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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"

21089 results found.

  1. GRB061121A: PROMPT Observations
  2. GRB070805 XRT and UVOT afterglow candidate
  3. Swift/UVOT observations of GRB070805
  4. UVOT observations of SAXJ1810.8-2609
  5. GRB 070802: REM optical observations
  6. GRB 070724B: Swift-XRT afterglow confirmation
  7. GRB070802: Swift/UVOT upper limits
  8. GRB 070802: Confirmation of the optical afterglow
  9. GRB 070802: GROND J band candidate
  10. GRB 070802: LCO optical observations
  11. GRB 070729: LCO optical imaging
  12. GRB070729: Swift/UVOT upper limits
  13. GRB 070729: Magellan NIR Observations
  14. GRB 070724B: P60 Observations
  15. GRB 070724B: Swift/UVOT Upper limits
  16. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  17. GRB 070724B: Swift-XRT afterglow likely candidate
  18. GRB 070721A: optical observations
  19. GRB 070724A: further VLT observations
  20. Four radio sources in Swift-XRT error box of GRB 070724
  21. GRB 070724: optical observations
  22. GRB070724: Host galaxy redshift
  23. GRB 070724: P60 and Gemini Observations
  24. GRB 070724: IR observations
  25. Short-Hard GRB070714B: PROMPT Observations
  26. GRB 070721B: further observations and analysis
  27. GRB 070714B: Keck observations
  28. GRB 070721B: optical observations and proposed redshift
  29. Swift/UVOT observations of GRB070721B optical afterglow.
  30. Swift/UVOT Observations of GRB070721A
  31. GRB 070721B : Faulkes Telescope South observations
  32. GRB070714B: TNG NIR observations
  33. GRB 070714A: Swift/UVOT Upper limits
  34. GRB 070714B: Swift/UVOT Upper Limits
  35. GRB 070714B: confirmation of optical afterglow
  36. GRB 070707: Swift-XRT follow-up observations
  37. SN 2007bg - off-axis GRB?
  38. GRB 070704: RTT150 optical observations
  39. GRB 070707: optical afterglow
  40. GRB 070707: object inside XRT error circle
  41. Swift/UVOT Observations of GRB070707
  42. GRB 070707: VLT observations
  43. GRB 070429B: NIR Observations
  44. GRB070704: FAVOR optical observations
  45. GRB 070704 : Liverpool Telescope Observations
  46. GRB 070611: VLT observations
  47. Swift/UVOT Observations of GRB070704
  48. GRB 070628 Swift-UVOT Refined Analysis
  49. GRB 070628: NIR detection of afterglow
  50. GRB 070628: TAROT La Silla observatory optical observations
  51. GRB 070628: Watcher Observations
  52. Swift UVOT Observations of GRB 070628
  53. GRB 070628: Swift detection of a possible burst
  54. GRB 070612A: Allen Telescope Array Observations
  55. OT20050728 was not an optical GRB afterglow
  56. INTEGRAL burst GRB070615: X-ray continued observations
  57. GRB 070616 : WIDGET simultaneous optical observations
  58. GRB 070612A: Second Epoch WSRT Radio Observations
  59. GRB070621: RTT150 optical observations
  60. GRB 070621: VLT optical observations
  61. GRB 070621: Swift/UVOT Upper Limits
  62. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  63. WHT observations of GRB070621
  64. GRB 070621: Gemini South optical imaging
  65. Observations of GRB070612A at Calar Alto
  66. GRB 070621: NOT observations
  67. GRB070621: OPTIMA-Burst optical upper limit
  68. GRB 070621: TAROT Calern observatory optical observations
  69. GRB 070621: Watcher Observations
  70. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  71. GRB 070612A: TNG optical observations
  72. Swift/UVOT detection of GRB070616 optical afterglow.
  73. GRB070612A: Gemini Spectroscopic Redshift
  74. GRB 070612A: NOT observations
  75. GRB 070612A: Possible WSRT Radio Detection
  76. GRB 070616: BTA optical observations
  77. Swift/UVOT observations of GRB070616
  78. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  79. GRB 070612B: optical observations
  80. UVOT Observations of INTEGRAL burst GRB070615
  81. GRB 070615
  82. SWIFT J195509.6+261406 (GRB 070610): further observations
  83. GRB 070612A: Super-LOTIS observations
  84. GRB 070612A: Rapid Decay
  85. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  86. GRB070612A: MITSuME Okayama Observation
  87. GRB 070612A: continued SARA observations
  88. GRB 070611: Watcher Observations
  89. GRB 070612A: MDM Observations
  90. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  91. GRB 070612B: SARA upper limit
  92. GRB 070612B: Swift-XRT refined analysis
  93. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  94. GRB 070612B: Swift/UVOT upper limits
  95. GRB070612B: P60 Observations
  96. GRB 070612B: KAIT limits
  97. GRB 070612A: SARA detection of possible OT
  98. GRB 070610: TAROT Calern observatory optical observations
  99. GRB070612 - SDSS Pre-Burst Observations
  100. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity

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