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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"

21983 results found.

  1. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  2. optical observations, XRT in NGC 2770
  3. XRF 080109/SN 2008D: PROMPT Optical Imaging
  4. Gemini-South observations of XRF 080109 / SN 2008D
  5. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  6. Discovery of Radio Emission from Transient in NGC 2770
  7. XRF 080109 in NGC2770: NIR observations at TNG
  8. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  9. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  10. XRF 080109 in NGC2770: Detectable Superluminal Motion
  11. XRF in NGC 2770: Search for X-ray periodicity
  12. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  13. Opticall follow-ups for the X-ray transient in NGC 2770
  14. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  15. Swift UVOT Observations of the X-ray transient in NGC 2770
  16. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  17. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  18. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  19. GRB 071227: optical afterglow
  20. GRB 071227: Magellan redshift confirmation
  21. GRB 071227: VLT probable redshift of the candidate host galaxy
  22. GRB 071227: Magellan observations
  23. GRB071227: Swift/UVOT refined analysis
  24. GRB 071227: REM NIR and Optical observations
  25. GRB071020: optical observations
  26. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  27. GRB 070429B: Probable host galaxy and redshift
  28. GRB 071129: Swift detection of a burst
  29. Konus-Wind and Konus-A observations of GRB 071125
  30. GRB 071112C: Optical/NIR observations
  31. VLA radio detection of GRB 071122
  32. GRB071122: Swift/UVOT Observations
  33. GRB071104: NIR Afterglow Candidate at TNG
  34. GRB 071122: MASTER optical observation
  35. GRB 071122 Swift-XRT refined analysis
  36. GRB 071122: P60 Optical Afterglow Candidate
  37. GRB 071122: ROTSE-III Optical Limits
  38. GRB 071118: P60 Observations
  39. GRB071118 MITSuME OAO optical observation
  40. GRB 071118: Observations from OSN
  41. GRB 071117: VLT observations and probable redshift
  42. Swift/UVOT observations of GRB071118
  43. Konus-Wind and Konus-A observations of GRB 071117
  44. Swift XRT follow-up observations of GRB071008
  45. Swift/UVOT upper limits for GRB 071117
  46. GRB 071117: Gemini Optical Afterglow Discovery
  47. GRB 071118, Swift-BAT refined analysis
  48. GRB 071117: TAROT La Silla observatory optical observations
  49. GRB 071112B: Gemini Image Differencing
  50. GRB 071117: Gemini Observations
  51. GRB 071117: Las Campanas optical observations
  52. VLT FORS2 observations of short hard GRB071112B
  53. GRB 071117: Initial Swift/UVOT observations
  54. GRB 071117: Swift detection of a bright burst
  55. VLA radio upper limit on GRB 071112C
  56. ATCA radio observations of short hard burst GRB 071112B
  57. GRB 071112C: Optical and NIR data observed with KANATA
  58. GRB 071112C: WSRT Radio Observations
  59. GRB 071112C: optical observation
  60. GRB 071112C: Gemini Absorption Redshift
  61. GRB 071112C : Second Epoch Lulin R-band observations
  62. GRB071112C MITSuME Okayama Optical Observation
  63. GRB 071112C: Swift/UVOT observations
  64. GRB 071112C: Optical observations at Crni Vrh
  65. Swift UVOT upper limits of GRB071112B
  66. GRB 071112B: Magellan i-band imaging
  67. GRB 071112B: Gemini Optical Imaging
  68. GRB071112C: NOT observations
  69. GRB 071112C : Lulin R-band observation
  70. GRB 071112C: RTT150 optical observations
  71. GRB 071112C: TAROT Calern observatory optical observations
  72. Swift XRT follow-up observations of GRB071028B
  73. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  74. GRB 071112C: Optical and NIR afterglows observed with KANATA
  75. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  76. GRB071109: Super-LOTIS observations
  77. VLA IInd observation of INTEGRAL burst GRB 071109
  78. GRB 071109: further Swift-XRT analysis
  79. GRB 071109: TAROT Calern observatory optical observations
  80. No radio detection at Swift-XRT position
  81. GRB 071109: Swift-XRT possible X-ray counterpart
  82. VLA prompt radio detection of the INTEGRAL burst 071109
  83. GRB 071109: BOOTES-2 prompt optical observations
  84. Swift XRT and UVOT observations of GRB071028B
  85. GRB071101: Optical and NIR upper limits by KANATA
  86. GRB0711101: Two new source from Xinglong TNT observation
  87. GRB 071101: TAROT Calern observatory optical observations
  88. GRB 071101: Swift XRT position
  89. GRB 071101: BOOTES-2 prompt optical observations
  90. GRB 071101: a nearby galaxy
  91. GRB 071020: MITSuME Akeno optical observations
  92. GRB 071031: REM NIR and Optical observation
  93. GRB 071031, SMARTS afterglow observations
  94. GRB 071031: VLT high-resolution spectroscopy
  95. GRB071025: Optical+NIR observations
  96. GRB 071028: SARA observations of variable source
  97. Swift UVOT upper limits to GRB071028
  98. GRB071028: Xinglong EST V-band upper limit
  99. GRB 071025: Kuiper Telescope Optical Observations
  100. GRB 071003: Infrared Photometry with Keck Adaptive Optics

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