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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"
  1. Konus-Wind observation of GRB040810 (=H3489)
  2. GRB 040812: a long GRB detected by INTEGRAL
  3. GRB 040810: Optical observations of a limited region
  4. XRF040701: Optical Observations at ESO
  5. IPN/HETE triangulation of GRB040802 (=H3485)
  6. GRB 040730, infrared observations
  7. GRB 040730: Optical observations
  8. GRB 040730: a long GRB detected with INTEGRAL
  9. Ongoing activity of SGR 1806-20
  10. GRB040624: optical monitoring at TNG
  11. XRF 040701 - optical observations of the decaying Chandra source
  12. XRF040701: Second-Epoch Chandra Observations
  13. Cancellation of IBAS/INTEGRAL GRB alerts
  14. XRF040701: VLA Observations
  15. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  16. XRF040701: First-Epoch Chandra Observations
  17. IBAS Alert 1836: NOT a real GRB
  18. GRB040709 J,H-band observations
  19. GRB040624, optical observations
  20. GRB040706:observation at University of Miyazaki
  21. XRF 040701, optical observations
  22. XRF040701 (=U11548): a bright XRF detected by HETE
  23. GRB 040624: optical observations
  24. Optical Observations of GRB040624
  25. GRB 040624: optical observations at TNG and VLT
  26. MASTER: GRB 040624 optical observation after 0,48d
  27. GRB 040624: R-band observations
  28. GRB 040624, optical observations
  29. GRB 040624 - A long GRB detected with INTEGRAL
  30. GRB 030329: Rebrightening of hyperluminal ejecta.
  31. IPN Summary of SGR1806-20 Activity in 2004
  32. GRB040511: Retraction of redshift identification
  33. SGR 1806-20: no IR variability of the proposed counterparts
  34. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  35. SGR 1806-20, potential NIR counterpart
  36. GRB 040606: Optical observations
  37. MASTER: HETE Alert 3274 optical observation
  38. Activivty of SGR 1806-20
  39. IPN triangulation of an intense intermediate burst from SGR1806-20
  40. GRB 040511, very fast decay?
  41. GRB 030324: Detection and Color of Host Galaxy
  42. GRB 040511: NIR observations with REM
  43. GRB040511: Redshift identifcation
  44. GRB 040511: Optical limit
  45. GRB040511: Candidate optical/NIR afterglow
  46. IBAS GRB Alerts n.1785 to 1791
  47. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  48. GRB 040511: Second Epoch Optical Observations
  49. IBAS GRB Alerts 1781-4
  50. GRB 040511: Optical observations
  51. GRB 040511: Optical Observations
  52. GRB040511: Optical Observations
  53. GRB040511: Optical Observations
  54. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  55. IBAS GRB Alert number 1774: NOT a real GRB
  56. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  57. IBAS Alerts 1771 and 1772: NOT a real GRB
  58. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  59. IPN triangulation of GRB040425 (=H3183)
  60. On Line Availability of Archival HETE Fregate Data and Lightcurves
  61. GRB040422: optical observations at Xinglong Observatory
  62. GRB040422: optical observations at CrAO
  63. GRB 040423 (=H3175): A Long GRB Localized by HETE
  64. GRB040422, optical observations at Loiano
  65. GRB040422 : I-band follow-up observation at Lulin Observatory
  66. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  67. GRB040422, BVRcIc field calibration
  68. GRB 040422,optical observation
  69. GRB040422: optical and NIR observations at the VLT
  70. GRB 040422: a long GRB detected with INTEGRAL
  71. GRB 040403, deep optical observations
  72. MASTER: HETE Alert 3163, 3167 technical optical observation
  73. INTEGRAL-SPI/ACS GRB data: timing correction
  74. IBAS GRB alerts 1739, 1740, 1741
  75. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  76. GRB 040403: Optical Observations
  77. GRB 040403 Optical Observations
  78. GRB 040403: Optical observations
  79. GRB 040403: optical observations
  80. GRB 040403: Optical Observations
  81. GRB 040403: a long GRB detected with INTEGRAL
  82. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  83. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  84. IBAS GRB Alert 1694
  85. GRB040323: NIR Observations and Variable Object
  86. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  87. GRB 040323, a dark GRB ?
  88. short hard GRB 040322
  89. GRB 040323: a long GRB detected with INTEGRAL
  90. IBAS GRB alerts 1679, 1680, 1681
  91. GRB040223: Deep NIR NTT data re-analysis
  92. GRB 040223: XMM-Newton results
  93. GRB040223, improved XMM position
  94. IBAS Alert 1678: not a GRB
  95. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  96. GRB 031203, possible supernova
  97. MASTER: RXTE GRB040308 optical observation
  98. IBAS results on a burst from SGR1806-20
  99. INTEGRAL detection of activity from SGR1806-20
  100. RXTE GRB040229 optical observation: no candidate

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