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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20494 results found.

  1. GRB 090807: Swift detection of a burst
  2. IPN Triangulation and Konus-Wind observaions of GRB090727B
  3. GRB 090726: optical observation
  4. Swift trigger 358760 is probably a noise event
  5. GRB 090717A: Suzaku WAM observation of the prompt emission
  6. GRB 090727: GRT Optical Observation
  7. GRB 090726: GRT Optical Observation
  8. GRB 090727: Swift/UVOT Upper Limits
  9. GRB 090728: Swift/UVOT Upper Limits
  10. GRB 090728: Enhanced Swift-XRT position
  11. GRB 090728, RIMOTS optical upper limits
  12. GRB 090728: Swift detection of a burst
  13. GRB 090727: Swift-BAT refined analysis
  14. GRB 090727: Enhanced Swift-XRT position
  15. GRB 090715B: Late-time Lick 3m observations
  16. GRB 090727: Swift detection of a burst
  17. GRB090726: Swift/UVOT observations
  18. GRB 090726, Swift-BAT refined analysis
  19. GRB 090726: Enhanced Swift-XRT position
  20. GRB 090726: optical transient candidate
  21. Konus-Wind and Konus-RF observations of GRB 090719
  22. Konus-RF and Konus-Wind observations of GRB 090718B
  23. Konus-Wind observations of bright hard GRB 090720B
  24. GRB 090720B: Fermi GBM detection
  25. Swift XRT and UVOT refned analysis of GRB 090720
  26. GRB 090715B: VLA radio detection
  27. GRB 090720 Source found in ground processing of Swift-BAT data
  28. GRB 090717: Fermi GBM detection
  29. GRB 090719: Fermi GBM detection
  30. GRB 090718B: Fermi GBM detection
  31. GRB 090715B: further NOT optical observations
  32. GRB 090715A: Suzaku WAM observation of the prompt emission
  33. GRB 090709A - CARMA mm Observations
  34. GRB 090715A: VLA observations
  35. Konus-Wind observations of short/hard GRB 090715A
  36. GRB 090715B: Swift/UVOT followup observations
  37. GRB 090715B: Enhanced Swift-XRT position
  38. GRB 090715B: Observation of the optical afterglow
  39. GRB 090715B: NOT optical observations
  40. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  41. GRB 090715A: ROTSE-III Optical Limits
  42. GRB 090713: Fermi GBM detection
  43. VLA radio observations of GRB 090709A
  44. GRB 090621B: MTM-500 optical observations
  45. GRB 090709A: Suzaku WAM observation of the prompt emission
  46. GRB 090709A: Swift UVOT upper limits
  47. GRB 090709A: WHT LIRIS observations
  48. Konus-Wind and Konus-RF observations of GRB 090709A
  49. GRB 090709A: P60 Observations
  50. GRB 090709A: NOT optical observations
  51. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  52. GRB 090709B, Swift-BAT refined analysis
  53. GRB 090709A: Swift-BAT refined analysis
  54. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  55. GRB 090709A, RIMOTS optical upper limits
  56. GRB 090709A: Enhanced Swift-XRT position
  57. GRB 090709A: Subaru NIR observation
  58. GRB 090709 : planned Suzaku-ToO observation
  59. GRB 090709: Faulkes Telescope North Upper Limits
  60. GRB 090626: Suzaku WAM observation of the prompt emission
  61. GRB 090709: PAIRITEL NIR Upper Limits
  62. GRB 090709: ROTSE-III Optical Limits
  63. GRB 090709: Swift detection of a bright burst
  64. GRB 090708: Early RAPTOR Optical Limits
  65. GRB 090708, Swift-BAT refined analysis
  66. GRB 090708: ROTSE-III Optical Limits
  67. GRB 090705: PAIRITEL NIR Observations
  68. GRB 090705: Swift detection of a possible burst
  69. XRF 090702 : RTT150 optical observations
  70. GRB 090529: CrAO optical upper limit
  71. GRB 090529: MTM-500 optical observations
  72. XRF 090702: Swift-XRT refined analysis
  73. GRB 090702: UVOT upper limits
  74. XRF 090702: VLT imaging
  75. XRF 090702: Swift-XRT afterglow position
  76. GRB 090404: Deep optical imaging and possible host association
  77. GRB 090628: Swift/UVOT Upper Limits
  78. Konus-Wind observation of GRB 090626
  79. GRB080628: SAO RAS optical observations
  80. GRB 090628: GROND upper limits
  81. GRB 090628: Enhanced Swift-XRT position
  82. GRB 090626: IPN localization
  83. GRB 090628: Swift detection of a burst
  84. GRB 090423: Spitzer observations of the z~8.3 burst
  85. GRB 090625B: Swift/UVOT Upper Limits
  86. GRB 090625B: GROND upper limits
  87. GRB 090623: Suzaku WAM observation of the prompt emission
  88. GRB090618: HCT optical observations
  89. GRB 090618: SARA Second Epoch Observations
  90. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  91. GRB 090617: Suzaku WAM observation of the prompt emission
  92. GRB 090618: Suzaku WAM observation of the prompt emission
  93. GRB 090621A: Enhanced Swift-XRT position
  94. GRB 090621B: GRT Optical Observation
  95. GRB 090621A: GRT Optical Observation
  96. GRB 090621B: I-band observations from 1.23m CAHA
  97. GRB 090621B: P60 Observations
  98. GRB 090621B: VLA observations
  99. Konus-Wind and Konus-RF observations of GRB 090618
  100. GRB 090621B: Swift/UVOT Upper Limits

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