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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"

21022 results found.

  1. ATCA observation of SGR J1550-5418
  2. GRB 090306B: Possible XRT afterglow
  3. GRB 090307: Swift-BAT refined analysis of trigger 345551
  4. GRB 090305: Magellan confirmation of the optical afterglow
  5. GRB090305: GMOS-S Candidate Optical Afterglow
  6. SGR J1550-5418
  7. GRB 081211B: Nearby cluster
  8. GRB 090207 - Fermi GBM Observations
  9. GRB 090205: VLT optical decay
  10. GRB 090205: Swift/UVOT Upper Limits
  11. GRB 090205: GROND observations and photometric redshift estimate
  12. GRB 090205: VLT candidate afterglow
  13. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  14. GRB090201: Swift UVOT upper limits
  15. GRB 090201: object inside the enhanced XRT error circle
  16. GRB 090201: VLT NIR observations
  17. GRB 090201: VLT afterglow candidate
  18. GRB090113: MAGIC telescope GeV observation
  19. Suzaku ToO Observation of AXP 1E 1547.0-5408
  20. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  21. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  22. GRB 090102: HST observations and host galaxy
  23. GRB 090118: no afterglow candidate
  24. 1E1547.0-5408: Swift detection of dust halo
  25. GRB 090123: Swift/UVOT Observations
  26. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  27. AXP 1E1547.0-5408: Fermi GBM observations
  28. GRB 090118: KPNO 4m 2nd Epoch Observations
  29. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  30. GRB 090118: Swift-XRT observations
  31. GRB090118 Swift/UVOT upper limits
  32. GRB 090118: GROND Upper Limits
  33. GRB 090117 - Fermi GBM Observations
  34. GRB 090117: GROND Upper Limits
  35. GRB090102: MAGIC telescope GeV observation
  36. GRB 090113: Swift UVOT upper limits
  37. GRB 090113: GROND Upper Limits
  38. GRB 090113: Observations from NOT
  39. GRB 090111: Swift UVOT Upper Limits
  40. GRB 090102: WSRT Radio Observations
  41. GRB 090107B: Swift XRT afterglow confirmation
  42. GRB 090107B: Swift/UVOT Observations
  43. GRB 090107B: Swift-XRT detection of possible afterglow
  44. GRB 090107B optical observations
  45. GRB 090102: optical decay
  46. GRB 090102: P60 Imaging and P200 Spectroscopy
  47. GRB 090102 Observations from IAC80
  48. GRB 090102: GROND observations of the optical afterglow
  49. Swift UVOT observations of GRB 090102
  50. GRB 090102: TAROT Calern observatory optical light curve
  51. GRB 090102: REM observations of a bright afterglow
  52. GRB 090102: TAROT Calern observatory optical observations
  53. GRB 081230: GROND confirmation of the afterglow
  54. GRB081230: Swift-XRT refined analysis
  55. GRB 081230 Swift/UVOT Observations
  56. GRB 081230: ROTSE-III Detection of Optical Counterpart
  57. GRB 081228: Swift/UVOT Upper Limits
  58. GRB 081228: detection by GROND
  59. GRB 081228: TAROT Calern observatory optical observations
  60. GRB 081226: Swift-XRT refined analysis
  61. GRB 081226A: Swift UVOT Upper Limits
  62. GRB 081226: Gemini-South spectrum of possible afterglow
  63. GRB 081226: Gemini-South imaging
  64. GRB 081226: GROND afterglow candidate
  65. GRB 081226: Swift detection of a possible short-hard burst
  66. GRB 080810: optical observations
  67. GRB 081211B: optical observations
  68. GRB 081224: Fermi GBM Detection & LAT Localization
  69. GRB 080810: optical observations
  70. GRB 081221: GROND observations
  71. GRB 081222: Gemini-N confirmation of redshift z=2.77
  72. GRB 081222: Gemini-South absorption redshift
  73. GRB081222: Swift/UVOT further observations
  74. GRB081221: Fermi GBM observation
  75. Swift/UVOT observations of GRB 081221
  76. GRB 081222: Faulkes Telescope South observations
  77. GRB 081221: Gemini-N nIR imaging
  78. GRB081222: Swift/UVOT detection of an optical afterglow
  79. GRB081203A: BTA observation
  80. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  81. GRB081222: REM candidate afterglow
  82. GRB 081221: further NOT observations
  83. GRB 081221: NOT observations
  84. GRB081215A: Fermi-LAT observations
  85. GRB 081118: Zadko observations
  86. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  87. GRB 0811215A: MASTER prompt optical observations
  88. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  89. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  90. GRB 081210: optical observations
  91. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  92. GRB 081210: Xinglong TNT R band Upper Limits
  93. GRB 081210, SMARTS optical/IR observations
  94. GRB 081211: Swift XRT refined analysis
  95. GRB081203B: optical observations
  96. GRB 081203A: optical observations
  97. GRB 081128: afterglow observations
  98. GRB 081203B: Additional Gemini imaging
  99. GRB 081203B: Gemini observations
  100. GRB081203A: Optical observations at Ishigaki

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