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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"

32509 results found.

  1. GRB 071122, Swift-BAT refined analysis
  2. GRB 071122 Swift XRT position update sent in error.
  3. GRB 071122 Swift-XRT refined analysis
  4. GRB 071122: Corrected P60 Coordinates
  5. GRB071122: Gemini Absorption redshift
  6. GRB 071122: P60 Optical Afterglow Candidate
  7. GRB 071122: ROTSE-III Optical Limits
  8. GRB 071118: P60 Observations
  9. GRB071118 MITSuME OAO optical observation
  10. GRB 071118: Observations from OSN
  11. GRB 071117: VLT observations and probable redshift
  12. Swift/UVOT observations of GRB071118
  13. GRB 071117: Swift-XRT revised position
  14. Konus-Wind and Konus-A observations of GRB 071117
  15. Swift XRT follow-up observations of GRB071008
  16. Swift/UVOT upper limits for GRB 071117
  17. GRB071118: Swift XRT refined analysis
  18. GRB 071117: Gemini Optical Afterglow Discovery
  19. GRB 071118, Swift-BAT refined analysis
  20. GRB 071112B: Gemini Image Differencing
  21. GRB 071117: Gemini Observations
  22. GRB 071117: Swift-XRT refined analysis
  23. GRB 071117, Swift-BAT refined analysis
  24. VLT FORS2 observations of short hard GRB071112B
  25. GRB 071117: Swift/XRT position
  26. VLA radio upper limit on GRB 071112C
  27. ATCA radio observations of short hard burst GRB 071112B
  28. GRB 071112C: Optical and NIR data observed with KANATA
  29. Correction to the Swift-BAT Transient Identification (trigger=296683)
  30. GRB 071112C: WSRT Radio Observations
  31. GRB071112C: Errata of MITSuME Ic band photometry
  32. GRB 071112C: optical observation
  33. GRB 071112C: optical observation
  34. GRB 071112C: emission lines and refined VLT redshift
  35. GRB 071112C MITSuME Akeno early optical observation
  36. GRB 071112C: Gemini Absorption Redshift
  37. GRB 071112B: 2nd epoch of Magellan i-band imaging
  38. GRB 071112C: SARA upper limit
  39. GRB 071112C : Second Epoch Lulin R-band observations
  40. GRB071112C MITSuME Okayama Optical Observation
  41. GRB 071112C: Swift-BAT refined analysis
  42. GRB 071112C: Swift/UVOT observations
  43. GRB 071112C: Swift XRT refined analysis
  44. GRB 071112C: Optical observations at Crni Vrh
  45. Swift UVOT upper limits of GRB071112B
  46. GRB 071112C: VLT redshift
  47. GRB 071112B: Magellan i-band imaging
  48. GRB 071112B: Gemini Optical Imaging (Correction)
  49. GRB 071112B: Gemini Optical Imaging
  50. GRB 071112B: Swift-XRT preliminary analysis
  51. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  52. GRB071112C: NOT observations
  53. GRB 071112C: Palomar Pre-Imaging
  54. Swift-BAT trigger 296491 is not a GRB
  55. GRB 071112C : Lulin R-band observation
  56. GRB 071112C: RTT150 optical observations
  57. Swift XRT follow-up observations of GRB071028B
  58. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  59. GRB 071112C: Optical and NIR afterglows observed with KANATA
  60. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  61. GRB 071112B: ROTSE-III Rapid Optical Limits
  62. GRB071109: Super-LOTIS observations
  63. VLA IInd observation of INTEGRAL burst GRB 071109
  64. Swift/UVOT initial analysis of GRB071109
  65. GRB 071109: further Swift-XRT analysis
  66. No radio detection at Swift-XRT position
  67. GRB 071109: Swift-XRT possible X-ray counterpart
  68. VLA prompt radio detection of the INTEGRAL burst 071109
  69. GRB 071109: IBIS refined analysis
  70. GRB 071109: BOOTES-2 prompt optical observations
  71. GRB 071104: Swift-XRT Team Refined Analysis
  72. GRB 071104: Possible Swift UVOT Afterglow Candidate
  73. GRB 071104: Swift-XRT position
  74. GRB071010b: optical observation
  75. Swift XRT and UVOT observations of GRB071028B
  76. GRB 071101, Swift-BAT refined analysis
  77. GRB 071101: Swift-XRT Team refined analysis
  78. GRB071101: Optical and NIR upper limits by KANATA
  79. GRB0711101: Two new source from Xinglong TNT observation
  80. GRB 071101: TAROT Calern observatory optical observations
  81. GRB 071101: Swift XRT position
  82. GRB 071101: BOOTES-2 prompt optical observations
  83. GRB 071101: a nearby galaxy
  84. GRB 071031, Swift-BAT refined analysis
  85. GRB 071031: Swift/UVOT detection of afterglow
  86. GRB 071031: Swift-XRT Team refined analysis
  87. GRB 071020: MITSuME Akeno optical observations
  88. GRB 071031: REM NIR and Optical observation
  89. GRB 071031, SMARTS afterglow observations
  90. GRB 071031: VLT high-resolution spectroscopy
  91. GRB071031: Rapid PROMPT Detections
  92. GRB 071028B Swift-BAT detection of a burst
  93. GRB071025: Optical+NIR observations
  94. GRB 071028: SARA observations of variable source
  95. Swift UVOT upper limits to GRB071028
  96. GRB 071028: Swift-XRT Team refined analysis
  97. GRB 071028, Swift-BAT refined analysis
  98. GRB 071025: Kuiper Telescope Optical Observations
  99. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  100. GRB 071018: Revised BAT position

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