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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"

15739 results found.

  1. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  2. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  3. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  4. GRB 080319B: TORTORA synchronous observation
  5. GRB 080319B: REM early data
  6. VLT/UVES redshift of GRB 080319B
  7. GRB 080319C: Swift detection of a burst with an optical afterglow
  8. GRB 080319A: REM observations
  9. GRB 080319b prompt optical observation by Pi-of-the-Sky
  10. GRB 080319B: Gemini-South Spectroscopy
  11. GRB 080319A: optical observations at the NOT
  12. GRB0 080319B : LOAO optical observation
  13. GRB080319B Liverpool Telescope optical afterglow candidate
  14. GRB080319A: P60 Optical Afterglow Observations
  15. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  16. GRB080315: Bok Optical Observations
  17. GRB 080315: Optical observations
  18. GRB 080315: TAROT Calern observatory optical observations
  19. GRB080310 : Lulin Optical observations
  20. GRB080310, unusual slow decay in the optical
  21. GRB 080310: GAO 150cm telescope Optical Observation
  22. GRB080310 : Optical observations by LOAO and Lulin
  23. GRB 080310: ROTSE-III Observations of Optical Counterpart
  24. GRB080310: Optical observation by MITSuME telescope
  25. GRB080310, optical observations with the LBT
  26. GRB 080307: GAO 150cm telescope Optical Observation
  27. GRB 080229A: GAO 150cm telescope Optical Observation
  28. GRB080210: optical observations
  29. GRB080307: optical upper limit
  30. GRB 080310: Swift/UVOT Refined Analysis
  31. GRB080310 : Lulin optical observation
  32. GRB 080310: RRM optical photometry with the VLT
  33. GRB080310, detection of break in optical
  34. GRB 080310: VLT/UVES spectroscopy
  35. GRB080310, optical observations with LBT
  36. GRB 080310, SMARTS optical/IR afterglow observations
  37. GRB 080310: Magellan redshift
  38. GRB 080310: Swift detection of a burst with optical afterglow
  39. GRB080229, optical upper limit (Correction)
  40. GRB080307, optical upper limit
  41. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  42. GRB080229, optical upper limit
  43. GRB 080307: Early RAPTOR Limits
  44. GRB 080307: TNT optical observation
  45. GRB080307: Optical upper limits
  46. GRB 080307: retraction of UVOT candidate
  47. GRB 080307, Preliminary Swift-BAT refined analysis
  48. GRB 080307 : BOAO optical afterglow observation
  49. GRB 080307: Optical observation with DMC/KANATA
  50. Swift UVOT observations of GRB080229B
  51. GRB 080303A: Faulkes Telescope South optical afterglow observations
  52. GRB 080303: Swift detection of a burst with optical afterglow
  53. GRB 080303A: ROTSE-III Optical Limits
  54. GRB 080229: Deep Gemini/GMOS optical observations
  55. GRB080229: Possible optical afterglow
  56. GRB 080229: Faulkes Telescope South optical limit
  57. GRB 080229A: ROTSE-III Optical Limits
  58. Early optical shallow decay in GRB 071112C
  59. GRB080207: optical observations
  60. GRB080205: optical observations
  61. GRB080211: optical observations
  62. GRB 071010B : Early optical brightening detected by TAOS
  63. ESO optical and NIR observations of GRB 080218B
  64. GRB 080218b, SMARTS optical/IR limits
  65. GRB 080212: VLT optical rapid decay
  66. GRB 080212: REM refined analysis
  67. VLA radio upper limit on GRB 080212
  68. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  69. GRB 080212: Gemini-South optical observations
  70. GRB 080212: optical observations
  71. GRB 080210: Swift/UVOT Refined Analysis
  72. GRB 080207: optical observations.
  73. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  74. GRB 080210: VLT redshift
  75. GRB 080210: GOND detection in all bands and redshift upper limit
  76. GRB 080210: Swift detection of a burst with optical afterglow
  77. GRB 080210: TAROT La Silla observatory optical detection
  78. GRB 080205: GAO 150cm telescope Optical limit
  79. GRB 080207: Optical limits from Gemini-South
  80. GRB 080205: RTT150 optical observations
  81. GRB080207: RTT150 Optical Observations
  82. GRB 080207: REM NIR observations
  83. GRB 080207: TAROT Calern observatory optical observations
  84. GRB 080205 optical upper limit
  85. GRB 080205: MASTER optical observation
  86. GRB 080205: optical observation
  87. GRB 080205: Swift XRT refined analysis
  88. GRB 080205: OA evolution from KAIT observations
  89. GRB 080205: Swift/UVOT observations
  90. GRB 080129: Optical observations from OSN
  91. X-ray transient in NGC 2770: RTT150 optical observations
  92. GRB 080129: KAIT optical limits
  93. GRB 080129: optical limit by Pi of the Sky
  94. GRB 080129: TAROT La Silla observatory optical observations
  95. GRB 080129: Gemini-South photometry
  96. GRB 080129: GROND detection in all bands, and fading
  97. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  98. GRB 080129: Gemini-South Imaging Observations
  99. Transient 080109/SN 2008D: Spectroscopic Evolution
  100. SNe 2008D and 2007uy: Chandra Detections

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