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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"

8477 results found.

  1. GRB 080205: Swift detection of a burst
  2. GRB 080130: REM NIR observations
  3. GRB 080129: KAIT optical limits
  4. GRB 080129: Gemini-South photometry
  5. GRB 080129: Gemini-South Imaging Observations
  6. GRB 080129 (?): UVOT Upper Limits
  7. GRB 080121: Upper limit on X-ray afterglow
  8. GRB 080123, Swift-BAT refined analysis
  9. GRB 080123: Swift detection of a short burst
  10. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  11. XRF 080109 / SN 2008D: WSRT Radio Detection
  12. Opticall follow-ups for the X-ray transient in NGC 2770
  13. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  14. GRB 071227: optical afterglow
  15. GRB 071227: Magellan redshift confirmation
  16. GRB 071227: VLT probable redshift of the candidate host galaxy
  17. GRB071227: Swift/UVOT refined analysis
  18. GRB 071227: REM NIR and Optical observations
  19. GRB 071227: Swift detection of a burst
  20. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  21. Disregard the "GRB 071126" position
  22. GRB071104: NIR Afterglow Candidate at TNG
  23. GRB 071122: MASTER optical observation
  24. GRB 071122: Corrected P60 Coordinates
  25. GRB 071122: P60 Optical Afterglow Candidate
  26. GRB 071122: Swift detection of a burst
  27. Konus-Wind and Konus-A observations of GRB 071117
  28. GRB 071117: TAROT La Silla observatory optical observations
  29. GRB 071118: Swift detection of a burst
  30. GRB 071117, Swift-BAT refined analysis
  31. GRB 071117: Initial Swift/UVOT observations
  32. Swift detection of MXB 0656-072
  33. GRB 071112C: WSRT Radio Observations
  34. GRB 071112B: Gemini Optical Imaging
  35. GRB 071112C: Swift detection of a burst with an optical counterpart
  36. GRB 071112: Swift detection of a possible burst
  37. GRB071109: Super-LOTIS observations
  38. GRB 071109: further Swift-XRT analysis
  39. GRB 071104: Possible Swift UVOT Afterglow Candidate
  40. GRB071101: Optical and NIR upper limits by KANATA
  41. GRB 071101: Swift detection of a burst
  42. GRB 071031: REM NIR and Optical observation
  43. GRB 071031: Swift detection of a burst with an optical counterpart
  44. GRB 071028: SARA observations of variable source
  45. GRB 071028, Swift-BAT refined analysis
  46. GRB 071028: Swift detection of a burst
  47. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  48. GRB 071025: Swift detection of a burst
  49. GRB 071021: R-band detection and analysis
  50. GRB071021: Optical+NIR observations
  51. GRB 071021: Subaru NIR observation
  52. GRB 071021: retraction of Faulkes Telescope South candidate
  53. GRB 071021: Swift-XRT Team refined analysis
  54. GRB 071021 : Lulin R-band limit
  55. GRB 071021: Faulkes Telescope South optical candidate
  56. GRB 071018: SARA observations
  57. GRB 071010B: Suzaku WAM observation of the prompt emission
  58. GRB 071013: 3rd TLS Epoch - constraints on variability
  59. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  60. GRB 071013: Optical observations
  61. GRB 071013: optical observations at NOT
  62. GRB071013: optical limit
  63. GRB 071011, Optical afterglow
  64. GRB 071011: Confirmation of P60 optical afterglow
  65. GRB 071011: P60 Optical Afterglow Candidate
  66. GRB 071011: MARGE Optical Limits
  67. GRB 071011: XRT afterglow detection
  68. GRB 071011: Early Super-LOTIS Observations
  69. GRB 071011: Optical afterglow candidate
  70. Optical Observation: GRB 071010
  71. Optical observations: GRB 071010A
  72. GRB 071010 REM NIR observations
  73. GRB 071003: VLT spectroscopy
  74. GRB 071003 Optical observations
  75. GRB 071003: P60 Confirmation of Optical Afterglow
  76. GRB 070920B: NOT optical observations
  77. GRB070917: Confirmation of optical afterglow
  78. Swift Status and XRT Calibration Uncertainties
  79. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  80. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  81. IPN search for a GRB associated with TAROT transient on August 31
  82. Intense burst from SGR 1806-20 detected on September 7
  83. GRB 070809: Confirmation of optical transient
  84. Observations of possible TAROT GRB transient near IC 4779
  85. Candidate Orphan GRB Optical Transient in IC 4779
  86. GRB 070810b: Image Subtraction of Multiple Keck Observations
  87. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  88. GRB 070731: Swift/UVOT Upper Limit
  89. GRB 070805: UVOT afterglow candidate retraction
  90. GRB070810b: optical candidate
  91. GRB 070810B, Swift-BAT refined analysis
  92. GRB 070810: MASTER optical observation
  93. Swift Alert 070810.8: MASTER optical observation
  94. GRB 070810B: Swift detection of a short burst
  95. GRB 070810: Swift detection of a burst
  96. GRB 070808: Swift detection of a burst
  97. GRB070805 XRT and UVOT afterglow candidate
  98. GRB 070805, Swift-BAT refined analysis
  99. GRB 070805: Swift/UVOT initial analysis
  100. Swift detection of a outburst from SAX J1810.8-2609

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