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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

31728 results found.

  1. GRB 071227: Swift-XRT refined analysis
  2. GRB 071227: VLT probable redshift of the candidate host galaxy
  3. GRB 071227: Magellan observations
  4. GRB071227: Swift/UVOT refined analysis
  5. GRB 071227: REM NIR and Optical observations
  6. Swift-BAT refined analysis of short GRB 071227
  7. GRB071020: optical observations
  8. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  9. Swift-BAT trigger 298308 is not a GRB
  10. GRB 071125: Suzaku WAM observation of the prompt emission
  11. GRB 070429B: Probable host galaxy and redshift
  12. GRB 071129, Swift-BAT refined analysis
  13. Konus-Wind and Konus-A observations of GRB 071125
  14. GRB 071112C: Optical/NIR observations
  15. Disregard the "GRB 071126" position
  16. VLA radio detection of GRB 071122
  17. GRB071122: Swift/UVOT Observations
  18. GRB071104: NIR Afterglow Candidate at TNG
  19. GRB 071122: MASTER optical observation
  20. GRB 071122, Swift-BAT refined analysis
  21. GRB 071122 Swift XRT position update sent in error.
  22. GRB 071122 Swift-XRT refined analysis
  23. GRB 071122: Corrected P60 Coordinates
  24. GRB071122: Gemini Absorption redshift
  25. GRB 071122: P60 Optical Afterglow Candidate
  26. GRB 071122: ROTSE-III Optical Limits
  27. GRB 071118: P60 Observations
  28. GRB071118 MITSuME OAO optical observation
  29. GRB 071118: Observations from OSN
  30. GRB 071117: VLT observations and probable redshift
  31. Swift/UVOT observations of GRB071118
  32. GRB 071117: Swift-XRT revised position
  33. Konus-Wind and Konus-A observations of GRB 071117
  34. Swift XRT follow-up observations of GRB071008
  35. Swift/UVOT upper limits for GRB 071117
  36. GRB071118: Swift XRT refined analysis
  37. GRB 071117: Gemini Optical Afterglow Discovery
  38. GRB 071118, Swift-BAT refined analysis
  39. GRB 071112B: Gemini Image Differencing
  40. GRB 071117: Gemini Observations
  41. GRB 071117: Swift-XRT refined analysis
  42. GRB 071117, Swift-BAT refined analysis
  43. VLT FORS2 observations of short hard GRB071112B
  44. GRB 071117: Swift/XRT position
  45. VLA radio upper limit on GRB 071112C
  46. ATCA radio observations of short hard burst GRB 071112B
  47. GRB 071112C: Optical and NIR data observed with KANATA
  48. Correction to the Swift-BAT Transient Identification (trigger=296683)
  49. GRB 071112C: WSRT Radio Observations
  50. GRB071112C: Errata of MITSuME Ic band photometry
  51. GRB 071112C: optical observation
  52. GRB 071112C: optical observation
  53. GRB 071112C: emission lines and refined VLT redshift
  54. GRB 071112C MITSuME Akeno early optical observation
  55. GRB 071112C: Gemini Absorption Redshift
  56. GRB 071112B: 2nd epoch of Magellan i-band imaging
  57. GRB 071112C: SARA upper limit
  58. GRB 071112C : Second Epoch Lulin R-band observations
  59. GRB071112C MITSuME Okayama Optical Observation
  60. GRB 071112C: Swift-BAT refined analysis
  61. GRB 071112C: Swift/UVOT observations
  62. GRB 071112C: Swift XRT refined analysis
  63. GRB 071112C: Optical observations at Crni Vrh
  64. Swift UVOT upper limits of GRB071112B
  65. GRB 071112C: VLT redshift
  66. GRB 071112B: Magellan i-band imaging
  67. GRB 071112B: Gemini Optical Imaging (Correction)
  68. GRB 071112B: Gemini Optical Imaging
  69. GRB 071112B: Swift-XRT preliminary analysis
  70. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  71. GRB071112C: NOT observations
  72. GRB 071112C: Palomar Pre-Imaging
  73. Swift-BAT trigger 296491 is not a GRB
  74. GRB 071112C : Lulin R-band observation
  75. GRB 071112C: RTT150 optical observations
  76. Swift XRT follow-up observations of GRB071028B
  77. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  78. GRB 071112C: Optical and NIR afterglows observed with KANATA
  79. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  80. GRB 071112B: ROTSE-III Rapid Optical Limits
  81. GRB071109: Super-LOTIS observations
  82. VLA IInd observation of INTEGRAL burst GRB 071109
  83. Swift/UVOT initial analysis of GRB071109
  84. GRB 071109: further Swift-XRT analysis
  85. No radio detection at Swift-XRT position
  86. GRB 071109: Swift-XRT possible X-ray counterpart
  87. VLA prompt radio detection of the INTEGRAL burst 071109
  88. GRB 071109: IBIS refined analysis
  89. GRB 071109: BOOTES-2 prompt optical observations
  90. GRB 071104: Swift-XRT Team Refined Analysis
  91. GRB 071104: Possible Swift UVOT Afterglow Candidate
  92. GRB 071104: Swift-XRT position
  93. GRB071010b: optical observation
  94. Swift XRT and UVOT observations of GRB071028B
  95. GRB 071101, Swift-BAT refined analysis
  96. GRB 071101: Swift-XRT Team refined analysis
  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. GRB 071101: Swift XRT position

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