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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"

44641 results found.

  1. GRB040812, optical/IR observations
  2. Konus-Wind observation of GRB040810 (=H3489)
  3. GRB 040812: a long GRB detected by INTEGRAL
  4. GRB 040810: Optical observations of a limited region
  5. XRF040701: Optical Observations at ESO
  6. IPN/HETE triangulation of GRB040802 (=H3485)
  7. GRB 040730, infrared observations
  8. GRB 040730: Optical observations
  9. GRB 040730: a long GRB detected with INTEGRAL
  10. Ongoing activity of SGR 1806-20
  11. GRB040624: optical monitoring at TNG
  12. XRF 040701 - optical observations of the decaying Chandra source
  13. XRF040701: Second-Epoch Chandra Observations
  14. Cancellation of IBAS/INTEGRAL GRB alerts
  15. XRF040701: VLA Observations
  16. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  17. XRF040701: First-Epoch Chandra Observations
  18. IBAS Alert 1836: NOT a real GRB
  19. GRB040709 J,H-band observations
  20. GRB040624, optical observations
  21. GRB040706:observation at University of Miyazaki
  22. XRF 040701, optical observations
  23. XRF040701 (=U11548): a bright XRF detected by HETE
  24. GRB 040624: optical observations
  25. Optical Observations of GRB040624
  26. GRB 040624: optical observations at TNG and VLT
  27. MASTER: GRB 040624 optical observation after 0,48d
  28. GRB 040624: R-band observations
  29. GRB 040624, optical observations
  30. GRB 040624 - A long GRB detected with INTEGRAL
  31. GRB 030329: Rebrightening of hyperluminal ejecta.
  32. IPN Summary of SGR1806-20 Activity in 2004
  33. GRB040511: Retraction of redshift identification
  34. SGR 1806-20: no IR variability of the proposed counterparts
  35. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  36. SGR 1806-20, potential NIR counterpart
  37. GRB 040606: Optical observations
  38. MASTER: HETE Alert 3274 optical observation
  39. Activivty of SGR 1806-20
  40. IPN triangulation of an intense intermediate burst from SGR1806-20
  41. GRB 040511, very fast decay?
  42. GRB 030324: Detection and Color of Host Galaxy
  43. GRB 040511: NIR observations with REM
  44. GRB040511: Redshift identifcation
  45. GRB 040511: Optical limit
  46. GRB040511: Candidate optical/NIR afterglow
  47. IBAS GRB Alerts n.1785 to 1791
  48. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  49. GRB 040511: Second Epoch Optical Observations
  50. IBAS GRB Alerts 1781-4
  51. GRB 040511: Optical observations
  52. GRB 040511: Optical Observations
  53. GRB040511: Optical Observations
  54. GRB040511: Optical Observations
  55. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  56. IBAS GRB Alert number 1774: NOT a real GRB
  57. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  58. IBAS Alerts 1771 and 1772: NOT a real GRB
  59. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  60. IPN triangulation of GRB040425 (=H3183)
  61. On Line Availability of Archival HETE Fregate Data and Lightcurves
  62. GRB040422: optical observations at Xinglong Observatory
  63. GRB040422: optical observations at CrAO
  64. GRB 040423 (=H3175): A Long GRB Localized by HETE
  65. GRB040422, optical observations at Loiano
  66. GRB040422 : I-band follow-up observation at Lulin Observatory
  67. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  68. GRB040422, BVRcIc field calibration
  69. GRB 040422,optical observation
  70. GRB040422: optical and NIR observations at the VLT
  71. GRB 040422: a long GRB detected with INTEGRAL
  72. GRB 040403, deep optical observations
  73. MASTER: HETE Alert 3163, 3167 technical optical observation
  74. INTEGRAL-SPI/ACS GRB data: timing correction
  75. IBAS GRB alerts 1739, 1740, 1741
  76. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  77. GRB 040403: Optical Observations
  78. GRB 040403 Optical Observations
  79. GRB 040403: Optical observations
  80. GRB 040403: optical observations
  81. GRB 040403: Optical Observations
  82. GRB 040403: a long GRB detected with INTEGRAL
  83. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  84. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  85. IBAS GRB Alert 1694
  86. GRB040323: NIR Observations and Variable Object
  87. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  88. GRB 040323, a dark GRB ?
  89. short hard GRB 040322
  90. GRB 040323: a long GRB detected with INTEGRAL
  91. IBAS GRB alerts 1679, 1680, 1681
  92. GRB040223: Deep NIR NTT data re-analysis
  93. GRB 040223: XMM-Newton results
  94. GRB040223, improved XMM position
  95. IBAS Alert 1678: not a GRB
  96. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  97. GRB 031203, possible supernova
  98. MASTER: RXTE GRB040308 optical observation
  99. IBAS results on a burst from SGR1806-20
  100. INTEGRAL detection of activity from SGR1806-20

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