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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"

20519 results found.

  1. XRF 120118A: early optical limit by "Pi of the Sky"
  2. GRB 120118B: Swift detection of a burst
  3. XRF 120118A: Optical candidate
  4. GRB 120116A: Swift/UVOT Upper Limits
  5. GRB 120116A: Enhanced Swift-XRT position
  6. AXP 4U 1042+61: Mondy optical observations
  7. GRB 120116A: Mondy optical observations
  8. GRB 120116A: WHT optical observations
  9. GRB 120116A: Optical observations at Crni Vrh
  10. GRB 120116A: NOT observations
  11. GRB 120116A: IAC80 I-band observations
  12. GRB 120116A: Bassano Bresciano Observatory optical observations
  13. GRB 120116A: Swift detection of a burst
  14. GRB 111228A: optical observations
  15. GRB 120106A: optical upper limit
  16. Swift detection of an SGR burst from AXP 4U 0142+61
  17. GRB 120106A: Swift/UVOT Upper Limits
  18. GRB 120106A: Bassano Bresciano Observatory optical observations
  19. GRB 120106A: MITSuME Okayama Ks-band upper limit
  20. INTEGRAL Weak trigger #6433: GRT Optical Observation
  21. GRB 120106A: MITSuME Okayama Optical upper limits
  22. GRB 120106A: Enhanced Swift-XRT position
  23. GRB 120106A: TAROT Calern observatory optical observations
  24. GRB 120106A: Swift detection of a burst
  25. GRB 111222A: Second Swift observation
  26. Konus-Wind observation of GRB 120102A
  27. GRB 120102A: Swift-BAT refined analysis
  28. GRB 111228A: optical observations in CrAO
  29. GRB 120102A: Swift/UVOT Detection
  30. GRB 120102A: Enhanced Swift-XRT position
  31. GRB 120102A: Swift detection of a burst with an optical counterpart
  32. GRB 111225A: optical observations in CrAO
  33. GRB 111229A: Swift/UVOT Detection
  34. GRB 111229A: Enhanced Swift-XRT position
  35. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  36. GRB 111229A: Gemini-South Redshift
  37. GRB 111229A: GROND afterglow candidate
  38. GRB 111229A: Swift detection of a burst
  39. GRB 111228A: Liverpool Telescope Observations
  40. GRB 111225A: Lightbuckets Optical Observations
  41. GRB 111228A: P60 Observations
  42. GRB 111228A: T100 observations
  43. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  44. GRB 111228A: GMG optical observation
  45. FERMI GRB111228.45: MASTER observations
  46. GRB 111228A: PAIRITEL NIR Detection
  47. GRB 111228A: TAROT La Silla observatory observations
  48. GRB 111228A: GROND observations
  49. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  50. GRB 111228A: IAC80 BVI-band observations
  51. GRB 111228A: Swift/UVOT Detection
  52. GRB 111228A: Skynet/Dolomiti Optical Observations
  53. GRB 111228A: NOT optical observation
  54. GRB 111228A: optical observations
  55. GRB 111228A: Enhanced Swift-XRT position
  56. GRB 111228A: TAROT Calern observatory. OT decay stopped
  57. GRB 111228A, optical observations
  58. GRB 111228A: Fermi GBM observation
  59. GRB111228A: MITSuME Okayama Optical Observation
  60. GRB 111228A: TAROT Calern observatory. OT seems still bright
  61. GRB 111228A: Possible host galaxy in the SDSS arhive
  62. GRB 111225A, optical observations
  63. GRB 111228A: Swift detection of a burst with an optical counterpart
  64. GRB 111205A: optical observations
  65. GRB 111225A: Swift/UVOT Observations
  66. GRB 111215A: Keck/LRIS Imaging
  67. GRB 111225A: Keck/LRIS Afterglow Photometry
  68. GRB 111225A: PAIRITEL NIR Upper Limits
  69. GRB111225A: MITSuME Okayama optical upper limits
  70. GRB 111225A: GRT Optical Observation
  71. GRB 111225A: 1.23m CAHA optical observations
  72. GRB 111225A: Enhanced Swift-XRT position
  73. GRB 111225A: Super-LOTIS early detection
  74. GRB 111225A: TAROT Calern observatory optical detection
  75. GRB 111225A: TAROT Calern observatory optical observations
  76. GRB 111225A: Swift detection of a burst with an optical counterpart
  77. GRB111222A: GMG optical observation
  78. GRB 111222A: Swift-XRT observations
  79. IPN Triangulation of GRB 111222A (short/hard/intense)
  80. GRB 111210A: optical upper limit of Mt. Terskol observatory
  81. Trigger 510075 is not a GRB
  82. GRB 111103B: optical upper limit
  83. GRB 110820A: optical observations in Maidanak observatory
  84. GRB 111103A: optical upper limit of Mt. Terskol observatory
  85. GRB 111211A: optical ovservations at Mt. Terskol observatory
  86. GRB111215A: optical upper limit
  87. GRB 111215B: Swift/UVOT Upper Limits
  88. GRB 111205A: Confirmation of X-ray Afterglow
  89. GRB111215A: Pre-Outburst Palomar 48 inch Imaging
  90. GRB 111215A: WHT, LT and NOT imaging
  91. GRB 111215A: TNG K-band observations
  92. GRB 111215A: MITSuME Okayama Optical upper limits
  93. GRB 111215A: Swift/UVOT Upper Limits
  94. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  95. GRB 111215A: Enhanced Swift-XRT position
  96. GRB 111215A: OSN I-band observations
  97. GRB 111215A: MASTER-Net optical prompt and follow up observations
  98. GRB 111215A, Optical Observations
  99. GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
  100. GRB 111215A: GMG optical upper limit

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