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

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