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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"

16112 results found.

  1. GRB 130504A: MITSuME Okayama upper limits
  2. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  3. GRB 130504A: Swift/UVOT Upper Limits
  4. GRB 130502B: possible TNG counterpart
  5. GRB130502A: MASTER-Net optical observations
  6. GRB 130502B: Swift/UVOT Upper Limits
  7. GRB 130502A: Swift/UVOT Upper Limits
  8. GRB 130502A: RATIR Optical and NIR Observations
  9. GRB 130427A: Pan-STARRS 1 optical observations
  10. GRB 130418A: TNG NIR observations
  11. GRB 130502A: OSN and IAC80 I-band observations
  12. GRB 130427A: MITSuME Ishigakijima Optical Observation after 5 days
  13. GRB 130502A: T100 Observations
  14. GRB 130427A: Predictions about the occurrence of a supernova
  15. GRB 130427A: KAIT optical observations
  16. GRB 130427A: SARA-N optical observations
  17. GRB 130427A: VLA 20 GHz detection
  18. GRB 130427A: ABT optical observations
  19. GRB 130427A: GMRT radio detection
  20. GRB 130427A: Continued GMG optical observations
  21. GRB 130427A: Nishi-Harima Optical Spectroscopic Observations
  22. GRB 130427A: Continued RATIR Optical and NIR Observations
  23. GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
  24. GRB 130427A: Challis Observatory optical observations
  25. GRB 130427A: SARA-N detection
  26. GRB 130427A: Continued RATIR Optical and NIR Observations
  27. GRB 130427A: CrAO RT-22 36 GHz observation
  28. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  29. GRB 130425: MASTER-Net optical observations
  30. GRB 100728A: GROND host detection and X-shooter redshift
  31. GRB 130427B: MITSuME Ishigakijima upper limits
  32. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  33. GRB 130427B: RATIR Optical and NIR Observations
  34. GRB 130427A : Xinglong TNT optical observation
  35. GRB 130427A optical time series
  36. GRB 130427A, Optical Observations
  37. GRB 130427A: Continued iTelescope T21 optical observations
  38. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  39. GRB 130427A: SPI-ACS/INTEGRAL observations
  40. GRB 130427A: Continued RATIR Optical and NIR Observations
  41. GRB 130427A: CARMA 85 GHz detection
  42. GRB 130427A: SNUO/SOAO/BOAO Observation
  43. GRB 130427A: VLA 5 GHz detection
  44. GRB 130427A: NOT optical photometry and redshift
  45. GRB 130427B: MITSuME Okayama upper limits
  46. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  47. GRB 130427A: optical observations in CrAO
  48. GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
  49. GRB 130427A: Fermi-LAT detection of a burst
  50. GRB 130427A: Zadko observatory - Gingin optical observations
  51. GRB 130427A: GMG optical observation
  52. GRB 130427A: MITSuME Okayama Optical Observation
  53. GRB 130427A: Optical Observations
  54. GRB 130427B: Swift detection of a burst with optical counterpart
  55. GRB 130427A: RATIR Optical and NIR Observations
  56. GRB 130427A: Weihai optical observations
  57. GRB 130427A: iTelescope T11 optical observations
  58. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  59. GRB 130427A: MITSuME Akeno Optical observation(T0+8000s~)
  60. GRB 130427A: PAIRITEL NIR Detections
  61. GRB 130427A: P60 early detection
  62. GRB 130427A: early optical observations
  63. GRB 130427A: P60 early nondetection
  64. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  65. GRB 130420A: Continued Skynet/GORT Observations/Detections
  66. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  67. GRB 130420A: Continued RATIR Optical and NIR Observations
  68. GRB 130420A: Continued RATIR Optical and NIR Observations
  69. GRB 130418A: Continued RATIR Optical and NIR Observations
  70. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  71. GRB 130418A: WSRT radio observation
  72. GRB 130420B: RATIR Optical and NIR Observations
  73. GRB 130420A: Continued RATIR Optical and NIR Observations
  74. GRB 130420A: ISON-NM optical observations
  75. Skynet/GORT observations of GRB130420A
  76. GRB 130420B: Weihai optical upper limit
  77. GRB 130420B: Swift/UVOT Upper Limits
  78. GRB130420B: GMG optical upper limit
  79. GRB 130420A: GMG optical observation
  80. GRB130420A : Xinglong TNT optical upper limit
  81. GRB 130420A: Weihai Optical Observations
  82. GRB 130420B: MASTER-Net optical observations
  83. GRB 130420A: T21 optical observations
  84. GRB 130420A: RATIR Optical and NIR Observations
  85. GRB 130420A: PAIRITEL NIR detections
  86. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  87. GRB 130420A: Swift detection of a burst with an optical counterpart
  88. GRB 130418A: Continued RATIR Optical and NIR Observations
  89. GRB 130418A: SMARTS optical/IR afterglow observations
  90. GRB 130418A: Submm observations from SMA
  91. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  92. Trigger 553930: Swift detection of a possible flare from HR 5110
  93. GRB 130418A: T21 optical observation
  94. GRB 130418A: T18 and T21 optical observations
  95. GRB130418A: VLT/X-shooter redshift confirmation
  96. GRB 130418A: REM NIR observations
  97. GRB 130418A: RATIR Optical and NIR Observations
  98. GRB 130418A: CARMA 3mm detection
  99. GRB 130418A: GROND detection of the optical-NIR afterglow
  100. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations

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