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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"

16157 results found.

  1. Observations of possible TAROT GRB transient near IC 4779
  2. Candidate Orphan GRB Optical Transient in IC 4779
  3. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  4. GRB070810b: optical candidate
  5. GRB 070810A: ROTSE-III Refined Analysis
  6. GRB 070810A: Continued Keck Imaging
  7. GRB 070810B: Keck spectroscopy of possible host galaxies
  8. GRB 070810: MASTER optical observation
  9. GRB 070809: Swift/UVOT Corrected Photometry
  10. Swift Alert 070810.8: MASTER optical observation
  11. GRB 070810A: Swift-BAT refined analysis
  12. GRB 070810B: Xinglong TNT optical Upper Limit
  13. GRB070810B: Optical observations with KANATA
  14. GRB 070810: Swift/UVOT Optical Counterpart
  15. GRB 070810: ROTSE-III Detection of Optical Counterpart
  16. GRB 070809: Optical Pre-imaging from Palomar
  17. GRB 070809: ROTSE-III Optical Limits
  18. GRB 070809: Swift detection of a short burst
  19. GRB 070808: OPTIMA-Burst optical upper limit
  20. GRB 070808: Xinglong TNT optical Upper Limit
  21. GRB070808: Optical observations with KANATA
  22. GRB 070808: ROTSE-III Optical Limits
  23. GRB070612A: Radio upper limit from GMRT
  24. GRB 070802: REM optical observations
  25. GRB 070802: Swift-XRT refined analysis
  26. GRB 070802: Confirmation of the optical afterglow
  27. GRB 070802: LCO optical observations
  28. GRB 070729: LCO optical imaging
  29. GRB 070721A: optical observations
  30. GRB 070724: optical observations
  31. GRB 070721B: further observations and analysis
  32. GRB 070721B: optical observations and proposed redshift
  33. Swift/UVOT observations of GRB070721B optical afterglow.
  34. GRB 070721B : Faulkes Telescope South observations
  35. GRB 070721A : Faulkes Telescope South optical limit
  36. GRB 070714B: confirmation of optical afterglow
  37. GRB070714B: Swift-XRT refined analysis
  38. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  39. GRB 070714 ("Bastille"): Optical Pre-Imaging
  40. GRB 070714 : Liverpool Telescope optical counterpart ?
  41. GRB 070704: RTT150 optical observations
  42. GRB 070707: optical afterglow
  43. GRB070704: FAVOR optical observations
  44. GRB 070611: VLT observations
  45. VLA detection of GRB 070612A in C Band
  46. GRB 070628: NIR detection of afterglow
  47. GRB 070628: TAROT La Silla observatory optical observations
  48. GRB 070612A: Allen Telescope Array Observations
  49. OT20050728 was not an optical GRB afterglow
  50. INTEGRAL burst GRB070615: X-ray continued observations
  51. GRB 070616 : WIDGET simultaneous optical observations
  52. GRB 070612A: Second Epoch WSRT Radio Observations
  53. GRB070621: RTT150 optical observations
  54. GRB 070621: VLT optical observations
  55. GRB 070621: Gemini South optical imaging
  56. GRB070621: OPTIMA-Burst optical upper limit
  57. GRB 070621: TAROT Calern observatory optical observations
  58. GRB 070621: ROTSE-III Prompt Optical Limits
  59. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  60. GRB 070612A: TNG optical observations
  61. Swift/UVOT detection of GRB070616 optical afterglow.
  62. GRB070616: Optical Observation by MITSuME Akeno
  63. GRB 070612B: Optical Observation by MITSuME Akeno
  64. GRB070616: Optical Observation by MITSuME Okayama
  65. GRB 070616: Swift XRT refined circular
  66. GRB 070612A: Possible WSRT Radio Detection
  67. GRB 070616: BTA astrometry and finding chart
  68. GRB 070616: BTA optical observations
  69. Swift/UVOT observations of GRB070616
  70. GRB 070612B: optical observations
  71. VLA upper limit on GRB 070610
  72. GRB 070612A: Rapid Decay
  73. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  74. GRB070612A: MITSuME Okayama Observation
  75. GRB 070612A: continued SARA observations
  76. GRB 070612A: MDM Observations
  77. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  78. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  79. GRB 070610: TAROT Calern observatory optical observations
  80. GRB 070610: MITSuME OAO optical upper limit
  81. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  82. GRB 070610: SARA upper limit
  83. GRB 070610: Swift-XRT refined analysis
  84. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  85. GRB 070611: Swift-XRT refined analysis
  86. GRB 070610: Optical observations from OSN
  87. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  88. GRB 070611: ROTSE-III Optical Limits
  89. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  90. GRB 070412: TAROT Calern observatory optical observations
  91. GRB 070411: TAROT Calern observatory optical observations
  92. GRB 070419A, deep LBT photometry and possible supernova detection
  93. GRB070520B: optical observations
  94. GRB070520: optical observation
  95. GRB070518: optical observation
  96. GRB070521: optical observation
  97. Swift/UVOT refined analysis of GRB070531
  98. GRB 070531: Liverpool Telescope Optical Observations
  99. Swift/UVOT refined analysis of GRB070529
  100. GRB 070529: Optical aterglow from MIRO

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