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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. VLA Radio upper limit on GRB 081118
  2. GRB 081118: VLT redshift
  3. GRB 081118: optical afterglow candidate
  4. GRB 081109A: confirmation of possible detection host galaxy
  5. GRB 081102: RTT150 Optical observations
  6. GRB 081110: MASTER: first optical observations Fermi GRB
  7. GRB 081109: TAROT La Silla observatory optical observations
  8. GRB 081102: MASTER refind and final results
  9. GRB 081109B: Swift/UVOT refined analysis
  10. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  11. GRB 081109A: Possible Swift-UVOT detection
  12. GRB 081109: Swift/UVOT upper limits
  13. GRB 081109A optical upper limit
  14. Swift-BAT Trigger 334129: possible burst
  15. GRB 081109: REM NIR afterglow detection
  16. GRB 081028 - PAIRITEL NIR detection
  17. GRB 081104: GROND found no Optical/NIR Afterglow
  18. UVOT/Swift observations of GRB081105
  19. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  20. GRB081104: Swift/UVOT Upper Limits
  21. GRB 081104 : Faulkes Telescope South observations
  22. GRB 081102: MASTER prompt optical limit
  23. GRB 081102: Swift/UVOT refined analysis
  24. GRB 081102: OPTIMA-Burst optical upper limit
  25. SGR 0501+4516: optical observations in August
  26. GRB 081024B: BTA deep optical observations
  27. GRB 081028: CrAO optical observations
  28. GRB 081024B: new Swift-XRT observations
  29. GRB 081029, SMARTS optical/IR afterglow observations
  30. GRB 081029: UVOT Detection of the Optical Afterglow
  31. GRB 081029: Redshift Confirmation from Gemini-South
  32. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  33. GRB 081029: REM observations
  34. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  35. GRB 081029: ROTSE-III Detection of Optical Counterpart
  36. GRB 081028: Magellan redshift
  37. GRB081028: UVOT detection of a brightening afterglow
  38. Swift UVOT observations of GRB081028
  39. GRB 081028: TAROT Calern observatory optical observations
  40. GRB 081028: optical observations at the NOT
  41. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  42. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  43. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  44. GRB081025: RTT150 optical observations
  45. Swift UVOT observations of GRB081025
  46. Swift UVOT observations of GRB081024B
  47. Swift UVOT observations of GRB 081024
  48. GRB 081024: Faulkes Telescope North optical observations
  49. GRB 081024: KAIT Optical Limits
  50. GRB 081024A: ROTSE-III Optical Limits
  51. GRB 081016B: Swift/UVOT Upper Limits
  52. GRB 081016B: ROTSE-III Optical Limits
  53. Swift-BAT triggered on the flare star Algol
  54. GRB 080430: optical observations
  55. GRB 081008 optical upper limit
  56. GRB 081012: Swift/UVOT analysis of initial observations
  57. GRB 081012: ROTSE-III Optical Limits
  58. GRB081011: UVOT detection of an optical afterglow
  59. GRB 081008, SMARTS optical/IR afterglow observations
  60. GRB 081007: Radio Detection
  61. GRB 081008: VLT redshift confirmation
  62. GRB 081008: Gemini-South Absorption Redshiftt
  63. GRB 081008: Swift detection of a burst with optical afterglow
  64. GRB 081008: ROTSE-III Detection of Optical Counterpart
  65. GRB 081007, SMARTS optical afterglow observations
  66. GRB 081007: Early RAPTOR measurements of optical counterpart
  67. GRB 081007: Gemini-south redshift
  68. GRB 081007, Faulkes Telescope North optical observations
  69. GRB 081007, SMARTS optical/IR afterglow observations
  70. GRB 081007: REM NIR and optical counterpart
  71. GRB 081007: Swift detection of a burst with optical afterglow
  72. GRB 081003B: TAROT Calern observatory optical observations
  73. GRB 081003A: OSN optical observations
  74. GRB081003B: Optical limits from Spain
  75. GRB081001: optical limit from ASH-Centurion
  76. GRB 080928: Watcher observations
  77. GRB080928: Gemini-South Absorption Redshift
  78. GRB 080928: Swift/UVOT observations
  79. GRB 080928: GROND DETECTION
  80. GRB 080928, Swift-BAT initial refined analysis
  81. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  82. GRB 080928: Swift detection of a burst with an optical counterpart
  83. GRB080922, optical upper limit
  84. GRB 080919: Swift/UVOT Refined Analysis
  85. GRB 080916C: IRSF/SIRUS NIR Observation
  86. GRB 080916C: GROND Confirmation of the Optical Afterglow
  87. GRB 080916C: GROND Confirmation of the Optical Afterglow
  88. GRB 080915A: GROND upper limits
  89. GRB 080916A: GROND lightcurve
  90. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  91. GRB 080915a, SMARTS optical/IR observations
  92. GRB 080916: Swift detection of a burst with optical afterglow
  93. GRB 080915: ROTSE-III Optical Limits
  94. GRB 080913: VLT/FORS spectrum
  95. GRB 080913: VLT/FORS2 observations
  96. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  97. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  98. GRB080905A: Swift/UVOT Upper Limits
  99. GRB 080905B: Watcher optical detection
  100. GRB 080905A: Enhanced Swift-XRT position

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