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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"

15359 results found.

  1. XRF 080109 / SN 2008D: WSRT Radio Detection
  2. XRF 080109/SN 2008D: PROMPT Optical Imaging
  3. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  4. XRF 080109 in NGC2770: NIR observations at TNG
  5. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  6. XRF 080109 in NGC2770: Detectable Superluminal Motion
  7. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  8. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  9. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  10. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  11. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  12. GRB 071227: Suzaku WAM observation of the prompt emission
  13. Konus-Wind observation of GRB 071227
  14. GRB 071227: Magellan redshift confirmation
  15. GRB 071227: Swift-XRT refined analysis
  16. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  17. GRB 071125: Suzaku WAM observation of the prompt emission
  18. GRB 070429B: Probable host galaxy and redshift
  19. GRB 071129, Swift-BAT refined analysis
  20. Konus-Wind and Konus-A observations of GRB 071125
  21. IPN triangulation of very bright GRB 071125
  22. GRB 071122 Swift-XRT refined analysis
  23. GRB071118 MITSuME OAO optical observation
  24. GRB 071118: Observations from OSN
  25. Swift/UVOT observations of GRB071118
  26. GRB 071117: Swift-XRT revised position
  27. Konus-Wind and Konus-A observations of GRB 071117
  28. Swift/UVOT upper limits for GRB 071117
  29. GRB 071118, Swift-BAT refined analysis
  30. GRB 071117: TAROT La Silla observatory optical observations
  31. VLT FORS2 observations of short hard GRB071112B
  32. GRB 071117: Swift/XRT position
  33. GRB 071112C: Optical and NIR data observed with KANATA
  34. GRB071112C: Errata of MITSuME Ic band photometry
  35. GRB 071112C: optical observation
  36. GRB 071112C: optical observation
  37. GRB 071112C MITSuME Akeno early optical observation
  38. GRB 071112C: Gemini Absorption Redshift
  39. GRB071112C MITSuME Okayama Optical Observation
  40. GRB 071112B: Gemini Optical Imaging
  41. GRB 071112C : Lulin R-band observation
  42. GRB 071112C: TAROT Calern observatory optical observations
  43. Swift XRT follow-up observations of GRB071028B
  44. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  45. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  46. GRB 071109: further Swift-XRT analysis
  47. GRB 071109: Swift-XRT possible X-ray counterpart
  48. GRB 071109: IBIS refined analysis
  49. GRB 071109: BOOTES-2 prompt optical observations
  50. GRB 071104: Possible Swift UVOT Afterglow Candidate
  51. GRB 071104: Swift-XRT position
  52. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  53. GRB 071101: Swift-XRT Team refined analysis
  54. GRB071101: Optical and NIR upper limits by KANATA
  55. GRB0711101: Two new source from Xinglong TNT observation
  56. GRB 071101: Swift XRT position
  57. GRB 071101: BOOTES-2 prompt optical observations
  58. GRB 071020: MITSuME Akeno optical observations
  59. GRB 071031: REM NIR and Optical observation
  60. GRB 071031: VLT high-resolution spectroscopy
  61. GRB071025: Optical+NIR observations
  62. GRB071028: Xinglong EST V-band upper limit
  63. GRB 071025: Kuiper Telescope Optical Observations
  64. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  65. GRB 071018: Revised BAT position
  66. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  67. GRB071021: MARGE Optical Limits
  68. GRB071020, optical upper limit
  69. Swift UVOT upper limits
  70. GRB071025: Xinglong TNT I-band upper limit
  71. GRB 071025: Early Super-LOTIS Observations
  72. GRB 071025: R/I-band update
  73. GRB 071025: ROTSE-III Refined Analysis
  74. GRB 071025: Swift XRT refined position
  75. GRB071025: REM NIR afterglow
  76. GRB071021: Optical+NIR observations
  77. Optical observations of GRB 071020
  78. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  79. GRB 071021: Magellan i-band observation
  80. GRB 071021: correction to GCNC 6968
  81. GRB 071021: optical and NIR observations
  82. GRB 071021: possible high-z burst
  83. GRB 071021, Swift-BAT refined analysis
  84. GRB071018: 2nd epoch obsevations of Xinglong TNT
  85. GRB 071021: retraction of Faulkes Telescope South candidate
  86. GRB 071021: Xinglong TNT optical Upper Limit
  87. GRB 071021 : Lulin R-band limit
  88. Konus-Wind observation of GRB 071020
  89. GRB 071010B: Independent Confirmation of Break
  90. GRB 071020: Swift-XRT refined analysis
  91. GRB 071020: VLT spectroscopy
  92. GRB071020 - SDSS Pre-burst Observations
  93. GRB 071018: Mercator Telescope optical observations
  94. GRB 071018: SARA observations
  95. GRB 071017 - Swift XRT observations
  96. GRB 071010B: Light Curve Break Confirmed
  97. GRB 071018, Swift-BAT refined analysis
  98. GRB 071010B: Suzaku WAM observation of the prompt emission
  99. GRB 071013: TNT optical data refined analysis
  100. GRB 071010B: Keck/DEIMOS emission-line redshift

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