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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"

38621 results found.

  1. GRB 071118: Observations from OSN
  2. GRB 071117: VLT observations and probable redshift
  3. Swift/UVOT observations of GRB071118
  4. GRB 071117: Swift-XRT revised position
  5. Konus-Wind and Konus-A observations of GRB 071117
  6. Swift XRT follow-up observations of GRB071008
  7. Swift/UVOT upper limits for GRB 071117
  8. GRB071118: Swift XRT refined analysis
  9. GRB 071117: Gemini Optical Afterglow Discovery
  10. GRB 071118, Swift-BAT refined analysis
  11. GRB 071112B: Gemini Image Differencing
  12. GRB 071118: Swift detection of a burst
  13. GRB 071117: Gemini Observations
  14. GRB 071117: Las Campanas optical observations
  15. GRB 071117: Swift-XRT refined analysis
  16. VLT FORS2 observations of short hard GRB071112B
  17. GRB 071117: Swift/XRT position
  18. GRB 071117: Initial Swift/UVOT observations
  19. GRB 071117: Swift detection of a bright burst
  20. Swift detection of MXB 0656-072
  21. VLA radio upper limit on GRB 071112C
  22. ATCA radio observations of short hard burst GRB 071112B
  23. GRB 071112C: Optical and NIR data observed with KANATA
  24. Correction to the Swift-BAT Transient Identification (trigger=296683)
  25. GRB 071112C: WSRT Radio Observations
  26. GRB071112C: Errata of MITSuME Ic band photometry
  27. GRB 071112C: optical observation
  28. GRB 071112C: optical observation
  29. GRB 071112C: emission lines and refined VLT redshift
  30. GRB 071112C MITSuME Akeno early optical observation
  31. GRB 071112C: Gemini Absorption Redshift
  32. GRB 071112B: 2nd epoch of Magellan i-band imaging
  33. GRB 071112C: SARA upper limit
  34. GRB 071112C : Second Epoch Lulin R-band observations
  35. GRB071112C MITSuME Okayama Optical Observation
  36. GRB 071112C: Swift-BAT refined analysis
  37. GRB 071112C: Swift/UVOT observations
  38. GRB 071112C: Swift XRT refined analysis
  39. GRB 071112C: Optical observations at Crni Vrh
  40. Swift UVOT upper limits of GRB071112B
  41. GRB 071112C: VLT redshift
  42. GRB 071112B: Magellan i-band imaging
  43. GRB 071112B: Gemini Optical Imaging (Correction)
  44. GRB 071112B: Gemini Optical Imaging
  45. GRB 071112B: Swift-XRT preliminary analysis
  46. GRB071112C: NOT observations
  47. Swift-BAT trigger 296491 is not a GRB
  48. GRB 071112C : Lulin R-band observation
  49. Swift XRT follow-up observations of GRB071028B
  50. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  51. GRB 071112C: Optical and NIR afterglows observed with KANATA
  52. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  53. GRB 071112B: ROTSE-III Rapid Optical Limits
  54. GRB 071112C: Swift detection of a burst with an optical counterpart
  55. GRB 071112B: Swift detection of a short hard burst
  56. GRB 071112: Swift detection of a possible burst
  57. GRB071109: Super-LOTIS observations
  58. VLA IInd observation of INTEGRAL burst GRB 071109
  59. Swift/UVOT initial analysis of GRB071109
  60. GRB 071109: further Swift-XRT analysis
  61. No radio detection at Swift-XRT position
  62. GRB 071109: Swift-XRT possible X-ray counterpart
  63. VLA prompt radio detection of the INTEGRAL burst 071109
  64. GRB 071109: IBIS refined analysis
  65. GRB 071109: BOOTES-2 prompt optical observations
  66. GRB 071109: A long GRB detected by INTEGRAL
  67. GRB 071104: Swift-XRT Team Refined Analysis
  68. GRB 071104: Possible Swift UVOT Afterglow Candidate
  69. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  70. GRB071010b: optical observation
  71. Swift XRT and UVOT observations of GRB071028B
  72. GRB 071101: Swift-XRT Team refined analysis
  73. GRB071101: Optical and NIR upper limits by KANATA
  74. GRB0711101: Two new source from Xinglong TNT observation
  75. GRB 071101: Swift XRT position
  76. GRB071101 LOAO B,V,R,I observation
  77. GRB 071101: BOOTES-2 prompt optical observations
  78. GRB 071101: Swift detection of a burst
  79. GRB 071031: Swift/UVOT detection of afterglow
  80. GRB 071031: Swift-XRT Team refined analysis
  81. GRB 071020: MITSuME Akeno optical observations
  82. GRB 071031: REM NIR and Optical observation
  83. GRB 071031, SMARTS afterglow observations
  84. GRB 071031: VLT high-resolution spectroscopy
  85. GRB 071031: Swift detection of a burst with an optical counterpart
  86. GRB 071028B Swift-BAT detection of a burst
  87. GRB 071028: SARA observations of variable source
  88. Swift UVOT upper limits to GRB071028
  89. GRB071028: Xinglong EST V-band upper limit
  90. GRB 071028: Swift-XRT Team refined analysis
  91. GRB 071028: Swift detection of a burst
  92. GRB 071025: Kuiper Telescope Optical Observations
  93. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  94. GRB 071018: Revised BAT position
  95. GRB071021: MARGE Optical Limits
  96. GRB071020, optical upper limit
  97. GRB 071025: SARA VRI upper limits
  98. GRB 071025 Milagro GeV/TeV Observations
  99. GRB 071025: SQIID JHK photometry
  100. Swift UVOT upper limits

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