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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"

5543 results found.

  1. GRB 140304A: Afterglow decay from Nanshan observations
  2. GRB 140304A: MASTER OT detecton
  3. GRB 140302A: MITSuME Okayama upper limits
  4. GRB 140215A: MITSuME Okayama Optical Observation
  5. GRB140206A: Discovery Channel Telescope Optical Detection
  6. GRB 140211A: Swift detection of a burst
  7. GRB 140129B: MASTER OT early light curve
  8. GRB140129A: RAPTOR Observations of the Early Afterglow
  9. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  10. GRB 140129A: P60 optical afterglow detection
  11. GRB 140129A: Swift detection of a burst with an optical afterglow
  12. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  13. GRB 140118A: Swift detection of a burst
  14. GRB 140103A: optical upper limit
  15. GRB 140114A: NOT afterglow observations
  16. GRB 140103A: AAO optical afterglow candidate
  17. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  18. GRB 140110A: Swift XRT observations
  19. GRB 131231A: AAO optical observations
  20. LOAO R-band Observation of GRB 140102A
  21. GRB 131209A: Further Swift XRT observations
  22. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  23. GRB 140102A: P60 observations
  24. GRB 140102A: GROND observations
  25. GRB 131224B detected in ground analysis of Swift-BAT data
  26. GRB 131231A: P60 observations
  27. GRB 131231A: MDM afterglow observation
  28. GRB 131224A: Swift-XRT observation
  29. Trigger 581129: Swift-BAT triggered on noise
  30. GRB131202A : GROND observations
  31. GRB 131127B: rejection of optical counterpart candidates
  32. GRB 131126A: Fermi GBM observation
  33. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  34. GRB 131202A : XMM-Newton planned observation
  35. Konus-Wind observation of GRB 131126A
  36. IPN Triangulation of GRB 131126A (short/hard)
  37. IPN Triangulation of GRB 131127B
  38. Fermi407254341: iPTF optical afterglow candidates
  39. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  40. GRB 131108A: 1.23m CAHA optical candidate
  41. GRB 131105A: VLT/X-shooter redshift
  42. GRB 131105A: VLT/X-shooter optical afterglow candidate
  43. GRB 131031A: Swift-XRT observations
  44. GRB 131028A: Fermi GBM detection
  45. GRB 131018B: Swift-XRT observations
  46. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  47. GRB 131011A: GROND afterglow observations
  48. GRB 131004A: Swift detection of a burst (may be short)
  49. GRB 131002B: GROND upper limits
  50. GRB 131002A: ISON-NM optical observations
  51. GRB 131002A: Enhanced Swift-XRT position
  52. GRB 131002A: Swift detection of a burst
  53. GRB 131002A: Faulkes Telescope North optical afterglow
  54. GRB 130930A: Swift detection of a burst
  55. Fermi LAT Upper Limits on GRB 130925A
  56. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  57. GRB 130925A: Historical non-detection from Rosat-HRI
  58. Fermi GBM detection of GRB 130925A and a possible precursor
  59. GRB 130925A: MAXI/GSC detection
  60. GRB 130925A: Swift detection of a burst
  61. GRB 130831A: RTT150 optical observations
  62. GRB 130903A: optical observations
  63. GRB 130912A: AAO optical upper limit
  64. GRB 130606A: Chandra observation
  65. GRB 130912A: GROND observations
  66. GRB 130831A: Maidanak optical observations
  67. GRB 130822A: nearby galaxy redshifts
  68. GRB 130903A: MASTER early optical limit
  69. GRB 130903A: Fermi GBM observation
  70. GRB 130903A: GROND Upper Limits
  71. GRB 130816A: Swift/UVOT Upper Limits
  72. GRB 130807A: Swift-XRT refined analysis
  73. GRB 130807A, Swift-BAT refined analysis
  74. GRB 130803A; Fermi GBM observation
  75. GRB 130727A: Faulkes Telescope South optical afterglow
  76. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  77. GRB 130719A: Swift detection of a burst
  78. GRB 130716A: Probable short-hard burst with delayed Swift data
  79. GRB 130708A: Swift XRT and UVOT Observations
  80. GRB 130702A: NOT optical observations
  81. GRB 130702A / Fermi394416326 : Nanshan optical observations
  82. Fermi394416326: FTN detection
  83. Fermi394416326: iPTF detection of a possible optical afterglow
  84. GRB 130627A: Swift detection of a burst
  85. GRB 130626A: Swift detection of a short burst
  86. Swift Trigger 558828 is not an interesting event
  87. GRB 130610A: CrAO optical observations
  88. GRB 130612A: Fermi GBM observation
  89. GRB 130612A: Swift detection of a burst with an optical counterpart
  90. GRB 130610A: ISON-NM optical observations
  91. GRB 130610A: Fermi GBM Observation
  92. GRB 130609B: Swift/UVOT Observations
  93. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  94. GRB 130610A: Swift detection of a burst with an optical counterpart
  95. GRB 130609B: Swift detection of a burst with an optical counterpart
  96. GRB 130609A: Fermi GBM observation
  97. GRB 130609A: P60 nondetection
  98. GRB 130609A: Swift detection of a burst
  99. Swift Trigger 557674 was due to an onboard position error
  100. GRB 130603A: AAO optical observations

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