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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32541 results found.

  1. GRB 080603B : Liverpool Telescope Observations
  2. Konus-Wind observation of GRB 080603B
  3. GRB 080603B: Swift-XRT refined analysis
  4. GRB 080603A: Swift-XRT detection of the afterglow
  5. GRB 080430: optical observations
  6. GRB 080603B: Swift/UVOT detection of the afterglow
  7. GRB 080603B, Swift-BAT refined analysis
  8. GRB 080604: Hobby-Eberly Telescope spectroscopy
  9. GRB 080603A: Swift/UVOT detection of the afterglow
  10. GRB080603B: RTT150 optical observations, break in light curves
  11. GRB 080604: Early Super-LOTIS Observations
  12. GRB080604: confirmation of optical afterglow
  13. GRB080603B: NOT redshift
  14. GRB 080603B: BOOTES2/TELMA optical observations
  15. GRB080603: Super-LOTIS detection of Optical Counterpart
  16. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  17. GRB 080603: Gemini-North redshift
  18. GRB 080602, Swift-BAT refined analysis
  19. GRB 080602: Swift-XRT refined analysis
  20. Konus-Wind observation of GRB 080602
  21. GRB 080602: NOT R-band upper limit
  22. Swift analysis of BAT Slew Survey event (Trigger=009)
  23. GRB 080523: afterglow confirmation and redshift constraints
  24. Konus-Wind observation of reactivation of SGR 1627-41
  25. Reactivation of SGR 1627-41
  26. GRB 080524: Swift XRT and UVOT analysis
  27. GRB 080503: 2nd Epoch Chandra X-ray Observations
  28. GRB 080523: Swift-XRT refined analysis
  29. GRB 080523, Swift-BAT refined analysis
  30. GRB 080520: VLT host detection
  31. GRB 080523: VLT optical observations
  32. Swift/UVOT observations of GRB 080523
  33. GRB 080515: KPNO 4m NIR afterglow detection
  34. GRB 80516: Swift/UVOT Observations
  35. GRB 080515: Swift-XRT position and analysis
  36. GRB 080520, Swift-BAT refined analysis
  37. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  38. GRB 080514B: UVOT Observations
  39. GRB080520: Swift/UVOT observations
  40. GRB 080520: VLT redshift
  41. GRB 080520, GROND observations
  42. GRB 080520: Swift XRT Refined Analysis
  43. Konus-Wind observation of GRB 080514B
  44. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  45. GRB 080503: Further HST imaging
  46. GRB 080517, Swift-BAT refined analysis
  47. GRB 080516, GROND further analysis
  48. GRB 080517: Swift-XRT refined analysis
  49. GRB 080514B: Further NIR observations
  50. GRB080517: Liverpool Telescope Optical Observations
  51. GRB 080516, GROND 2nd epoch observations
  52. GRB 080516, GROND observations
  53. GRB080430: optical observations
  54. GRB 080516, SMARTS optical/IR observations
  55. GRB 080516: Swift-XRT Team refined analysis
  56. GRB 080516, Swift-BAT refined analysis
  57. GRB 080514B: NOT observations
  58. Errartum: VLA upper limit on GRB 080507
  59. VLA upper limit on GRB 080705
  60. GRB 080514B : redshift estimation
  61. Konus-Wind observation of GRB 080513
  62. Swift-BAT refined analysis for Trigger 311603: Galactic source
  63. GRB 080515, Swift-BAT refined analysis
  64. GRB 080514B: KPNO 4m IR observations
  65. GRB 080514B: slow fading behaviour ?
  66. GRB 080514B: Swift-XRT analysis
  67. GRB 080514B, GROND observations
  68. GRB 080514B: Finding chart
  69. GRB 080514B: Afterglow candidate
  70. GRB 080514B: Watcher observations
  71. GRB 080514B: possible AGILE detection at E>50 MeV
  72. procesure for GRB Circular
  73. Konus-Wind observation of GRB 080507
  74. GRB 080506: NAYUTA Optical Observation
  75. GRB 080507: Suzaku WAM observation of the prompt emission
  76. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  77. GRB 080507: Keck photometry
  78. GRB 080507: E Pur Si Muove!
  79. GRB 080503: Hubble Space Telescope Imaging
  80. GRB080507: Swift/UVOT followup observations
  81. GRB 080507: Optical Afterglow
  82. GRB 080506:Optical observations from HCT
  83. GRB 080507: Swift-XRT position of a possible afterglow
  84. GRB 080506: VLA radio upper limit
  85. GRB 080506: TLS 2nd Epoch - possible light curve break
  86. GRB 080503: Fading in continued Gemini imaging
  87. GRB 080506: Swift XRT refined analysis
  88. GRB080506: Swift/UVOT observations
  89. GRB 080506, Swift-BAT refined analysis
  90. GRB080503, RIMOTS optical upper limit
  91. GRB 080506: Observations from NOT
  92. GRB 080506: optical observation from Ondrejov
  93. GRB 080506: TLS afterglow detection in VRIZ
  94. GRB 080506: Optical observation with KANATA/TRISPEC
  95. GRB 080503: VLA radio upper limit
  96. GRB 080503: Observations from NOT
  97. GRB 080503: Slow-rise optical AG ?
  98. GRB 080430: TLS imaging one day after the GRB
  99. GRB 080503: No further optical rebrightening
  100. GRB 080503: Late-time Optical rebrightening (possible mini-SN)

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