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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"

37704 results found.

  1. GRB 040924: detection of possible host galaxy by Subaru
  2. GRB040924, RTT150 optical observation
  3. GRB040924: KAIT observations
  4. GRB040924: Afterglow magnitude at t=17.5hr
  5. GRB 040924: WSRT Radio Observations
  6. GRB 040924: NIR finding chart
  7. GRB040924 : Optical candidate observations at Lulin observatory
  8. GRB040924 : Optical candidate observations at Lulin observatory
  9. GRB 040924: Subaru NIR observation
  10. GRB 040924: RTT150 optical observations
  11. GRB 040924, optical follow-up
  12. IPN triangulation of GRB040924 (H3564)
  13. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  14. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  15. XRF040916: continuing decay of OT
  16. TAROT Observations of GRB 040916 (HETE #3558)
  17. XRF040916, optical observations
  18. XRF040916: Optical Transient Candidate by Subaru
  19. GRB040916 optical limits 17 min after GRB
  20. XRF 040912 (=H3557): Spectral and Temporal Properties
  21. XRF040916, Ic observations
  22. XRF040912, BVRcIc field calibration
  23. XRF040916, BVRcIc field calibration
  24. GRB040916: Archival optical observations
  25. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  26. GRB040916: Optical observations
  27. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  28. GRB040912 (= H3557): Chandra Observations Scheduled
  29. GRB 040912: Optical Observations
  30. GRB/XRF040912,optical observations
  31. GRB 040912, BVRI observations
  32. Optical observations of GRB/XRF 040912 = HETE 3557
  33. An intense burst from SGR1806-20
  34. IBAS GRB Alerts 1978-1980
  35. Optical observations of field of GRB040912
  36. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  37. GRB 040827: XMM-Newton data
  38. GRB040903 - A XRF?
  39. GRB040827: analysis of the XMM-Newton observation
  40. GRB 040903 - INTEGRAL data analysis
  41. IBAS Alert 1974. Not a real GRB
  42. Very bright burst detected from SGR 1806-20
  43. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  44. Possible GRB 040903 - further analysis
  45. Possible GRB 040903 detected with INTEGRAL
  46. GRB 040827 - Radio Observations
  47. XMM-Newton Images of GRB 040827
  48. GRB 040827: optical and NIR observations at the VLT
  49. GRB 040827: UKIRT - 2nd epoch K-band imaging
  50. GRB 040827: 2nd epoch of Magellan K-band imaging
  51. GRB 040827: K imaging - no evidence of variability
  52. GRB 040827: Detection of NIR afterglow
  53. GRB 040827: Possible detection of optical afterglow
  54. GRB 040827: RTT150 optical observations
  55. GRB040825A: optical limit before GRB
  56. GRB 040825B: Optical observations
  57. GRB040827 optical observations
  58. GRB 040827 : Planned XMM-Newton observation
  59. GRB 040827 - Refined position
  60. GRB 040827 : peak flux
  61. GRB 040827 - A long GRB detected by INTEGRAL
  62. GRB040825B, BVRcIc field photometry
  63. GRB040825A, BVRcIc field photometry
  64. GCN GRB OBSERBATION REPORT
  65. GRB 040825A,optical observations
  66. Increase of SGR 1806-20 activity
  67. GRB 040825A: Optical observations.
  68. GRB040825B: Correction to GCN 2657
  69. GRB 040825: Optical observations
  70. GRB 040812: Second epoch CXO Observations
  71. GRB040823,optical observation
  72. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  73. XRF 040812: optical observation at VLT
  74. GRB 040812: Optical counterparts of CXO sources
  75. XRF040812: possible afterglow
  76. CXO observation of GRB 040812
  77. IPN/HETE localizations of GRB040810 (=H3489)
  78. GRB 040812: Keck and LCO optical observations
  79. GRB 040812: Keck and LCO observations
  80. GRB 040812: radio observations
  81. GRB040812, optical/IR observations
  82. Konus-Wind observation of GRB040810 (=H3489)
  83. GRB 040812: a long GRB detected by INTEGRAL
  84. GRB 040810: Optical observations of a limited region
  85. IPN/HETE triangulation of GRB040802 (=H3485)
  86. GRB 040730, infrared observations
  87. GRB 040730: Optical observations
  88. GRB 040730: a long GRB detected with INTEGRAL
  89. Ongoing activity of SGR 1806-20
  90. GRB040624: optical monitoring at TNG
  91. Cancellation of IBAS/INTEGRAL GRB alerts
  92. IBAS Alert 1836: NOT a real GRB
  93. GRB040709 J,H-band observations
  94. GRB 040624: optical observations
  95. GRB 040624: optical observations at TNG and VLT
  96. MASTER: GRB 040624 optical observation after 0,48d
  97. GRB 040624: R-band observations
  98. GRB 040624, optical observations
  99. GRB 040624 - A long GRB detected with INTEGRAL
  100. GRB 030329: Rebrightening of hyperluminal ejecta.

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