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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"

15741 results found.

  1. GRB 080905A: MITSuME Akeno optical upper limits
  2. GRB 080906: Refined Swift/UVOT Observations
  3. GRB 080905A: optical afterglow
  4. GRB 080906: GROND observations of the optical/NIR afterglow
  5. GRB 080905B: Refined UVOT Analysis
  6. GRB 080906: Swift detection of a burst with optical afterglow
  7. GRB 080905B: Swift detection of a burst with possible optical counterpart
  8. GRB 080905: R & I-band optical observations
  9. GRB 080903: Swift/UVOT Observations
  10. GRB 080903: optical observations
  11. GRB 080903: Liverpool Telescope observations
  12. GRB 080903: Astrotel-Caucasus optical observations
  13. GRB 080903: Optical afterglow candidate
  14. GRB 080903: TAROT Calern observatory optical observations
  15. GRB 080903: ROTSE-III Optical Limits
  16. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  17. SGR 0501+4516: Confirmation of the NIR counterpart
  18. SGR 0501+4516: Detection of possible optical counterpart
  19. GRB080825B: Swift/UVOT Upper Limits
  20. GRB 080825B: Swift-XRT team analysis
  21. GRB080825: Afterglow confirmation and redshift estimate
  22. GRB 080825B - optical counterpart candidate
  23. SGR 0501+4516: MDM Optical Observations
  24. SGR 0501+4516: Astrotel-Caucasus optical observations
  25. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  26. GRB 080822B: MASTER optical observation
  27. SGR 0501+4516: optical observations
  28. GRB 080822 (SGR 0501+4516): archival optical observations
  29. GRB080810 - optical observations
  30. GRB080810: optical observations
  31. GRB 080810: RTT150 optical observations
  32. GRB 080810: Liverpool and Faulkes North observations
  33. GRB 080810: RTT150 optical observations
  34. GRB080810: MITSuME optical observation
  35. GRB 080810: Swift/UVOT Refined Analysis
  36. GRB 080810: optical observations
  37. GRB 080810: Liverpool Telescope observations
  38. GRB 080810: D50 optical observation
  39. GRB 080810: Kanazawa optical observation
  40. GRB 080810: Observations from NOT
  41. GRB 080810: RTT150 optical observations
  42. GRB 080810: KANATA optical-NIR observation, update
  43. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  44. GRB 080810 : optical observation with KANATA
  45. GRB 080810: Swift detection of a burst with a bright optical afterglow
  46. GRB 080805: Faulkes Telescope South optical observations
  47. GRB 080804: GROND observations
  48. GRB 080727B: Late VLT imaging
  49. GRB 080804: ATCA Radio Observations
  50. GRB 080804: Swift/UVOT Refined Analysis
  51. GRB080804: Gemini South redshift confirmation
  52. GRB 080804: Faulkes Telescope South observations
  53. GRB080805 optical limit by "Pi of the Sky"
  54. GRB 080805: VLT redshift
  55. GRB 080805: GROND detection of possible afterglow
  56. GRB 080804: Swift detection of a burst with optical afterglow
  57. GRB 080804: ROTSE-III Detection of Optical Counterpart
  58. GRB 080727B: IR photometry
  59. GRB 080727A: Early IR observations
  60. GRB 080727C: TAROT Calern observatory optical observations
  61. GRB 080727B: KAIT photometry and an early lightcurve break
  62. GRB 080727B: REM NIR afterglow prompt detection
  63. GRB080727C: RTT150 optical observations
  64. Swift detection of XTE J1701-407
  65. GRB 080727A: Swift-XRT refined analysis
  66. GRB 080727B: KAIT observations
  67. GRB 080723A: optical upper limit
  68. GRB 080721 : Lulin 2nd optical follow-ups
  69. GRB 080721: OA fading and redshift
  70. GRB 080721: UVOT Follow-Up Observations
  71. GRB 080721 : Lulin Optical follow-ups
  72. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  73. GRB 080714: GROND confirmation of the optical/NIR afterglow
  74. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  75. GRB 080702A: optical upper limit
  76. GRB 080603A: CrAO optical observations
  77. GRB 080603B: optical observations in MAO
  78. GRB 080603B: optical observations in CrAO
  79. GRB 080710: Optical observation with MITSuME Okayama
  80. GRB 080710: TLS observations, steepening afterglow decay
  81. GRB 0800707: optical observations
  82. GRB 080710: Gemini spectroscopy and probable redshift
  83. GRB 080710: REM afterglow confirmation & brightening
  84. GRB 080710: KAIT OA candidate
  85. GRB 080707: possible break in the X-rays
  86. GRB 080707: GROND Confirmation of the Optical Afterglow
  87. GRB 080707: Swift XRT refined analysis
  88. GRB 080707: VLT redshift
  89. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  90. Trigger 316063: Swift detection of a transient
  91. GRB 080702B: GROND Upper Limits
  92. GRB 080703: UVOT Follow-Up Observation
  93. GRB 080703: VLT observations of the afterglow
  94. GRB 080703: Swift detection of a burst with optical afterglow
  95. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  96. GRB 080702b: LCO optical observations
  97. GRB 080702B: Swift XRT and UVOT observations
  98. GRB 080702A: MITSuME Akeno optical upper limits
  99. GRB 080701A: Early RAPTOR optical limits
  100. Swift Trigger 315630: Swift/UVOT Upper Limits

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