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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"

38679 results found.

  1. IBAS Alert n.4637: not a GRB
  2. GRB 070612A: Second Epoch WSRT Radio Observations
  3. GRB070621: RTT150 optical observations
  4. GRB 070621: VLT optical observations
  5. GRB 070621: Swift/UVOT Upper Limits
  6. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  7. WHT observations of GRB070621
  8. GRB070621: Swift XRT refined analysis
  9. GRB 070621: Gemini South optical imaging
  10. GRB 070621: UVOT-enhanced XRT position
  11. Observations of GRB070612A at Calar Alto
  12. GRB 070621: NOT observations
  13. GRB 070621: Watcher Observations
  14. GRB 070621: ROTSE-III Prompt Optical Limits
  15. GRB 070621: Swift detection of a burst
  16. GRB 070612A: TNG optical observations
  17. Swift/UVOT detection of GRB070616 optical afterglow.
  18. GRB070612A: Gemini Spectroscopic Redshift
  19. GRB 070612A: NOT observations
  20. GRB070616: Optical Observation by MITSuME Akeno
  21. GRB 070612B: Optical Observation by MITSuME Akeno
  22. GRB070616: Optical Observation by MITSuME Okayama
  23. GRB 070616, Swift-BAT further refined analysis
  24. GRB 070616: Swift XRT refined circular
  25. GRB 070612A: Possible WSRT Radio Detection
  26. GRB 070616: BTA astrometry and finding chart
  27. Swift/UVOT observations of GRB070616
  28. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  29. GRB 070616: Swift detection of a burst
  30. UVOT Observations of INTEGRAL burst GRB070615
  31. VLA upper limit on GRB 070610
  32. GRB 070615
  33. GRB 070615: A long GRB detected by INTEGRAL
  34. SWIFT J195509.6+261406 (GRB 070610): further observations
  35. GRB 070612A: Super-LOTIS observations
  36. GRB 070612A: Rapid Decay
  37. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  38. GRB070612A: MITSuME Okayama Observation
  39. GRB 070611: Watcher Observations
  40. Swift Trigger 282176 is Cygnus X-1
  41. GRB 070612A: MDM Observations
  42. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  43. GRB 070612B: Swift-XRT refined analysis
  44. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  45. GRB 070612B: Swift/UVOT upper limits
  46. GRB 070612B: FRAM limit
  47. GRB070612B: P60 Observations
  48. GRB 070612B: KAIT limits
  49. GRB 070612B: Swift XRT position from downlink data
  50. GRB 070610: MITSuME OAO optical upper limit
  51. GRB 070612B: Swift detection of a burst
  52. GRB070612 - SDSS Pre-Burst Observations
  53. GRB 070612: Swift detection of a burst
  54. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  55. GRB 070610: SARA upper limit
  56. GRB 070610: Swift-XRT refined analysis
  57. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  58. GRB 070611: Swift/UVOT Observations
  59. GRB 070611: Swift-XRT refined analysis
  60. GRB 070610: Optical observations from OSN
  61. GRB 070610: Watcher Observations
  62. GRB 070611: VLT redshift
  63. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  64. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  65. GRB 070611; Swift-XRT position
  66. GRB 070611: ROTSE-III Optical Limits
  67. GRB 070611: Swift detection of a burst
  68. GRB 070610: Swift-UVOT Upper Limits
  69. GRB 070610; Swift-XRT position
  70. GRB 070610: Swift detection of a burst
  71. GRB 070419A, deep LBT photometry and possible supernova detection
  72. GRB070520B: optical observations
  73. GRB070520: optical observation
  74. GRB070518: optical observation
  75. GRB070521: optical observation
  76. Swift/UVOT refined analysis of GRB070531
  77. GRB 070531: NOT nIR observations
  78. GRB 070531: I-band observations from IAC80
  79. GRB 070531: Swift-XRT position
  80. GRB 070531: Swift detection of a burst
  81. GRB 070529: SARA upper limit
  82. Swift/UVOT refined analysis of GRB070529
  83. GRB 070529: MARGE Observations
  84. GRB 070529: Optical aterglow from MIRO
  85. GRB 070529: Gemini Redshift
  86. GRB 070529: Swift-XRT refined analysis
  87. GRB 070529, Swift-BAT refined analysis
  88. GRB 070529: Xinglong TNT Optical Upper Limit
  89. GRB 070529: Swift detection of a burst with an optical aterglow
  90. GRB 070412: Deep Keck imaging
  91. Swift Triggers 280447, 280450 and 280451 are invalid
  92. Swift trigger 280447 is probably a Galactic transient
  93. GRB 070518, deep LBT photometry
  94. GRB 070518: MARGE Observations
  95. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  96. Konus-Wind observation of GRB 070521
  97. GRB 070518: optical observation
  98. GRB070521: Second Epoch Gemini Imaging
  99. GRB070521: NIR observations
  100. GRB070520B: NIR observations

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