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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"
  1. Swift/UVOT observation of GRB080702A
  2. GRB 080702B: Swift XRT and UVOT observations
  3. GRB 080625: Suzaku WAM observation of the prompt emission
  4. GRB 080702A: MITSuME Akeno optical upper limits
  5. GRB 080701A: Early RAPTOR optical limits
  6. Swift Trigger 315630: Swift/UVOT Upper Limits
  7. GRB 080702A, Swift-BAT refined analysis
  8. GRB 080702A: Swift-XRT Team refined analysis
  9. GRB 080702B : Burst detected in BAT during Swift slew
  10. GRB 080702A: Enhanced Swift-XRT position
  11. Swift Trigger 315630: TLS R-band observation
  12. Swift Trigger 315630: Probably not a GRB
  13. GRB 080702: Swift detection of a short burst
  14. GRB 080701: Swift-XRT refined analysis
  15. GRB 080701A, VATT optical upper limit
  16. TLS I-Band Observation of GRB 080701A
  17. GRB 080701A: Swift/UVOT Upper Limits
  18. GRB 080701A: Early Super-LOTIS Observations
  19. GRB 080701: Enhanced Swift-XRT position
  20. GRB 080701A, Swift-BAT refined analysis
  21. Trigger 315630: Swift detection of a possible burst
  22. GRB 080701: Swift-XRT Prompt Analysis
  23. GRB 080701: Swift detection of a burst
  24. GRB 080623: Suzaku WAM observation of the prompt emission
  25. GRB 080625: Swift/UVOT Follow-Up Observations
  26. GRB 080625: Further observations from OSN
  27. GRB 080625:Swift-XRT detection of the afterglow
  28. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  29. GRB 080625: Observations at OSN
  30. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  31. GRB 080623: GROND upper limits
  32. GRB080623: Swift UVOT followup observations
  33. GRB 080623: Swift-XRT refined analysis
  34. GRB 080623, Swift-BAT refined analysis
  35. GRB 080623: Enhanced Swift-XRT position
  36. GRB 080623: TAROT La Silla observatory optical observations
  37. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  38. GRB 080623: Swift XRT prompt analysis
  39. GRB 080623: Swift detection of a burst
  40. Swift trigger 314975 is not a GRB
  41. Swift-BAT trigger 314975 possible burst
  42. GRB080607: optical observation
  43. GRB 080603b: optical observation
  44. GRB 070809: Putative host galaxy and redshift
  45. VLA upper limit on INTEGRAL burst GRB 080613A
  46. GRB 0800603A: optical observation
  47. GRB080613B: MITSuME upper limits
  48. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  49. Konus-Wind observation of GRB 080613B
  50. GRB 080603A: optical observations on June 04
  51. GRB 080613A: Swift-XRT detection of the afterglow
  52. GRB080613A: Swift/UVOT Upper Limits
  53. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  54. GRB 080613B: GROND Upper Limits
  55. GRB 080613B - NOT optical and IR nondetections
  56. GRB080613B: Swift/UVOT Upper Limits
  57. GRB 080613B, Swift-BAT refined analysis
  58. GRB 080613B: Swift-XRT refined analysis
  59. GRB 080514B: Spectroscopic constraints and probable host galaxy
  60. GRB 080613B: Swift detection of a burst
  61. GRB 080613: Faulkes Telescope North optical candidate
  62. GRB 080613 : a long GRB detected with INTEGRAL
  63. GRB 080603A: Late-time Keck imaging and spectroscopy
  64. GRB 080603b: optical observation
  65. Swift observations of BAT Slew Survey event (Trigger=010)
  66. GRB 080603A: final Swift-XRT observations.
  67. GRB 080607: AGILE-MCAL observation of the prompt emission
  68. GRB 080603B - TLS 2nd Epoch: Another Break
  69. GRB 080605: TLS 3rd Epoch - Source Confusion
  70. GRB080605: optical observation with the MITSuME-OAO telescope
  71. Konus-Wind observation of GRB 080607
  72. GRB080607: RTT150 optical observations
  73. GRB 080603A: optical observations
  74. GRB 080607: Swift-XRT refined analysis
  75. Swift/UVOT Observations of GRB080607
  76. GRB 080605: optical observations
  77. GRB 080607 KAIT observations
  78. VLA detection of INTEGRAL burst GRB 080603A
  79. Konus-Wind observation of GRB 080605
  80. GRB 080607: Enhanced Swift-XRT position
  81. GRB 080607, Swift-BAT refined analysis
  82. GRB 080605: GROND 2nd epoch observations
  83. GRB 080607 - PAIRITEL NIR detection
  84. GRB 080607: Keck/LRIS spectroscopy and redshift
  85. GRB 080607: Super-LOTIS early observations
  86. GRB 080607: Swift detection of a burst with optical afterglow
  87. GRB 080607: ROTSE-III Detection of Optical Counterpart
  88. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  89. GRB 080605: Swift-UVOT refined analysis
  90. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  91. GRB 080604: VLA radio upper limit
  92. GRB 080605, Swift-BAT refined analysis
  93. GRB 080603B: VLA radio upper limit
  94. GRB 080605, Swift-BAT refined analysis
  95. GRB 080605: Swift-XRT refined analysis
  96. GRB080605: observation by BOOTES
  97. GRB 080605: MASTER VWF 46 s AT observation
  98. GRB 080605: Enhanced Swift-XRT position
  99. GRB 080605: GROND detection of the optical afterglow candidate
  100. GRB080605: optical observations

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