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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"

43964 results found.

  1. GRB 171209A: MASTER-Net optical observations
  2. GRB 171211A: Enhanced Swift-XRT position
  3. GRB 171210A: Swift-XRT and UVOT observations
  4. GRB 171211A: Swift detection of a possibly short burst
  5. GRB 171210A: Fermi GBM detection
  6. GRB 171210A: Swift ToO observations
  7. Correction to GCN 22184: GRB 171205A: Swift-BAT refined analysis
  8. GRB 171209A: Swift-BAT refined analysis
  9. GRB 171210A: Fermi-LAT detection
  10. Konus-Wind observation of GRB 171205A
  11. GRB 171205A: MASTER-Net OT recent photometry
  12. GRB 171205A: iTelescope optical observations
  13. GRB 171205A: Mondy optical observations
  14. GRB 171205A: SAO-RAS optical observations
  15. GMRT upper limit on GRB 171205A
  16. GRB 171209A: Swift/UVOT Analysis of the burst
  17. Swift trigger 796115 is not astrophysical
  18. GRB 171209A: Swift-XRT refined Analysis
  19. GRB 171209A: Enhanced Swift-XRT position
  20. Swift Trigger 796115 is probably not a GRB
  21. GRB 171205A: VLA detection
  22. GRB 171205A: UKIRT near-IR observations
  23. GRB 171209A: LCO 1-m telescope observations
  24. GRB 171209A: Swift detection of a burst
  25. Swift Trigger 796098 is probably a noise peak near M31
  26. LIGO/Virgo GW170817: X-ray observations confirm prediction made from radio data
  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. LIGO/Virgo GW170817: Further Hubble Space Telescope observations
  31. LIGO/Virgo G298048: Brightening X-ray Emission from GW170817/GRB170817A/SSS17a
  32. GRB 171205A: TSHAO optical observations
  33. GRB 171205A: Detection of the emerging SN
  34. LIGO/Virgo GW170817: Chandra X-ray brightening of the counterpart 108 days since merger
  35. GRB 171205A: Continued Swift/UVOT Observations
  36. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  37. Fermi GBM trigger 534174346/171205573 is not a GRB
  38. GRB 171205A: MASTER-SAAO optical observations of unusual OT
  39. GRB 171205A: GROND observations of the optical/NIR transient
  40. GRB 171205A: LCO 1-m telescope observations
  41. GRB171205A hyperluminal radio afterglow?
  42. GRB 171205A: GMG observations (2nd night)
  43. GRB 171205A: Host galaxy photometric properties
  44. GRB 171205A: CHILESCOPE optical observations
  45. GRB 171205A: SMARTS optical/IR afterglow observations
  46. Possible blackbody component in the X-ray spectrum of GRB171205A
  47. GRB 171205A: GOTO detection of the optical counterpart
  48. GRB 171205A: TNG NIR detections
  49. GRB 171205A: LSGT optical afterglow follow-up observation
  50. GRB 171205A: NOEMA detection of a bright mm afterglow
  51. GRB 171205A: GMG observation
  52. Fermi Gamma-ray Burst Monitor trigger 534174346/171205573 is not a GRB
  53. GRB 171205A: Swift-BAT refined analysis
  54. GRB 171205A: Swift-XRT refined Analysis
  55. GRB 171205A: RATIR Optical and NIR Observations
  56. GRB 171205A: Swift/UVOT Detection
  57. GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
  58. GRB 171205A: Enhanced Swift-XRT position
  59. GRB 171205A: Likely association with low-z spiral galaxy
  60. GRB 171205A: Swift detection of a burst
  61. GRB 171126A: AstroSat CZTI detection
  62. GRB 171124A: TShAO optical observations
  63. GRB 171124A: Swift-XRT afterglow detection
  64. Pan-STARRS follow-up of IceCube-171106A
  65. LIGO/Virgo G299232: LOFAR follow-up
  66. GRB 171124A: Insight-HXMT/HE detection
  67. GRB 171126A: Fermi GBM detection
  68. GRB 171123A: TShAO optical upper limit
  69. GRB 171124A: AstroSat CZTI detection
  70. INTEGRAL pointed follow-up of IceCube-171106A
  71. GRB 171123A: OSN Upper Limit
  72. GRB 171124A: Swift-XRT observations
  73. GRB 171124A: Fermi GBM observation
  74. GRB 171119A: AstroSat CZTI detection
  75. GRB 171123A: Tautenburg observations
  76. GRB 171123A: Nanshan-1m optical upper limit
  77. GRB 171123A: RATIR Optical and NIR Observations
  78. GRB 171123A: Swift/UVOT Upper Limits
  79. GRB 171123A: GMG observation limit
  80. GRB 171124A: Fermi-LAT detection
  81. GRB 171124A: Swift ToO observations
  82. GRB 171123A: MITSuME Akeno optical upper limits
  83. GRB 171123A: Swift-BAT refined analysis
  84. GRB 171123A: Swift-XRT refined Analysis
  85. GRB 171123A: Confirmation of the X-ray afterglow
  86. GRB 171123A: Enhanced Swift-XRT position
  87. GRB 171120A: Insight-HXMT detection
  88. GRB 171123A: Swift detection of a burst
  89. Konus-Wind observation of GRB 171119A
  90. IPN Triangulation of GRB 171119A (long)
  91. GRB 171120A: Swift/UVOT Upper Limits
  92. GRB 171120A: AstroSat CZTI detection
  93. Konus-Wind observation of GRB 171120A
  94. GRB 171120A: MITSuME Akeno optical upper limits
  95. GRB 171120A: Swift-BAT refined analysis
  96. GRB 171120A: Fermi GBM Detection
  97. GRB 171120A: Swift-XRT refined Analysis
  98. GRB 171120A: Fermi-LAT detection
  99. GRB 171120A: Enhanced Swift-XRT position
  100. GRB 171115B: Insight-HXMT detection

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