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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"

15987 results found.

  1. GRB 080319C: KAIT OA observations
  2. GRB 080320: ROTSE-III Optical Limits
  3. GRB 080319B : Lulin observation of temporal break at 0.2 days
  4. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  5. GRB 080319B: optical observations
  6. GRB 080319B: RAPTOR observations of a naked eye burst
  7. GRB 080319A: Swift-XRT Team Refined Analysis
  8. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  9. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  10. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  11. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  12. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  13. GRB 080319B: TORTORA synchronous observation
  14. GRB 080319B: REM early data
  15. VLT/UVES redshift of GRB 080319B
  16. GRB 080319C: Swift detection of a burst with an optical afterglow
  17. GRB 080319A: REM observations
  18. GRB 080319b prompt optical observation by Pi-of-the-Sky
  19. GRB 080319B: Gemini-South Spectroscopy
  20. GRB 080319A: optical observations at the NOT
  21. GRB0 080319B : LOAO optical observation
  22. GRB080319B Liverpool Telescope optical afterglow candidate
  23. GRB080319A: P60 Optical Afterglow Observations
  24. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  25. GRB080315: Bok Optical Observations
  26. GRB 080315: Optical observations
  27. GRB 080315: TAROT Calern observatory optical observations
  28. GRB080310 : Lulin Optical observations
  29. GRB080310, unusual slow decay in the optical
  30. GRB 080310: GAO 150cm telescope Optical Observation
  31. GRB080310 : Optical observations by LOAO and Lulin
  32. GRB 080310: ROTSE-III Observations of Optical Counterpart
  33. GRB080310: Optical observation by MITSuME telescope
  34. GRB080310, optical observations with the LBT
  35. GRB 080307: GAO 150cm telescope Optical Observation
  36. GRB 080229A: GAO 150cm telescope Optical Observation
  37. GRB080210: optical observations
  38. GRB080307: optical upper limit
  39. GRB 080310: Swift/UVOT Refined Analysis
  40. GRB080310 : Lulin optical observation
  41. GRB 080310: RRM optical photometry with the VLT
  42. GRB080310, detection of break in optical
  43. GRB 080310: VLT/UVES spectroscopy
  44. GRB080310, optical observations with LBT
  45. GRB 080310, SMARTS optical/IR afterglow observations
  46. GRB 080310: Magellan redshift
  47. GRB 080310: Swift detection of a burst with optical afterglow
  48. GRB080229, optical upper limit (Correction)
  49. GRB080307, optical upper limit
  50. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  51. GRB080229, optical upper limit
  52. GRB 080307: Early RAPTOR Limits
  53. GRB 080307: TNT optical observation
  54. GRB080307: Optical upper limits
  55. GRB 080307: retraction of UVOT candidate
  56. GRB 080307 : BOAO optical afterglow observation
  57. GRB 080307: Optical observation with DMC/KANATA
  58. Swift UVOT observations of GRB080229B
  59. GRB 080303A: Faulkes Telescope South optical afterglow observations
  60. GRB 080303: Swift detection of a burst with optical afterglow
  61. GRB 080303A: ROTSE-III Optical Limits
  62. GRB 080229: Deep Gemini/GMOS optical observations
  63. GRB080229: Possible optical afterglow
  64. GRB 080229: Faulkes Telescope South optical limit
  65. GRB 080229A: ROTSE-III Optical Limits
  66. Early optical shallow decay in GRB 071112C
  67. GRB080207: optical observations
  68. GRB080205: optical observations
  69. GRB080211: optical observations
  70. GRB 071010B : Early optical brightening detected by TAOS
  71. ESO optical and NIR observations of GRB 080218B
  72. GRB 080212: Mount Abu NIR observations
  73. GRB 080218b, SMARTS optical/IR limits
  74. GRB 080212: VLT optical rapid decay
  75. GRB 080212: REM refined analysis
  76. VLA radio upper limit on GRB 080212
  77. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  78. GRB 080212: Gemini-South optical observations
  79. GRB 080212: optical observations
  80. GRB 080210: Swift/UVOT Refined Analysis
  81. GRB 080207: optical observations.
  82. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  83. GRB 080210: VLT redshift
  84. GRB 080210: GOND detection in all bands and redshift upper limit
  85. GRB 080210: Swift detection of a burst with optical afterglow
  86. GRB 080210: TAROT La Silla observatory optical detection
  87. GRB 080205: GAO 150cm telescope Optical limit
  88. GRB 080207: Optical limits from Gemini-South
  89. GRB 080205: RTT150 optical observations
  90. GRB080207: RTT150 Optical Observations
  91. GRB 080207: REM NIR observations
  92. GRB 080207: TAROT Calern observatory optical observations
  93. GRB 080205 optical upper limit
  94. GRB 080205: MASTER optical observation
  95. GRB 080205: optical observation
  96. GRB 080205: OA evolution from KAIT observations
  97. GRB 080205: Swift/UVOT observations
  98. GRB 080129: Optical observations from OSN
  99. X-ray transient in NGC 2770: RTT150 optical observations
  100. GRB 080129: KAIT optical limits

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