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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

21921 results found.

  1. GRB 080129: Gemini-South Imaging Observations
  2. GRB 080129 (?): UVOT Upper Limits
  3. GRB 080121: Upper limit on X-ray afterglow
  4. GRB 080123 : Suzaku WAM observation of the prompt emission
  5. Konus-Wind observation of GRB 080122
  6. GRB 080122 : Suzaku WAM observation of the prompt emission
  7. GRB 080121: Swift/UVOT upper limits
  8. SNe 2008D and 2007uy: Chandra Detections
  9. GRB 080121: Enhanced Swift-XRT position
  10. IPN triangulation of GRB080122
  11. GRB 080121: Nearby SDSS galaxies
  12. GRB 080123: Swift-XRT refined analysis
  13. GRB 080123: Swift/UVOT refined analysis
  14. GRB 080123: Enhanced Swift-XRT position
  15. GRB 080123: Swift detection of a short burst
  16. GRB 080120: GROND confirmation of the optical afterglow
  17. VLA radio upper limit on GRB 080120
  18. GRB080120: Swift XRT position
  19. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  20. XRF 080109 / SN 2008D: UKIRT JHK imaging
  21. optical observations, XRT in NGC 2770
  22. XRF 080109/SN 2008D: PROMPT Optical Imaging
  23. Gemini-South observations of XRF 080109 / SN 2008D
  24. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  25. Discovery of Radio Emission from Transient in NGC 2770
  26. XRF 080109 in NGC2770: NIR observations at TNG
  27. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  28. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  29. XRF 080109 in NGC2770: Detectable Superluminal Motion
  30. Refined Swift-XRT analysis of the transient in NGC 2770
  31. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  32. GRB 071227: Suzaku WAM observation of the prompt emission
  33. GRB 071227: optical afterglow
  34. Further Swift-BAT analysis of GRB 071227
  35. GRB 071227: Swift-XRT refined analysis
  36. GRB 071227: VLT probable redshift of the candidate host galaxy
  37. GRB071227: Swift/UVOT refined analysis
  38. GRB 071227: REM NIR and Optical observations
  39. GRB 071227: Swift detection of a burst
  40. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  41. GRB 071125: Suzaku WAM observation of the prompt emission
  42. GRB 070429B: Probable host galaxy and redshift
  43. GRB 071129, Swift-BAT refined analysis
  44. GRB 071129: Swift detection of a burst
  45. Konus-Wind and Konus-A observations of GRB 071125
  46. IPN triangulation of very bright GRB 071125
  47. GRB 071126: Enhanced Swift-XRT position
  48. GRB071122: Swift/UVOT Observations
  49. GRB071104: NIR Afterglow Candidate at TNG
  50. GRB 071122, Swift-BAT refined analysis
  51. GRB 071122 Swift-XRT refined analysis
  52. GRB 071122: P60 Optical Afterglow Candidate
  53. GRB 071122: ROTSE-III Optical Limits
  54. GRB 071122: Swift detection of a burst
  55. GRB 071118: P60 Observations
  56. GRB071118 MITSuME OAO optical observation
  57. GRB 071118: Observations from OSN
  58. GRB 071117: VLT observations and probable redshift
  59. Swift/UVOT observations of GRB071118
  60. Konus-Wind and Konus-A observations of GRB 071117
  61. Swift XRT follow-up observations of GRB071008
  62. Swift/UVOT upper limits for GRB 071117
  63. GRB071118: Swift XRT refined analysis
  64. GRB 071117: Gemini Optical Afterglow Discovery
  65. GRB 071117: TAROT La Silla observatory optical observations
  66. GRB 071118: Swift detection of a burst
  67. GRB 071117: Gemini Observations
  68. VLT FORS2 observations of short hard GRB071112B
  69. GRB 071117: Swift detection of a bright burst
  70. Swift detection of MXB 0656-072
  71. ATCA radio observations of short hard burst GRB 071112B
  72. GRB 071112C: Optical and NIR data observed with KANATA
  73. GRB 071112C MITSuME Akeno early optical observation
  74. GRB 071112C: SARA upper limit
  75. GRB 071112C : Second Epoch Lulin R-band observations
  76. GRB071112C MITSuME Okayama Optical Observation
  77. GRB 071112C: Swift-BAT refined analysis
  78. GRB 071112C: Swift XRT refined analysis
  79. Swift UVOT upper limits of GRB071112B
  80. GRB 071112B: Gemini Optical Imaging
  81. GRB 071112B: Swift-XRT preliminary analysis
  82. GRB 071112C : Lulin R-band observation
  83. GRB 071112C: TAROT Calern observatory optical observations
  84. Swift XRT follow-up observations of GRB071028B
  85. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  86. GRB 071112C: Optical and NIR afterglows observed with KANATA
  87. GRB 071112B: ROTSE-III Rapid Optical Limits
  88. GRB 071112C: Swift detection of a burst with an optical counterpart
  89. GRB 071112: Swift detection of a possible burst
  90. Swift/UVOT initial analysis of GRB071109
  91. GRB 071109: further Swift-XRT analysis
  92. GRB 071109: TAROT Calern observatory optical observations
  93. GRB 071109: Swift-XRT possible X-ray counterpart
  94. GRB 071104: Possible Swift UVOT Afterglow Candidate
  95. GRB 071104: Swift-XRT position
  96. Swift XRT and UVOT observations of GRB071028B
  97. GRB071101: Optical and NIR upper limits by KANATA
  98. GRB0711101: Two new source from Xinglong TNT observation
  99. GRB 071101: TAROT Calern observatory optical observations
  100. GRB071101 LOAO B,V,R,I observation

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