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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"

16126 results found.

  1. GRB 140206A: ISON-Ussuriysk optical observations
  2. GRB 140206A: Nanshan optical observations
  3. GRB 140206A: MASTER OT detection
  4. GRB 140206A: Swift/UVOT optical detection
  5. GRB140206A - Optical afterglow candidate
  6. GRB 140129A: 5 GHz VLA observations
  7. GRB 140129A: Continued RATIR Optical and NIR Observations
  8. GRB 140129A: Khureltogot optical limit
  9. GRB 140129A: Continued RATIR Optical and NIR Observations
  10. GRB 140102A: MITSuME Akeno Optical observation
  11. GRB 140129B: MASTER OT early light curve
  12. GRB 140129A: CARMA early observations
  13. GRB 140129A: P200 spectroscopy
  14. GRB140129A: RAPTOR Observations of the Early Afterglow
  15. GRB 140129A: MITSuME Okayama upper limits
  16. GRB 140129B: MASTER OT confirmation
  17. GRB 140129B: Swift detection of a burst with an optical afterglow
  18. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  19. GRB 140129A: RATIR Optical and NIR Observations
  20. GRB 140129A: P60 optical afterglow detection
  21. GRB 140129A: Swift detection of a burst with an optical afterglow
  22. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  23. Fermi412093190: iPTF optical counterpart search
  24. GRB 140114A: optical upper limit
  25. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  26. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  27. GRB 140118A: RATIR Optical and NIR Observations
  28. Swift Trigger 584155 is MAXI J1421-613
  29. GRB 140103A: MASTER-Net early OT detection
  30. GRB 140103A: optical upper limit
  31. GRB 140108A: Mondy optical observations, refined analysis
  32. GRB 140114A: NOT afterglow observations
  33. GRB 140114A: Continued RATIR Optical and NIR Observations
  34. GRB 140114A: MITSuME Okayama upper limits
  35. GRB 140114A: ROTSE-III Optical Limits
  36. GRB 140114A: Swift/UVOT Upper Limits
  37. GRB 140114A: KAIT Optical Upper Limit
  38. GRB 140103A: AAO optical afterglow candidate
  39. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  40. GRB 140102A: AAO optical upper limits
  41. GRB 140108A: Konkoly optical observations
  42. GRB 140110A: Swift/UVOT retraction of UVOT candidates
  43. GRB 140110A: Reported UVOT OT not GRB afterglow
  44. GRB 140110A: OT detection in Swift/UVOT imaging
  45. GRB 140108A: Mondy optical upper limit
  46. GRB 140105A: MASTER-Net early optical observations and time correction
  47. GRB 131231A: AAO optical observations
  48. GRB 140108A: Swift/UVOT Detection
  49. GRB 140108A: Mondy optical observations
  50. GRB 140108A: D50+BART optical candidate detection
  51. GRB 140108A: 1.23m CAHA observations
  52. GRB 140108A: MASTER-Net OT detection
  53. GRB 140105A: HCT Observations
  54. GRB 140105A: continued iPTF observations and rejection of optical candidates
  55. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  56. LOAO R-band Observation of GRB 140102A
  57. GRB 140105A: Fermi GBM detection
  58. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  59. GRB 140102A: BOOTES-4 early optical observations
  60. GRB 140103A: Lulin Optical r-band Observations
  61. GRB 131231A : Lulin Optical Observations
  62. GRB 131231A: CARMA 3mm detection
  63. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  64. GRB 140102A, Optical Observations
  65. GRB 131231A, Optical Observations
  66. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  67. GRB 140103A: Swift/UVOT Upper Limits
  68. GRB 140102A: GROND observations
  69. GRB 140103A: MASTER-Net optical observations
  70. GRB 140102A: I-band observations from IAC80 and 1.23m CAHA telescopes
  71. GRB 140102A: Early optical observations from Nanshan
  72. GRB 140102A: Swift detection of a burst with optical counterpart
  73. GRB 131231A: Swift-XRT observations
  74. GRB 131231A : xinglong TNT optical observation
  75. GRB 131231A: VLT/X-shooter redshift
  76. GRB 131231A: Fermi GBM detection
  77. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  78. GRB 131231A: afterglow confirmation from the NOT
  79. GRB 131229A: GROND observations
  80. GRB 131229A: Swift/UVOT Upper Limits
  81. GRB 131227A: GROND Upper Limits
  82. GRB 131229A: KAIT Optical Upper Limit
  83. GRB 131227A: P60 Limits
  84. GRB 131227A: Xinglong optical observations
  85. GRB 131227A: Swift/UVOT Upper Limits
  86. GRB 131227A: OT candidate from KAIT Optical observations
  87. GRB 131224A: Swift/UVOT Upper Limits
  88. GRB 131225A: MASTER-Net optical observations
  89. GRB 131224A: MASTER-Net early optical observations
  90. GRB 131218A: GROND Upper Limits
  91. GRB 131218A: Swift XRT and UVOT observations
  92. GRB 131218A: Zadko observatory - Gingin optical candidate
  93. GRB 131218A: TAROT La Silla observatory optical observations
  94. GRB 131205A: GROND confirmation of afterglow
  95. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  96. GRB 131205A: Swift/UVOT Upper Limits
  97. GRB 131205A: Zadko observatory - Gingin optical observations
  98. GRB 131127B: Bassano Bresciano Observatory,archival confirmation of iPTF13ecv
  99. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  100. GRB 131127B: rejection of optical counterpart candidates

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