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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"

32550 results found.

  1. GRB 041006: Finding chart
  2. GRB 041006: Optical afterglow candidate
  3. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  4. XRF 020903: Observations of the Host Galaxy (authors)
  5. XRF 020903: Observations of the Host Galaxy
  6. GRB 040924: Second Epoch WSRT Radio Observations
  7. radio observations, GRB 040924
  8. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  9. GRB040924,optical observation
  10. GRB040924, RTT150 optical observation
  11. GRB040924,optical observation
  12. GRB 040924: detection of possible host galaxy by Subaru
  13. GRB040924, RTT150 optical observation
  14. GRB040924: KAIT observations
  15. GRB040924: Afterglow magnitude at t=17.5hr
  16. GRB 040924: WSRT Radio Observations
  17. GRB 040924: NIR finding chart
  18. GRB040924 : Optical candidate observations at Lulin observatory
  19. GRB040924 : Optical candidate observations at Lulin observatory
  20. GRB 040924: Subaru NIR observation
  21. GRB 040924: RTT150 optical observations
  22. GRB 040924, optical follow-up
  23. GRB040924: MASTER: OT decay
  24. IPN triangulation of GRB040924 (H3564)
  25. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  26. XRF 040912: Radio Observations
  27. XRF 040916: Radio Observations
  28. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  29. XRF040916: continuing decay of OT
  30. TAROT Observations of GRB 040916 (HETE #3558)
  31. GRB040912(=H3557): Candidate Optical Afterglow
  32. XRF040916, optical observations
  33. XRF040916: Optical Transient Candidate by Subaru
  34. XRF 040912, identification of CXO sources
  35. XRF040916, Ic observations
  36. XRF040916: optical follow-up observations
  37. XRF040912, BVRcIc field calibration
  38. XRF040916, BVRcIc field calibration
  39. GRB040916: Archival optical observations
  40. XRF 040916, optical follow-up
  41. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  42. GRB040916: Optical observations
  43. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  44. GRB040916 (= H3558): A Long XRF Localized by HETE
  45. GRB040912 (= H3557): Chandra Observations Scheduled
  46. GRB 040912, BVRI observations
  47. GRB040912 : Kiso Optical follow-up observation
  48. IBAS GRB Alerts 1978-1980
  49. Optical observations of field of GRB040912
  50. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  51. GRB040903 - A XRF?
  52. GRB040827: analysis of the XMM-Newton observation
  53. GRB040903, REM near-IR observation
  54. GRB 040903 - INTEGRAL data analysis
  55. Very bright burst detected from SGR 1806-20
  56. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  57. Possible GRB 040903 - further analysis
  58. GRB 040827 - Radio Observations
  59. XMM-Newton Images of GRB 040827
  60. GRB040825A: Optical observations
  61. GRB040825A: Optical observations
  62. GRB 040827: optical and NIR observations at the VLT
  63. GRB 040827: UKIRT - 2nd epoch K-band imaging
  64. GRB 040827: 2nd epoch of Magellan K-band imaging
  65. GRB 040827: K imaging - no evidence of variability
  66. GRB 040827: Detection of NIR afterglow
  67. GRB 040827: Possible detection of optical afterglow
  68. GRB 040827: RTT150 optical observations
  69. MASTER: GRB040827 possible OT
  70. GRB 040825B: Optical observations
  71. GRB040827 optical observations
  72. GRB 040827 - Refined position
  73. GRB040825B, BVRcIc field photometry
  74. GCN GRB OBSERBATION REPORT
  75. GRB040825B: optical observations
  76. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  77. GRB040825B: Correction to GCN 2657
  78. XRF040812: possible afterglow second Chandra observation
  79. GRB 040812: Second epoch CXO Observations
  80. XRF040812: GMRT observations
  81. XRF 040812: optical observation at VLT
  82. GRB 040812: Optical counterparts of CXO sources
  83. XRF040812: possible afterglow
  84. CXO observation of GRB 040812
  85. IPN/HETE localizations of GRB040810 (=H3489)
  86. GRB 040812: Keck and LCO optical observations
  87. GRB 040812: Keck and LCO observations
  88. GRB 040812: radio observations
  89. GRB040812, optical/IR observations
  90. XRF040701: Optical Observations at ESO
  91. IPN/HETE triangulation of GRB040802 (=H3485)
  92. GRB 040730, infrared observations
  93. GRB 040730: Optical observations
  94. Ongoing activity of SGR 1806-20
  95. GRB040624: optical monitoring at TNG
  96. XRF 040701 - optical observations of the decaying Chandra source
  97. XRF040701: Second-Epoch Chandra Observations
  98. XRF040701: VLA Observations
  99. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  100. XRF040701: First-Epoch Chandra Observations

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