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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"

37171 results found.

  1. IPN triangulation of GRB040924 (H3564)
  2. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  3. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  4. XRF040916: continuing decay of OT
  5. TAROT Observations of GRB 040916 (HETE #3558)
  6. XRF040916, optical observations
  7. XRF040916: Optical Transient Candidate by Subaru
  8. GRB040916 optical limits 17 min after GRB
  9. XRF 040912 (=H3557): Spectral and Temporal Properties
  10. XRF040916, Ic observations
  11. XRF040912, BVRcIc field calibration
  12. XRF040916, BVRcIc field calibration
  13. GRB040916: Archival optical observations
  14. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  15. GRB040916: Optical observations
  16. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  17. GRB040912 (= H3557): Chandra Observations Scheduled
  18. GRB 040912: Optical Observations
  19. GRB/XRF040912,optical observations
  20. GRB 040912, BVRI observations
  21. Optical observations of GRB/XRF 040912 = HETE 3557
  22. An intense burst from SGR1806-20
  23. IBAS GRB Alerts 1978-1980
  24. Optical observations of field of GRB040912
  25. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  26. GRB 040827: XMM-Newton data
  27. GRB040903 - A XRF?
  28. GRB040827: analysis of the XMM-Newton observation
  29. GRB040903, REM near-IR observation
  30. GRB 040903 - INTEGRAL data analysis
  31. IBAS Alert 1974. Not a real GRB
  32. Very bright burst detected from SGR 1806-20
  33. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  34. Possible GRB 040903 - further analysis
  35. Possible GRB 040903 detected with INTEGRAL
  36. GRB 040827 - Radio Observations
  37. XMM-Newton Images of GRB 040827
  38. GRB 040827: optical and NIR observations at the VLT
  39. GRB 040827: UKIRT - 2nd epoch K-band imaging
  40. GRB 040827: 2nd epoch of Magellan K-band imaging
  41. GRB 040827: K imaging - no evidence of variability
  42. GRB 040827: Detection of NIR afterglow
  43. GRB 040827: Possible detection of optical afterglow
  44. GRB 040827: RTT150 optical observations
  45. GRB040825A: optical limit before GRB
  46. MASTER: GRB040827 possible OT
  47. GRB 040825B: Optical observations
  48. GRB040827 optical observations
  49. GRB 040827 : Planned XMM-Newton observation
  50. GRB 040827 - Refined position
  51. GRB 040827 : peak flux
  52. GRB 040827 - A long GRB detected by INTEGRAL
  53. GRB040825B, BVRcIc field photometry
  54. GRB040825A, BVRcIc field photometry
  55. GCN GRB OBSERBATION REPORT
  56. GRB 040825A,optical observations
  57. Increase of SGR 1806-20 activity
  58. GRB 040825A: Optical observations.
  59. MASTER: GRB040825b optical observation
  60. GRB040825B: Correction to GCN 2657
  61. GRB 040825: Optical observations
  62. XRF040812: possible afterglow second Chandra observation
  63. GRB 040812: Second epoch CXO Observations
  64. GRB040823,optical observation
  65. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  66. XRF 040812: optical observation at VLT
  67. GRB 040812: Optical counterparts of CXO sources
  68. XRF040812: possible afterglow
  69. CXO observation of GRB 040812
  70. IPN/HETE localizations of GRB040810 (=H3489)
  71. GRB 040812: Keck and LCO optical observations
  72. GRB 040812: Keck and LCO observations
  73. GRB 040812: radio observations
  74. GRB040812, optical/IR observations
  75. Konus-Wind observation of GRB040810 (=H3489)
  76. GRB 040812: a long GRB detected by INTEGRAL
  77. GRB 040810: Optical observations of a limited region
  78. IPN/HETE triangulation of GRB040802 (=H3485)
  79. GRB 040730, infrared observations
  80. GRB 040730: Optical observations
  81. GRB 040730: a long GRB detected with INTEGRAL
  82. Ongoing activity of SGR 1806-20
  83. GRB040624: optical monitoring at TNG
  84. XRF 040701 - optical observations of the decaying Chandra source
  85. XRF040701: Second-Epoch Chandra Observations
  86. Cancellation of IBAS/INTEGRAL GRB alerts
  87. XRF040701: First-Epoch Chandra Observations
  88. IBAS Alert 1836: NOT a real GRB
  89. GRB040709 J,H-band observations
  90. XRF 040701, optical observations
  91. GRB 040624: optical observations
  92. Optical Observations of GRB040624
  93. GRB 040624: optical observations at TNG and VLT
  94. MASTER: GRB 040624 optical observation after 0,48d
  95. GRB 040624: R-band observations
  96. GRB 040624, optical observations
  97. GRB 040624 - A long GRB detected with INTEGRAL
  98. GRB 030329: Rebrightening of hyperluminal ejecta.
  99. IPN Summary of SGR1806-20 Activity in 2004
  100. GRB040511: Retraction of redshift identification

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