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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"

45900 results found.

  1. HETE 3557: Optical observations
  2. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  3. GRB 040827: XMM-Newton data
  4. GRB040903 - A XRF?
  5. GRB040827: analysis of the XMM-Newton observation
  6. GRB040903, REM near-IR observation
  7. GRB 040903 - INTEGRAL data analysis
  8. IBAS Alert 1974. Not a real GRB
  9. Very bright burst detected from SGR 1806-20
  10. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  11. Possible GRB 040903 - further analysis
  12. Possible GRB 040903 detected with INTEGRAL
  13. GRB 040827 - Radio Observations
  14. XMM-Newton Images of GRB 040827
  15. GRB040825A: Optical observations
  16. GRB040825A: Optical observations
  17. GRB 040827: optical and NIR observations at the VLT
  18. GRB 040827: UKIRT - 2nd epoch K-band imaging
  19. GRB 040827: 2nd epoch of Magellan K-band imaging
  20. GRB 040827: K imaging - no evidence of variability
  21. GRB 040827: Detection of NIR afterglow
  22. GRB 040827: Possible detection of optical afterglow
  23. GRB 040827: RTT150 optical observations
  24. GRB040827 XMM-Newton observation
  25. GRB040825A: optical limit before GRB
  26. MASTER: GRB040827 possible OT
  27. GRB 040825B: Optical observations
  28. GRB040827 optical observations
  29. GRB 040827 : Planned XMM-Newton observation
  30. GRB 040827 - Refined position
  31. GRB 040827 : peak flux
  32. GRB 040827 - A long GRB detected by INTEGRAL
  33. GRB040825B, BVRcIc field photometry
  34. GRB040825A, BVRcIc field photometry
  35. GCN GRB OBSERBATION REPORT
  36. GRB 040825A,optical observations
  37. Increase of SGR 1806-20 activity
  38. GRB040825A: optical observations
  39. GRB040825B: optical observations
  40. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  41. GRB 040825A: Optical observations.
  42. MASTER: GRB040825a optical observation
  43. MASTER: GRB040825b optical observation
  44. GRB040825B: Correction to GCN 2657
  45. GRB 040825: Optical observations
  46. XRF040812: possible afterglow second Chandra observation
  47. GRB 040812: Second epoch CXO Observations
  48. GRB040823,optical observation
  49. XRF040812: GMRT observations
  50. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  51. XRF 040812: optical observation at VLT
  52. GRB 040812: Optical counterparts of CXO sources
  53. XRF040812: possible afterglow
  54. CXO observation of GRB 040812
  55. Bursting activity from SGR 1806-20 detected with IBAS
  56. IPN/HETE localizations of GRB040810 (=H3489)
  57. GRB 040812: Keck and LCO optical observations
  58. GRB 040812: Keck and LCO observations
  59. GRB 040812: radio observations
  60. GRB040812, optical/IR observations
  61. Konus-Wind observation of GRB040810 (=H3489)
  62. GRB 040812: a long GRB detected by INTEGRAL
  63. GRB 040810: Optical observations of a limited region
  64. XRF040701: Optical Observations at ESO
  65. IPN/HETE triangulation of GRB040802 (=H3485)
  66. GRB 040730, infrared observations
  67. GRB 040730: Optical observations
  68. GRB 040730: a long GRB detected with INTEGRAL
  69. Ongoing activity of SGR 1806-20
  70. GRB040624: optical monitoring at TNG
  71. XRF 040701 - optical observations of the decaying Chandra source
  72. XRF040701: Second-Epoch Chandra Observations
  73. Cancellation of IBAS/INTEGRAL GRB alerts
  74. XRF040701: VLA Observations
  75. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  76. XRF040701: First-Epoch Chandra Observations
  77. IBAS Alert 1836: NOT a real GRB
  78. GRB040709 J,H-band observations
  79. GRB040624, optical observations
  80. GRB040706:observation at University of Miyazaki
  81. XRF 040701, optical observations
  82. XRF040701 (=U11548): a bright XRF detected by HETE
  83. GRB 040624: optical observations
  84. Optical Observations of GRB040624
  85. GRB 040624: optical observations at TNG and VLT
  86. MASTER: GRB 040624 optical observation after 0,48d
  87. GRB 040624: R-band observations
  88. GRB 040624, optical observations
  89. GRB 040624 - A long GRB detected with INTEGRAL
  90. GRB 030329: Rebrightening of hyperluminal ejecta.
  91. IPN Summary of SGR1806-20 Activity in 2004
  92. GRB040511: Retraction of redshift identification
  93. SGR 1806-20: no IR variability of the proposed counterparts
  94. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  95. SGR 1806-20, potential NIR counterpart
  96. GRB 040606: Optical observations
  97. MASTER: HETE Alert 3274 optical observation
  98. Activivty of SGR 1806-20
  99. IPN triangulation of an intense intermediate burst from SGR1806-20
  100. GRB 040511, very fast decay?

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