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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"

19257 results found.

  1. SGR 1806-20 still active
  2. GRB 040924: detection of possible host galaxy by Subaru
  3. GRB040924 : Optical candidate observations at Lulin observatory
  4. GRB040924 : Optical candidate observations at Lulin observatory
  5. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  6. XRF 040912: Radio Observations
  7. XRF 040916: Radio Observations
  8. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  9. GRB040912(=H3557): Candidate Optical Afterglow
  10. XRF 040912, identification of CXO sources
  11. XRF 040912 (=H3557): Spectral and Temporal Properties
  12. GRB040916: Archival optical observations
  13. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  14. GRB040912 (= H3557): Chandra Observations Scheduled
  15. GRB 040912, BVRI observations
  16. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  17. GRB040903 - A XRF?
  18. GRB040827: analysis of the XMM-Newton observation
  19. Very bright burst detected from SGR 1806-20
  20. Possible GRB 040903 - further analysis
  21. XMM-Newton Images of GRB 040827
  22. GRB040825A: Optical observations
  23. GRB040825A: Optical observations
  24. GRB 040827: UKIRT - 2nd epoch K-band imaging
  25. GRB 040827: 2nd epoch of Magellan K-band imaging
  26. GRB 040827: K imaging - no evidence of variability
  27. GRB 040827: Detection of NIR afterglow
  28. GRB040825A: optical limit before GRB
  29. Increase of SGR 1806-20 activity
  30. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  31. MASTER: GRB040825b optical observation
  32. GRB 040825: Optical observations
  33. XRF040812: possible afterglow second Chandra observation
  34. GRB 040812: Second epoch CXO Observations
  35. XRF040812: GMRT observations
  36. XRF 040812: optical observation at VLT
  37. GRB 040812: Optical counterparts of CXO sources
  38. XRF040812: possible afterglow
  39. CXO observation of GRB 040812
  40. GRB 040812: radio observations
  41. GRB 040812: a long GRB detected by INTEGRAL
  42. IPN/HETE triangulation of GRB040802 (=H3485)
  43. GRB 040730: a long GRB detected with INTEGRAL
  44. Ongoing activity of SGR 1806-20
  45. XRF040701: Second-Epoch Chandra Observations
  46. XRF040701: VLA Observations
  47. XRF040701: First-Epoch Chandra Observations
  48. XRF040701 (=U11548): a bright XRF detected by HETE
  49. GRB 040624 - A long GRB detected with INTEGRAL
  50. GRB 030329: Rebrightening of hyperluminal ejecta.
  51. IPN Summary of SGR1806-20 Activity in 2004
  52. SGR 1806-20, potential NIR counterpart
  53. Activivty of SGR 1806-20
  54. GRB 030324: Detection and Color of Host Galaxy
  55. GRB040511: Candidate optical/NIR afterglow
  56. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  57. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  58. GRB 040423 (=H3175): A Long GRB Localized by HETE
  59. GRB040422 : I-band follow-up observation at Lulin Observatory
  60. GRB 040422: a long GRB detected with INTEGRAL
  61. MASTER: HETE Alert 3163, 3167 technical optical observation
  62. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  63. GRB 040403: a long GRB detected with INTEGRAL
  64. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  65. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  66. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  67. GRB 040323: a long GRB detected with INTEGRAL
  68. GRB040223: Deep NIR NTT data re-analysis
  69. GRB 040223: XMM-Newton results
  70. GRB040223, improved XMM position
  71. IBAS results on a burst from SGR1806-20
  72. INTEGRAL detection of activity from SGR1806-20
  73. RXTE GRB040229 optical observation: no candidate
  74. GRB 040228 Optical observations
  75. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  76. XMM-Newton Images of GRB 040223
  77. GRB 040223: REM IJK Observations
  78. GRB 040223 XMM-Newton observation ...
  79. GRB 031203 XMM-Newton observation
  80. GRB 040223: further offline analysis
  81. GRB031111, optical observations
  82. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  83. GRB031203: Chandra Observations
  84. GRB040106: refined X-ray transient position
  85. SN 2003dh/GRB030329 late-time optical spectroscopy
  86. GRB040106, likely optical afterglow
  87. GRB 031220: Optical observations of Chandra X-ray sources
  88. GRB040106: optical observations with REM+ROSS
  89. GRB 040106 : peak flux
  90. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  91. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  92. GRB031220: Palomar Observations
  93. GRB031203, improved XMM position
  94. GRB 021203: A Normal GRB viewed far off axis?
  95. GRB 031203: Variable Radio Source
  96. GRB 031203: Magellan spectrum of possible GRB host
  97. GRB 031203: Optical/IR Astrometry
  98. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  99. XMM-Newton Observation of GRB031203
  100. GRB031203: K' Photometry of the likely GRB host

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