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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"

19258 results found.

  1. XRF 020903: Observations of the Host Galaxy
  2. SGR 1806-20 still active
  3. GRB 040924: detection of possible host galaxy by Subaru
  4. GRB040924 : Optical candidate observations at Lulin observatory
  5. GRB040924 : Optical candidate observations at Lulin observatory
  6. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  7. XRF 040912: Radio Observations
  8. XRF 040916: Radio Observations
  9. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  10. GRB040912(=H3557): Candidate Optical Afterglow
  11. XRF 040912, identification of CXO sources
  12. XRF 040912 (=H3557): Spectral and Temporal Properties
  13. GRB040916: Archival optical observations
  14. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  15. GRB040912 (= H3557): Chandra Observations Scheduled
  16. GRB 040912, BVRI observations
  17. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  18. GRB040903 - A XRF?
  19. GRB040827: analysis of the XMM-Newton observation
  20. Very bright burst detected from SGR 1806-20
  21. Possible GRB 040903 - further analysis
  22. XMM-Newton Images of GRB 040827
  23. GRB040825A: Optical observations
  24. GRB040825A: Optical observations
  25. GRB 040827: UKIRT - 2nd epoch K-band imaging
  26. GRB 040827: 2nd epoch of Magellan K-band imaging
  27. GRB 040827: K imaging - no evidence of variability
  28. GRB 040827: Detection of NIR afterglow
  29. GRB040825A: optical limit before GRB
  30. Increase of SGR 1806-20 activity
  31. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  32. MASTER: GRB040825b optical observation
  33. GRB 040825: Optical observations
  34. XRF040812: possible afterglow second Chandra observation
  35. GRB 040812: Second epoch CXO Observations
  36. XRF040812: GMRT observations
  37. XRF 040812: optical observation at VLT
  38. GRB 040812: Optical counterparts of CXO sources
  39. XRF040812: possible afterglow
  40. CXO observation of GRB 040812
  41. GRB 040812: radio observations
  42. GRB 040812: a long GRB detected by INTEGRAL
  43. IPN/HETE triangulation of GRB040802 (=H3485)
  44. GRB 040730: a long GRB detected with INTEGRAL
  45. Ongoing activity of SGR 1806-20
  46. XRF040701: Second-Epoch Chandra Observations
  47. XRF040701: VLA Observations
  48. XRF040701: First-Epoch Chandra Observations
  49. XRF040701 (=U11548): a bright XRF detected by HETE
  50. GRB 040624 - A long GRB detected with INTEGRAL
  51. GRB 030329: Rebrightening of hyperluminal ejecta.
  52. IPN Summary of SGR1806-20 Activity in 2004
  53. SGR 1806-20, potential NIR counterpart
  54. Activivty of SGR 1806-20
  55. GRB 030324: Detection and Color of Host Galaxy
  56. GRB040511: Candidate optical/NIR afterglow
  57. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  58. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  59. GRB 040423 (=H3175): A Long GRB Localized by HETE
  60. GRB040422 : I-band follow-up observation at Lulin Observatory
  61. GRB 040422: a long GRB detected with INTEGRAL
  62. MASTER: HETE Alert 3163, 3167 technical optical observation
  63. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  64. GRB 040403: a long GRB detected with INTEGRAL
  65. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  66. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  67. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  68. GRB 040323: a long GRB detected with INTEGRAL
  69. GRB040223: Deep NIR NTT data re-analysis
  70. GRB 040223: XMM-Newton results
  71. GRB040223, improved XMM position
  72. IBAS results on a burst from SGR1806-20
  73. INTEGRAL detection of activity from SGR1806-20
  74. RXTE GRB040229 optical observation: no candidate
  75. GRB 040228 Optical observations
  76. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  77. XMM-Newton Images of GRB 040223
  78. GRB 040223: REM IJK Observations
  79. GRB 040223 XMM-Newton observation ...
  80. GRB 031203 XMM-Newton observation
  81. GRB 040223: further offline analysis
  82. GRB031111, optical observations
  83. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  84. GRB031203: Chandra Observations
  85. GRB040106: refined X-ray transient position
  86. SN 2003dh/GRB030329 late-time optical spectroscopy
  87. GRB040106, likely optical afterglow
  88. GRB 031220: Optical observations of Chandra X-ray sources
  89. GRB040106: optical observations with REM+ROSS
  90. GRB 040106 : peak flux
  91. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  92. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  93. GRB031220: Palomar Observations
  94. GRB031203, improved XMM position
  95. GRB 021203: A Normal GRB viewed far off axis?
  96. GRB 031203: Variable Radio Source
  97. GRB 031203: Magellan spectrum of possible GRB host
  98. GRB 031203: Optical/IR Astrometry
  99. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  100. XMM-Newton Observation of GRB031203

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