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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"

21018 results found.

  1. Gemini-South observations of XRF 080109 / SN 2008D
  2. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  3. Discovery of Radio Emission from Transient in NGC 2770
  4. XRF 080109 in NGC2770: NIR observations at TNG
  5. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  6. XRF 080109 in NGC2770: Detectable Superluminal Motion
  7. XRF in NGC 2770: Search for X-ray periodicity
  8. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  9. Opticall follow-ups for the X-ray transient in NGC 2770
  10. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  11. Swift UVOT Observations of the X-ray transient in NGC 2770
  12. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  13. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  14. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  15. GRB 071227: optical afterglow
  16. GRB 071227: Magellan redshift confirmation
  17. GRB 071227: Magellan observations
  18. GRB071227: Swift/UVOT refined analysis
  19. GRB 071227: REM NIR and Optical observations
  20. GRB071020: optical observations
  21. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  22. GRB 071129: Swift detection of a burst
  23. Konus-Wind and Konus-A observations of GRB 071125
  24. GRB 071112C: Optical/NIR observations
  25. VLA radio detection of GRB 071122
  26. GRB071122: Swift/UVOT Observations
  27. GRB071104: NIR Afterglow Candidate at TNG
  28. GRB 071122: MASTER optical observation
  29. GRB 071122 Swift-XRT refined analysis
  30. GRB 071122: P60 Optical Afterglow Candidate
  31. GRB 071122: ROTSE-III Optical Limits
  32. GRB 071118: P60 Observations
  33. GRB071118 MITSuME OAO optical observation
  34. GRB 071118: Observations from OSN
  35. GRB 071117: VLT observations and probable redshift
  36. Swift/UVOT observations of GRB071118
  37. Konus-Wind and Konus-A observations of GRB 071117
  38. Swift XRT follow-up observations of GRB071008
  39. Swift/UVOT upper limits for GRB 071117
  40. GRB 071117: Gemini Optical Afterglow Discovery
  41. GRB 071118, Swift-BAT refined analysis
  42. GRB 071117: TAROT La Silla observatory optical observations
  43. GRB 071112B: Gemini Image Differencing
  44. GRB 071117: Gemini Observations
  45. GRB 071117: Las Campanas optical observations
  46. VLT FORS2 observations of short hard GRB071112B
  47. GRB 071117: Initial Swift/UVOT observations
  48. GRB 071117: Swift detection of a bright burst
  49. VLA radio upper limit on GRB 071112C
  50. ATCA radio observations of short hard burst GRB 071112B
  51. GRB 071112C: Optical and NIR data observed with KANATA
  52. GRB 071112C: WSRT Radio Observations
  53. GRB 071112C: optical observation
  54. GRB 071112C: Gemini Absorption Redshift
  55. GRB 071112B: 2nd epoch of Magellan i-band imaging
  56. GRB 071112C : Second Epoch Lulin R-band observations
  57. GRB071112C MITSuME Okayama Optical Observation
  58. GRB 071112C: Swift/UVOT observations
  59. GRB 071112C: Optical observations at Crni Vrh
  60. Swift UVOT upper limits of GRB071112B
  61. GRB 071112B: Magellan i-band imaging
  62. GRB 071112B: Gemini Optical Imaging
  63. GRB071112C: NOT observations
  64. GRB 071112C : Lulin R-band observation
  65. GRB 071112C: RTT150 optical observations
  66. GRB 071112C: TAROT Calern observatory optical observations
  67. Swift XRT follow-up observations of GRB071028B
  68. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  69. GRB 071112C: Optical and NIR afterglows observed with KANATA
  70. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  71. GRB071109: Super-LOTIS observations
  72. VLA IInd observation of INTEGRAL burst GRB 071109
  73. GRB 071109: further Swift-XRT analysis
  74. GRB 071109: TAROT Calern observatory optical observations
  75. No radio detection at Swift-XRT position
  76. GRB 071109: Swift-XRT possible X-ray counterpart
  77. VLA prompt radio detection of the INTEGRAL burst 071109
  78. GRB 071109: BOOTES-2 prompt optical observations
  79. Swift XRT and UVOT observations of GRB071028B
  80. GRB071101: Optical and NIR upper limits by KANATA
  81. GRB 071101: TAROT Calern observatory optical observations
  82. GRB 071101: BOOTES-2 prompt optical observations
  83. GRB 071020: MITSuME Akeno optical observations
  84. GRB 071031: REM NIR and Optical observation
  85. GRB 071031, SMARTS afterglow observations
  86. GRB 071031: VLT high-resolution spectroscopy
  87. GRB071025: Optical+NIR observations
  88. GRB 071028: SARA observations of variable source
  89. Swift UVOT upper limits to GRB071028
  90. GRB071028: Xinglong EST V-band upper limit
  91. GRB 071025: Kuiper Telescope Optical Observations
  92. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  93. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  94. GRB 071025: SARA VRI upper limits
  95. GRB 071025 Milagro GeV/TeV Observations
  96. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  97. Swift UVOT upper limits
  98. GRB 071025: Early Super-LOTIS Observations
  99. GRB071021 : CFHT Ks-band observation
  100. GRB 071025: ROTSE-III Refined Analysis

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