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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"

21263 results found.

  1. GRB 090715A: Suzaku WAM observation of the prompt emission
  2. GRB 090709A - CARMA mm Observations
  3. GRB 090715A: VLA observations
  4. Konus-Wind observations of short/hard GRB 090715A
  5. GRB 090715B: Swift/UVOT followup observations
  6. GRB 090715B: Enhanced Swift-XRT position
  7. GRB 090715B: Observation of the optical afterglow
  8. GRB 090715B: NOT optical observations
  9. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  10. GRB 090715A: ROTSE-III Optical Limits
  11. GRB 090713: Fermi GBM detection
  12. VLA radio observations of GRB 090709A
  13. GRB 090621B: MTM-500 optical observations
  14. GRB 090709A: Suzaku WAM observation of the prompt emission
  15. GRB 090709A: Swift UVOT upper limits
  16. GRB 090709A: WHT LIRIS observations
  17. Konus-Wind and Konus-RF observations of GRB 090709A
  18. GRB 090709A: P60 Observations
  19. GRB 090709A: NOT optical observations
  20. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  21. GRB 090709B, Swift-BAT refined analysis
  22. GRB 090709A: Swift-BAT refined analysis
  23. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  24. GRB 090709A, RIMOTS optical upper limits
  25. GRB 090709A: Enhanced Swift-XRT position
  26. GRB 090709A: Subaru NIR observation
  27. GRB 090709 : planned Suzaku-ToO observation
  28. GRB 090709: Faulkes Telescope North Upper Limits
  29. GRB 090626: Suzaku WAM observation of the prompt emission
  30. GRB 090709: PAIRITEL NIR Upper Limits
  31. GRB 090709: ROTSE-III Optical Limits
  32. GRB 090709: Swift detection of a bright burst
  33. GRB 090708: Early RAPTOR Optical Limits
  34. GRB 090708, Swift-BAT refined analysis
  35. GRB 090708: ROTSE-III Optical Limits
  36. GRB 090705: PAIRITEL NIR Observations
  37. GRB 090705: Swift detection of a possible burst
  38. XRF 090702 : RTT150 optical observations
  39. GRB 090529: CrAO optical upper limit
  40. GRB 090529: MTM-500 optical observations
  41. XRF 090702: Swift-XRT refined analysis
  42. GRB 090702: UVOT upper limits
  43. XRF 090702: VLT imaging
  44. XRF 090702: Swift-XRT afterglow position
  45. GRB 090404: Deep optical imaging and possible host association
  46. GRB 090628: Swift/UVOT Upper Limits
  47. Konus-Wind observation of GRB 090626
  48. GRB080628: SAO RAS optical observations
  49. GRB 090628: GROND upper limits
  50. GRB 090628: Enhanced Swift-XRT position
  51. GRB 090626: IPN localization
  52. GRB 090628: Swift detection of a burst
  53. GRB 090423: Spitzer observations of the z~8.3 burst
  54. GRB 090625B: Swift/UVOT Upper Limits
  55. GRB 090625B: GROND upper limits
  56. GRB 090623: Suzaku WAM observation of the prompt emission
  57. GRB090618: HCT optical observations
  58. GRB 090618: SARA Second Epoch Observations
  59. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  60. GRB 090617: Suzaku WAM observation of the prompt emission
  61. GRB 090618: Suzaku WAM observation of the prompt emission
  62. GRB 090621A: Enhanced Swift-XRT position
  63. GRB 090621B: GRT Optical Observation
  64. GRB 090621A: GRT Optical Observation
  65. GRB 090621B: I-band observations from 1.23m CAHA
  66. GRB 090621B: P60 Observations
  67. GRB 090621B: VLA observations
  68. Konus-Wind and Konus-RF observations of GRB 090618
  69. GRB 090621B: Swift/UVOT Upper Limits
  70. GRB 090621B: RTT150 optical observations
  71. GRB 090621B: Swift detection of a short hard burst
  72. GRB 090621: Swift/UVOT Upper Limits
  73. GRB090618: Spectrum and photometry from 6.0m BTA
  74. GRB 090621: Swift detection of a burst
  75. GRB090618: OAA-OAUV Optical observations
  76. VLA radio detection of GRB 090618
  77. GRB 090618 15GHz radio detection
  78. GRB090618 - Continued optical monitoring and light curve break
  79. GRB 090618: Swift-BAT refined analysis
  80. GRB 090618: SARA observations
  81. GRB090618: Swift/UVOT bright afterglow detection
  82. GRB 090618: SDSS host detection
  83. Swift XRT observations of GRB 090531A
  84. GRB 090618: AGILE observations
  85. GRB 090618: Enhanced Swift-XRT position
  86. GRB 090618 Faulkes Telescope North observations
  87. GRB090618: P60 Optical Afterglow
  88. GRB 090618: Swift detection of a bright burst with optical afterglow
  89. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  90. GRB 090602: Suzaku WAM observation of the prompt emission
  91. GRB 090424: WSRT Radio Observations
  92. RXTE Discovery of Pulsations from SGR 0418+5729
  93. Konus-RF observation of SGR burst 090605A
  94. Discovery of a new soft gamma repeater source, SGR 0418+5729
  95. GRB 090607: Swift/UVOT Upper Limits
  96. GRB 090607: GRAS001 optical observations
  97. GRB 090607: Faulkes Telescope North observations
  98. GRB 090607: Swift detection of a burst
  99. GRB 090530B: Suzaku WAM observation of the prompt emission
  100. GRB 090530: Further NOT optical observations

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