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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"

27272 results found.

  1. Swift Trigger 796098 is probably a noise peak near M31
  2. GRB 171124A CALET Gamma-Ray Burst Monitor detection
  3. GRB 171120A CALET Gamma-Ray Burst Monitor detection
  4. GRB 171106A CALET Gamma-Ray Burst Monitor detection
  5. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  6. Fermi GBM trigger 534174346/171205573 is not a GRB
  7. GRB 171205A: GROND observations of the optical/NIR transient
  8. GRB 171205A: GMG observations (2nd night)
  9. GRB 171205A: Host galaxy photometric properties
  10. Possible blackbody component in the X-ray spectrum of GRB171205A
  11. GRB 171205A: GOTO detection of the optical counterpart
  12. GRB 171205A: GMG observation
  13. Fermi Gamma-ray Burst Monitor trigger 534174346/171205573 is not a GRB
  14. GRB 171205A: Swift-BAT refined analysis
  15. GRB 171205A: Swift-XRT refined Analysis
  16. GRB 171205A: RATIR Optical and NIR Observations
  17. GRB 171205A: Swift/UVOT Detection
  18. GRB 171205A: Likely association with low-z spiral galaxy
  19. GRB 171205A: Swift detection of a burst
  20. LIGO/Virgo G299232: LOFAR follow-up
  21. GRB 171124A: Insight-HXMT/HE detection
  22. GRB 171126A: Fermi GBM detection
  23. GRB 171124A: AstroSat CZTI detection
  24. INTEGRAL pointed follow-up of IceCube-171106A
  25. GRB 171123A: OSN Upper Limit
  26. GRB 171124A: Fermi GBM observation
  27. GRB 171123A: Nanshan-1m optical upper limit
  28. GRB 171123A: RATIR Optical and NIR Observations
  29. GRB 171123A: Swift/UVOT Upper Limits
  30. GRB 171123A: GMG observation limit
  31. GRB 171124A: Fermi-LAT detection
  32. GRB 171123A: Swift-BAT refined analysis
  33. GRB 171123A: Swift-XRT refined Analysis
  34. GRB 171120A: Insight-HXMT detection
  35. GRB 171123A: Swift detection of a burst
  36. IPN Triangulation of GRB 171119A (long)
  37. GRB 171120A: Xinglong-2.16m optical upper limit
  38. GRB 171120A: Swift/UVOT Upper Limits
  39. GRB 171120A: AstroSat CZTI detection
  40. GRB 171120A: Swift-BAT refined analysis
  41. GRB 171120A: Fermi GBM Detection
  42. GRB 171120A: Swift-XRT refined Analysis
  43. GRB 171120A: Fermi-LAT detection
  44. GRB 171115B: Insight-HXMT detection
  45. GRB 171120A: Swift detection of a burst
  46. GRB 171108B: Insight-HXMT detection
  47. GRB 171115A: RATIR Optical and NIR Observations
  48. GRB 171115A: Swift-BAT refined analysis
  49. GRB 171115A: Swift-XRT refined Analysis
  50. GRB 171115A: Swift detection of a burst
  51. GRB 171112A: Fermi GBM Detection
  52. Konus-Wind observation of GRB 171108A
  53. IPN Triangulation of GRB 171108A (short)
  54. GRB 171103A: Insight-HXMT observation
  55. IceCube-171106A: Swift Observations
  56. GRB 171108A: Fermi GBM detection
  57. GRB 171102A CALET Gamma-Ray Burst Monitor detection
  58. GRB 171101A CALET Gamma-Ray Burst Monitor detection
  59. Fermi-GBM Trigger 531686417 / 171106778 is not related to ICECUBE-171106A
  60. IceCube-171106A - IceCube observation of a high-energy neutrino candidate
  61. AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
  62. GRB 171103A: Fermi GBM observation
  63. GRB 171103A: Swift-BAT refined analysis of a short GRB
  64. Fermi GBM detections of Swift J0243.6+6124 and modification of the GBM trigger configuration
  65. GRB 171103A: Swift detection of a short hard burst
  66. IPN Triangulation of GRB 171102A
  67. GRB 171102B: RATIR Optical and NIR Observations
  68. GRB 171102B: Swift-BAT refined analysis
  69. GRB 171102B: Swift/UVOT Upper Limits
  70. GRB 171102B: Swift-XRT refined Analysis
  71. GRB 171102A: Fermi GBM detection
  72. GRB 171102B: Swift detection of a burst
  73. GRB 171102A: Fermi-LAT detection
  74. GRB 171030A: Fermi GBM detection
  75. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  76. IPN Triangulation of GRB 171030A (short)
  77. Fermi-GBM triggers due to Swift J0243.6+6124
  78. Swift Trigger 783893: KAIT Optical Observations
  79. Konus-Wind observation of GRB 171027A
  80. Swift Trigger 783893: LCO 1-m telescope observations
  81. Swift Trigger 783893 is probably not a GRB
  82. GRB 171027A, Swift-BAT refined analysis
  83. GRB 171027A: Swift/UVOT Upper Limits
  84. GRB 171027A: Swift-XRT refined Analysis
  85. GRB 171027A: RATIR Confirmation of Fading and Photo-z
  86. GRB 171027A: VLT optical upper limits
  87. GRB 171027A: LCO 1-m telescope observations
  88. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
  89. GROND observations of GRB 171027A
  90. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  91. GRB 171027A: Swift detection of a burst
  92. IPN Triangulation of GRB 171022A
  93. GRB 171013B CALET Gamma-Ray Burst Monitor detection
  94. Fermi GBM trigger 530617076/171025401 is not a GRB
  95. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  96. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  97. GRB 171022A: Fermi GBM detection
  98. GRB 171022A: Fermi-LAT detection
  99. Swift Trigger 781740 is not a burst
  100. Fermi GBM Observations of IceCube-171015A

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