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

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