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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"
  1. GRB040903 - A XRF?
  2. GRB040827: analysis of the XMM-Newton observation
  3. GRB040903, REM near-IR observation
  4. GRB 040903 - INTEGRAL data analysis
  5. IBAS Alert 1974. Not a real GRB
  6. Very bright burst detected from SGR 1806-20
  7. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  8. Possible GRB 040903 - further analysis
  9. Possible GRB 040903 detected with INTEGRAL
  10. GRB 040827 - Radio Observations
  11. XMM-Newton Images of GRB 040827
  12. GRB040825A: Optical observations
  13. GRB040825A: Optical observations
  14. GRB 040827: optical and NIR observations at the VLT
  15. GRB 040827: UKIRT - 2nd epoch K-band imaging
  16. GRB 040827: 2nd epoch of Magellan K-band imaging
  17. GRB 040827: K imaging - no evidence of variability
  18. GRB 040827: Detection of NIR afterglow
  19. GRB 040827: Possible detection of optical afterglow
  20. GRB 040827: RTT150 optical observations
  21. GRB040827 XMM-Newton observation
  22. GRB040825A: optical limit before GRB
  23. MASTER: GRB040827 possible OT
  24. GRB 040825B: Optical observations
  25. GRB040827 optical observations
  26. GRB 040827 : Planned XMM-Newton observation
  27. GRB 040827 - Refined position
  28. GRB 040827 : peak flux
  29. GRB 040827 - A long GRB detected by INTEGRAL
  30. GRB040825B, BVRcIc field photometry
  31. GRB040825A, BVRcIc field photometry
  32. GCN GRB OBSERBATION REPORT
  33. GRB 040825A,optical observations
  34. Increase of SGR 1806-20 activity
  35. GRB040825A: optical observations
  36. GRB040825B: optical observations
  37. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  38. GRB 040825A: Optical observations.
  39. MASTER: GRB040825a optical observation
  40. MASTER: GRB040825b optical observation
  41. GRB040825B: Correction to GCN 2657
  42. GRB 040825: Optical observations
  43. XRF040812: possible afterglow second Chandra observation
  44. GRB 040812: Second epoch CXO Observations
  45. GRB040823,optical observation
  46. XRF040812: GMRT observations
  47. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  48. XRF 040812: optical observation at VLT
  49. GRB 040812: Optical counterparts of CXO sources
  50. XRF040812: possible afterglow
  51. CXO observation of GRB 040812
  52. Bursting activity from SGR 1806-20 detected with IBAS
  53. IPN/HETE localizations of GRB040810 (=H3489)
  54. GRB 040812: Keck and LCO optical observations
  55. GRB 040812: Keck and LCO observations
  56. GRB 040812: radio observations
  57. GRB040812, optical/IR observations
  58. Konus-Wind observation of GRB040810 (=H3489)
  59. GRB 040812: a long GRB detected by INTEGRAL
  60. GRB 040810: Optical observations of a limited region
  61. XRF040701: Optical Observations at ESO
  62. IPN/HETE triangulation of GRB040802 (=H3485)
  63. GRB 040730, infrared observations
  64. GRB 040730: Optical observations
  65. GRB 040730: a long GRB detected with INTEGRAL
  66. Ongoing activity of SGR 1806-20
  67. GRB040624: optical monitoring at TNG
  68. XRF 040701 - optical observations of the decaying Chandra source
  69. XRF040701: Second-Epoch Chandra Observations
  70. Cancellation of IBAS/INTEGRAL GRB alerts
  71. XRF040701: VLA Observations
  72. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  73. XRF040701: First-Epoch Chandra Observations
  74. IBAS Alert 1836: NOT a real GRB
  75. GRB040709 J,H-band observations
  76. Subject: GRB040624, optical observations
  77. GRB040706:observation at University of Miyazaki
  78. XRF 040701, optical observations
  79. XRF040701 (=U11548): a bright XRF detected by HETE
  80. GRB 040624: optical observations
  81. Optical Observations of GRB040624
  82. GRB 040624: optical observations at TNG and VLT
  83. MASTER: GRB 040624 optical observation after 0,48d
  84. GRB 040624: R-band observations
  85. GRB 040624, optical observations
  86. GRB 040624 - A long GRB detected with INTEGRAL
  87. GRB 030329: Rebrightening of hyperluminal ejecta.
  88. IPN Summary of SGR1806-20 Activity in 2004
  89. GRB040511: Retraction of redshift identification
  90. SGR 1806-20: no IR variability of the proposed counterparts
  91. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  92. SGR 1806-20, potential NIR counterpart
  93. GRB 040606: Optical observations
  94. MASTER: HETE Alert 3274 optical observation
  95. Activivty of SGR 1806-20
  96. IPN triangulation of an intense intermediate burst from SGR1806-20
  97. GRB 040511, very fast decay?
  98. GRB 030324: Detection and Color of Host Galaxy
  99. GRB 040511: NIR observations with REM
  100. GRB040511: Redshift identifcation

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