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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"

37733 results found.

  1. IPN Triangulation of GRB 171216B
  2. GRB 171216A: Swift/UVOT Upper Limits
  3. GRB 171210A: Further Swift-XRT observations
  4. GRB 171216A: Swift-XRT refined Analysis
  5. GRB 171216A: Swift-BAT refined analysis
  6. GRB 171205A: RATAN observations
  7. GRB 171216A: Enhanced Swift-XRT position
  8. GRB 171216A: Swift detection of a burst
  9. Swift Trigger 797070: KAIT Optical Observations
  10. Swift Trigger 797070 is probably not a GRB
  11. GRB 171212A/Swift J1935.7+2036: Swift-BAT refined analysis
  12. GRB 171205A: ALMA observations
  13. GRB 171212A: Swift-XRT refined Analysis
  14. GRB 171211A iTelescope observation
  15. GRB 171212B: Fermi GBM observation
  16. GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
  17. GRB 171212B: Fermi-LAT detection
  18. GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
  19. GRB 171212A: Enhanced Swift-XRT position
  20. Konus-Wind observation of GRB 171210A
  21. GRB 171212A: Swift detection of a burst or a Galactic transient
  22. GRB 171205A: JCMT SCUBA-2 sub-mm observations
  23. GRB 171211A: Swift-BAT refined analysis
  24. GRB 171211A: Swift-XRT refined Analysis
  25. GRB 171211A: Swift/UVOT Upper Limits
  26. GRB 171210A: MASTER-Net optical observations
  27. GRB 171209A: MASTER-Net optical observations
  28. GRB 171211A: Enhanced Swift-XRT position
  29. GRB 171210A: Swift-XRT and UVOT observations
  30. GRB 171211A: Swift detection of a possibly short burst
  31. GRB 171210A: Fermi GBM detection
  32. GRB 171210A: Swift ToO observations
  33. Correction to GCN 22184: GRB 171205A: Swift-BAT refined analysis
  34. GRB 171209A: Lulin 1m telescope observations
  35. GRB 171209A: Swift-BAT refined analysis
  36. GRB 171210A: Fermi-LAT detection
  37. Konus-Wind observation of GRB 171205A
  38. GRB 171205A: MASTER-Net OT recent photometry
  39. GRB 171205A: iTelescope optical observations
  40. GRB 171205A: Mondy optical observations
  41. GRB 171205A: SAO-RAS optical observations
  42. GMRT upper limit on GRB 171205A
  43. GRB 171209A: Swift/UVOT Analysis of the burst
  44. GRB 171209A: Swift-XRT refined Analysis
  45. GRB 171209A: Enhanced Swift-XRT position
  46. Swift Trigger 796115 is probably not a GRB
  47. GRB 171205A: VLA detection
  48. GRB 171205A: UKIRT near-IR observations
  49. GRB 171209A: LCO 1-m telescope observations
  50. GRB 171209A: Swift detection of a burst
  51. Swift Trigger 796098 is probably a noise peak near M31
  52. GRB 171124A CALET Gamma-Ray Burst Monitor detection
  53. GRB 171120A CALET Gamma-Ray Burst Monitor detection
  54. GRB 171106A CALET Gamma-Ray Burst Monitor detection
  55. GRB 171205A: TSHAO optical observations
  56. GRB 171205A: Detection of the emerging SN
  57. GRB 171205A: Continued Swift/UVOT Observations
  58. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  59. Fermi GBM trigger 534174346/171205573 is not a GRB
  60. GRB 171205A: MASTER-SAAO optical observations of unusual OT
  61. GRB 171205A: GROND observations of the optical/NIR transient
  62. GRB 171205A: LCO 1-m telescope observations
  63. GRB171205A hyperluminal radio afterglow?
  64. GRB 171205A: GMG observations (2nd night)
  65. GRB 171205A: Host galaxy photometric properties
  66. GRB 171205A: CHILESCOPE optical observations
  67. GRB 171205A: SMARTS optical/IR afterglow observations
  68. Possible blackbody component in the X-ray spectrum of GRB171205A
  69. GRB 171205A: GOTO detection of the optical counterpart
  70. GRB 171205A: TNG NIR detections
  71. GRB 171205A: LSGT optical afterglow follow-up observation
  72. GRB 171205A: NOEMA detection of a bright mm afterglow
  73. GRB 171205A: GMG observation
  74. Fermi Gamma-ray Burst Monitor trigger 534174346/171205573 is not a GRB
  75. GRB 171205A: Swift-BAT refined analysis
  76. GRB 171205A: Swift-XRT refined Analysis
  77. GRB 171205A: RATIR Optical and NIR Observations
  78. GRB 171205A: Swift/UVOT Detection
  79. GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
  80. GRB 171205A: Enhanced Swift-XRT position
  81. GRB 171205A: Likely association with low-z spiral galaxy
  82. GRB 171205A: Swift detection of a burst
  83. GRB 171126A: AstroSat CZTI detection
  84. GRB 171124A: TShAO optical observations
  85. GRB 171124A: Swift-XRT afterglow detection
  86. GRB 171124A: Insight-HXMT/HE detection
  87. GRB 171126A: Fermi GBM detection
  88. GRB 171123A: TShAO optical upper limit
  89. GRB 171124A: AstroSat CZTI detection
  90. GRB 171123A: OSN Upper Limit
  91. GRB 171124A: Swift-XRT observations
  92. GRB 171124A: Fermi GBM observation
  93. GRB 171119A: AstroSat CZTI detection
  94. GRB 171123A: Tautenburg observations
  95. GRB 171123A: Nanshan-1m optical upper limit
  96. GRB 171123A: RATIR Optical and NIR Observations
  97. GRB 171124A: MITSuME Akeno optical upper limits
  98. GRB 171123A: Swift/UVOT Upper Limits
  99. GRB 171123A: GMG observation limit
  100. GRB 171124A: Fermi-LAT detection

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