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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

32538 results found.

  1. GRB 080702B: Swift XRT and UVOT observations
  2. GRB 080625: Suzaku WAM observation of the prompt emission
  3. GRB 080702A: MITSuME Akeno optical upper limits
  4. GRB 080701A: Early RAPTOR optical limits
  5. Swift Trigger 315630: Swift/UVOT Upper Limits
  6. GRB 080702A, Swift-BAT refined analysis
  7. GRB 080702A: Swift-XRT Team refined analysis
  8. Swift Trigger 315630: TLS R-band observation
  9. Swift Trigger 315630: Probably not a GRB
  10. GRB 080701: Swift-XRT refined analysis
  11. GRB 080701A, VATT optical upper limit
  12. TLS I-Band Observation of GRB 080701A
  13. GRB 080701A: Swift/UVOT Upper Limits
  14. GRB 080701A: Early Super-LOTIS Observations
  15. GRB 080701A, Swift-BAT refined analysis
  16. GRB 080623: Suzaku WAM observation of the prompt emission
  17. GRB 080625: Swift/UVOT Follow-Up Observations
  18. GRB 080625: Further observations from OSN
  19. GRB 080625:Swift-XRT detection of the afterglow
  20. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  21. GRB 080625: Observations at OSN
  22. GRB 080623: GROND upper limits
  23. GRB080623: Swift UVOT followup observations
  24. GRB 080623: Swift-XRT refined analysis
  25. GRB 080623, Swift-BAT refined analysis
  26. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  27. Swift trigger 314975 is not a GRB
  28. GRB080607: optical observation
  29. GRB 080603b: optical observation
  30. GRB 070809: Putative host galaxy and redshift
  31. VLA upper limit on INTEGRAL burst GRB 080613A
  32. GRB 0800603A: optical observation
  33. GRB080613B: MITSuME upper limits
  34. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  35. Konus-Wind observation of GRB 080613B
  36. GRB 080603A: optical observations on June 04
  37. GRB 080613A: Swift-XRT detection of the afterglow
  38. GRB080613A: Swift/UVOT Upper Limits
  39. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  40. GRB 080613B: GROND Upper Limits
  41. GRB 080613B - NOT optical and IR nondetections
  42. GRB080613B: Swift/UVOT Upper Limits
  43. GRB 080613B, Swift-BAT refined analysis
  44. GRB 080613B: Swift-XRT refined analysis
  45. GRB 080514B: Spectroscopic constraints and probable host galaxy
  46. GRB 080613: Faulkes Telescope North optical candidate
  47. GRB 080603A: Late-time Keck imaging and spectroscopy
  48. GRB 080603b: optical observation
  49. Swift observations of BAT Slew Survey event (Trigger=010)
  50. GRB 080603A: final Swift-XRT observations.
  51. GRB 080607: AGILE-MCAL observation of the prompt emission
  52. GRB 080603B - TLS 2nd Epoch: Another Break
  53. GRB 080605: TLS 3rd Epoch - Source Confusion
  54. GRB080605: optical observation with the MITSuME-OAO telescope
  55. Konus-Wind observation of GRB 080607
  56. GRB080607: RTT150 optical observations
  57. GRB 080603A: optical observations
  58. GRB 080607: Swift-XRT refined analysis
  59. Swift/UVOT Observations of GRB080607
  60. GRB 080605: optical observations
  61. GRB 080607 KAIT observations
  62. VLA detection of INTEGRAL burst GRB 080603A
  63. Konus-Wind observation of GRB 080605
  64. GRB 080607, Swift-BAT refined analysis
  65. GRB 080605: GROND 2nd epoch observations
  66. GRB 080607 - PAIRITEL NIR detection
  67. GRB 080607: Keck/LRIS spectroscopy and redshift
  68. GRB 080607: Super-LOTIS early observations
  69. GRB 080607: ROTSE-III Detection of Optical Counterpart
  70. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  71. GRB 080605: Swift-UVOT refined analysis
  72. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  73. GRB 080604: VLA radio upper limit
  74. GRB 080605, Swift-BAT refined analysis
  75. GRB 080603B: VLA radio upper limit
  76. GRB 080605, Swift-BAT refined analysis
  77. GRB 080605: Swift-XRT refined analysis
  78. GRB080605: observation by BOOTES
  79. GRB 080605: MASTER VWF 46 s AT observation
  80. GRB 080605: GROND detection of the optical afterglow candidate
  81. GRB080605: optical observations
  82. GRB 080605: VLT redshift
  83. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  84. GRB 080605: TLS RRM Afterglow
  85. GRB 080603B: PAIRITEL infrared detection
  86. GRB 080603A: PAIRITEL infrared detection
  87. GRB 080604: Xinglong R band observation
  88. GRB 080603A: Xinglong R band observation
  89. GRB 080603B: TLS Afterglow Observation
  90. GRB 080603A: TLS Afterglow Observation
  91. Swift/UVOT observations of GRB080604
  92. GRB080604: HET redshift retraction
  93. GRB 080604: Gemini-North spectroscopy
  94. GRB 080604, Swift-BAT refined analysis
  95. GRB 080604: Swift-XRT refined analysis
  96. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  97. GRB 080603B : Xinglong EST observations
  98. GRB 080603B : Liverpool Telescope Observations
  99. Konus-Wind observation of GRB 080603B
  100. GRB 080603B: Swift-XRT refined analysis

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