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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"

32580 results found.

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

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