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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"

15983 results found.

  1. GRB 080319B: optical observations
  2. GRB 080319B: RAPTOR observations of a naked eye burst
  3. GRB 080319A: Swift-XRT Team Refined Analysis
  4. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  5. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  6. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  7. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  8. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  9. GRB 080319B: TORTORA synchronous observation
  10. GRB 080319B: REM early data
  11. VLT/UVES redshift of GRB 080319B
  12. GRB 080319C: Swift detection of a burst with an optical afterglow
  13. GRB 080319A: REM observations
  14. GRB 080319b prompt optical observation by Pi-of-the-Sky
  15. GRB 080319B: Gemini-South Spectroscopy
  16. GRB 080319A: optical observations at the NOT
  17. GRB0 080319B : LOAO optical observation
  18. GRB080319B Liverpool Telescope optical afterglow candidate
  19. GRB080319A: P60 Optical Afterglow Observations
  20. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  21. GRB080315: Bok Optical Observations
  22. GRB 080315: Optical observations
  23. GRB 080315: TAROT Calern observatory optical observations
  24. GRB080310 : Lulin Optical observations
  25. GRB080310, unusual slow decay in the optical
  26. GRB 080310: GAO 150cm telescope Optical Observation
  27. GRB080310 : Optical observations by LOAO and Lulin
  28. GRB 080310: ROTSE-III Observations of Optical Counterpart
  29. GRB080310: Optical observation by MITSuME telescope
  30. GRB080310, optical observations with the LBT
  31. GRB 080307: GAO 150cm telescope Optical Observation
  32. GRB 080229A: GAO 150cm telescope Optical Observation
  33. GRB080210: optical observations
  34. GRB080307: optical upper limit
  35. GRB 080310: Swift/UVOT Refined Analysis
  36. GRB080310 : Lulin optical observation
  37. GRB 080310: RRM optical photometry with the VLT
  38. GRB080310, detection of break in optical
  39. GRB 080310: VLT/UVES spectroscopy
  40. GRB080310, optical observations with LBT
  41. GRB 080310, SMARTS optical/IR afterglow observations
  42. GRB 080310: Magellan redshift
  43. GRB 080310: Swift detection of a burst with optical afterglow
  44. GRB080229, optical upper limit (Correction)
  45. GRB080307, optical upper limit
  46. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  47. GRB080229, optical upper limit
  48. GRB 080307: Early RAPTOR Limits
  49. GRB 080307: TNT optical observation
  50. GRB080307: Optical upper limits
  51. GRB 080307: retraction of UVOT candidate
  52. GRB 080307 : BOAO optical afterglow observation
  53. GRB 080307: Optical observation with DMC/KANATA
  54. Swift UVOT observations of GRB080229B
  55. GRB 080303A: Faulkes Telescope South optical afterglow observations
  56. GRB 080303: Swift detection of a burst with optical afterglow
  57. GRB 080303A: ROTSE-III Optical Limits
  58. GRB 080229: Deep Gemini/GMOS optical observations
  59. GRB080229: Possible optical afterglow
  60. GRB 080229: Faulkes Telescope South optical limit
  61. GRB 080229A: ROTSE-III Optical Limits
  62. Early optical shallow decay in GRB 071112C
  63. GRB080207: optical observations
  64. GRB080205: optical observations
  65. GRB080211: optical observations
  66. GRB 071010B : Early optical brightening detected by TAOS
  67. ESO optical and NIR observations of GRB 080218B
  68. GRB 080212: Mount Abu NIR observations
  69. GRB 080218b, SMARTS optical/IR limits
  70. GRB 080212: VLT optical rapid decay
  71. GRB 080212: REM refined analysis
  72. VLA radio upper limit on GRB 080212
  73. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  74. GRB 080212: Gemini-South optical observations
  75. GRB 080212: optical observations
  76. GRB 080210: Swift/UVOT Refined Analysis
  77. GRB 080207: optical observations.
  78. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  79. GRB 080210: VLT redshift
  80. GRB 080210: GOND detection in all bands and redshift upper limit
  81. GRB 080210: Swift detection of a burst with optical afterglow
  82. GRB 080210: TAROT La Silla observatory optical detection
  83. GRB 080205: GAO 150cm telescope Optical limit
  84. GRB 080207: Optical limits from Gemini-South
  85. GRB 080205: RTT150 optical observations
  86. GRB080207: RTT150 Optical Observations
  87. GRB 080207: REM NIR observations
  88. GRB 080207: TAROT Calern observatory optical observations
  89. GRB 080205 optical upper limit
  90. GRB 080205: MASTER optical observation
  91. GRB 080205: optical observation
  92. GRB 080205: OA evolution from KAIT observations
  93. GRB 080205: Swift/UVOT observations
  94. GRB 080129: Optical observations from OSN
  95. X-ray transient in NGC 2770: RTT150 optical observations
  96. GRB 080129: KAIT optical limits
  97. GRB 080129: optical limit by Pi of the Sky
  98. GRB 080129: TAROT La Silla observatory optical observations
  99. GRB 080129: Gemini-South photometry
  100. GRB 080129: GROND detection in all bands, and fading

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