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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"

26367 results found.

  1. GRB041016,optical observation
  2. GRB 041016:Optical limit during first minute
  3. GRB041015,optical observation
  4. GRB041006: Fading X-ray Afterglow Observed with Chandra
  5. GRB 041015 - A long GRB detected by INTEGRAL
  6. GRB 041006 R observations in Loiano
  7. GRB041006: VLT observations of the afterglow and host galaxy
  8. GRB041006: Optical observations and Potential host galaxy
  9. GRB041006, BVRcIc field calibration
  10. GRB 041006: SARA afterglow observations
  11. GRB041006, optical observation in CrAO
  12. Search for SN light in XRF 040912 with MEGACAM
  13. GRB 041006 Optical afterglow observations
  14. GRB 041006: BR observations with VATT
  15. GRB 041006: Redshift confirmed
  16. GRB041006: Liverpool Telescope optical observations
  17. GRB 041006 : optical follow-up observation at Lulin Observatory
  18. GRB 041006 : Optical follow-up observation at TAROT
  19. GRB041006: Optical photometry and spectroscopy at TNG
  20. GRB 041006: presice astrometry
  21. GRB041006 (= H3570): Chandra Observations In Progress
  22. GRB041006, optical I observation
  23. GRB041006 (=HETE3570): optical observations
  24. ROTSE-IIIa Observations of GRB 041006
  25. GRB041006, optical observation
  26. GRB041006,optical observation
  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. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  32. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  33. SGR 1806-20 still active
  34. GRB040929,optical observation
  35. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  36. GRB040924,optical observation
  37. GRB040924, RTT150 optical observation
  38. GRB040924,optical observation
  39. GRB 040924: detection of possible host galaxy by Subaru
  40. GRB040924, RTT150 optical observation
  41. GRB040924: KAIT observations
  42. GRB040924: Afterglow magnitude at t=17.5hr
  43. GRB040924 : Optical candidate observations at Lulin observatory
  44. GRB040924 : Optical candidate observations at Lulin observatory
  45. GRB040924: Optical afterglow properties
  46. GRB 040924: RTT150 optical observations
  47. GRB 040924, optical follow-up
  48. GRB040924: MASTER: OT decay
  49. IPN triangulation of GRB040924 (H3564)
  50. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  51. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  52. XRF040916: continuing decay of OT
  53. TAROT Observations of GRB 040916 (HETE #3558)
  54. GRB040912(=H3557): Candidate Optical Afterglow
  55. XRF040916, optical observations
  56. XRF040916: Optical Transient Candidate by Subaru
  57. GRB040916 optical limits 17 min after GRB
  58. XRF 040912, identification of CXO sources
  59. XRF 040912 (=H3557): Spectral and Temporal Properties
  60. XRF040916, Ic observations
  61. XRF040916: optical follow-up observations
  62. GRB040916: Archival optical observations
  63. XRF 040916, optical follow-up
  64. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  65. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  66. GRB040916 (= H3558): Improved Localization from HETE WXM
  67. GRB040916 (= H3558): A Long XRF Localized by HETE
  68. GRB040912 (= H3557): Chandra Observations Scheduled
  69. An intense burst from SGR1806-20
  70. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  71. GRB040903 - A XRF?
  72. GRB040827: analysis of the XMM-Newton observation
  73. Very bright burst detected from SGR 1806-20
  74. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  75. GRB 040827: optical and NIR observations at the VLT
  76. GRB 040827: UKIRT - 2nd epoch K-band imaging
  77. GRB 040827: 2nd epoch of Magellan K-band imaging
  78. GRB 040827: K imaging - no evidence of variability
  79. GRB 040827: Detection of NIR afterglow
  80. GRB 040827: RTT150 optical observations
  81. GRB040825A: optical limit before GRB
  82. GRB 040827 - A long GRB detected by INTEGRAL
  83. Increase of SGR 1806-20 activity
  84. GRB040825A: optical observations
  85. GRB040825B: optical observations
  86. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  87. GRB 040825A: Optical observations.
  88. GRB 040812: Second epoch CXO Observations
  89. GRB040823,optical observation
  90. XRF040812: GMRT observations
  91. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  92. XRF040812: possible afterglow
  93. CXO observation of GRB 040812
  94. IPN/HETE localizations of GRB040810 (=H3489)
  95. GRB 040812: Keck and LCO optical observations
  96. GRB 040812: Keck and LCO observations
  97. Konus-Wind observation of GRB040810 (=H3489)
  98. GRB 040812: a long GRB detected by INTEGRAL
  99. GRB 040730: Optical observations
  100. Ongoing activity of SGR 1806-20

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