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

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