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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: second epoch imaging from Canarias (correction to GCN7469)
  2. GRB 080319C: KAIT OA observations
  3. GRB 080320 - SDSS Pre-Burst Observations
  4. GRB 080320: Swift detection of a burst
  5. GRB 080320: ROTSE-III Optical Limits
  6. GRB 080319B : Lulin observation of temporal break at 0.2 days
  7. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  8. GRB 080319B: optical observations
  9. GRB 080319C - SDSS Pre-Burst Observations
  10. GRB 080319A SDSS Pre-Burst Observations
  11. Swift-BAT trigger 306829 is IGR J16479-4514
  12. GRB080319B - SDSS Pre-Burst Observations
  13. GRB 080319B: RAPTOR observations of a naked eye burst
  14. GRB 080319A: Swift-XRT Team Refined Analysis
  15. GRB 080319B, Swift-BAT refined analysis
  16. GRB080319B: Prompt PROMPT Detections
  17. GRB 080319C: Swift-XRT Team Refined Analysis
  18. GRB 080319B: Swift-XRT Team Refined Analysis
  19. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  20. GRB 080319C: AGILE-MCAL observation of the prompt emission
  21. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  22. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  23. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  24. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  25. GRB 080319B: TORTORA synchronous observation
  26. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  27. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  28. GRB 080319B: Enhanced Swift-XRT position
  29. GRB 080319A: Enhanced Swift-XRT position
  30. GRB 080319A, Swift-BAT refined analysis
  31. GRB 080319B: REM early data
  32. GRB 080319b light curve by Pi-of-the-Sky
  33. VLT/UVES redshift of GRB 080319B
  34. GRB 080319C: Early Super-LOTIS Observations
  35. GRB 080319C: Swift detection of a burst with an optical afterglow
  36. GRB 080319C: KAIT OA candidate
  37. GRB 080319A: REM observations
  38. GRB 080319b prompt optical observation by Pi-of-the-Sky
  39. GRB 080319B: Change in power law decay index
  40. GRB 080319B: Gemini-South Spectroscopy
  41. GRB 080319A: optical observations at the NOT
  42. GRB0 080319B : LOAO optical observation
  43. GRB 080319b: Early IR Imaging from PAIRITEL
  44. GRB080319B Liverpool Telescope optical afterglow candidate
  45. GRB 080319B: Super-LOTIS Detection of a Bright OT
  46. GRB 080319B: REM observations
  47. GRB 080319B: KAIT OA
  48. GRB080319A: P60 Optical Afterglow Observations
  49. GRB 080319B: UVOT Position
  50. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  51. GRB 080319A: Swift detection of a burst
  52. Swift Trigger 306745 is not a GRB
  53. Swift Trigger 306616 is not a GRB
  54. GRB080310, LBT and MDM photometry
  55. GRB080315: Bok Optical Observations
  56. Swift/UVOT observations of GRB 080315
  57. Swift trigger 306323: Swift-BAT/XRT refined analysis
  58. SAX J1818.6-1703: Swift detection (trigger 306379)
  59. GRB 080315: Optical observations
  60. GRB 080315: TAROT Calern observatory optical observations
  61. GRB 080315: Swift detection of a possible burst
  62. GRB080310 : Lulin Optical observations
  63. GRB080310, unusual slow decay in the optical
  64. GRB 080310: GAO 150cm telescope Optical Observation
  65. GRB080310 : Optical observations by LOAO and Lulin
  66. GRB 080310: ROTSE-III Observations of Optical Counterpart
  67. GRB080310: Optical observation by MITSuME telescope
  68. GRB080310, optical observations with the LBT
  69. GRB 080307: GAO 150cm telescope Optical Observation
  70. GRB 080229A: GAO 150cm telescope Optical Observation
  71. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  72. GRB 080307: NIR upper limit
  73. GRB 080229: NIR upper limit
  74. GRB 080310: early RAPTOR multicolor observations
  75. GRB 080310, Swift-BAT refined analysis
  76. GRB080210: optical observations
  77. GRB080307: optical upper limit
  78. GRB 080310: Swift-XRT refined analysis
  79. GRB 080310: Swift/UVOT Refined Analysis
  80. GRB 080310: Redshift from Keck/DEIMOS Spectra
  81. GRB 080310 - SDSS Pre-Burst Observations
  82. GRB080310 : Lulin optical observation
  83. GRB 080310: Enhanced Swift-XRT position
  84. GRB 080310: RRM optical photometry with the VLT
  85. GRB080310, detection of break in optical
  86. GRB 080310: VLT/UVES spectroscopy
  87. GRB080310, optical observations with LBT
  88. GRB 080310: Magellan redshift revision
  89. GRB 080310: Lick/Kast Spectroscopy
  90. GRB080310: Super-LOTIS suggestion of brightening
  91. GRB 080310, SMARTS optical/IR afterglow observations
  92. GRB 080310: REM observations
  93. GRB 080310: Magellan redshift
  94. GRB 080310 afterglow candidate (correction to UT time)
  95. GRB 080310: Swift detection of a burst with optical afterglow
  96. GRB 080310 afterglow candidate
  97. GRB080229, optical upper limit (Correction)
  98. GRB080307, optical upper limit
  99. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  100. GRB080229, optical upper limit

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