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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"

37710 results found.

  1. GRB 040924: Second Epoch WSRT Radio Observations
  2. radio observations, GRB 040924
  3. IBAS Alert 1991. Not a real GRB
  4. GRB040929,optical observation
  5. GRB040924,optical observation
  6. GRB040924, RTT150 optical observation
  7. GRB 040924: detection of possible host galaxy by Subaru
  8. GRB040924, RTT150 optical observation
  9. GRB040924: KAIT observations
  10. GRB040924: Afterglow magnitude at t=17.5hr
  11. GRB 040924: WSRT Radio Observations
  12. GRB 040924: NIR finding chart
  13. GRB040924 : Optical candidate observations at Lulin observatory
  14. GRB040924 : Optical candidate observations at Lulin observatory
  15. GRB 040924: Subaru NIR observation
  16. GRB 040924: RTT150 optical observations
  17. GRB 040924, optical follow-up
  18. IPN triangulation of GRB040924 (H3564)
  19. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  20. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  21. XRF040916: continuing decay of OT
  22. TAROT Observations of GRB 040916 (HETE #3558)
  23. XRF040916, optical observations
  24. XRF040916: Optical Transient Candidate by Subaru
  25. GRB040916 optical limits 17 min after GRB
  26. XRF 040912 (=H3557): Spectral and Temporal Properties
  27. XRF040916, Ic observations
  28. XRF040912, BVRcIc field calibration
  29. XRF040916, BVRcIc field calibration
  30. GRB040916: Archival optical observations
  31. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  32. GRB040916: Optical observations
  33. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  34. GRB040912 (= H3557): Chandra Observations Scheduled
  35. GRB 040912: Optical Observations
  36. GRB/XRF040912,optical observations
  37. GRB 040912, BVRI observations
  38. Optical observations of GRB/XRF 040912 = HETE 3557
  39. An intense burst from SGR1806-20
  40. IBAS GRB Alerts 1978-1980
  41. Optical observations of field of GRB040912
  42. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  43. GRB 040827: XMM-Newton data
  44. GRB040903 - A XRF?
  45. GRB040827: analysis of the XMM-Newton observation
  46. GRB 040903 - INTEGRAL data analysis
  47. IBAS Alert 1974. Not a real GRB
  48. Very bright burst detected from SGR 1806-20
  49. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  50. Possible GRB 040903 - further analysis
  51. Possible GRB 040903 detected with INTEGRAL
  52. GRB 040827 - Radio Observations
  53. XMM-Newton Images of GRB 040827
  54. GRB 040827: optical and NIR observations at the VLT
  55. GRB 040827: UKIRT - 2nd epoch K-band imaging
  56. GRB 040827: 2nd epoch of Magellan K-band imaging
  57. GRB 040827: K imaging - no evidence of variability
  58. GRB 040827: Detection of NIR afterglow
  59. GRB 040827: Possible detection of optical afterglow
  60. GRB 040827: RTT150 optical observations
  61. GRB040825A: optical limit before GRB
  62. GRB 040825B: Optical observations
  63. GRB040827 optical observations
  64. GRB 040827 : Planned XMM-Newton observation
  65. GRB 040827 - Refined position
  66. GRB 040827 : peak flux
  67. GRB 040827 - A long GRB detected by INTEGRAL
  68. GRB040825B, BVRcIc field photometry
  69. GRB040825A, BVRcIc field photometry
  70. GCN GRB OBSERBATION REPORT
  71. GRB 040825A,optical observations
  72. Increase of SGR 1806-20 activity
  73. GRB 040825A: Optical observations.
  74. GRB040825B: Correction to GCN 2657
  75. GRB 040825: Optical observations
  76. GRB 040812: Second epoch CXO Observations
  77. GRB040823,optical observation
  78. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  79. XRF 040812: optical observation at VLT
  80. GRB 040812: Optical counterparts of CXO sources
  81. XRF040812: possible afterglow
  82. CXO observation of GRB 040812
  83. IPN/HETE localizations of GRB040810 (=H3489)
  84. GRB 040812: Keck and LCO optical observations
  85. GRB 040812: Keck and LCO observations
  86. GRB 040812: radio observations
  87. GRB040812, optical/IR observations
  88. Konus-Wind observation of GRB040810 (=H3489)
  89. GRB 040812: a long GRB detected by INTEGRAL
  90. GRB 040810: Optical observations of a limited region
  91. IPN/HETE triangulation of GRB040802 (=H3485)
  92. GRB 040730, infrared observations
  93. GRB 040730: Optical observations
  94. GRB 040730: a long GRB detected with INTEGRAL
  95. Ongoing activity of SGR 1806-20
  96. GRB040624: optical monitoring at TNG
  97. Cancellation of IBAS/INTEGRAL GRB alerts
  98. IBAS Alert 1836: NOT a real GRB
  99. GRB040709 J,H-band observations
  100. GRB 040624: optical observations

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