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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"

28117 results found.

  1. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  2. Possible GRB 040903 - further analysis
  3. GRB 040827 - Radio Observations
  4. XMM-Newton Images of GRB 040827
  5. GRB 040827: optical and NIR observations at the VLT
  6. GRB 040827: UKIRT - 2nd epoch K-band imaging
  7. GRB 040827: 2nd epoch of Magellan K-band imaging
  8. GRB 040827: K imaging - no evidence of variability
  9. GRB 040827: Detection of NIR afterglow
  10. GRB040827 XMM-Newton observation
  11. GRB040825A: optical limit before GRB
  12. GRB 040825B: Optical observations
  13. GRB 040827 : Planned XMM-Newton observation
  14. GRB040825B, BVRcIc field photometry
  15. GRB040825A, BVRcIc field photometry
  16. GCN GRB OBSERBATION REPORT
  17. GRB 040825A,optical observations
  18. GRB040825A: optical observations
  19. GRB040825B: optical observations
  20. MASTER: GRB040825b optical observation
  21. GRB 040825: Optical observations
  22. XRF040812: possible afterglow second Chandra observation
  23. GRB 040812: Second epoch CXO Observations
  24. GRB040823,optical observation
  25. XRF040812: GMRT observations
  26. XRF 040812: optical observation at VLT
  27. GRB 040812: Optical counterparts of CXO sources
  28. XRF040812: possible afterglow
  29. CXO observation of GRB 040812
  30. GRB 040812: radio observations
  31. GRB040812, optical/IR observations
  32. GRB 040812: a long GRB detected by INTEGRAL
  33. XRF040701: Optical Observations at ESO
  34. GRB 040730, infrared observations
  35. GRB 040730: a long GRB detected with INTEGRAL
  36. Ongoing activity of SGR 1806-20
  37. GRB040624: optical monitoring at TNG
  38. XRF 040701 - optical observations of the decaying Chandra source
  39. XRF040701: Second-Epoch Chandra Observations
  40. XRF040701: VLA Observations
  41. XRF040701: First-Epoch Chandra Observations
  42. GRB040624, optical observations
  43. GRB040706:observation at University of Miyazaki
  44. Optical Observations of GRB040624
  45. GRB 040624: optical observations at TNG and VLT
  46. MASTER: GRB 040624 optical observation after 0,48d
  47. GRB 040624, optical observations
  48. GRB 040624 - A long GRB detected with INTEGRAL
  49. GRB 030329: Rebrightening of hyperluminal ejecta.
  50. IPN Summary of SGR1806-20 Activity in 2004
  51. SGR 1806-20: no IR variability of the proposed counterparts
  52. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  53. SGR 1806-20, potential NIR counterpart
  54. GRB 040606: Optical observations
  55. MASTER: HETE Alert 3274 optical observation
  56. Activivty of SGR 1806-20
  57. GRB 040511, very fast decay?
  58. GRB 030324: Detection and Color of Host Galaxy
  59. GRB 040511: NIR observations with REM
  60. GRB040511: Candidate optical/NIR afterglow
  61. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  62. GRB 040511: Second Epoch Optical Observations
  63. GRB 040511: Optical observations
  64. GRB 040511: Optical Observations
  65. GRB040511: Optical Observations
  66. GRB040511: Optical Observations
  67. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  68. GRB 040423 (=H3175): A Long GRB Localized by HETE
  69. GRB040422 : I-band follow-up observation at Lulin Observatory
  70. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  71. GRB040422, BVRcIc field calibration
  72. GRB 040422,optical observation
  73. GRB 040422: a long GRB detected with INTEGRAL
  74. GRB 040403, deep optical observations
  75. MASTER: HETE Alert 3163, 3167 technical optical observation
  76. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  77. GRB 040403: Optical observations
  78. GRB 040403: a long GRB detected with INTEGRAL
  79. GRB040323: NIR Observations and Variable Object
  80. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  81. GRB 040323, a dark GRB ?
  82. GRB 040323: a long GRB detected with INTEGRAL
  83. GRB040223: Deep NIR NTT data re-analysis
  84. GRB 040223: XMM-Newton results
  85. GRB040223, improved XMM position
  86. GRB 031203, possible supernova
  87. MASTER: RXTE GRB040308 optical observation
  88. IBAS results on a burst from SGR1806-20
  89. INTEGRAL detection of activity from SGR1806-20
  90. RXTE GRB040229 optical observation: no candidate
  91. GRB 040228 Optical observations
  92. GRB040228 : KISO optical follow-up observation
  93. GRB 040223: Deep NIR NTT observations
  94. GRB 040223 : Optical observation (non-detection)
  95. XMM-Newton Images of GRB 040223
  96. GRB 040223, VLA observations
  97. GRB 040223: REM IJK Observations
  98. GRB 040223 XMM-Newton observation ...
  99. GRB 031203 XMM-Newton observation
  100. GRB 040223: further offline analysis

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