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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"

15556 results found.

  1. GRB080413B
  2. GRB 080413a, SMARTS optical/IR afterglow observations
  3. GRB 080413A Bootes observation
  4. GRB080413B: REM NIR & Optical Observation
  5. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  6. GRB 080413A: REM detection of the NIR Afterglow
  7. GRB 080413: TAROT Calern observatory optical observations
  8. GRB 080413: Swift detection of a burst with an optical afterglow
  9. GRB 080413: ROTSE-III Detection of Optical Counterpart
  10. GRB 080411: Swift/UVOT refined analysis
  11. GRB 080411: VLT redshift
  12. GRB 080411: GROND detection of optical afterglow candidate
  13. GRB 080330: Swift-XRT refined position retraction
  14. GRB 080408: GROND detection of optical/NIR afterglow candidate
  15. GRB 080330 optical observations
  16. Swift/UVOT observations of GRB080409
  17. UVOT/Swift Observations of GRB080408
  18. GRB 080409: REM optical/NIR observations
  19. GRB 080319A: Early RAPTOR optical limits
  20. GRB 080319B: HST observations
  21. GRB 080330: RAPTOR detection of prompt optical flash
  22. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  23. GRB 080325: optical upper limit
  24. GRB 080328: GAO 150cm telescope Optical Observation
  25. GRB080330: optical observations
  26. GRB 080319B: TORTORA light curve (Correction)
  27. GRB080328, RIMOTS optical upper limit
  28. GRB080330: optical observations
  29. GRB 080330: REM optical observations
  30. GRB 080330, SMARTS optical/IR afterglow observations
  31. GRB080330: TNT optical observations
  32. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  33. GRB 080330: GROND Observations
  34. GRB 080330: NOT redshift
  35. GRB 080330: TAROT Calern observatory optical observations
  36. GRB 080330: error in reported XRT position
  37. GRB 080330: Liverpool Telescope Optical observations
  38. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  39. GRB 080330: Swift detection of a burst with an optical counterpart
  40. GRB 080330: TAROT Calern observatory optical detection
  41. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  42. GRB 080328: BTA optical imaging and spectroscopy
  43. GRB080325 - I and z-band Imaging
  44. GRB080319B, BVRcIc field calibration
  45. GRB080328: Faulkes Telescope North observations
  46. GRB 080328: Swift detection of a burst with an optical counterpart
  47. GRB 080325: MITSuME Akeno optical upper limits
  48. GRB080319B: optical observations
  49. GRB 080325: Swift/UVOT Upper Limits
  50. GRB 080319D: GROND Detection of the Optical Counterpart
  51. GRB 080319B: Spitzer Mid-infrared Observations
  52. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  53. Radio Detection of GRB 080319B
  54. GRB 080319B: Optical observation (Brno, CZ)
  55. GRB 080319B: TORTORA light curve
  56. GRB 080319B: optical upper limit
  57. GRB 080319D: optical upper limit
  58. GRB 080319C: UVOT Observations
  59. GRB 080319B: UVOT Observations
  60. GRB 080319A: UVOT Observations
  61. GRB 080319B - CARMA mm Observations
  62. GRB 080320: optical limit
  63. GRB 080320: Gemini-N optical afterglow
  64. GRB 080319B: Gemini-South photometry
  65. GRB 080319B optical observations
  66. GRB 080319B: WSRT Radio Observations
  67. GRB 080320: SDSS source and Gemini-N observations
  68. GRB 080320: optical limit from IAC80
  69. GRB 080319C: Early RAPTOR Observations
  70. GRB 080319C: KAIT OA observations
  71. GRB 080320: ROTSE-III Optical Limits
  72. GRB 080319B : Lulin observation of temporal break at 0.2 days
  73. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  74. GRB 080319B: optical observations
  75. GRB 080319B: RAPTOR observations of a naked eye burst
  76. GRB 080319A: Swift-XRT Team Refined Analysis
  77. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  78. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  79. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  80. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  81. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  82. GRB 080319B: TORTORA synchronous observation
  83. GRB 080319B: REM early data
  84. VLT/UVES redshift of GRB 080319B
  85. GRB 080319C: Swift detection of a burst with an optical afterglow
  86. GRB 080319A: REM observations
  87. GRB 080319b prompt optical observation by Pi-of-the-Sky
  88. GRB 080319B: Gemini-South Spectroscopy
  89. GRB 080319A: optical observations at the NOT
  90. GRB0 080319B : LOAO optical observation
  91. GRB080319B Liverpool Telescope optical afterglow candidate
  92. GRB080319A: P60 Optical Afterglow Observations
  93. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  94. GRB080315: Bok Optical Observations
  95. GRB 080315: Optical observations
  96. GRB 080315: TAROT Calern observatory optical observations
  97. GRB080310 : Lulin Optical observations
  98. GRB080310, unusual slow decay in the optical
  99. GRB 080310: GAO 150cm telescope Optical Observation
  100. GRB080310 : Optical observations by LOAO and Lulin

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