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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

8481 results found.

  1. GRB 080210: TAROT La Silla observatory optical detection
  2. GRB080207: RTT150 Optical Observations
  3. GRB 080207: REM NIR observations
  4. GRB 080207: Swift detection of a burst
  5. GRB 080205: Swift detection of a burst
  6. GRB 080130: REM NIR observations
  7. GRB 080129: KAIT optical limits
  8. GRB 080129: Gemini-South photometry
  9. GRB 080129: Gemini-South Imaging Observations
  10. GRB 080129 (?): UVOT Upper Limits
  11. GRB 080121: Upper limit on X-ray afterglow
  12. GRB 080123, Swift-BAT refined analysis
  13. GRB 080123: Swift detection of a short burst
  14. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  15. XRF 080109 / SN 2008D: WSRT Radio Detection
  16. Opticall follow-ups for the X-ray transient in NGC 2770
  17. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  18. GRB 071227: optical afterglow
  19. GRB 071227: Magellan redshift confirmation
  20. GRB 071227: VLT probable redshift of the candidate host galaxy
  21. GRB071227: Swift/UVOT refined analysis
  22. GRB 071227: REM NIR and Optical observations
  23. GRB 071227: Swift detection of a burst
  24. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  25. Disregard the "GRB 071126" position
  26. GRB071104: NIR Afterglow Candidate at TNG
  27. GRB 071122: MASTER optical observation
  28. GRB 071122: Corrected P60 Coordinates
  29. GRB 071122: P60 Optical Afterglow Candidate
  30. GRB 071122: Swift detection of a burst
  31. Konus-Wind and Konus-A observations of GRB 071117
  32. GRB 071117: TAROT La Silla observatory optical observations
  33. GRB 071118: Swift detection of a burst
  34. GRB 071117, Swift-BAT refined analysis
  35. GRB 071117: Initial Swift/UVOT observations
  36. Swift detection of MXB 0656-072
  37. GRB 071112C: WSRT Radio Observations
  38. GRB 071112B: Gemini Optical Imaging
  39. GRB 071112C: Swift detection of a burst with an optical counterpart
  40. GRB 071112: Swift detection of a possible burst
  41. GRB071109: Super-LOTIS observations
  42. GRB 071109: further Swift-XRT analysis
  43. GRB 071104: Possible Swift UVOT Afterglow Candidate
  44. GRB071101: Optical and NIR upper limits by KANATA
  45. GRB 071101: Swift detection of a burst
  46. GRB 071031: REM NIR and Optical observation
  47. GRB 071031: Swift detection of a burst with an optical counterpart
  48. GRB 071028: SARA observations of variable source
  49. GRB 071028, Swift-BAT refined analysis
  50. GRB 071028: Swift detection of a burst
  51. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  52. GRB 071025: Swift detection of a burst
  53. GRB 071021: R-band detection and analysis
  54. GRB071021: Optical+NIR observations
  55. GRB 071021: Subaru NIR observation
  56. GRB 071021: retraction of Faulkes Telescope South candidate
  57. GRB 071021: Swift-XRT Team refined analysis
  58. GRB 071021 : Lulin R-band limit
  59. GRB 071021: Faulkes Telescope South optical candidate
  60. GRB 071018: SARA observations
  61. GRB 071010B: Suzaku WAM observation of the prompt emission
  62. GRB 071013: 3rd TLS Epoch - constraints on variability
  63. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  64. GRB 071013: Optical observations
  65. GRB 071013: optical observations at NOT
  66. GRB071013: optical limit
  67. GRB 071011, Optical afterglow
  68. GRB 071011: Confirmation of P60 optical afterglow
  69. GRB 071011: P60 Optical Afterglow Candidate
  70. GRB 071011: MARGE Optical Limits
  71. GRB 071011: XRT afterglow detection
  72. GRB 071011: Early Super-LOTIS Observations
  73. GRB 071011: Optical afterglow candidate
  74. Optical Observation: GRB 071010
  75. Optical observations: GRB 071010A
  76. GRB 071010 REM NIR observations
  77. GRB 071003: VLT spectroscopy
  78. GRB 071003 Optical observations
  79. GRB 071003: P60 Confirmation of Optical Afterglow
  80. GRB 070920B: NOT optical observations
  81. GRB070917: Confirmation of optical afterglow
  82. Swift Status and XRT Calibration Uncertainties
  83. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  84. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  85. IPN search for a GRB associated with TAROT transient on August 31
  86. Intense burst from SGR 1806-20 detected on September 7
  87. GRB 070809: Confirmation of optical transient
  88. Observations of possible TAROT GRB transient near IC 4779
  89. Candidate Orphan GRB Optical Transient in IC 4779
  90. GRB 070810b: Image Subtraction of Multiple Keck Observations
  91. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  92. GRB 070731: Swift/UVOT Upper Limit
  93. GRB 070805: UVOT afterglow candidate retraction
  94. GRB070810b: optical candidate
  95. GRB 070810B, Swift-BAT refined analysis
  96. GRB 070810: MASTER optical observation
  97. Swift Alert 070810.8: MASTER optical observation
  98. GRB 070810B: Swift detection of a short burst
  99. GRB 070810: Swift detection of a burst
  100. GRB 070808: Swift detection of a burst

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