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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"

5541 results found.

  1. GRB 120521C redshift estimate
  2. Konus-Wind observation of GRB 120522A
  3. IPN triangulation of GRB 120522A (long/intense)
  4. GRB 120521C: MASTER optical limit
  5. GRB 120514A: GROND upper limits
  6. GRB 120510A: MAXI/GSC detection of a burst
  7. IPN Triangulation of GRB 120427A
  8. Swift detection of 4U 1630-47
  9. IPN Triangulation of bright GRB 120426A
  10. GRB 120422A: MITSuME Ishigakijima upper limit
  11. GRB 120422A: Swift detection of a burst
  12. GRB 120404A: optical observations in Mondy observatory
  13. GRB 120404A: MASTER OT observations
  14. GRB 120404A: MITSuME Ishigakijima Optical Observation
  15. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  16. GRB 120403B: Fermi GBM Observation
  17. GRB 120404A: Faulkes Telescope North afterglow confirmation
  18. GRB 120403A: MASTER follow up observations
  19. GRB 120402A: MASTER follow up observations
  20. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  21. GRB 120326A: Cima Rest and Bassano Brescia
  22. GRB 120326A: HCT optical observations
  23. GRB 120401A: Prompt enhanced Swift-XRT position
  24. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  25. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  26. GRB 120326A: CARMA 3mm detection
  27. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  28. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  29. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  30. Swift trigger 518853: MASTER-ICATE possible OT
  31. long/intense GRB 120328B: MASTER follow up observations
  32. GRB 120326A: Bassano Bresciano Observatory further optical observations
  33. GRB 120327A: MITSuME Ishigakijima Optical Observation
  34. GRB 120326A: MITSuME Ishigakijima Optical Observation
  35. GRB 120328A: Swift detection of a burst
  36. GRB 120326A: PAIRITEL NIR Observations
  37. GRB 120327A: CQUEAN grizY Observation
  38. GRB 120326A: LOAO R-band Observations
  39. GRB 120327A: X-shooter redshift
  40. GROND observations of GRB 120327A
  41. GRB 120327A: Liverpool Telescope Observations
  42. GRB 120326A: optical observation of GMG
  43. GRB 120326A: T17 optical observations
  44. GRB 120326A: CQUEAN grizY Observation
  45. GRB 120323A: MASTER follow up observations
  46. IPN Triangulation of GRB 120323A (short/very intense)
  47. GRB 120324A: CQUEAN rizY Observation
  48. GRB 120320A: MITSuME Okayama Optical upper limits
  49. GRB 120320A , optical observations
  50. GRB 120320A: MASTER optical observations
  51. GRB 120311B: Optical follow-up
  52. GRB 120311A: C88 optical limits
  53. GRB 120312A: MASTER-NET optical observations
  54. GRB 120311B: C88 optical limits
  55. GRB 120311B: MITSuME Okayama Optical upper limits
  56. GRB 120311B: Enhanced Swift-XRT position
  57. GRB 120311B: Swift-XRT observations
  58. GRB 120311B: Swift detection of a burst
  59. GRB 120311A: Swift/UVOT Upper Limits
  60. GRB 120308A : LOAO optical observation
  61. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  62. GRB 120305A: EVLA deep limit on a radio counterpart
  63. GRB 120305A: MASTER-NET early optical observations
  64. GRB 120211A : LOAO optical observations
  65. GRB 120202A: Swift/XRT and UVOT observations
  66. GRB 120119A : LOAO Optical Observations
  67. GRB 120119A: optical upper limit
  68. GRB 120118B: Faulkes Telescope South observations
  69. AXP 4U 1042+61: Mondy optical observations
  70. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  71. Swift detection of an SGR burst from AXP 4U 0142+61
  72. GRB 120106A: Swift-BAT refined analysis
  73. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  74. GRB 111228A: LOAO Optical Observation
  75. GRB111228A: Further GMG observations
  76. GRB111228A: MITSuME Okayama Optical Observation
  77. GRB 111225A: GRT Optical Observation
  78. GRB 111225A: Swift detection of a burst with an optical counterpart
  79. GRB 111222A: Xinglong TNT observation
  80. GRB 111210A: optical upper limit of Mt. Terskol observatory
  81. GRB111215A: optical upper limit
  82. GRB 111211A: NOT afterglow confirmation
  83. GRB 111210A: Swift detection of a burst
  84. GRB 111209A optical limit by "Pi of the Sky"
  85. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  86. GRB 111123A: optical upper limit in CrAO
  87. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  88. GRB 111109A: Swift/UVOT Photometry
  89. GRB 111109A: Swift-XRT observations
  90. GRB 111107A: GROND observations
  91. GRB 111103A: Fermi GBM observation
  92. GRB 111103B: optical observations from TAU, Ka-Dar
  93. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  94. GRB 111103B: optical observations
  95. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  96. Swift-BAT trigger 506884 is not a GRB
  97. GRB 111029A: Faulkes Telescope North observations
  98. GRB 111022A: Swift detection of a burst
  99. GRB 111008A: Gemini optical counterpart
  100. GRB 111005A: Swift detection of a burst

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