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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"

36206 results found.

  1. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  2. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  3. XRF040916: continuing decay of OT
  4. TAROT Observations of GRB 040916 (HETE #3558)
  5. XRF040916, optical observations
  6. XRF040916: Optical Transient Candidate by Subaru
  7. GRB040916 optical limits 17 min after GRB
  8. XRF 040912 (=H3557): Spectral and Temporal Properties
  9. XRF040916, Ic observations
  10. XRF040912, BVRcIc field calibration
  11. XRF040916, BVRcIc field calibration
  12. GRB040916: Archival optical observations
  13. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  14. GRB040916: Optical observations
  15. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  16. GRB040912 (= H3557): Chandra Observations Scheduled
  17. GRB 040912: Optical Observations
  18. GRB/XRF040912,optical observations
  19. GRB 040912, BVRI observations
  20. Optical observations of GRB/XRF 040912 = HETE 3557
  21. An intense burst from SGR1806-20
  22. IBAS GRB Alerts 1978-1980
  23. Optical observations of field of GRB040912
  24. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  25. GRB 040827: XMM-Newton data
  26. GRB040903 - A XRF?
  27. GRB040827: analysis of the XMM-Newton observation
  28. GRB 040903 - INTEGRAL data analysis
  29. IBAS Alert 1974. Not a real GRB
  30. Very bright burst detected from SGR 1806-20
  31. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  32. Possible GRB 040903 - further analysis
  33. Possible GRB 040903 detected with INTEGRAL
  34. GRB 040827 - Radio Observations
  35. XMM-Newton Images of GRB 040827
  36. GRB 040827: optical and NIR observations at the VLT
  37. GRB 040827: UKIRT - 2nd epoch K-band imaging
  38. GRB 040827: 2nd epoch of Magellan K-band imaging
  39. GRB 040827: K imaging - no evidence of variability
  40. GRB 040827: Detection of NIR afterglow
  41. GRB 040827: Possible detection of optical afterglow
  42. GRB 040827: RTT150 optical observations
  43. GRB040825A: optical limit before GRB
  44. GRB 040825B: Optical observations
  45. GRB040827 optical observations
  46. GRB 040827 : Planned XMM-Newton observation
  47. GRB 040827 - Refined position
  48. GRB 040827 : peak flux
  49. GRB 040827 - A long GRB detected by INTEGRAL
  50. GRB040825B, BVRcIc field photometry
  51. GRB040825A, BVRcIc field photometry
  52. GCN GRB OBSERBATION REPORT
  53. GRB 040825A,optical observations
  54. Increase of SGR 1806-20 activity
  55. GRB 040825A: Optical observations.
  56. GRB040825B: Correction to GCN 2657
  57. GRB 040825: Optical observations
  58. GRB 040812: Second epoch CXO Observations
  59. GRB040823,optical observation
  60. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  61. XRF 040812: optical observation at VLT
  62. GRB 040812: Optical counterparts of CXO sources
  63. XRF040812: possible afterglow
  64. CXO observation of GRB 040812
  65. IPN/HETE localizations of GRB040810 (=H3489)
  66. GRB 040812: Keck and LCO optical observations
  67. GRB 040812: Keck and LCO observations
  68. GRB 040812: radio observations
  69. GRB040812, optical/IR observations
  70. Konus-Wind observation of GRB040810 (=H3489)
  71. GRB 040812: a long GRB detected by INTEGRAL
  72. GRB 040810: Optical observations of a limited region
  73. XRF040701: Optical Observations at ESO
  74. IPN/HETE triangulation of GRB040802 (=H3485)
  75. GRB 040730, infrared observations
  76. GRB 040730: Optical observations
  77. GRB 040730: a long GRB detected with INTEGRAL
  78. Ongoing activity of SGR 1806-20
  79. GRB040624: optical monitoring at TNG
  80. Cancellation of IBAS/INTEGRAL GRB alerts
  81. IBAS Alert 1836: NOT a real GRB
  82. GRB040709 J,H-band observations
  83. GRB 040624: optical observations
  84. GRB 040624: optical observations at TNG and VLT
  85. MASTER: GRB 040624 optical observation after 0,48d
  86. GRB 040624: R-band observations
  87. GRB 040624, optical observations
  88. GRB 040624 - A long GRB detected with INTEGRAL
  89. GRB 030329: Rebrightening of hyperluminal ejecta.
  90. IPN Summary of SGR1806-20 Activity in 2004
  91. GRB040511: Retraction of redshift identification
  92. SGR 1806-20: no IR variability of the proposed counterparts
  93. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  94. SGR 1806-20, potential NIR counterpart
  95. GRB 040606: Optical observations
  96. MASTER: HETE Alert 3274 optical observation
  97. Activivty of SGR 1806-20
  98. IPN triangulation of an intense intermediate burst from SGR1806-20
  99. GRB 040511, very fast decay?
  100. GRB 030324: Detection and Color of Host Galaxy

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