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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"

36134 results found.

  1. GRB 171210A: MASTER-Net optical observations
  2. GRB 171209A: MASTER-Net optical observations
  3. GRB 171211A: Enhanced Swift-XRT position
  4. GRB 171210A: Swift-XRT and UVOT observations
  5. GRB 171211A: Swift detection of a possibly short burst
  6. GRB 171210A: Fermi GBM detection
  7. GRB 171210A: Swift ToO observations
  8. Correction to GCN 22184: GRB 171205A: Swift-BAT refined analysis
  9. GRB 171209A: Lulin 1m telescope observations
  10. GRB 171209A: Swift-BAT refined analysis
  11. GRB 171210A: Fermi-LAT detection
  12. Konus-Wind observation of GRB 171205A
  13. GRB 171205A: MASTER-Net OT recent photometry
  14. GRB 171205A: iTelescope optical observations
  15. GRB 171205A: Mondy optical observations
  16. GRB 171205A: SAO-RAS optical observations
  17. GMRT upper limit on GRB 171205A
  18. GRB 171209A: Swift/UVOT Analysis of the burst
  19. GRB 171209A: Swift-XRT refined Analysis
  20. GRB 171209A: Enhanced Swift-XRT position
  21. Swift Trigger 796115 is probably not a GRB
  22. GRB 171205A: VLA detection
  23. GRB 171205A: UKIRT near-IR observations
  24. GRB 171209A: LCO 1-m telescope observations
  25. GRB 171209A: Swift detection of a burst
  26. Swift Trigger 796098 is probably a noise peak near M31
  27. GRB 171124A CALET Gamma-Ray Burst Monitor detection
  28. GRB 171120A CALET Gamma-Ray Burst Monitor detection
  29. GRB 171106A CALET Gamma-Ray Burst Monitor detection
  30. GRB 171205A: TSHAO optical observations
  31. GRB 171205A: Detection of the emerging SN
  32. GRB 171205A: Continued Swift/UVOT Observations
  33. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  34. Fermi GBM trigger 534174346/171205573 is not a GRB
  35. GRB 171205A: MASTER-SAAO optical observations of unusual OT
  36. GRB 171205A: GROND observations of the optical/NIR transient
  37. GRB 171205A: LCO 1-m telescope observations
  38. GRB171205A hyperluminal radio afterglow?
  39. GRB 171205A: GMG observations (2nd night)
  40. GRB 171205A: Host galaxy photometric properties
  41. GRB 171205A: CHILESCOPE optical observations
  42. GRB 171205A: SMARTS optical/IR afterglow observations
  43. Possible blackbody component in the X-ray spectrum of GRB171205A
  44. GRB 171205A: GOTO detection of the optical counterpart
  45. GRB 171205A: TNG NIR detections
  46. GRB 171205A: LSGT optical afterglow follow-up observation
  47. GRB 171205A: NOEMA detection of a bright mm afterglow
  48. GRB 171205A: GMG observation
  49. Fermi Gamma-ray Burst Monitor trigger 534174346/171205573 is not a GRB
  50. GRB 171205A: Swift-BAT refined analysis
  51. GRB 171205A: Swift-XRT refined Analysis
  52. GRB 171205A: RATIR Optical and NIR Observations
  53. GRB 171205A: Swift/UVOT Detection
  54. GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
  55. GRB 171205A: Enhanced Swift-XRT position
  56. GRB 171205A: Likely association with low-z spiral galaxy
  57. GRB 171205A: Swift detection of a burst
  58. GRB 171126A: AstroSat CZTI detection
  59. GRB 171124A: TShAO optical observations
  60. GRB 171124A: Swift-XRT afterglow detection
  61. GRB 171124A: Insight-HXMT/HE detection
  62. GRB 171126A: Fermi GBM detection
  63. GRB 171123A: TShAO optical upper limit
  64. GRB 171124A: AstroSat CZTI detection
  65. GRB 171123A: OSN Upper Limit
  66. GRB 171124A: Swift-XRT observations
  67. GRB 171124A: Fermi GBM observation
  68. GRB 171119A: AstroSat CZTI detection
  69. GRB 171123A: Tautenburg observations
  70. GRB 171123A: Nanshan-1m optical upper limit
  71. GRB 171123A: RATIR Optical and NIR Observations
  72. GRB 171124A: MITSuME Akeno optical upper limits
  73. GRB 171123A: Swift/UVOT Upper Limits
  74. GRB 171123A: GMG observation limit
  75. GRB 171124A: Fermi-LAT detection
  76. GRB 171124A: Swift ToO observations
  77. GRB 171123A: MITSuME Akeno optical upper limits
  78. GRB 171123A: Swift-BAT refined analysis
  79. GRB 171123A: Swift-XRT refined Analysis
  80. GRB 171123A: Confirmation of the X-ray afterglow
  81. GRB 171123A: Enhanced Swift-XRT position
  82. GRB 171120A: Insight-HXMT detection
  83. GRB 171123A: Swift detection of a burst
  84. Konus-Wind observation of GRB 171119A
  85. IPN Triangulation of GRB 171119A (long)
  86. GRB 171120A: Xinglong-2.16m optical upper limit
  87. GRB 171120A: Swift/UVOT Upper Limits
  88. GRB 171120A: AstroSat CZTI detection
  89. Konus-Wind observation of GRB 171120A
  90. GRB171120A: GWAC-F60A upper limit
  91. GRB 171120A: MITSuME Akeno optical upper limits
  92. GRB 171120A: Swift-BAT refined analysis
  93. GRB 171120A: Fermi GBM Detection
  94. GRB 171120A: Swift-XRT refined Analysis
  95. GRB 171120A: Fermi-LAT detection
  96. GRB 171120A: Enhanced Swift-XRT position
  97. GRB 171115B: Insight-HXMT detection
  98. GRB 171120A: Swift detection of a burst
  99. GRB 171108B: Insight-HXMT detection
  100. GRB 171115A: RATIR Optical and NIR Observations

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