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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"

15987 results found.

  1. GRB080922, optical upper limit
  2. GRB 080919: Swift/UVOT Refined Analysis
  3. GRB 080916C: IRSF/SIRUS NIR Observation
  4. GRB 080916C: GROND Confirmation of the Optical Afterglow
  5. GRB 080916C: GROND Confirmation of the Optical Afterglow
  6. GRB 080916A: GROND lightcurve
  7. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  8. GRB 080915a, SMARTS optical/IR observations
  9. GRB 080916: Swift detection of a burst with optical afterglow
  10. GRB 080915: ROTSE-III Optical Limits
  11. GRB 080913: VLT/FORS2 observations
  12. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  13. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  14. GRB080905A: Swift/UVOT Upper Limits
  15. GRB 080905B: Watcher optical detection
  16. GRB 080905A: Enhanced Swift-XRT position
  17. GRB 080905A: MITSuME Akeno optical upper limits
  18. GRB 080906: Refined Swift/UVOT Observations
  19. GRB 080905A: optical afterglow
  20. GRB 080906: GROND observations of the optical/NIR afterglow
  21. GRB 080905B: Refined UVOT Analysis
  22. GRB 080906: Swift detection of a burst with optical afterglow
  23. GRB 080905B: Swift detection of a burst with possible optical counterpart
  24. GRB 080905: R & I-band optical observations
  25. GRB 080903: Swift/UVOT Observations
  26. GRB 080903: optical observations
  27. GRB 080903: Liverpool Telescope observations
  28. GRB 080903: Astrotel-Caucasus optical observations
  29. GRB 080903: Optical afterglow candidate
  30. GRB 080903: TAROT Calern observatory optical observations
  31. GRB 080903: ROTSE-III Optical Limits
  32. SGR 0501+4516: Confirmation of the NIR counterpart
  33. SGR 0501+4516: Detection of possible optical counterpart
  34. GRB080825B: Swift/UVOT Upper Limits
  35. GRB 080825B: Swift-XRT team analysis
  36. GRB080825: Afterglow confirmation and redshift estimate
  37. GRB 080825B - optical counterpart candidate
  38. SGR 0501+4516: MDM Optical Observations
  39. SGR 0501+4516: Astrotel-Caucasus optical observations
  40. GRB 080822B: MASTER optical observation
  41. SGR 0501+4516: optical observations
  42. GRB 080822 (SGR 0501+4516): archival optical observations
  43. GRB080810 - optical observations
  44. GRB080810: optical observations
  45. GRB 080810: RTT150 optical observations
  46. GRB 080810: Liverpool and Faulkes North observations
  47. GRB 080810: RTT150 optical observations
  48. GRB080810: MITSuME optical observation
  49. GRB 080810: Swift/UVOT Refined Analysis
  50. GRB 080810: optical observations
  51. GRB 080810: Liverpool Telescope observations
  52. GRB 080810: D50 optical observation
  53. GRB 080810: Kanazawa optical observation
  54. GRB 080810: Observations from NOT
  55. GRB 080810: RTT150 optical observations
  56. GRB 080810: KANATA optical-NIR observation, update
  57. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  58. GRB 080810 : optical observation with KANATA
  59. GRB 080810: Swift detection of a burst with a bright optical afterglow
  60. GRB 080805: Faulkes Telescope South optical observations
  61. GRB 080804: GROND observations
  62. GRB 080727B: Late VLT imaging
  63. GRB 080804: ATCA Radio Observations
  64. GRB 080804: Swift/UVOT Refined Analysis
  65. GRB080804: Gemini South redshift confirmation
  66. GRB 080804: Faulkes Telescope South observations
  67. GRB080805 optical limit by "Pi of the Sky"
  68. GRB 080805: VLT redshift
  69. GRB 080805: GROND detection of possible afterglow
  70. GRB 080804: Swift detection of a burst with optical afterglow
  71. GRB 080804: ROTSE-III Detection of Optical Counterpart
  72. GRB 080727B: IR photometry
  73. GRB 080727A: Early IR observations
  74. GRB 080727C: TAROT Calern observatory optical observations
  75. GRB 080727B: KAIT photometry and an early lightcurve break
  76. GRB 080727B: REM NIR afterglow prompt detection
  77. GRB080727C: RTT150 optical observations
  78. Swift detection of XTE J1701-407
  79. GRB 080727B: KAIT observations
  80. GRB 080723A: optical upper limit
  81. GRB 080721 : Lulin 2nd optical follow-ups
  82. GRB 080721: OA fading and redshift
  83. GRB 080721: UVOT Follow-Up Observations
  84. GRB 080721 : Lulin Optical follow-ups
  85. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  86. GRB 080714: GROND confirmation of the optical/NIR afterglow
  87. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  88. GRB 080702A: optical upper limit
  89. GRB 080603A: CrAO optical observations
  90. GRB 080603B: optical observations in MAO
  91. GRB 080603B: optical observations in CrAO
  92. GRB 080710: Optical observation with MITSuME Okayama
  93. GRB 080710: TLS observations, steepening afterglow decay
  94. GRB 0800707: optical observations
  95. GRB 080710: Gemini spectroscopy and probable redshift
  96. GRB 080710: REM afterglow confirmation & brightening
  97. GRB 080710: KAIT OA candidate
  98. GRB 080707: possible break in the X-rays
  99. GRB 080707: GROND Confirmation of the Optical Afterglow
  100. GRB 080707: Swift XRT refined analysis

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