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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"

32574 results found.

  1. GRB 041006 Optical afterglow observations
  2. GRB 041006: BR observations with VATT
  3. GRB 041006: Redshift confirmed
  4. GRB041006: Liverpool Telescope optical observations
  5. GRB 041006: Colour measurement
  6. GRB041006: break in the light curve
  7. GRB 041006: Radio Observations
  8. GRB 041006 : optical follow-up observation at Lulin Observatory
  9. GRB 041006 : Optical follow-up observation at TAROT
  10. GRB041006: Optical photometry and spectroscopy at TNG
  11. GRB 041006: presice astrometry
  12. GRB041006 (= H3570): Chandra Observations In Progress
  13. GRB 041006 : optical observation at Bisei
  14. GRB041006, optical I observation
  15. GRB041006 (=HETE3570): optical observations
  16. ROTSE-IIIa Observations of GRB 041006
  17. GRB041006, optical observation
  18. GRB041006, submillimetre observations
  19. GRB041006: MASTER optical observations
  20. GRB 041006: Optical decay
  21. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  22. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  23. GRB041006: Fading of optical afterglow candidate
  24. GRB 041006 : Optical follow-up observation at KISO
  25. GRB 041006: Finding chart
  26. GRB 041006: Optical afterglow candidate
  27. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  28. XRF 020903: Observations of the Host Galaxy (authors)
  29. XRF 020903: Observations of the Host Galaxy
  30. GRB 040924: Second Epoch WSRT Radio Observations
  31. radio observations, GRB 040924
  32. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  33. GRB040924,optical observation
  34. GRB040924, RTT150 optical observation
  35. GRB040924,optical observation
  36. GRB 040924: detection of possible host galaxy by Subaru
  37. GRB040924, RTT150 optical observation
  38. GRB040924: KAIT observations
  39. GRB040924: Afterglow magnitude at t=17.5hr
  40. GRB 040924: WSRT Radio Observations
  41. GRB 040924: NIR finding chart
  42. GRB040924 : Optical candidate observations at Lulin observatory
  43. GRB040924 : Optical candidate observations at Lulin observatory
  44. GRB 040924: Subaru NIR observation
  45. GRB 040924: RTT150 optical observations
  46. GRB 040924, optical follow-up
  47. GRB040924: MASTER: OT decay
  48. IPN triangulation of GRB040924 (H3564)
  49. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  50. XRF 040912: Radio Observations
  51. XRF 040916: Radio Observations
  52. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  53. XRF040916: continuing decay of OT
  54. TAROT Observations of GRB 040916 (HETE #3558)
  55. GRB040912(=H3557): Candidate Optical Afterglow
  56. XRF040916, optical observations
  57. XRF040916: Optical Transient Candidate by Subaru
  58. XRF 040912, identification of CXO sources
  59. XRF040916, Ic observations
  60. XRF040916: optical follow-up observations
  61. XRF040912, BVRcIc field calibration
  62. XRF040916, BVRcIc field calibration
  63. GRB040916: Archival optical observations
  64. XRF 040916, optical follow-up
  65. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  66. GRB040916: Optical observations
  67. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  68. GRB040916 (= H3558): A Long XRF Localized by HETE
  69. GRB040912 (= H3557): Chandra Observations Scheduled
  70. GRB 040912, BVRI observations
  71. GRB040912 : Kiso Optical follow-up observation
  72. IBAS GRB Alerts 1978-1980
  73. Optical observations of field of GRB040912
  74. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  75. GRB040903 - A XRF?
  76. GRB040827: analysis of the XMM-Newton observation
  77. GRB040903, REM near-IR observation
  78. GRB 040903 - INTEGRAL data analysis
  79. Very bright burst detected from SGR 1806-20
  80. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  81. Possible GRB 040903 - further analysis
  82. GRB 040827 - Radio Observations
  83. XMM-Newton Images of GRB 040827
  84. GRB040825A: Optical observations
  85. GRB040825A: Optical observations
  86. GRB 040827: optical and NIR observations at the VLT
  87. GRB 040827: UKIRT - 2nd epoch K-band imaging
  88. GRB 040827: 2nd epoch of Magellan K-band imaging
  89. GRB 040827: K imaging - no evidence of variability
  90. GRB 040827: Detection of NIR afterglow
  91. GRB 040827: Possible detection of optical afterglow
  92. GRB 040827: RTT150 optical observations
  93. MASTER: GRB040827 possible OT
  94. GRB 040825B: Optical observations
  95. GRB040827 optical observations
  96. GRB 040827 - Refined position
  97. GRB040825B, BVRcIc field photometry
  98. GCN GRB OBSERBATION REPORT
  99. GRB040825B: optical observations
  100. GRB040825B (=H3510): An XRF Localized in Real Time by HETE

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