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

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