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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"

38442 results found.

  1. GRB 040825B: Optical observations
  2. GRB040827 optical observations
  3. GRB 040827 : Planned XMM-Newton observation
  4. GRB 040827 - Refined position
  5. GRB 040827 - A long GRB detected by INTEGRAL
  6. GRB040825B, BVRcIc field photometry
  7. GRB040825A, BVRcIc field photometry
  8. GCN GRB OBSERBATION REPORT
  9. GRB 040825A,optical observations
  10. Increase of SGR 1806-20 activity
  11. GRB040825B: optical observations
  12. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  13. MASTER: GRB040825a optical observation
  14. MASTER: GRB040825b optical observation
  15. GRB 040825: Optical observations
  16. XRF040812: possible afterglow second Chandra observation
  17. GRB 040812: Second epoch CXO Observations
  18. GRB040823,optical observation
  19. XRF040812: GMRT observations
  20. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  21. XRF 040812: optical observation at VLT
  22. GRB 040812: Optical counterparts of CXO sources
  23. XRF040812: possible afterglow
  24. CXO observation of GRB 040812
  25. IPN/HETE localizations of GRB040810 (=H3489)
  26. GRB 040812: Keck and LCO optical observations
  27. GRB 040812: Keck and LCO observations
  28. GRB 040812: radio observations
  29. GRB040812, optical/IR observations
  30. Konus-Wind observation of GRB040810 (=H3489)
  31. GRB 040812: a long GRB detected by INTEGRAL
  32. XRF040701: Optical Observations at ESO
  33. IPN/HETE triangulation of GRB040802 (=H3485)
  34. GRB 040730, infrared observations
  35. GRB 040730: Optical observations
  36. GRB 040730: a long GRB detected with INTEGRAL
  37. Ongoing activity of SGR 1806-20
  38. GRB040624: optical monitoring at TNG
  39. XRF 040701 - optical observations of the decaying Chandra source
  40. XRF040701: Second-Epoch Chandra Observations
  41. Cancellation of IBAS/INTEGRAL GRB alerts
  42. XRF040701: VLA Observations
  43. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  44. XRF040701: First-Epoch Chandra Observations
  45. IBAS Alert 1836: NOT a real GRB
  46. GRB040709 J,H-band observations
  47. GRB040624, optical observations
  48. GRB040706:observation at University of Miyazaki
  49. XRF 040701, optical observations
  50. XRF040701 (=U11548): a bright XRF detected by HETE
  51. Optical Observations of GRB040624
  52. GRB 040624: optical observations at TNG and VLT
  53. MASTER: GRB 040624 optical observation after 0,48d
  54. GRB 040624: R-band observations
  55. GRB 040624, optical observations
  56. GRB 040624 - A long GRB detected with INTEGRAL
  57. GRB 030329: Rebrightening of hyperluminal ejecta.
  58. IPN Summary of SGR1806-20 Activity in 2004
  59. GRB040511: Retraction of redshift identification
  60. SGR 1806-20: no IR variability of the proposed counterparts
  61. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  62. SGR 1806-20, potential NIR counterpart
  63. GRB 040606: Optical observations
  64. Activivty of SGR 1806-20
  65. IPN triangulation of an intense intermediate burst from SGR1806-20
  66. GRB 040511, very fast decay?
  67. GRB 030324: Detection and Color of Host Galaxy
  68. GRB 040511: NIR observations with REM
  69. GRB040511: Redshift identifcation
  70. GRB040511: Candidate optical/NIR afterglow
  71. IBAS GRB Alerts n.1785 to 1791
  72. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  73. GRB 040511: Second Epoch Optical Observations
  74. IBAS GRB Alerts 1781-4
  75. GRB 040511: Optical observations
  76. GRB 040511: Optical Observations
  77. GRB040511: Optical Observations
  78. GRB040511: Optical Observations
  79. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  80. IBAS GRB Alert number 1774: NOT a real GRB
  81. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  82. IBAS Alerts 1771 and 1772: NOT a real GRB
  83. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  84. IPN triangulation of GRB040425 (=H3183)
  85. On Line Availability of Archival HETE Fregate Data and Lightcurves
  86. GRB 040423 (=H3175): A Long GRB Localized by HETE
  87. GRB040422, optical observations at Loiano
  88. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  89. GRB040422, BVRcIc field calibration
  90. GRB 040422,optical observation
  91. GRB040422: optical and NIR observations at the VLT
  92. GRB 040422: a long GRB detected with INTEGRAL
  93. GRB 040403, deep optical observations
  94. INTEGRAL-SPI/ACS GRB data: timing correction
  95. IBAS GRB alerts 1739, 1740, 1741
  96. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  97. GRB 040403 Optical Observations
  98. GRB 040403: Optical observations
  99. GRB 040403: Optical Observations
  100. GRB 040403: a long GRB detected with INTEGRAL

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