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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"
  1. GRB 080320: optical limit
  2. GRB 080320: Gemini-N optical afterglow
  3. Konus-Wind observation of GRB 080319C
  4. GRB 080319B: Gemini-South photometry
  5. GRB 080319B: Allen Telescope Array Observations
  6. GRB 080319B optical observations
  7. GRB 080319C, Swift-BAT refined analysis
  8. Konus-Wind observation of GRB 080319B
  9. GRB 080319B: WSRT Radio Observations
  10. GRB 080320: SDSS source and Gemini-N observations
  11. GRB 080320: Enhanced Swift-XRT position
  12. GRB 080320: optical limit from IAC80
  13. GRB 080319C: Early RAPTOR Observations
  14. GRB 080319B: second epoch imaging from Canarias (correction to GCN7469)
  15. GRB 080319C: KAIT OA observations
  16. GRB 080320 - SDSS Pre-Burst Observations
  17. GRB 080320: Swift detection of a burst
  18. GRB 080320: ROTSE-III Optical Limits
  19. GRB 080319B : Lulin observation of temporal break at 0.2 days
  20. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  21. GRB 080319B: optical observations
  22. GRB 080319C - SDSS Pre-Burst Observations
  23. GRB 080319A SDSS Pre-Burst Observations
  24. Swift-BAT trigger 306829 is IGR J16479-4514
  25. GRB080319B - SDSS Pre-Burst Observations
  26. GRB 080319B: RAPTOR observations of a naked eye burst
  27. GRB 080319A: Swift-XRT Team Refined Analysis
  28. GRB 080319B, Swift-BAT refined analysis
  29. GRB080319B: Prompt PROMPT Detections
  30. GRB 080319C: Swift-XRT Team Refined Analysis
  31. GRB 080319B: Swift-XRT Team Refined Analysis
  32. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  33. GRB 080319C: AGILE-MCAL observation of the prompt emission
  34. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  35. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  36. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  37. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  38. GRB 080319B: TORTORA synchronous observation
  39. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  40. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  41. GRB 080319B: Enhanced Swift-XRT position
  42. GRB 080319A: Enhanced Swift-XRT position
  43. GRB 080319A, Swift-BAT refined analysis
  44. GRB 080319B: REM early data
  45. GRB 080319b light curve by Pi-of-the-Sky
  46. VLT/UVES redshift of GRB 080319B
  47. GRB 080319C: Early Super-LOTIS Observations
  48. GRB 080319C: Swift detection of a burst with an optical afterglow
  49. GRB 080319C: KAIT OA candidate
  50. GRB 080319A: REM observations
  51. GRB 080319b prompt optical observation by Pi-of-the-Sky
  52. GRB 080319B: Change in power law decay index
  53. GRB 080319B: Gemini-South Spectroscopy
  54. GRB 080319A: optical observations at the NOT
  55. GRB0 080319B : LOAO optical observation
  56. GRB 080319b: Early IR Imaging from PAIRITEL
  57. GRB080319B Liverpool Telescope optical afterglow candidate
  58. GRB 080319B: Super-LOTIS Detection of a Bright OT
  59. GRB 080319B: REM observations
  60. GRB 080319B: KAIT OA
  61. GRB080319A: P60 Optical Afterglow Observations
  62. GRB 080319B: UVOT Position
  63. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  64. GRB 080319A: Swift detection of a burst
  65. Swift Trigger 306745 is not a GRB
  66. Swift Trigger 306616 is not a GRB
  67. GRB080310, LBT and MDM photometry
  68. GRB080315: Bok Optical Observations
  69. Swift/UVOT observations of GRB 080315
  70. Swift trigger 306323: Swift-BAT/XRT refined analysis
  71. SAX J1818.6-1703: Swift detection (trigger 306379)
  72. GRB 080315: Optical observations
  73. GRB 080315: TAROT Calern observatory optical observations
  74. GRB 080315: Swift detection of a possible burst
  75. GRB080310 : Lulin Optical observations
  76. GRB080310, unusual slow decay in the optical
  77. GRB 080310: GAO 150cm telescope Optical Observation
  78. GRB080310 : Optical observations by LOAO and Lulin
  79. GRB 080310: ROTSE-III Observations of Optical Counterpart
  80. GRB080310: Optical observation by MITSuME telescope
  81. GRB080310, optical observations with the LBT
  82. GRB 080307: GAO 150cm telescope Optical Observation
  83. GRB 080229A: GAO 150cm telescope Optical Observation
  84. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  85. GRB 080307: NIR upper limit
  86. GRB 080229: NIR upper limit
  87. GRB 080310: early RAPTOR multicolor observations
  88. GRB 080310, Swift-BAT refined analysis
  89. GRB080210: optical observations
  90. GRB080307: optical upper limit
  91. GRB 080310: Swift-XRT refined analysis
  92. GRB 080310: Swift/UVOT Refined Analysis
  93. GRB 080310: Redshift from Keck/DEIMOS Spectra
  94. GRB 080310 - SDSS Pre-Burst Observations
  95. GRB080310 : Lulin optical observation
  96. GRB 080310: Enhanced Swift-XRT position
  97. GRB 080310: RRM optical photometry with the VLT
  98. GRB080310, detection of break in optical
  99. GRB 080310: VLT/UVES spectroscopy
  100. GRB080310, optical observations with LBT

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