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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"

27277 results found.

  1. GRB 171209A: Swift/UVOT Analysis of the burst
  2. Swift trigger 796115 is not astrophysical
  3. GRB 171209A: Swift-XRT refined Analysis
  4. Swift Trigger 796115 is probably not a GRB
  5. GRB 171209A: Swift detection of a burst
  6. Swift Trigger 796098 is probably a noise peak near M31
  7. GRB 171124A CALET Gamma-Ray Burst Monitor detection
  8. GRB 171120A CALET Gamma-Ray Burst Monitor detection
  9. GRB 171106A CALET Gamma-Ray Burst Monitor detection
  10. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  11. Fermi GBM trigger 534174346/171205573 is not a GRB
  12. GRB 171205A: GROND observations of the optical/NIR transient
  13. GRB 171205A: GMG observations (2nd night)
  14. GRB 171205A: Host galaxy photometric properties
  15. Possible blackbody component in the X-ray spectrum of GRB171205A
  16. GRB 171205A: GOTO detection of the optical counterpart
  17. GRB 171205A: GMG observation
  18. Fermi Gamma-ray Burst Monitor trigger 534174346/171205573 is not a GRB
  19. GRB 171205A: Swift-BAT refined analysis
  20. GRB 171205A: Swift-XRT refined Analysis
  21. GRB 171205A: RATIR Optical and NIR Observations
  22. GRB 171205A: Swift/UVOT Detection
  23. GRB 171205A: Likely association with low-z spiral galaxy
  24. GRB 171205A: Swift detection of a burst
  25. LIGO/Virgo G299232: LOFAR follow-up
  26. GRB 171124A: Insight-HXMT/HE detection
  27. GRB 171126A: Fermi GBM detection
  28. GRB 171124A: AstroSat CZTI detection
  29. INTEGRAL pointed follow-up of IceCube-171106A
  30. GRB 171123A: OSN Upper Limit
  31. GRB 171124A: Fermi GBM observation
  32. GRB 171123A: Nanshan-1m optical upper limit
  33. GRB 171123A: RATIR Optical and NIR Observations
  34. GRB 171123A: Swift/UVOT Upper Limits
  35. GRB 171123A: GMG observation limit
  36. GRB 171124A: Fermi-LAT detection
  37. GRB 171123A: Swift-BAT refined analysis
  38. GRB 171123A: Swift-XRT refined Analysis
  39. GRB 171120A: Insight-HXMT detection
  40. GRB 171123A: Swift detection of a burst
  41. IPN Triangulation of GRB 171119A (long)
  42. GRB 171120A: Xinglong-2.16m optical upper limit
  43. GRB 171120A: Swift/UVOT Upper Limits
  44. GRB 171120A: AstroSat CZTI detection
  45. GRB 171120A: Swift-BAT refined analysis
  46. GRB 171120A: Fermi GBM Detection
  47. GRB 171120A: Swift-XRT refined Analysis
  48. GRB 171120A: Fermi-LAT detection
  49. GRB 171115B: Insight-HXMT detection
  50. GRB 171120A: Swift detection of a burst
  51. GRB 171108B: Insight-HXMT detection
  52. GRB 171115A: RATIR Optical and NIR Observations
  53. GRB 171115A: Swift-BAT refined analysis
  54. GRB 171115A: Swift-XRT refined Analysis
  55. GRB 171115A: Swift detection of a burst
  56. GRB 171112A: Fermi GBM Detection
  57. Konus-Wind observation of GRB 171108A
  58. IPN Triangulation of GRB 171108A (short)
  59. GRB 171103A: Insight-HXMT observation
  60. IceCube-171106A: Swift Observations
  61. GRB 171108A: Fermi GBM detection
  62. GRB 171102A CALET Gamma-Ray Burst Monitor detection
  63. GRB 171101A CALET Gamma-Ray Burst Monitor detection
  64. Fermi-GBM Trigger 531686417 / 171106778 is not related to ICECUBE-171106A
  65. IceCube-171106A - IceCube observation of a high-energy neutrino candidate
  66. AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
  67. GRB 171103A: Fermi GBM observation
  68. GRB 171103A: Swift-BAT refined analysis of a short GRB
  69. Fermi GBM detections of Swift J0243.6+6124 and modification of the GBM trigger configuration
  70. GRB 171103A: Swift detection of a short hard burst
  71. IPN Triangulation of GRB 171102A
  72. GRB 171102B: RATIR Optical and NIR Observations
  73. GRB 171102B: Swift-BAT refined analysis
  74. GRB 171102B: Swift/UVOT Upper Limits
  75. GRB 171102B: Swift-XRT refined Analysis
  76. GRB 171102A: Fermi GBM detection
  77. GRB 171102B: Swift detection of a burst
  78. GRB 171102A: Fermi-LAT detection
  79. GRB 171030A: Fermi GBM detection
  80. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  81. IPN Triangulation of GRB 171030A (short)
  82. Fermi-GBM triggers due to Swift J0243.6+6124
  83. Swift Trigger 783893: KAIT Optical Observations
  84. Konus-Wind observation of GRB 171027A
  85. Swift Trigger 783893: LCO 1-m telescope observations
  86. Swift Trigger 783893 is probably not a GRB
  87. GRB 171027A, Swift-BAT refined analysis
  88. GRB 171027A: Swift/UVOT Upper Limits
  89. GRB 171027A: Swift-XRT refined Analysis
  90. GRB 171027A: RATIR Confirmation of Fading and Photo-z
  91. GRB 171027A: VLT optical upper limits
  92. GRB 171027A: LCO 1-m telescope observations
  93. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
  94. GROND observations of GRB 171027A
  95. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  96. GRB 171027A: Swift detection of a burst
  97. IPN Triangulation of GRB 171022A
  98. GRB 171013B CALET Gamma-Ray Burst Monitor detection
  99. Fermi GBM trigger 530617076/171025401 is not a GRB
  100. Swift trigger 781740: Further analysis from Swift and Fermi/GBM

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