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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"

37729 results found.

  1. GRB 171123A: Confirmation of the X-ray afterglow
  2. GRB 171123A: Enhanced Swift-XRT position
  3. GRB 171120A: Insight-HXMT detection
  4. GRB 171123A: Swift detection of a burst
  5. Konus-Wind observation of GRB 171119A
  6. IPN Triangulation of GRB 171119A (long)
  7. GRB 171120A: Xinglong-2.16m optical upper limit
  8. GRB 171120A: Swift/UVOT Upper Limits
  9. GRB 171120A: AstroSat CZTI detection
  10. Konus-Wind observation of GRB 171120A
  11. GRB171120A: GWAC-F60A upper limit
  12. GRB 171120A: MITSuME Akeno optical upper limits
  13. GRB 171120A: Swift-BAT refined analysis
  14. GRB 171120A: Fermi GBM Detection
  15. GRB 171120A: Swift-XRT refined Analysis
  16. GRB 171120A: Fermi-LAT detection
  17. GRB 171120A: Enhanced Swift-XRT position
  18. GRB 171115B: Insight-HXMT detection
  19. GRB 171120A: Swift detection of a burst
  20. Fermi-LAT Gamma-ray Observations of IceCube-171106A
  21. GRB 171108B: Insight-HXMT detection
  22. GRB 171115A: RATIR Optical and NIR Observations
  23. GRB 171115A: MITSuME Okayama optical upper limits
  24. GRB 171115A: MITSuME Akeno optical upper limits
  25. GRB 171115A: Swift-BAT refined analysis
  26. GRB 171115A: Swift-XRT refined Analysis
  27. GRB 171115A: Enhanced Swift-XRT position
  28. GRB 171115A: Swift detection of a burst
  29. GRB 171112A: Fermi GBM Detection
  30. Konus-Wind observation of GRB 171112A
  31. Konus-Wind observation of GRB 171108A
  32. GRB 171112A: MAXI/GSC detection
  33. IPN Triangulation of GRB 171108A (short)
  34. GRB 171103A: Insight-HXMT observation
  35. GRB 171010A: afterglow and SN 2017htp optical observations
  36. GRB 171108A: Fermi GBM detection
  37. GRB 171102A CALET Gamma-Ray Burst Monitor detection
  38. GRB 171101A CALET Gamma-Ray Burst Monitor detection
  39. INTEGRAL observation of IceCube-171106A
  40. GRB 171030A: MASTER OT J034412.48-263556.5 featureless continuum spectrum from Lijiang 2.4m (China) telescope and 2m the Himalayan Chandra
  41. GRB 171010A: possible SN component
  42. Fermi-GBM Trigger 531686417 / 171106778 is not related to ICECUBE-171106A
  43. IceCube-171106A - IceCube observation of a high-energy neutrino candidate
  44. AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
  45. GRB 171103A: AstroSat CZTI detection
  46. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  47. Konus-Wind observation of GRB 171103A (short/hard)
  48. GRB 171103A: Fermi GBM observation
  49. GRB 171103A: Swift-BAT refined analysis of a short GRB
  50. Fermi GBM detections of Swift J0243.6+6124 and modification of the GBM trigger configuration
  51. GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
  52. GRB 171103A: Swift detection of a short hard burst
  53. Konus-Wind observation of GRB 171102A
  54. GRB 171102B: AbAO optical upper limit
  55. GRB 171102B: TShAO optical upper limit
  56. IPN Triangulation of GRB 171102A
  57. GRB 171102B: Nanshan 0.36m and 0.60m optical upper limits
  58. GRB 171102B: RATIR Optical and NIR Observations
  59. GRB 171102B: Swift-BAT refined analysis
  60. GRB 171102B: MITSuME Akeno optical upper limits
  61. GRB 171102B: Swift/UVOT Upper Limits
  62. GRB 171102B: Swift-XRT refined Analysis
  63. GRB 171102B: Enhanced Swift-XRT position
  64. GRB 171102A: Fermi GBM detection
  65. GRB 171102B: Swift detection of a burst
  66. GRB 171102A: Fermi-LAT detection
  67. GRB 171030A: IPN error box through NSs probability merging rate map
  68. GRB 171030A: Fermi GBM detection
  69. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  70. GRB 171030A: Swift ToO observations
  71. IPN Triangulation of GRB 171030A (short)
  72. Fermi-GBM triggers due to Swift J0243.6+6124
  73. Swift Trigger 783893: KAIT Optical Observations
  74. GRB 171027A: KAIT Optical Upper Limit
  75. GRB 171022A: Fermi-LAT detection retraction
  76. Konus-Wind observation of GRB 171027A
  77. AMI-LA observations of the new Be X-ray binary Swift J0243.6+6124
  78. Swift Trigger 783893 is probably not a GRB
  79. GRB 171027A, Swift-BAT refined analysis
  80. GRB 171027A: Swift/UVOT Upper Limits
  81. GRB 171027A: Swift-XRT refined Analysis
  82. GRB 171027A: Enhanced Swift-XRT position
  83. GRB 171027A: RATIR Confirmation of Fading and Photo-z
  84. GRB 171027A: VLT optical upper limits
  85. GRB 171027A: LCO 1-m telescope observations
  86. GROND observations of GRB 171027A: correction
  87. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
  88. GROND observations of GRB 171027A
  89. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  90. GRB 171027A: Prompt enhanced Swift-XRT position
  91. GRB 171027A: Swift detection of a burst
  92. Konus-Wind observation of GRB 171022A
  93. IPN Triangulation of GRB 171022A
  94. GRB 171013B CALET Gamma-Ray Burst Monitor detection
  95. Fermi GBM trigger 530617076/171025401 is not a GRB
  96. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  97. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  98. GRB 171022A: Fermi GBM detection
  99. GRB 171022A: Fermi-LAT detection
  100. Fermi GBM Observations of IceCube-171015A

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