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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"

16161 results found.

  1. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  2. GRB 080928: Swift detection of a burst with an optical counterpart
  3. GRB080922, optical upper limit
  4. GRB 080919: Swift/UVOT Refined Analysis
  5. GRB 080916C: IRSF/SIRUS NIR Observation
  6. GRB 080916C: GROND Confirmation of the Optical Afterglow
  7. GRB 080916C: GROND Confirmation of the Optical Afterglow
  8. GRB 080915A: GROND upper limits
  9. GRB 080916A: GROND lightcurve
  10. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  11. GRB 080915a, SMARTS optical/IR observations
  12. GRB 080916: Swift detection of a burst with optical afterglow
  13. GRB 080915: ROTSE-III Optical Limits
  14. GRB 080913: VLT/FORS spectrum
  15. GRB 080913: VLT/FORS2 observations
  16. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  17. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  18. GRB080905A: Swift/UVOT Upper Limits
  19. GRB 080905B: Watcher optical detection
  20. GRB 080905A: Enhanced Swift-XRT position
  21. GRB 080905A: MITSuME Akeno optical upper limits
  22. GRB 080906: Refined Swift/UVOT Observations
  23. GRB 080905A: optical afterglow
  24. GRB 080906: GROND observations of the optical/NIR afterglow
  25. GRB 080905B: Refined UVOT Analysis
  26. GRB 080906: Swift detection of a burst with optical afterglow
  27. GRB 080905B: Swift detection of a burst with possible optical counterpart
  28. GRB 080905: R & I-band optical observations
  29. GRB 080903: Swift/UVOT Observations
  30. GRB 080903: optical observations
  31. GRB 080903: Liverpool Telescope observations
  32. GRB 080903: Astrotel-Caucasus optical observations
  33. GRB 080903: Optical afterglow candidate
  34. GRB 080903: TAROT Calern observatory optical observations
  35. GRB 080903: ROTSE-III Optical Limits
  36. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  37. SGR 0501+4516: Confirmation of the NIR counterpart
  38. SGR 0501+4516: Detection of possible optical counterpart
  39. GRB080825B: Swift/UVOT Upper Limits
  40. GRB 080825B: Swift-XRT team analysis
  41. GRB080825: Afterglow confirmation and redshift estimate
  42. GRB 080825B - optical counterpart candidate
  43. SGR 0501+4516: MDM Optical Observations
  44. SGR 0501+4516: Astrotel-Caucasus optical observations
  45. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  46. GRB 080822B: MASTER optical observation
  47. SGR 0501+4516: optical observations
  48. GRB 080822 (SGR 0501+4516): archival optical observations
  49. GRB080810 - optical observations
  50. GRB080810: optical observations
  51. GRB 080810: RTT150 optical observations
  52. GRB 080810: Liverpool and Faulkes North observations
  53. GRB 080810: RTT150 optical observations
  54. GRB080810: MITSuME optical observation
  55. GRB 080810: Swift/UVOT Refined Analysis
  56. GRB 080810: optical observations
  57. GRB 080810: Liverpool Telescope observations
  58. GRB 080810: D50 optical observation
  59. GRB 080810: Kanazawa optical observation
  60. GRB 080810: Observations from NOT
  61. GRB 080810: RTT150 optical observations
  62. GRB 080810: KANATA optical-NIR observation, update
  63. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  64. GRB 080810 : optical observation with KANATA
  65. GRB 080810: Swift detection of a burst with a bright optical afterglow
  66. GRB 080805: Faulkes Telescope South optical observations
  67. GRB 080804: GROND observations
  68. GRB 080727B: Late VLT imaging
  69. GRB 080804: ATCA Radio Observations
  70. GRB 080804: Swift/UVOT Refined Analysis
  71. GRB080804: Gemini South redshift confirmation
  72. GRB 080804: Faulkes Telescope South observations
  73. GRB080805 optical limit by "Pi of the Sky"
  74. GRB 080805: VLT redshift
  75. GRB 080805: GROND detection of possible afterglow
  76. GRB 080804: Swift detection of a burst with optical afterglow
  77. GRB 080804: ROTSE-III Detection of Optical Counterpart
  78. GRB 080727B: IR photometry
  79. GRB 080727A: Early IR observations
  80. GRB 080727C: TAROT Calern observatory optical observations
  81. GRB 080727B: KAIT photometry and an early lightcurve break
  82. GRB 080727B: REM NIR afterglow prompt detection
  83. GRB080727C: RTT150 optical observations
  84. Swift detection of XTE J1701-407
  85. GRB 080727A: Swift-XRT refined analysis
  86. GRB 080727B: KAIT observations
  87. GRB 080723A: optical upper limit
  88. GRB 080721 : Lulin 2nd optical follow-ups
  89. GRB 080721: OA fading and redshift
  90. GRB 080721: UVOT Follow-Up Observations
  91. GRB 080721 : Lulin Optical follow-ups
  92. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  93. GRB 080714: GROND confirmation of the optical/NIR afterglow
  94. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  95. GRB 080702A: optical upper limit
  96. GRB 080603A: CrAO optical observations
  97. GRB 080603B: optical observations in MAO
  98. GRB 080603B: optical observations in CrAO
  99. GRB 080710: Optical observation with MITSuME Okayama
  100. GRB 080710: TLS observations, steepening afterglow decay

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