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

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