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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"

19565 results found.

  1. GRB 080507: Optical Afterglow
  2. GRB 080506:Optical observations from HCT
  3. GRB 080506: VLA radio upper limit
  4. GRB080506: Swift/UVOT observations
  5. GRB080503, RIMOTS optical upper limit
  6. GRB 080506: Observations from NOT
  7. GRB 080506: Enhanced Swift-XRT position
  8. GRB 080506: Swift detection of a burst with optical afterglow
  9. GRB 080503: VLA radio upper limit
  10. GRB 080503: Observations from NOT
  11. GRB 080430: TLS imaging one day after the GRB
  12. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  13. GRB 080503, Swift-BAT refined analysis
  14. GRB 080430
  15. GRB 080503: Enhanced Swift-XRT position
  16. GRB 080503: New candidate afterglow/host in Gemini imaging
  17. GRB 080503: Swift detection of a short burst
  18. GRB 080411: Continued Swift Monitoring
  19. GRB080430: Swift/UVOT observations
  20. VLA radio upper limit on GRB 080430
  21. GRB 080430: Enhanced Swift-XRT position
  22. GRB 080430 - SDSS Pre-Burst Observations
  23. GRB 080430: Bootes observation
  24. GRB 080430: Swift detection of a burst with optical afterglow
  25. GRB 080430: TAROT Calern observatory optical observations
  26. GRB080426: Swift/UVOT upper limits
  27. GRB 080426: Enhanced Swift-XRT position
  28. GRB 080426: Swift detection of a possibly short burst
  29. GRB 080320 : Faulkes Telescope North Observations
  30. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  31. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  32. GRB 080420?: Swift detection of a possible short burst
  33. GRB080310, BVRcIc field calibration
  34. Swift XRT and UVOT observations of GRB080414
  35. GRB 080413B: Faulkes Telescope South optical afterglow observations
  36. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  37. GRB 080413B: Suzaku WAM observation of the prompt emission
  38. GRB 080414: RTT150 optical observations
  39. VLA radio observations of GRB 080413B
  40. VLA radio observations of GRB 080413A
  41. GRB080413B
  42. GRB 080413a, SMARTS optical/IR afterglow observations
  43. GRB080413A: Swift/UVOT observations
  44. GRB080413B: REM NIR & Optical Observation
  45. GRB 080413B: GROND detection of afterglow in all bands
  46. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  47. GRB 080413A: REM detection of the NIR Afterglow
  48. GRB 080413: Enhanced Swift-XRT position
  49. GRB 080413: TAROT Calern observatory optical observations
  50. GRB 080413: Swift detection of a burst with an optical afterglow
  51. GRB 080411: Swift/UVOT refined analysis
  52. GRB 080411: Swift-XRT Refined Analysis
  53. GRB 080411: Enhanced Swift-XRT position
  54. GRB 080411: GROND detection of optical afterglow candidate
  55. GRB 080411: Swift detection of a bright burst
  56. GRB 080408: GROND detection of optical/NIR afterglow candidate
  57. GRB 080330 optical observations
  58. Swift/UVOT observations of GRB080409
  59. GRB 080409: Enhanced Swift-XRT position
  60. GRB 080409: REM optical/NIR observations
  61. GRB 080409: Swift detection of a burst
  62. GRB 080319A: Early RAPTOR optical limits
  63. GRB 080319B: HST observations
  64. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  65. GRB 080405: Swift-BAT refined analysis
  66. GRB 080405: Swift-XRT position
  67. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  68. GRB 080325: optical upper limit
  69. GRB 080328: GAO 150cm telescope Optical Observation
  70. GRB080330: Improved Swift XRT Position
  71. GRB 080330: Prompt PROMPT Observations
  72. GRB080330: optical observations
  73. GRB080328, RIMOTS optical upper limit
  74. GRB 080330: REM optical observations
  75. GRB 080330 Swift-UVOT refined analysis
  76. GRB080330: TNT optical observations
  77. GRB 080330: GROND Observations
  78. GRB 080330A: PAIRITEL Infrared Detections
  79. GRB 080330: error in reported XRT position
  80. GRB080330 - SDSS Pre-Burst Observations
  81. GRB 080330: Swift detection of a burst with an optical counterpart
  82. GRB 080330: TAROT Calern observatory optical detection
  83. Swift/UVOT observations of GRB080328
  84. GRB080319B, BVRcIc field calibration
  85. GRB 080328: Enhanced Swift-XRT position
  86. GRB 080328: Swift detection of a burst with an optical counterpart
  87. GRB 080325: Subaru detection of NIR afterglow candidate
  88. GRB080325: XRT Refined Analysis
  89. GRB 080325: GROND Observations
  90. GRB 080325: Swift/UVOT Upper Limits
  91. GRB 080325: Early observations from OSN
  92. GRB 080325: NIR afterglow candidate
  93. GRB 080319D: GROND Detection of the Optical Counterpart
  94. GRB 080325: Enhanced Swift-XRT position
  95. GRB 080325: Swift detection of a burst
  96. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  97. GRB 080319B: Spitzer Mid-infrared Observations
  98. Radio Detection of GRB 080319B
  99. GRB 080319D: GROND Observations
  100. GRB 080319B: optical upper limit

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