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

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