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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"

15985 results found.

  1. GRB 101123A: MASTER prompt optical observations
  2. Optical observation of GRB 101024A
  3. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  4. GRB 101112A: OSN and BTA observations
  5. GRB 101117B: Swift/UVOT Discovery of an Optical Afterglow
  6. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  7. GRB 101112A: optical observations
  8. GRB 10112A: MASTER optical observations
  9. GRB 101112A - XRT source detection/analysis
  10. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  11. GRB 100906A: optical observations
  12. GRB 101030A : MOA optical observation
  13. GRB 101030A: GROND optical/NIR afterglow candidate
  14. GRB 101024A: GROND optical/NIR observations
  15. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  16. GRB 101024A: Zadko observatory - Gingin. Optical observations
  17. GRB101024A: Swift/UVOT
  18. GRB 101024A: GRAS06 optical observations
  19. Swift/UVOT observations of GRB101023A
  20. GRB 101024A: Swift detection of a burst with an optical afterglow
  21. GGRB 101023A: GROND detection of the optical-NIR afterglow
  22. GRB 101023A: Gemini discovery of optical afterglow
  23. GRB 101020A: MASTER polarization optical observations
  24. GRB 101008A: optical observations
  25. GRB101017A: MITSuME Okayama optical upper limits
  26. GRB 101017A: ROTSE-III Optical Limits
  27. GRB 101017A: Swift detection of a burst with optical counterpart
  28. GRB 101011A: BOOTES-3 Upper Limit
  29. GRB 100906A: D50 optical detection
  30. GRB 100902A: D50 optical limit
  31. GRB 101011A: Swift/UVOT observations
  32. GRB 101011A, GROND upper limits
  33. GRB 101011A: Zadko observatory - Gingin optical observations
  34. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  35. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  36. GRB 101008A: MASTER prompt optical observations
  37. GRB101008A, GROND detection of a fading afterglow
  38. GRB 101008A: SAO RAS optical observations
  39. GRB 100915 optical upper limit
  40. GRB 101008: Swift/UVOT Upper Limits
  41. GRB 101008A: 1.23m CAHA optical observations
  42. GRB 100925A / MAXI J1659-152: MASTER optical observations
  43. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  44. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  45. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  46. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  47. GRB 100925A/MAXI J1659-152 - NOT optical observations
  48. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  49. GRB 100924A: GROND detection of an optical/NIR afterglow
  50. GRB 100917A: TAROT La Silla observatory optical observations
  51. GRB 100915A: TAROT Calern observatory optical observations
  52. GRB100906A: Ashra-1 observation of early optical emission
  53. GRB100915A: MITSuME Ishigakijima Optical upper limits
  54. GRB 100915B: GRT Optical Observation
  55. GRB 100915A: GRT Optical Observation
  56. GRB100909A: MITSuME Ishigakijima Optical upper limits
  57. GRB 100901A: errata of GRB name in GCN 11270
  58. GRB 100901A: optical observations in Mondy and R-light curve
  59. GRB100909A: NOT optical afterglow confirmation
  60. GRB 100906A: optical observations at Mt.Terskol
  61. GRB 100901A: optical observation in Maidanak, break confirmation
  62. GRB 100909A: ROTSE-III Optical Limits
  63. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  64. GRB100901A: IAO optical upper limits at 4 days after the burst
  65. GRB 100901A: Confirmation of WSRT Radio Detection
  66. GRB 100901A: CrAO optical observations
  67. GRB 100906A: RTT150 optical observations
  68. GRB 100906A: GRAS-007 optical observations
  69. GRB100906A: Optical observations at IAO
  70. GRB 100906A: Swift/UVOT Observations
  71. GRB100906A: MITSuME Okayama Optical Observation
  72. GRB 100906A: Ondrejov 65cm observations
  73. GRB 100901A: ISON-NM optical observations
  74. GRB 100906A: MASTER preliminary polarization prompt light curve
  75. GRB 100906A : Faulkes Telescope North optical observations
  76. GRB 100906A: Swift detection of a burst with an optical afterglow
  77. GRB 100829A: MASTER optical observations
  78. GRB100905A: Optical upper limits at IAO
  79. GRB100905A: MITSuME Okayama optical upper limits
  80. GRB 100901A: Possible WSRT Radio Detection
  81. GRB100904A: BOOTES-3 Upper Limit
  82. GRB 100905A: MASTER Prompt Optical Observations
  83. Optical observations of GRB 100901A
  84. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  85. GRB100902A: Optical upper limits at IAO
  86. GRB10901A: Optical observations at IAO
  87. GRB 100901A: optical observation at Mt.Terskol
  88. GRB 100901A: multicolor photometry at Mt.Terskol
  89. GRB 100901A: Lightbuckets Optical Observations
  90. GRB 100901A: HCT optical observations
  91. GRB 100902A: 1.5m OSN I-band Upper Limits
  92. Tentative redshift of GRB100902A from Swift-XRT data
  93. GRB 100902A: Swift/UVOT Upper Limits
  94. GRB 100902A: optical observation at Mt.Terskol
  95. GRB 100901A: optical observation at Mt.Terskol
  96. GRB 100901A: Kanata Telescope observation of the optical afterglow
  97. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  98. GRB 100901A: TLS Observations: Break?
  99. GRB 100902A: MASTER Prompt Optical Observations
  100. GRB 100901A: ISON-NM optical observations

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