89. GRB 180709A: BOOTES-5/JGT optical observations
  90. GRB 180709A: Swift-BAT refined analysis
  91. GRB 180709A: Swift/UVOT Upper Limits
  92. GRB 180709A: Swift-XRT refined Analysis
  93. GRB 180709A: Optical limits
  94. GRB 180709A: COATLI Optical Observations
  95. GRB 180709A: Enhanced Swift-XRT position
  96. GRB 180703B: further analysis of CGBM data
  97. GRB 180703A: Swift-XRT afterglow detection
  98. GRB 180709A: Swift detection of a burst
  99. GRB 180705A: RTT150 optical upper limit
  100. Konus-Wind observation of GRB 180703A

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