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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"

16204 results found.

  1. GRB 130427A: optical observations
  2. GRB130514B: MASTER-Net optical observations.
  3. GRB 130514A: RATIR Optical and NIR Observations
  4. GRB 130513A: RATIR Optical and NIR Observations
  5. GRB 130513A: Swift/UVOT Upper Limits
  6. GRB 130514A: Swift/UVOT Upper Limits
  7. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  8. GRB 130514A: P60 Observations
  9. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  10. GRB130508A: MASTER-Net optical observations
  11. GRB130511A: SOAO Optical Observation
  12. GRB 130511A: Kanata/HOWPol optical observation
  13. GRB 130511A: MITSuME Okayama upper limits
  14. GRB 130511A: Upper limit by Xinglong TNT optical observation
  15. GRB 130511A: Gemini-North Redshift
  16. GRB 130511A: Swift detection of a burst with an optical counterpart
  17. GRB 130508A: MITSuME Akeno upper limits
  18. GRB 130508A: RATIR Optical and NIR Observations
  19. GRB 130427A: Keck/LRIS Observations
  20. GRB 130508A: MITSuME Okayama upper limits
  21. GRB130508A: BOOTES-3 optical limit
  22. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  23. GRB 130427A: Continued RATIR Optical and NIR Observations
  24. GRB 130427A, LBT optical spectrum
  25. GRB 130505B: Further Swift observations
  26. GRB 130505A: MITSuME Akeno Optical observation
  27. GRB 130427A, Watcher afterglow detection
  28. GRB 130427A: Excess optical emission consistent with an emerging supernova
  29. GRB 130505A: RATIR Optical and NIR Observations
  30. GRB 130505A: Tautenburg afterglow observations
  31. GRB 130427A: Tautenburg afterglow observations
  32. GRB 130505A: optical observations
  33. GRB 130427A: optical observations in CrAO
  34. GRB 130502A: optical upper limit
  35. Swift/UVOT observations of GRB130505A
  36. GRB 130505A: iTelescope T12 optical observations
  37. GRB 130505A: Xinglong TNT optical observations
  38. GRB 130505A; Weihai optical observations
  39. GRB 130505A: MITSuME Okayama Optical Observation
  40. GRB 130504A: IAC80 optical candidate
  41. GRB 130505A: Swift detection of a burst with optical afterglow
  42. GRB 130504A: MITSuME Okayama upper limits
  43. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  44. GRB 130504A: Swift/UVOT Upper Limits
  45. GRB 130502B: possible TNG counterpart
  46. GRB130502A: MASTER-Net optical observations
  47. GRB 130502B: Swift/UVOT Upper Limits
  48. GRB 130502A: Swift/UVOT Upper Limits
  49. GRB 130502A: RATIR Optical and NIR Observations
  50. GRB 130427A: Pan-STARRS 1 optical observations
  51. GRB 130418A: TNG NIR observations
  52. GRB 130502A: OSN and IAC80 I-band observations
  53. GRB 130427A: MITSuME Ishigakijima Optical Observation after 5 days
  54. GRB 130502A: T100 Observations
  55. GRB 130427A: Predictions about the occurrence of a supernova
  56. GRB 130427A: KAIT optical observations
  57. GRB 130427A: SARA-N optical observations
  58. GRB 130427A: VLA 20 GHz detection
  59. GRB 130427A: ABT optical observations
  60. GRB 130427A: GMRT radio detection
  61. GRB 130427A: Continued GMG optical observations
  62. GRB 130427A: Nishi-Harima Optical Spectroscopic Observations
  63. GRB 130427A: Continued RATIR Optical and NIR Observations
  64. GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
  65. GRB 130427A: Challis Observatory optical observations
  66. GRB 130427A: Continued Skynet/PROMPT Observations
  67. GRB 130427A: SARA-N detection
  68. GRB 130427A: Continued RATIR Optical and NIR Observations
  69. GRB 130427A: CrAO RT-22 36 GHz observation
  70. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  71. GRB 130425: MASTER-Net optical observations
  72. GRB 100728A: GROND host detection and X-shooter redshift
  73. GRB 130427B: MITSuME Ishigakijima upper limits
  74. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  75. GRB 130427B: RATIR Optical and NIR Observations
  76. GRB 130427A : Xinglong TNT optical observation
  77. GRB 130427A optical time series
  78. GRB 130427A, Optical Observations
  79. GRB 130427A: Continued iTelescope T21 optical observations
  80. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  81. GRB 130427A: SPI-ACS/INTEGRAL observations
  82. GRB 130427A: Continued RATIR Optical and NIR Observations
  83. GRB 130427A: CARMA 85 GHz detection
  84. GRB 130427A: SNUO/SOAO/BOAO Observation
  85. GRB 130427A: VLA 5 GHz detection
  86. GRB 130427A: NOT optical photometry and redshift
  87. GRB 130427B: MITSuME Okayama upper limits
  88. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  89. GRB 130427A: optical observations in CrAO
  90. GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
  91. GRB 130427A: Fermi-LAT detection of a burst
  92. GRB 130427A: Zadko observatory - Gingin optical observations
  93. GRB 130427A: GMG optical observation
  94. GRB 130427A: MITSuME Okayama Optical Observation
  95. GRB 130427A: Optical Observations
  96. GRB 130427B: Swift detection of a burst with optical counterpart
  97. GRB 130427A: RATIR Optical and NIR Observations
  98. GRB 130427A: Weihai optical observations
  99. GRB 130427A: iTelescope T11 optical observations
  100. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow

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