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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"

16145 results found.

  1. GRB 141031B: TShAO optical upper limit
  2. GRB 141031A: Skynet PROMPT-CTIO Observations
  3. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  4. GRB 141031A: VLT/X-shooter optical observations
  5. GRB 141031B: Nanshan optical upper limit
  6. GRB 141031B: MASTER early optical observations
  7. GRB 141031A: GROND detection of a possible optical afterglow candidate
  8. GRB 141029A: Nanshan optical upper limit
  9. GRB 141028A: SAO RAS Zeiss-1000 photometry
  10. GRB 140509A: GROND afterglow detection
  11. GRB 141028A: P60 Observations and Decay Index
  12. GRB 141028A: Swift-XRT observations
  13. GRB 141028A: LCOGTN observations
  14. GRB 141028A: VLT/X-shooter redshift of z=2.33
  15. GRB 141028A: RATIR Optical and NIR Observations
  16. GRB 141028A: Swift/UVOT Detection
  17. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  18. GRB 141020A: Continued Mondy Observations, optical upper limit
  19. GRB 141026A: IRAM 30m millimetre observations
  20. GRB 141026A: Continued RATIR Optical and NIR Observations
  21. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  22. GRB 141026A: SAO RAS Zeiss-1000 observations
  23. GRB 141026A: Continued RATIR Optical and NIR Observations
  24. GRB 141026A: Swift/UVOT Upper Limits
  25. GRB 141004A: Continued RATIR Late Time Optical and NIR Observations
  26. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  27. GRB 141026A: MASTER early optical observations
  28. GRB141026A: Deep P200 optical imaging
  29. GRB 141026A: 1.23m CAHA I-band observations
  30. GRB 141026A: GROND observations
  31. GRB 141026A: RATIR Optical Observations
  32. GRB 141020A: AAO optical upper limit
  33. GRB 141020A: Khureltogot optical upper limit
  34. GRB 141022A: Swift/UVOT Upper Limits
  35. GRB 141020A: Mondy optical observations
  36. GRB141015A iTelescope observation
  37. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  38. GRB 141004A: RATIR Late Time Optical and NIR Observations
  39. GRB 141004A: La Palma late-time observations and possible brightening
  40. GRB 141020A: Swift detection of a burst with an optical counterpart
  41. GRB 141015A: MITSuME Akeno upper limits
  42. GRB 141017A: Zadko observatory - Gingin optical observations
  43. GRB 141015A: Swift/UVOT Upper Limits
  44. GRB 141015A: MITSuME Okayama upper limits
  45. GRB 141015A: RATIR Optical Upper Limits
  46. GRB 141015A: ISON-NM early optical observations
  47. Trigger 614903: Swift detection of IGR J17544-2619
  48. GRB 141005A: iTelescope.Net T21 Optical Observation
  49. GRB141004A: Host galaxy redshift form GTC
  50. GRB 141005A: Additional P60 imaging and afterglow confirmation
  51. GRB 141005A: Swift/UVOT Upper Limits
  52. GRB141004A: NOT imaging and spectroscopy
  53. GRB 141004A: Swift/UVOT Detection
  54. GRB 141004A: RATIR Optical Observations
  55. GRB 141004A: Monte Agliale Observatory optical observations
  56. GRB 141005A: RATIR Optical Observations
  57. GRB 141005A: P60 probable afterglow deteaction
  58. GRB 141004A: TNG photometric and spectroscopic observations
  59. GRB 141004A: 1.23m CAHA optical observations
  60. GRB 141004A: Swift detection of a burst with an optical counterpart
  61. Swift observations of HD 305560
  62. GRB 140928A: Swift-XRT follow-up observations
  63. Swift possible detection of the Be star HD 305560
  64. GRB 140930B: Gemini South Spectroscopy
  65. GRB 140930A/MAXI J2259+524: MASTER optical observations
  66. GRB 140930B: Swift/UVOT Upper Limits
  67. GRB 140930B: MMT confirmation of the optical afterglow
  68. GRB 140930B: ISON-Kislovodsk observations
  69. GRB 140930B: 1.23m CAHA optical observations
  70. GRB 140930B: MASTER early optical observations
  71. GRB 140928A: LCO-Cerro Tololo further observations
  72. GRB 140928A: LCO-Cerro Tololo observations
  73. GRB 140928A: GROND Afterglow Candidate
  74. GRB 140919A: Swift/UVOT Detection
  75. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  76. Swift detection of outburst from 4U 1700+24
  77. GRB 140916A: Swift/UVOT Upper Limits
  78. GRB 140916A: MITSuME Okayama upper limits
  79. GRB 140916B: iPTF Optical Observations
  80. GRB 140916A: FTS observations
  81. GRB 140907A: Continued DCT Observations
  82. GRB 140907A: Mondy optical observations
  83. GRB 140903A: Chandra detection of the afterglow
  84. GRB 140909A: Swift/UVOT Upper Limits
  85. GRB 140907A: 1.23m CAHA optical observations
  86. GRB 140907A: MASTER optical observations
  87. GRB 140907A: MITSuME Akeno Optical Observation
  88. GRB 140907A: Discovery Channel Telescope observations
  89. GRB 140907A: redshift from the 10.4m GTC telescope
  90. GRB 140907A: MITSuME Ishigakijima Optical Observation
  91. GRB140907A: MITSuME Okayama Optical Observation
  92. GRB 140907A : Virtual Telescope optical observations
  93. GRB140907A: Swift UVOT detection
  94. GRB 140907A : Optical observations from Nanshan
  95. GRB 140907A: Swift detection of a burst with an optical counterpart
  96. GRB 140906A - Fermi GBM Detection
  97. GRB 140906A: iPTF optical transient candidates
  98. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  99. GRB 140903A: Possible optical variability
  100. GRB 140903A: NOT optical and NIR observations

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