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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"

32721 results found.

  1. GRB041219, BVRcIc field calibration
  2. GRB 041219: Infrared Afterglow Candidate
  3. GRB041218, BVRcIc field calibration
  4. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  5. GRB 041217: PROMPT Observations
  6. GRB041218: optical observations
  7. GRB041217: optical limit 30 min after GRB
  8. GRB 041218; optical candidate
  9. GRB 041218: Optical observations
  10. GRB 041217: LCO40 Optical Observations and Possible Candidates
  11. GRB041217: Optical Observations
  12. GRB041217: NIR and optical observations with REM
  13. GRB041217: Infrared Observations
  14. GRB041217: The First GRB Located On-Board Swift
  15. GRB041211: Faulkes Telescope continued optical monitoring
  16. Optical Transient in Lynx not a GRB
  17. Optical transient (GRB?) in Lynx
  18. GRB041211: Continued P60 Observations
  19. GRB041211, Faulkes Telescope optical observation
  20. GRB041211, BVRcIc field calibration
  21. GRB 041211: Infrared Observations
  22. GRB 041211: Optical follow-up in East Asian region
  23. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  24. GRB041015: Near-Infrared observations
  25. GRB 040924: Afterglow Color
  26. GRB 041006: GETS Optical Afterglow Observation
  27. Summary of the recent bursts from SGR 1806-20
  28. GRB 041006: Optical Observations
  29. GRB041006, late-time optical photometry
  30. GRB041006: RTT150 Optical Observations
  31. GRB041015 : Multi epoch optical observations
  32. GRB041006: RTT150 Optical Observations
  33. GRB 041016: Optical limits
  34. GRB 041015: Optical Observations at Rikubetsu
  35. GRB041006: Near Infrared observations
  36. GRB040924, BVRcIc field calibration
  37. GRB 041015: Optical limit at Osaka University
  38. GRB041015 : Optical follow-up at Kiso
  39. GRB 041006 R observations in Loiano
  40. GRB041006: VLT observations of the afterglow and host galaxy
  41. GRB041006: Optical observations and Potential host galaxy
  42. GRB041006, BVRcIc field calibration
  43. GRB 040924: VLT spectroscopy
  44. GRB 041006: SARA afterglow observations
  45. GRB041006, optical observation in CrAO
  46. Search for SN light in XRF 040912 with MEGACAM
  47. GRB 040916: Afterglow Color at Early Times
  48. GRB 041006 Optical afterglow observations
  49. GRB 041006: BR observations with VATT
  50. GRB 041006: Redshift confirmed
  51. GRB041006: Liverpool Telescope optical observations
  52. GRB 041006: Colour measurement
  53. GRB041006: break in the light curve
  54. GRB 041006: Radio Observations
  55. GRB 041006 : optical follow-up observation at Lulin Observatory
  56. GRB 041006 : Optical follow-up observation at TAROT
  57. GRB041006: Optical photometry and spectroscopy at TNG
  58. GRB 041006: presice astrometry
  59. GRB041006 (= H3570): Chandra Observations In Progress
  60. GRB 041006 : optical observation at Bisei
  61. GRB041006, optical I observation
  62. GRB041006 (=HETE3570): optical observations
  63. ROTSE-IIIa Observations of GRB 041006
  64. GRB041006, optical observation
  65. GRB041006, submillimetre observations
  66. GRB041006: MASTER optical observations
  67. GRB 041006: Optical decay
  68. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  69. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  70. GRB041006: Fading of optical afterglow candidate
  71. GRB 041006 : Optical follow-up observation at KISO
  72. GRB 041006: Finding chart
  73. GRB 041006: Optical afterglow candidate
  74. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  75. XRF 020903: Observations of the Host Galaxy (authors)
  76. XRF 020903: Observations of the Host Galaxy
  77. GRB 040924: Second Epoch WSRT Radio Observations
  78. radio observations, GRB 040924
  79. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  80. GRB040924,optical observation
  81. GRB040924, RTT150 optical observation
  82. GRB040924,optical observation
  83. GRB 040924: detection of possible host galaxy by Subaru
  84. GRB040924, RTT150 optical observation
  85. GRB040924: KAIT observations
  86. GRB040924: Afterglow magnitude at t=17.5hr
  87. GRB 040924: WSRT Radio Observations
  88. GRB 040924: NIR finding chart
  89. GRB040924 : Optical candidate observations at Lulin observatory
  90. GRB040924 : Optical candidate observations at Lulin observatory
  91. GRB 040924: Subaru NIR observation
  92. GRB 040924: RTT150 optical observations
  93. GRB 040924, optical follow-up
  94. GRB040924: MASTER: OT decay
  95. IPN triangulation of GRB040924 (H3564)
  96. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  97. XRF 040912: Radio Observations
  98. XRF 040916: Radio Observations
  99. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  100. XRF040916: continuing decay of OT

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